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/* This file is generated, please don't edit it directly.  */
#ifndef KRB5_KRB5_H_INCLUDED
#define KRB5_KRB5_H_INCLUDED
/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* General definitions for Kerberos version 5. */
/*
 * Copyright 1989, 1990, 1995, 2001, 2003, 2007, 2011 by the Massachusetts
 * Institute of Technology.  All Rights Reserved.
 *
 * Export of this software from the United States of America may
 *   require a specific license from the United States Government.
 *   It is the responsibility of any person or organization contemplating
 *   export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 */
/*
 * Copyright (C) 1998 by the FundsXpress, INC.
 *
 * All rights reserved.
 *
 * Export of this software from the United States of America may require
 * a specific license from the United States Government.  It is the
 * responsibility of any person or organization contemplating export to
 * obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of FundsXpress. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  FundsXpress makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef KRB5_GENERAL__
#define KRB5_GENERAL__

/** @defgroup KRB5_H krb5 library API
 * @{
 */

/* By default, do not expose deprecated interfaces. */
#ifndef KRB5_DEPRECATED
#define KRB5_DEPRECATED 0
#endif

#if defined(__MACH__) && defined(__APPLE__)
#       include <TargetConditionals.h>
#    if TARGET_RT_MAC_CFM
#       error "Use KfM 4.0 SDK headers for CFM compilation."
#    endif
#endif

#if defined(_MSDOS) || defined(_WIN32)
#include <win-mac.h>
#endif

#ifndef KRB5_CONFIG__
#ifndef KRB5_CALLCONV
#define KRB5_CALLCONV
#define KRB5_CALLCONV_C
#endif /* !KRB5_CALLCONV */
#endif /* !KRB5_CONFIG__ */

#ifndef KRB5_CALLCONV_WRONG
#define KRB5_CALLCONV_WRONG
#endif

#ifndef THREEPARAMOPEN
#define THREEPARAMOPEN(x,y,z) open(x,y,z)
#endif

#if KRB5_PRIVATE
#ifndef WRITABLEFOPEN
#define WRITABLEFOPEN(x,y) fopen(x,y)
#endif
#endif

#define KRB5_OLD_CRYPTO

#include <stdlib.h>
#include <limits.h>             /* for *_MAX */
#include <stdarg.h>
#include <stdint.h>

#ifndef KRB5INT_BEGIN_DECLS
#if defined(__cplusplus)
#define KRB5INT_BEGIN_DECLS     extern "C" {
#define KRB5INT_END_DECLS       }
#else
#define KRB5INT_BEGIN_DECLS
#define KRB5INT_END_DECLS
#endif
#endif

KRB5INT_BEGIN_DECLS

#if defined(__APPLE__) && (defined(__ppc__) || defined(__ppc64__) || defined(__i386__) || defined(__x86_64__))
#pragma pack(push,2)
#endif

#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= 30203
# define KRB5_ATTR_DEPRECATED __attribute__((deprecated))
#elif defined _WIN32
# define KRB5_ATTR_DEPRECATED __declspec(deprecated)
#else
# define KRB5_ATTR_DEPRECATED
#endif

/* from profile.h */
struct _profile_t;
/* typedef struct _profile_t *profile_t; */

/*
 * begin wordsize.h
 */

/*
 * Word-size related definition.
 */

typedef uint8_t krb5_octet;
typedef int16_t krb5_int16;
typedef uint16_t krb5_ui_2;
typedef int32_t krb5_int32;
typedef uint32_t krb5_ui_4;

#define VALID_INT_BITS    INT_MAX
#define VALID_UINT_BITS   UINT_MAX

#define KRB5_INT32_MAX  2147483647
/* this strange form is necessary since - is a unary operator, not a sign
   indicator */
#define KRB5_INT32_MIN  (-KRB5_INT32_MAX-1)

#define KRB5_INT16_MAX 65535
/* this strange form is necessary since - is a unary operator, not a sign
   indicator */
#define KRB5_INT16_MIN  (-KRB5_INT16_MAX-1)

/*
 * end wordsize.h
 */

/*
 * begin "base-defs.h"
 */

/*
 * Basic definitions for Kerberos V5 library
 */

#ifndef FALSE
#define FALSE   0
#endif
#ifndef TRUE
#define TRUE    1
#endif

typedef unsigned int krb5_boolean;
typedef unsigned int krb5_msgtype;
typedef unsigned int krb5_kvno;

typedef krb5_int32 krb5_addrtype;
typedef krb5_int32 krb5_enctype;
typedef krb5_int32 krb5_cksumtype;
typedef krb5_int32 krb5_authdatatype;
typedef krb5_int32 krb5_keyusage;
typedef krb5_int32 krb5_cryptotype;

typedef krb5_int32      krb5_preauthtype; /* This may change, later on */
typedef krb5_int32      krb5_flags;

/**
 * Represents a timestamp in seconds since the POSIX epoch.  This legacy type
 * is used frequently in the ABI, but cannot represent timestamps after 2038 as
 * a positive number.  Code which uses this type should cast values of it to
 * uint32_t so that negative values are treated as timestamps between 2038 and
 * 2106 on platforms with 64-bit time_t.
 */
typedef krb5_int32      krb5_timestamp;

typedef krb5_int32      krb5_deltat;

/**
 * Used to convey an operation status.  The value 0 indicates success; any
 * other values are com_err codes.  Use krb5_get_error_message() to obtain a
 * string describing the error.
 */
typedef krb5_int32      krb5_error_code;

typedef krb5_error_code krb5_magic;

typedef struct _krb5_data {
    krb5_magic magic;
    unsigned int length;
    char *data;
} krb5_data;

/* Originally introduced for PKINIT; now unused.  Do not use this. */
typedef struct _krb5_octet_data {
    krb5_magic magic;
    unsigned int length;
    krb5_octet *data;
} krb5_octet_data;

/* Originally used to recognize AFS and default salts.  No longer used. */
#define SALT_TYPE_AFS_LENGTH UINT_MAX
#define SALT_TYPE_NO_LENGTH  UINT_MAX

typedef void * krb5_pointer;
typedef void const * krb5_const_pointer;

typedef struct krb5_principal_data {
    krb5_magic magic;
    krb5_data realm;
    krb5_data *data;            /**< An array of strings */
    krb5_int32 length;
    krb5_int32 type;
} krb5_principal_data;

typedef krb5_principal_data * krb5_principal;

/*
 * Per V5 spec on definition of principal types
 */

#define KRB5_NT_UNKNOWN        0 /**<  Name type not known */
#define KRB5_NT_PRINCIPAL      1 /**< Just the name of the principal
                                      as in DCE, or for users */
#define KRB5_NT_SRV_INST       2 /**< Service and other unique instance (krbtgt) */
#define KRB5_NT_SRV_HST        3 /**< Service with host name as instance
                                      (telnet, rcommands) */
#define KRB5_NT_SRV_XHST       4 /**< Service with host as remaining components */
#define KRB5_NT_UID            5 /**< Unique ID */
#define KRB5_NT_X500_PRINCIPAL 6 /**< PKINIT */
#define KRB5_NT_SMTP_NAME      7 /**< Name in form of SMTP email name */
#define KRB5_NT_ENTERPRISE_PRINCIPAL  10        /**< Windows 2000 UPN */
#define KRB5_NT_WELLKNOWN      11 /**< Well-known (special) principal */
#define KRB5_WELLKNOWN_NAMESTR "WELLKNOWN" /**< First component of
                                                NT_WELLKNOWN principals */
#define KRB5_NT_MS_PRINCIPAL         -128 /**< Windows 2000 UPN and SID */
#define KRB5_NT_MS_PRINCIPAL_AND_ID  -129 /**< NT 4 style name */
#define KRB5_NT_ENT_PRINCIPAL_AND_ID -130 /**< NT 4 style name and SID */

/** Constant version of krb5_principal_data. */
typedef const krb5_principal_data *krb5_const_principal;

#define krb5_princ_realm(context, princ) (&(princ)->realm)
#define krb5_princ_set_realm(context, princ,value) ((princ)->realm = *(value))
#define krb5_princ_set_realm_length(context, princ,value) (princ)->realm.length = (value)
#define krb5_princ_set_realm_data(context, princ,value) (princ)->realm.data = (value)
#define krb5_princ_size(context, princ) (princ)->length
#define krb5_princ_type(context, princ) (princ)->type
#define krb5_princ_name(context, princ) (princ)->data
#define krb5_princ_component(context, princ,i)  \
    (((i) < krb5_princ_size(context, princ))    \
     ? (princ)->data + (i)                      \
     : NULL)

/** Constant for realm referrals. */
#define        KRB5_REFERRAL_REALM      ""

/*
 * Referral-specific functions.
 */

/**
 * Check for a match with KRB5_REFERRAL_REALM.
 *
 * @param [in] r                Realm to check
 *
 * @return @c TRUE if @a r is zero-length, @c FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_is_referral_realm(const krb5_data *r);

/**
 * Return an anonymous realm data.
 *
 * This function returns constant storage that must not be freed.
 *
 * @sa #KRB5_ANONYMOUS_REALMSTR
 */
const krb5_data *KRB5_CALLCONV
krb5_anonymous_realm(void);

/**
 * Build an anonymous principal.
 *
 * This function returns constant storage that must not be freed.
 *
 * @sa #KRB5_ANONYMOUS_PRINCSTR
 */
krb5_const_principal KRB5_CALLCONV
krb5_anonymous_principal(void);

#define KRB5_ANONYMOUS_REALMSTR "WELLKNOWN:ANONYMOUS" /**< Anonymous realm */
#define KRB5_ANONYMOUS_PRINCSTR "ANONYMOUS" /**< Anonymous principal name */
/*
 * end "base-defs.h"
 */

/*
 * begin "hostaddr.h"
 */

/** Structure for address */
typedef struct _krb5_address {
    krb5_magic magic;
    krb5_addrtype addrtype;
    unsigned int length;
    krb5_octet *contents;
} krb5_address;

/* per Kerberos v5 protocol spec */
#define ADDRTYPE_INET           0x0002
#define ADDRTYPE_CHAOS          0x0005
#define ADDRTYPE_XNS            0x0006
#define ADDRTYPE_ISO            0x0007
#define ADDRTYPE_DDP            0x0010
#define ADDRTYPE_NETBIOS        0x0014
#define ADDRTYPE_INET6          0x0018
/* not yet in the spec... */
#define ADDRTYPE_ADDRPORT       0x0100
#define ADDRTYPE_IPPORT         0x0101

/* macros to determine if a type is a local type */
#define ADDRTYPE_IS_LOCAL(addrtype) (addrtype & 0x8000)

/*
 * end "hostaddr.h"
 */

struct _krb5_context;
typedef struct _krb5_context * krb5_context;

struct _krb5_auth_context;
typedef struct _krb5_auth_context * krb5_auth_context;

struct _krb5_cryptosystem_entry;

/*
 * begin "encryption.h"
 */

/** Exposed contents of a key. */
typedef struct _krb5_keyblock {
    krb5_magic magic;
    krb5_enctype enctype;
    unsigned int length;
    krb5_octet *contents;
} krb5_keyblock;

struct krb5_key_st;
/**
 * Opaque identifier for a key.
 *
 * Use with the krb5_k APIs for better performance for repeated operations with
 * the same key and usage.  Key identifiers must not be used simultaneously
 * within multiple threads, as they may contain mutable internal state and are
 * not mutex-protected.
 */
typedef struct krb5_key_st *krb5_key;

#ifdef KRB5_OLD_CRYPTO
typedef struct _krb5_encrypt_block {
    krb5_magic magic;
    krb5_enctype crypto_entry;          /* to call krb5_encrypt_size, you need
                                           this.  it was a pointer, but it
                                           doesn't have to be.  gross. */
    krb5_keyblock *key;
} krb5_encrypt_block;
#endif

typedef struct _krb5_checksum {
    krb5_magic magic;
    krb5_cksumtype checksum_type;       /* checksum type */
    unsigned int length;
    krb5_octet *contents;
} krb5_checksum;

typedef struct _krb5_enc_data {
    krb5_magic magic;
    krb5_enctype enctype;
    krb5_kvno kvno;
    krb5_data ciphertext;
} krb5_enc_data;

/**
 * Structure to describe a region of text to be encrypted or decrypted.
 *
 * The @a flags member describes the type of the iov.
 * The @a data member points to the memory that will be manipulated.
 * All iov APIs take a pointer to the first element of an array of krb5_crypto_iov's
 * along with the size of that array. Buffer contents are manipulated in-place;
 * data is overwritten. Callers must allocate the right number of krb5_crypto_iov
 * structures before calling into an iov API.
 */
typedef struct _krb5_crypto_iov {
    krb5_cryptotype flags; /**< @ref KRB5_CRYPTO_TYPE type of the iov */
    krb5_data data;
} krb5_crypto_iov;

/* per Kerberos v5 protocol spec */
#define ENCTYPE_NULL            0x0000
#define ENCTYPE_DES_CBC_CRC     0x0001  /**< @deprecated no longer supported */
#define ENCTYPE_DES_CBC_MD4     0x0002  /**< @deprecated no longer supported */
#define ENCTYPE_DES_CBC_MD5     0x0003  /**< @deprecated no longer supported */
#define ENCTYPE_DES_CBC_RAW     0x0004  /**< @deprecated no longer supported */
#define ENCTYPE_DES3_CBC_SHA    0x0005  /**< @deprecated no longer supported */
#define ENCTYPE_DES3_CBC_RAW    0x0006  /**< @deprecated no longer supported */
#define ENCTYPE_DES_HMAC_SHA1   0x0008  /**< @deprecated no longer supported */
/* PKINIT */
#define ENCTYPE_DSA_SHA1_CMS    0x0009  /**< DSA with SHA1, CMS signature */
#define ENCTYPE_MD5_RSA_CMS     0x000a  /**< MD5 with RSA, CMS signature */
#define ENCTYPE_SHA1_RSA_CMS    0x000b  /**< SHA1 with RSA, CMS signature */
#define ENCTYPE_RC2_CBC_ENV     0x000c  /**< RC2 cbc mode, CMS enveloped data */
#define ENCTYPE_RSA_ENV         0x000d  /**< RSA encryption, CMS enveloped data */
#define ENCTYPE_RSA_ES_OAEP_ENV 0x000e  /**< RSA w/OEAP encryption, CMS enveloped data */
#define ENCTYPE_DES3_CBC_ENV    0x000f  /**< @deprecated no longer supported */

#define ENCTYPE_DES3_CBC_SHA1               0x0010 /**< @deprecated removed */
#define ENCTYPE_AES128_CTS_HMAC_SHA1_96     0x0011 /**< RFC 3962 */
#define ENCTYPE_AES256_CTS_HMAC_SHA1_96     0x0012 /**< RFC 3962 */
#define ENCTYPE_AES128_CTS_HMAC_SHA256_128  0x0013 /**< RFC 8009 */
#define ENCTYPE_AES256_CTS_HMAC_SHA384_192  0x0014 /**< RFC 8009 */
#define ENCTYPE_ARCFOUR_HMAC                0x0017 /**< RFC 4757 */
#define ENCTYPE_ARCFOUR_HMAC_EXP            0x0018 /**< RFC 4757 */
#define ENCTYPE_CAMELLIA128_CTS_CMAC        0x0019 /**< RFC 6803 */
#define ENCTYPE_CAMELLIA256_CTS_CMAC        0x001a /**< RFC 6803 */
#define ENCTYPE_UNKNOWN                     0x01ff

/*
 * Historically we used the value 9 for unkeyed SHA-1.  RFC 3961 assigns this
 * value to rsa-md5-des3, which fortunately is unused.  For ABI compatibility
 * we allow either 9 or 14 for SHA-1.
 */
#define CKSUMTYPE_CRC32         0x0001
#define CKSUMTYPE_RSA_MD4       0x0002
#define CKSUMTYPE_RSA_MD4_DES   0x0003
#define CKSUMTYPE_DESCBC        0x0004
/* des-mac-k */
/* rsa-md4-des-k */
#define CKSUMTYPE_RSA_MD5       0x0007
#define CKSUMTYPE_RSA_MD5_DES   0x0008
#define CKSUMTYPE_NIST_SHA      0x0009
#define CKSUMTYPE_HMAC_SHA1_DES3      0x000c /* @deprecated removed */
#define CKSUMTYPE_SHA1          0x000e /**< RFC 3961 */
#define CKSUMTYPE_HMAC_SHA1_96_AES128 0x000f /**< RFC 3962. Used with
                                                ENCTYPE_AES128_CTS_HMAC_SHA1_96 */
#define CKSUMTYPE_HMAC_SHA1_96_AES256 0x0010 /**< RFC 3962. Used with
                                                ENCTYPE_AES256_CTS_HMAC_SHA1_96 */
#define CKSUMTYPE_HMAC_SHA256_128_AES128 0x0013 /**< RFC 8009 */
#define CKSUMTYPE_HMAC_SHA384_192_AES256 0x0014 /**< RFC 8009 */
#define CKSUMTYPE_CMAC_CAMELLIA128 0x0011 /**< RFC 6803 */
#define CKSUMTYPE_CMAC_CAMELLIA256 0x0012 /**< RFC 6803 */
#define CKSUMTYPE_MD5_HMAC_ARCFOUR -137 /* Microsoft netlogon */
#define CKSUMTYPE_HMAC_MD5_ARCFOUR -138 /**< RFC 4757 */

/* Constants for the deprecated krb5_c_random_add_entropy() */
enum {
    KRB5_C_RANDSOURCE_OLDAPI = 0,
    KRB5_C_RANDSOURCE_OSRAND = 1,
    KRB5_C_RANDSOURCE_TRUSTEDPARTY = 2,
    KRB5_C_RANDSOURCE_TIMING = 3,
    KRB5_C_RANDSOURCE_EXTERNAL_PROTOCOL = 4,
    KRB5_C_RANDSOURCE_MAX = 5
};

#ifndef krb5_roundup
/* round x up to nearest multiple of y */
#define krb5_roundup(x, y) ((((x) + (y) - 1)/(y))*(y))
#endif /* roundup */

/* macro function definitions to help clean up code */

#if 1
#define krb5_x(ptr,args) ((ptr)?((*(ptr)) args):(abort(),1))
#define krb5_xc(ptr,args) ((ptr)?((*(ptr)) args):(abort(),(char*)0))
#else
#define krb5_x(ptr,args) ((*(ptr)) args)
#define krb5_xc(ptr,args) ((*(ptr)) args)
#endif

/**
 * Encrypt data using a key (operates on keyblock).
 *
 * @param [in]     context      Library context
 * @param [in]     key          Encryption key
 * @param [in]     usage        Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in,out] cipher_state Cipher state; specify NULL if not needed
 * @param [in]     input        Data to be encrypted
 * @param [out]    output       Encrypted data
 *
 * This function encrypts the data block @a input and stores the output into @a
 * output.  The actual encryption key will be derived from @a key and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the encryption operation, and
 * is updated with the state to be passed as input to the next operation.
 *
 * @note The caller must initialize @a output and allocate at least enough
 * space for the result (using krb5_c_encrypt_length() to determine the amount
 * of space needed).  @a output->length will be set to the actual length of the
 * ciphertext.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_encrypt(krb5_context context, const krb5_keyblock *key,
               krb5_keyusage usage, const krb5_data *cipher_state,
               const krb5_data *input, krb5_enc_data *output);

/**
 * Decrypt data using a key (operates on keyblock).
 *
 * @param [in]     context      Library context
 * @param [in]     key          Encryption key
 * @param [in]     usage        Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in,out] cipher_state Cipher state; specify NULL if not needed
 * @param [in]     input        Encrypted data
 * @param [out]    output       Decrypted data
 *
 * This function decrypts the data block @a input and stores the output into @a
 * output. The actual decryption key will be derived from @a key and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the decryption operation, and
 * is updated with the state to be passed as input to the next operation.
 *
 * @note The caller must initialize @a output and allocate at least enough
 * space for the result.  The usual practice is to allocate an output buffer as
 * long as the ciphertext, and let krb5_c_decrypt() trim @a output->length.
 * For some enctypes, the resulting @a output->length may include padding
 * bytes.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_decrypt(krb5_context context, const krb5_keyblock *key,
               krb5_keyusage usage, const krb5_data *cipher_state,
               const krb5_enc_data *input, krb5_data *output);

/**
 * Compute encrypted data length.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [in]  inputlen        Length of the data to be encrypted
 * @param [out] length          Length of the encrypted data
 *
 * This function computes the length of the ciphertext produced by encrypting
 * @a inputlen bytes including padding, confounder, and checksum.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_encrypt_length(krb5_context context, krb5_enctype enctype,
                      size_t inputlen, size_t *length);

/**
 * Return cipher block size.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [out] blocksize       Block size for @a enctype
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_block_size(krb5_context context, krb5_enctype enctype,
                  size_t *blocksize);

/**
 * Return length of the specified key in bytes.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [out] keybytes        Number of bytes required to make a key
 * @param [out] keylength       Length of final key
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_keylengths(krb5_context context, krb5_enctype enctype,
                  size_t *keybytes, size_t *keylength);

/**
 * Initialize a new cipher state.
 *
 * @param [in]  context         Library context
 * @param [in]  key             Key
 * @param [in]  usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [out] new_state       New cipher state
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_init_state(krb5_context context, const krb5_keyblock *key,
                  krb5_keyusage usage, krb5_data *new_state);

/**
 * Free a cipher state previously allocated by krb5_c_init_state().
 *
 * @param [in] context          Library context
 * @param [in] key              Key
 * @param [in] state            Cipher state to be freed
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_free_state(krb5_context context, const krb5_keyblock *key,
                  krb5_data *state);

/**
 * Generate enctype-specific pseudo-random bytes.
 *
 * @param [in]  context         Library context
 * @param [in]  keyblock        Key
 * @param [in]  input           Input data
 * @param [out] output          Output data
 *
 * This function selects a pseudo-random function based on @a keyblock and
 * computes its value over @a input, placing the result into @a output.
 * The caller must preinitialize @a output and allocate space for the
 * result, using krb5_c_prf_length() to determine the required length.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_prf(krb5_context context, const krb5_keyblock *keyblock,
           krb5_data *input, krb5_data *output);

/**
 * Get the output length of pseudo-random functions for an encryption type.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [out] len             Length of PRF output
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_prf_length(krb5_context context, krb5_enctype enctype, size_t *len);

/**
 * Generate pseudo-random bytes using RFC 6113 PRF+.
 *
 * @param [in]  context         Library context
 * @param [in]  k               KDC contribution key
 * @param [in]  input           Input data
 * @param [out] output          Pseudo-random output buffer
 *
 * This function fills @a output with PRF+(k, input) as defined in RFC 6113
 * section 5.1.  The caller must preinitialize @a output and allocate the
 * desired amount of space.  The length of the pseudo-random output will match
 * the length of @a output.
 *
 * @note RFC 4402 defines a different PRF+ operation.  This function does not
 * implement that operation.
 *
 * @return 0 on success, @c E2BIG if output->length is too large for PRF+ to
 * generate, @c ENOMEM on allocation failure, or an error code from
 * krb5_c_prf()
 */
krb5_error_code KRB5_CALLCONV
krb5_c_prfplus(krb5_context context, const krb5_keyblock *k,
               const krb5_data *input, krb5_data *output);

/**
 * Derive a key using some input data (via RFC 6113 PRF+).
 *
 * @param [in]  context         Library context
 * @param [in]  k               KDC contribution key
 * @param [in]  input           Input string
 * @param [in]  enctype         Output key enctype (or @c ENCTYPE_NULL)
 * @param [out] out             Derived keyblock
 *
 * This function uses PRF+ as defined in RFC 6113 to derive a key from another
 * key and an input string.  If @a enctype is @c ENCTYPE_NULL, the output key
 * will have the same enctype as the input key.
 */
krb5_error_code KRB5_CALLCONV
krb5_c_derive_prfplus(krb5_context context, const krb5_keyblock *k,
                      const krb5_data *input, krb5_enctype enctype,
                      krb5_keyblock **out);

/**
 * Compute the KRB-FX-CF2 combination of two keys and pepper strings.
 *
 * @param [in]  context         Library context
 * @param [in]  k1              KDC contribution key
 * @param [in]  pepper1         String "PKINIT"
 * @param [in]  k2              Reply key
 * @param [in]  pepper2         String "KeyExchange"
 * @param [out] out             Output key
 *
 * This function computes the KRB-FX-CF2 function over its inputs and places
 * the results in a newly allocated keyblock.  This function is simple in that
 * it assumes that @a pepper1 and @a pepper2 are C strings with no internal
 * nulls and that the enctype of the result will be the same as that of @a k1.
 * @a k1 and @a k2 may be of different enctypes.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_fx_cf2_simple(krb5_context context,
                     const krb5_keyblock *k1, const char *pepper1,
                     const krb5_keyblock *k2, const char *pepper2,
                     krb5_keyblock **out);

/**
 * Generate an enctype-specific random encryption key.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type of the generated key
 * @param [out] k5_random_key   An allocated and initialized keyblock
 *
 * Use krb5_free_keyblock_contents() to free @a k5_random_key when
 * no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_make_random_key(krb5_context context, krb5_enctype enctype,
                       krb5_keyblock *k5_random_key);

/**
 * Generate an enctype-specific key from random data.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [in]  random_data     Random input data
 * @param [out] k5_random_key   Resulting key
 *
 * This function takes random input data @a random_data and produces a valid
 * key @a k5_random_key for a given @a enctype.
 *
 * @note It is assumed that @a k5_random_key has already been initialized and
 * @a k5_random_key->contents has been allocated with the correct length.
 *
 * @sa krb5_c_keylengths()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_random_to_key(krb5_context context, krb5_enctype enctype,
                     krb5_data *random_data, krb5_keyblock *k5_random_key);

/** @deprecated This call is no longer necessary. */
krb5_error_code KRB5_CALLCONV
krb5_c_random_add_entropy(krb5_context context, unsigned int randsource,
                          const krb5_data *data);

/**
 * Generate pseudo-random bytes.
 *
 * @param [in]  context         Library context
 * @param [out] data            Random data
 *
 * Fills in @a data with bytes from the PRNG used by krb5 crypto operations.
 * The caller must preinitialize @a data and allocate the desired amount of
 * space.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_random_make_octets(krb5_context context, krb5_data *data);

/** @deprecated This call is no longer necessary. */
krb5_error_code KRB5_CALLCONV
krb5_c_random_os_entropy(krb5_context context, int strong, int *success);

/** @deprecated This call is no longer necessary. */
krb5_error_code KRB5_CALLCONV
krb5_c_random_seed(krb5_context context, krb5_data *data);

/**
 * Convert a string (such a password) to a key.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [in]  string          String to be converted
 * @param [in]  salt            Salt value
 * @param [out] key             Generated key
 *
 * This function converts @a string to a @a key of encryption type @a enctype,
 * using the specified @a salt.  The newly created @a key must be released by
 * calling krb5_free_keyblock_contents() when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_string_to_key(krb5_context context, krb5_enctype enctype,
                     const krb5_data *string, const krb5_data *salt,
                     krb5_keyblock *key);

/**
 * Convert a string (such as a password) to a key with additional parameters.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [in]  string          String to be converted
 * @param [in]  salt            Salt value
 * @param [in]  params          Parameters
 * @param [out] key             Generated key
 *
 * This function is similar to krb5_c_string_to_key(), but also takes
 * parameters which may affect the algorithm in an enctype-dependent way.  The
 * newly created @a key must be released by calling
 * krb5_free_keyblock_contents() when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_string_to_key_with_params(krb5_context context,
                                 krb5_enctype enctype,
                                 const krb5_data *string,
                                 const krb5_data *salt,
                                 const krb5_data *params,
                                 krb5_keyblock *key);

/**
 * Compare two encryption types.
 *
 * @param [in]  context         Library context
 * @param [in]  e1              First encryption type
 * @param [in]  e2              Second encryption type
 * @param [out] similar         @c TRUE if types are similar, @c FALSE if not
 *
 * This function determines whether two encryption types use the same kind of
 * keys.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_enctype_compare(krb5_context context, krb5_enctype e1, krb5_enctype e2,
                       krb5_boolean *similar);

/**
 * Compute a checksum (operates on keyblock).
 *
 * @param [in]  context         Library context
 * @param [in]  cksumtype       Checksum type (0 for mandatory type)
 * @param [in]  key             Encryption key for a keyed checksum
 * @param [in]  usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]  input           Input data
 * @param [out] cksum           Generated checksum
 *
 * This function computes a checksum of type @a cksumtype over @a input, using
 * @a key if the checksum type is a keyed checksum.  If @a cksumtype is 0 and
 * @a key is non-null, the checksum type will be the mandatory-to-implement
 * checksum type for the key's encryption type.  The actual checksum key will
 * be derived from @a key and @a usage if key derivation is specified for the
 * checksum type.  The newly created @a cksum must be released by calling
 * krb5_free_checksum_contents() when it is no longer needed.
 *
 * @note This function is similar to krb5_k_make_checksum(), but operates
 * on keyblock @a key.
 *
 * @sa krb5_c_verify_checksum()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_make_checksum(krb5_context context, krb5_cksumtype cksumtype,
                     const krb5_keyblock *key, krb5_keyusage usage,
                     const krb5_data *input, krb5_checksum *cksum);

/**
 * Verify a checksum (operates on keyblock).
 *
 * @param [in]  context         Library context
 * @param [in]  key             Encryption key for a keyed checksum
 * @param [in]  usage           @a key usage
 * @param [in]  data            Data to be used to compute a new checksum
 *                              using @a key to compare @a cksum against
 * @param [in]  cksum           Checksum to be verified
 * @param [out] valid           Non-zero for success, zero for failure
 *
 * This function verifies that @a cksum is a valid checksum for @a data.  If
 * the checksum type of @a cksum is a keyed checksum, @a key is used to verify
 * the checksum.  If the checksum type in @a cksum is 0 and @a key is not NULL,
 * the mandatory checksum type for @a key will be used.  The actual checksum
 * key will be derived from @a key and @a usage if key derivation is specified
 * for the checksum type.
 *
 * @note This function is similar to krb5_k_verify_checksum(), but operates
 * on keyblock @a key.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_verify_checksum(krb5_context context, const krb5_keyblock *key,
                       krb5_keyusage usage, const krb5_data *data,
                       const krb5_checksum *cksum, krb5_boolean *valid);

/**
 * Return the length of checksums for a checksum type.
 *
 * @param [in]  context         Library context
 * @param [in]  cksumtype       Checksum type
 * @param [out] length          Checksum length
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_checksum_length(krb5_context context, krb5_cksumtype cksumtype,
                       size_t *length);

/**
 * Return a list of keyed checksum types usable with an encryption type.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [out] count           Count of allowable checksum types
 * @param [out] cksumtypes      Array of allowable checksum types
 *
 * Use krb5_free_cksumtypes() to free @a cksumtypes when it is no longer
 * needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_keyed_checksum_types(krb5_context context, krb5_enctype enctype,
                            unsigned int *count, krb5_cksumtype **cksumtypes);

/** @defgroup KRB5_KEYUSAGE KRB5_KEYUSAGE
 * @{
 */
#define KRB5_KEYUSAGE_AS_REQ_PA_ENC_TS          1
#define KRB5_KEYUSAGE_KDC_REP_TICKET            2
#define KRB5_KEYUSAGE_AS_REP_ENCPART            3
#define KRB5_KEYUSAGE_TGS_REQ_AD_SESSKEY        4
#define KRB5_KEYUSAGE_TGS_REQ_AD_SUBKEY         5
#define KRB5_KEYUSAGE_TGS_REQ_AUTH_CKSUM        6
#define KRB5_KEYUSAGE_TGS_REQ_AUTH              7
#define KRB5_KEYUSAGE_TGS_REP_ENCPART_SESSKEY   8
#define KRB5_KEYUSAGE_TGS_REP_ENCPART_SUBKEY    9
#define KRB5_KEYUSAGE_AP_REQ_AUTH_CKSUM         10
#define KRB5_KEYUSAGE_AP_REQ_AUTH               11
#define KRB5_KEYUSAGE_AP_REP_ENCPART            12
#define KRB5_KEYUSAGE_KRB_PRIV_ENCPART          13
#define KRB5_KEYUSAGE_KRB_CRED_ENCPART          14
#define KRB5_KEYUSAGE_KRB_SAFE_CKSUM            15
#define KRB5_KEYUSAGE_APP_DATA_ENCRYPT          16
#define KRB5_KEYUSAGE_APP_DATA_CKSUM            17
#define KRB5_KEYUSAGE_KRB_ERROR_CKSUM           18
#define KRB5_KEYUSAGE_AD_KDCISSUED_CKSUM        19
#define KRB5_KEYUSAGE_AD_MTE                    20
#define KRB5_KEYUSAGE_AD_ITE                    21

/* XXX need to register these */

#define KRB5_KEYUSAGE_GSS_TOK_MIC               22
#define KRB5_KEYUSAGE_GSS_TOK_WRAP_INTEG        23
#define KRB5_KEYUSAGE_GSS_TOK_WRAP_PRIV         24

/* Defined in Integrating SAM Mechanisms with Kerberos draft */
#define KRB5_KEYUSAGE_PA_SAM_CHALLENGE_CKSUM    25
/** Note conflict with @ref KRB5_KEYUSAGE_PA_S4U_X509_USER_REQUEST */
#define KRB5_KEYUSAGE_PA_SAM_CHALLENGE_TRACKID  26
/** Note conflict with @ref KRB5_KEYUSAGE_PA_S4U_X509_USER_REPLY */
#define KRB5_KEYUSAGE_PA_SAM_RESPONSE           27

/* Defined in [MS-SFU] */
/** Note conflict with @ref KRB5_KEYUSAGE_PA_SAM_CHALLENGE_TRACKID */
#define KRB5_KEYUSAGE_PA_S4U_X509_USER_REQUEST  26
/** Note conflict with @ref KRB5_KEYUSAGE_PA_SAM_RESPONSE */
#define KRB5_KEYUSAGE_PA_S4U_X509_USER_REPLY    27

/* unused */
#define KRB5_KEYUSAGE_PA_REFERRAL               26

#define KRB5_KEYUSAGE_AD_SIGNEDPATH             -21
#define KRB5_KEYUSAGE_IAKERB_FINISHED           42
#define KRB5_KEYUSAGE_PA_PKINIT_KX              44
#define KRB5_KEYUSAGE_PA_OTP_REQUEST  45  /**< See RFC 6560 section 4.2 */
/* define in draft-ietf-krb-wg-preauth-framework*/
#define KRB5_KEYUSAGE_FAST_REQ_CHKSUM 50
#define KRB5_KEYUSAGE_FAST_ENC 51
#define KRB5_KEYUSAGE_FAST_REP 52
#define KRB5_KEYUSAGE_FAST_FINISHED 53
#define KRB5_KEYUSAGE_ENC_CHALLENGE_CLIENT 54
#define KRB5_KEYUSAGE_ENC_CHALLENGE_KDC 55
#define KRB5_KEYUSAGE_AS_REQ 56
#define KRB5_KEYUSAGE_CAMMAC 64
#define KRB5_KEYUSAGE_SPAKE 65

/* Key usage values 512-1023 are reserved for uses internal to a Kerberos
 * implementation. */
#define KRB5_KEYUSAGE_PA_FX_COOKIE 513  /**< Used for encrypted FAST cookies */
#define KRB5_KEYUSAGE_PA_AS_FRESHNESS 514  /**< Used for freshness tokens */
/** @} */ /* end of KRB5_KEYUSAGE group */

/**
 * Verify that a specified encryption type is a valid Kerberos encryption type.
 *
 * @param [in] ktype            Encryption type
 *
 * @return @c TRUE if @a ktype is valid, @c FALSE if not
 */
krb5_boolean KRB5_CALLCONV
krb5_c_valid_enctype(krb5_enctype ktype);

/**
 * Verify that specified checksum type is a valid Kerberos checksum type.
 *
 * @param [in] ctype            Checksum type
 *
 * @return @c TRUE if @a ctype is valid, @c FALSE if not
 */
krb5_boolean KRB5_CALLCONV
krb5_c_valid_cksumtype(krb5_cksumtype ctype);

/**
 * Test whether a checksum type is collision-proof.
 *
 * @param [in] ctype            Checksum type
 *
 * @return @c TRUE if @a ctype is collision-proof, @c FALSE if it is not
 * collision-proof or not a valid checksum type.
 */
krb5_boolean KRB5_CALLCONV
krb5_c_is_coll_proof_cksum(krb5_cksumtype ctype);

/**
 * Test whether a checksum type is keyed.
 *
 * @param [in] ctype            Checksum type
 *
 * @return @c TRUE if @a ctype is a keyed checksum type, @c FALSE otherwise.
 */
krb5_boolean KRB5_CALLCONV
krb5_c_is_keyed_cksum(krb5_cksumtype ctype);

/* AEAD APIs */
/** @defgroup KRB5_CRYPTO_TYPE KRB5_CRYPTO_TYPE
 * @{
 */
#define KRB5_CRYPTO_TYPE_EMPTY      0   /**< [in] ignored */
#define KRB5_CRYPTO_TYPE_HEADER     1   /**< [out] header */
#define KRB5_CRYPTO_TYPE_DATA       2   /**< [in, out] plaintext */
#define KRB5_CRYPTO_TYPE_SIGN_ONLY  3   /**< [in] associated data */
#define KRB5_CRYPTO_TYPE_PADDING    4   /**< [out] padding */
#define KRB5_CRYPTO_TYPE_TRAILER    5   /**< [out] checksum for encrypt */
#define KRB5_CRYPTO_TYPE_CHECKSUM   6   /**< [out] checksum for MIC */
#define KRB5_CRYPTO_TYPE_STREAM     7   /**< [in] entire message without
                                           decomposing the structure into
                                           header, data and trailer buffers */
/** @} */ /* end of KRB5_CRYPTO_TYPE group */

/**
 * Fill in a checksum element in IOV array (operates on keyblock)
 *
 * @param [in]     context         Library context
 * @param [in]     cksumtype       Checksum type (0 for mandatory type)
 * @param [in]     key             Encryption key for a keyed checksum
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in,out] data            IOV array
 * @param [in]     num_data        Size of @a data
 *
 * Create a checksum in the #KRB5_CRYPTO_TYPE_CHECKSUM element over
 * #KRB5_CRYPTO_TYPE_DATA and #KRB5_CRYPTO_TYPE_SIGN_ONLY chunks in @a data.
 * Only the #KRB5_CRYPTO_TYPE_CHECKSUM region is modified.
 *
 * @note This function is similar to krb5_k_make_checksum_iov(), but operates
 * on keyblock @a key.
 *
 * @sa krb5_c_verify_checksum_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_make_checksum_iov(krb5_context context, krb5_cksumtype cksumtype,
                         const krb5_keyblock *key, krb5_keyusage usage,
                         krb5_crypto_iov *data, size_t num_data);

/**
 * Validate a checksum element in IOV array (operates on keyblock).
 *
 * @param [in]     context         Library context
 * @param [in]     cksumtype       Checksum type (0 for mandatory type)
 * @param [in]     key             Encryption key for a keyed checksum
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]     data            IOV array
 * @param [in]     num_data        Size of @a data
 * @param [out]    valid           Non-zero for success, zero for failure
 *
 * Confirm that the checksum in the #KRB5_CRYPTO_TYPE_CHECKSUM element is a
 * valid checksum of the #KRB5_CRYPTO_TYPE_DATA and #KRB5_CRYPTO_TYPE_SIGN_ONLY
 * regions in the iov.
 *
 * @note This function is similar to krb5_k_verify_checksum_iov(), but operates
 * on keyblock @a key.
 *
 * @sa krb5_c_make_checksum_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_verify_checksum_iov(krb5_context context, krb5_cksumtype cksumtype,
                           const krb5_keyblock *key, krb5_keyusage usage,
                           const krb5_crypto_iov *data, size_t num_data,
                           krb5_boolean *valid);

/**
 * Encrypt data in place supporting AEAD (operates on keyblock).
 *
 * @param [in]     context         Library context
 * @param [in]     keyblock        Encryption key
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]     cipher_state    Cipher state; specify NULL if not needed
 * @param [in,out] data            IOV array. Modified in-place.
 * @param [in]     num_data        Size of @a data
 *
 * This function encrypts the data block @a data and stores the output in-place.
 * The actual encryption key will be derived from @a keyblock and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the encryption operation, and
 * is updated with the state to be passed as input to the next operation.
 * The caller must allocate the right number of krb5_crypto_iov
 * structures before calling into this API.
 *
 * @note On return from a krb5_c_encrypt_iov() call, the @a data->length in the
 * iov structure are adjusted to reflect actual lengths of the ciphertext used.
 * For example, if the padding length is too large, the length will be reduced.
 * Lengths are never increased.
 *
 * @note This function is similar to krb5_k_encrypt_iov(), but operates
 * on keyblock @a keyblock.
 *
 * @sa krb5_c_decrypt_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_encrypt_iov(krb5_context context, const krb5_keyblock *keyblock,
                   krb5_keyusage usage, const krb5_data *cipher_state,
                   krb5_crypto_iov *data, size_t num_data);

/**
 * Decrypt data in place supporting AEAD (operates on keyblock).
 *
 * @param [in]     context         Library context
 * @param [in]     keyblock        Encryption key
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]     cipher_state    Cipher state; specify NULL if not needed
 * @param [in,out] data            IOV array. Modified in-place.
 * @param [in]     num_data        Size of @a data
 *
 * This function decrypts the data block @a data and stores the output in-place.
 * The actual decryption key will be derived from @a keyblock and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the decryption operation, and
 * is updated with the state to be passed as input to the next operation.
 * The caller must allocate the right number of krb5_crypto_iov
 * structures before calling into this API.
 *
 * @note On return from a krb5_c_decrypt_iov() call, the @a data->length in the
 * iov structure are adjusted to reflect actual lengths of the ciphertext used.
 * For example, if the padding length is too large, the length will be reduced.
 * Lengths are never increased.
 *
 * @note This function is similar to krb5_k_decrypt_iov(), but operates
 * on keyblock @a keyblock.
 *
 * @sa krb5_c_decrypt_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_decrypt_iov(krb5_context context, const krb5_keyblock *keyblock,
                   krb5_keyusage usage, const krb5_data *cipher_state,
                   krb5_crypto_iov *data, size_t num_data);

/**
 * Return a length of a message field specific to the encryption type.
 *
 * @param [in]  context      Library context
 * @param [in]  enctype      Encryption type
 * @param [in]  type         Type field (See @ref KRB5_CRYPTO_TYPE types)
 * @param [out] size         Length of the @a type specific to @a enctype
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_crypto_length(krb5_context context, krb5_enctype enctype,
                     krb5_cryptotype type, unsigned int *size);

/**
 * Fill in lengths for header, trailer and padding in a IOV array.
 *
 * @param [in]      context      Library context
 * @param [in]      enctype      Encryption type
 * @param [in,out]  data         IOV array
 * @param [in]      num_data     Size of @a data
 *
 * Padding is set to the actual padding required based on the provided
 * @a data buffers. Typically this API is used after setting up the data
 * buffers and #KRB5_CRYPTO_TYPE_SIGN_ONLY buffers, but before actually
 * allocating header, trailer and padding.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_c_crypto_length_iov(krb5_context context, krb5_enctype enctype,
                         krb5_crypto_iov *data, size_t num_data);

/**
 * Return a number of padding octets.
 *
 * @param [in]  context      Library context
 * @param [in]  enctype      Encryption type
 * @param [in]  data_length  Length of the plaintext to pad
 * @param [out] size         Number of padding octets
 *
 * This function returns the number of the padding octets required to pad
 * @a data_length octets of plaintext.
 *
 * @retval 0 Success; otherwise - KRB5_BAD_ENCTYPE
 */
krb5_error_code KRB5_CALLCONV
krb5_c_padding_length(krb5_context context, krb5_enctype enctype,
                      size_t data_length, unsigned int *size);

/**
 * Create a krb5_key from the enctype and key data in a keyblock.
 *
 * @param [in]  context      Library context
 * @param [in]  key_data     Keyblock
 * @param [out] out          Opaque key
 *
 * The reference count on a key @a out is set to 1.
 * Use krb5_k_free_key() to free @a out when it is no longer needed.
 *
 * @retval 0 Success; otherwise - KRB5_BAD_ENCTYPE
 */
krb5_error_code KRB5_CALLCONV
krb5_k_create_key(krb5_context context, const krb5_keyblock *key_data,
                  krb5_key *out);

/** Increment the reference count on a key. */
void KRB5_CALLCONV
krb5_k_reference_key(krb5_context context, krb5_key key);

/** Decrement the reference count on a key and free it if it hits zero. */
void KRB5_CALLCONV
krb5_k_free_key(krb5_context context, krb5_key key);

/** Retrieve a copy of the keyblock from a krb5_key structure. */
krb5_error_code KRB5_CALLCONV
krb5_k_key_keyblock(krb5_context context, krb5_key key,
                    krb5_keyblock **key_data);

/** Retrieve the enctype of a krb5_key structure. */
krb5_enctype KRB5_CALLCONV
krb5_k_key_enctype(krb5_context context, krb5_key key);

/**
 * Encrypt data using a key (operates on opaque key).
 *
 * @param [in]     context      Library context
 * @param [in]     key          Encryption key
 * @param [in]     usage        Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in,out] cipher_state Cipher state; specify NULL if not needed
 * @param [in]     input        Data to be encrypted
 * @param [out]    output       Encrypted data
 *
 * This function encrypts the data block @a input and stores the output into @a
 * output.  The actual encryption key will be derived from @a key and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the encryption operation, and
 * is updated with the state to be passed as input to the next operation.
 *
 * @note The caller must initialize @a output and allocate at least enough
 * space for the result (using krb5_c_encrypt_length() to determine the amount
 * of space needed).  @a output->length will be set to the actual length of the
 * ciphertext.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_encrypt(krb5_context context, krb5_key key, krb5_keyusage usage,
               const krb5_data *cipher_state, const krb5_data *input,
               krb5_enc_data *output);

/**
 * Encrypt data in place supporting AEAD (operates on opaque key).
 *
 * @param [in]     context         Library context
 * @param [in]     key             Encryption key
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]     cipher_state    Cipher state; specify NULL if not needed
 * @param [in,out] data            IOV array. Modified in-place.
 * @param [in]     num_data        Size of @a data
 *
 * This function encrypts the data block @a data and stores the output in-place.
 * The actual encryption key will be derived from @a key and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the encryption operation, and
 * is updated with the state to be passed as input to the next operation.
 * The caller must allocate the right number of krb5_crypto_iov
 * structures before calling into this API.
 *
 * @note On return from a krb5_c_encrypt_iov() call, the @a data->length in the
 * iov structure are adjusted to reflect actual lengths of the ciphertext used.
 * For example, if the padding length is too large, the length will be reduced.
 * Lengths are never increased.
 *
 * @note This function is similar to krb5_c_encrypt_iov(), but operates
 * on opaque key @a key.
 *
 * @sa krb5_k_decrypt_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_encrypt_iov(krb5_context context, krb5_key key, krb5_keyusage usage,
                   const krb5_data *cipher_state, krb5_crypto_iov *data,
                   size_t num_data);

/**
 * Decrypt data using a key (operates on opaque key).
 *
 * @param [in]     context      Library context
 * @param [in]     key          Encryption key
 * @param [in]     usage        Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in,out] cipher_state Cipher state; specify NULL if not needed
 * @param [in]     input        Encrypted data
 * @param [out]    output       Decrypted data
 *
 * This function decrypts the data block @a input and stores the output into @a
 * output. The actual decryption key will be derived from @a key and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the decryption operation, and
 * is updated with the state to be passed as input to the next operation.
 *
 * @note The caller must initialize @a output and allocate at least enough
 * space for the result.  The usual practice is to allocate an output buffer as
 * long as the ciphertext, and let krb5_c_decrypt() trim @a output->length.
 * For some enctypes, the resulting @a output->length may include padding
 * bytes.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_decrypt(krb5_context context, krb5_key key, krb5_keyusage usage,
               const krb5_data *cipher_state, const krb5_enc_data *input,
               krb5_data *output);

/**
 * Decrypt data in place supporting AEAD (operates on opaque key).
 *
 * @param [in]     context         Library context
 * @param [in]     key             Encryption key
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]     cipher_state    Cipher state; specify NULL if not needed
 * @param [in,out] data            IOV array. Modified in-place.
 * @param [in]     num_data        Size of @a data
 *
 * This function decrypts the data block @a data and stores the output in-place.
 * The actual decryption key will be derived from @a key and @a usage
 * if key derivation is specified for the encryption type.  If non-null, @a
 * cipher_state specifies the beginning state for the decryption operation, and
 * is updated with the state to be passed as input to the next operation.
 * The caller must allocate the right number of krb5_crypto_iov
 * structures before calling into this API.
 *
 * @note On return from a krb5_c_decrypt_iov() call, the @a data->length in the
 * iov structure are adjusted to reflect actual lengths of the ciphertext used.
 * For example, if the padding length is too large, the length will be reduced.
 * Lengths are never increased.
 *
 * @note This function is similar to krb5_c_decrypt_iov(), but operates
 * on opaque key @a key.
 *
 * @sa krb5_k_encrypt_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_decrypt_iov(krb5_context context, krb5_key key, krb5_keyusage usage,
                   const krb5_data *cipher_state, krb5_crypto_iov *data,
                   size_t num_data);
/**
 * Compute a checksum (operates on opaque key).
 *
 * @param [in]  context         Library context
 * @param [in]  cksumtype       Checksum type (0 for mandatory type)
 * @param [in]  key             Encryption key for a keyed checksum
 * @param [in]  usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]  input           Input data
 * @param [out] cksum           Generated checksum
 *
 * This function computes a checksum of type @a cksumtype over @a input, using
 * @a key if the checksum type is a keyed checksum.  If @a cksumtype is 0 and
 * @a key is non-null, the checksum type will be the mandatory-to-implement
 * checksum type for the key's encryption type.  The actual checksum key will
 * be derived from @a key and @a usage if key derivation is specified for the
 * checksum type.  The newly created @a cksum must be released by calling
 * krb5_free_checksum_contents() when it is no longer needed.
 *
 * @note This function is similar to krb5_c_make_checksum(), but operates
 * on opaque @a key.
 *
 * @sa krb5_c_verify_checksum()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_make_checksum(krb5_context context, krb5_cksumtype cksumtype,
                     krb5_key key, krb5_keyusage usage, const krb5_data *input,
                     krb5_checksum *cksum);

/**
 * Fill in a checksum element in IOV array (operates on opaque key)
 *
 * @param [in]     context         Library context
 * @param [in]     cksumtype       Checksum type (0 for mandatory type)
 * @param [in]     key             Encryption key for a keyed checksum
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in,out] data            IOV array
 * @param [in]     num_data        Size of @a data
 *
 * Create a checksum in the #KRB5_CRYPTO_TYPE_CHECKSUM element over
 * #KRB5_CRYPTO_TYPE_DATA and #KRB5_CRYPTO_TYPE_SIGN_ONLY chunks in @a data.
 * Only the #KRB5_CRYPTO_TYPE_CHECKSUM region is modified.
 *
 * @note This function is similar to krb5_c_make_checksum_iov(), but operates
 * on opaque @a key.
 *
 * @sa krb5_k_verify_checksum_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_make_checksum_iov(krb5_context context, krb5_cksumtype cksumtype,
                         krb5_key key, krb5_keyusage usage,
                         krb5_crypto_iov *data, size_t num_data);

/**
 * Verify a checksum (operates on opaque key).
 *
 * @param [in]  context         Library context
 * @param [in]  key             Encryption key for a keyed checksum
 * @param [in]  usage           @a key usage
 * @param [in]  data            Data to be used to compute a new checksum
 *                              using @a key to compare @a cksum against
 * @param [in]  cksum           Checksum to be verified
 * @param [out] valid           Non-zero for success, zero for failure
 *
 * This function verifies that @a cksum is a valid checksum for @a data.  If
 * the checksum type of @a cksum is a keyed checksum, @a key is used to verify
 * the checksum.  If the checksum type in @a cksum is 0 and @a key is not NULL,
 * the mandatory checksum type for @a key will be used.  The actual checksum
 * key will be derived from @a key and @a usage if key derivation is specified
 * for the checksum type.
 *
 * @note This function is similar to krb5_c_verify_checksum(), but operates
 * on opaque @a key.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_verify_checksum(krb5_context context, krb5_key key, krb5_keyusage usage,
                       const krb5_data *data, const krb5_checksum *cksum,
                       krb5_boolean *valid);

/**
 * Validate a checksum element in IOV array (operates on opaque key).
 *
 * @param [in]     context         Library context
 * @param [in]     cksumtype       Checksum type (0 for mandatory type)
 * @param [in]     key             Encryption key for a keyed checksum
 * @param [in]     usage           Key usage (see @ref KRB5_KEYUSAGE types)
 * @param [in]     data            IOV array
 * @param [in]     num_data        Size of @a data
 * @param [out]    valid           Non-zero for success, zero for failure
 *
 * Confirm that the checksum in the #KRB5_CRYPTO_TYPE_CHECKSUM element is a
 * valid checksum of the #KRB5_CRYPTO_TYPE_DATA and #KRB5_CRYPTO_TYPE_SIGN_ONLY
 * regions in the iov.
 *
 * @note This function is similar to krb5_c_verify_checksum_iov(), but operates
 * on opaque @a key.
 *
 * @sa krb5_k_make_checksum_iov()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_verify_checksum_iov(krb5_context context, krb5_cksumtype cksumtype,
                           krb5_key key, krb5_keyusage usage,
                           const krb5_crypto_iov *data, size_t num_data,
                           krb5_boolean *valid);

/**
 * Generate enctype-specific pseudo-random bytes (operates on opaque key).
 *
 * @param [in]  context      Library context
 * @param [in]  key          Key
 * @param [in]  input        Input data
 * @param [out] output       Output data
 *
 * This function selects a pseudo-random function based on @a key and
 * computes its value over @a input, placing the result into @a output.
 * The caller must preinitialize @a output and allocate space for the
 * result.
 *
 * @note This function is similar to krb5_c_prf(), but operates
 * on opaque @a key.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_k_prf(krb5_context context, krb5_key key, krb5_data *input, krb5_data *output);

#ifdef KRB5_OLD_CRYPTO
/*
 * old cryptosystem routine prototypes.  These are now layered
 * on top of the functions above.
 */
/** @deprecated Replaced by krb5_c_* API family.*/
krb5_error_code KRB5_CALLCONV
krb5_encrypt(krb5_context context, krb5_const_pointer inptr,
             krb5_pointer outptr, size_t size, krb5_encrypt_block *eblock,
             krb5_pointer ivec);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_decrypt(krb5_context context, krb5_const_pointer inptr,
             krb5_pointer outptr, size_t size, krb5_encrypt_block *eblock,
             krb5_pointer ivec);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_process_key(krb5_context context, krb5_encrypt_block *eblock,
                 const krb5_keyblock * key);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_finish_key(krb5_context context, krb5_encrypt_block * eblock);

/** @deprecated See krb5_c_string_to_key() */
krb5_error_code KRB5_CALLCONV
krb5_string_to_key(krb5_context context, const krb5_encrypt_block *eblock,
                   krb5_keyblock * keyblock, const krb5_data *data,
                   const krb5_data *salt);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_init_random_key(krb5_context context, const krb5_encrypt_block *eblock,
                     const krb5_keyblock *keyblock, krb5_pointer *ptr);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_finish_random_key(krb5_context context, const krb5_encrypt_block *eblock,
                       krb5_pointer *ptr);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_random_key(krb5_context context, const krb5_encrypt_block *eblock,
                krb5_pointer ptr, krb5_keyblock **keyblock);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_enctype KRB5_CALLCONV
krb5_eblock_enctype(krb5_context context, const krb5_encrypt_block *eblock);

/** @deprecated Replaced by krb5_c_* API family. */
krb5_error_code KRB5_CALLCONV
krb5_use_enctype(krb5_context context, krb5_encrypt_block *eblock,
                 krb5_enctype enctype);

/** @deprecated Replaced by krb5_c_* API family. */
size_t KRB5_CALLCONV
krb5_encrypt_size(size_t length, krb5_enctype crypto);

/** @deprecated See krb5_c_checksum_length() */
size_t KRB5_CALLCONV
krb5_checksum_size(krb5_context context, krb5_cksumtype ctype);

/** @deprecated See krb5_c_make_checksum() */
krb5_error_code KRB5_CALLCONV
krb5_calculate_checksum(krb5_context context, krb5_cksumtype ctype,
                        krb5_const_pointer in, size_t in_length,
                        krb5_const_pointer seed, size_t seed_length,
                        krb5_checksum * outcksum);

/** @deprecated See krb5_c_verify_checksum() */
krb5_error_code KRB5_CALLCONV
krb5_verify_checksum(krb5_context context, krb5_cksumtype ctype,
                     const krb5_checksum * cksum, krb5_const_pointer in,
                     size_t in_length, krb5_const_pointer seed,
                     size_t seed_length);

#endif /* KRB5_OLD_CRYPTO */

/*
 * end "encryption.h"
 */

/*
 * begin "fieldbits.h"
 */

/* kdc_options for kdc_request */
/* options is 32 bits; each host is responsible to put the 4 bytes
   representing these bits into net order before transmission */
/* #define      KDC_OPT_RESERVED        0x80000000 */
#define KDC_OPT_FORWARDABLE             0x40000000
#define KDC_OPT_FORWARDED               0x20000000
#define KDC_OPT_PROXIABLE               0x10000000
#define KDC_OPT_PROXY                   0x08000000
#define KDC_OPT_ALLOW_POSTDATE          0x04000000
#define KDC_OPT_POSTDATED               0x02000000
/* #define      KDC_OPT_UNUSED          0x01000000 */
#define KDC_OPT_RENEWABLE               0x00800000
/* #define      KDC_OPT_UNUSED          0x00400000 */
/* #define      KDC_OPT_RESERVED        0x00200000 */
/* #define      KDC_OPT_RESERVED        0x00100000 */
/* #define      KDC_OPT_RESERVED        0x00080000 */
/* #define      KDC_OPT_RESERVED        0x00040000 */
#define KDC_OPT_CNAME_IN_ADDL_TKT       0x00020000
#define KDC_OPT_CANONICALIZE            0x00010000
#define KDC_OPT_REQUEST_ANONYMOUS       0x00008000
/* #define      KDC_OPT_RESERVED        0x00004000 */
/* #define      KDC_OPT_RESERVED        0x00002000 */
/* #define      KDC_OPT_RESERVED        0x00001000 */
/* #define      KDC_OPT_RESERVED        0x00000800 */
/* #define      KDC_OPT_RESERVED        0x00000400 */
/* #define      KDC_OPT_RESERVED        0x00000200 */
/* #define      KDC_OPT_RESERVED        0x00000100 */
/* #define      KDC_OPT_RESERVED        0x00000080 */
/* #define      KDC_OPT_RESERVED        0x00000040 */
#define KDC_OPT_DISABLE_TRANSITED_CHECK 0x00000020
#define KDC_OPT_RENEWABLE_OK            0x00000010
#define KDC_OPT_ENC_TKT_IN_SKEY         0x00000008
/* #define      KDC_OPT_UNUSED          0x00000004 */
#define KDC_OPT_RENEW                   0x00000002
#define KDC_OPT_VALIDATE                0x00000001

/*
 * Mask of ticket flags in the TGT which should be converted into KDC
 * options when using the TGT to get derivative tickets.
 *
 *  New mask = KDC_OPT_FORWARDABLE | KDC_OPT_PROXIABLE |
 *             KDC_OPT_ALLOW_POSTDATE | KDC_OPT_RENEWABLE
 */
#define KDC_TKT_COMMON_MASK             0x54800000

/* definitions for ap_options fields */

/** @defgroup AP_OPTS AP_OPTS
 *
 * ap_options are 32 bits; each host is responsible to put the 4 bytes
 * representing these bits into net order before transmission
 * @{
 */
#define AP_OPTS_RESERVED           0x80000000
#define AP_OPTS_USE_SESSION_KEY    0x40000000 /**< Use session key */
#define AP_OPTS_MUTUAL_REQUIRED    0x20000000 /**< Perform a mutual
                                                 authentication exchange */
#define AP_OPTS_ETYPE_NEGOTIATION  0x00000002
#define AP_OPTS_USE_SUBKEY         0x00000001 /**< Generate a subsession key
                                                 from the current session key
                                                 obtained from the
                                                 credentials */
/* #define      AP_OPTS_RESERVED        0x10000000 */
/* #define      AP_OPTS_RESERVED        0x08000000 */
/* #define      AP_OPTS_RESERVED        0x04000000 */
/* #define      AP_OPTS_RESERVED        0x02000000 */
/* #define      AP_OPTS_RESERVED        0x01000000 */
/* #define      AP_OPTS_RESERVED        0x00800000 */
/* #define      AP_OPTS_RESERVED        0x00400000 */
/* #define      AP_OPTS_RESERVED        0x00200000 */
/* #define      AP_OPTS_RESERVED        0x00100000 */
/* #define      AP_OPTS_RESERVED        0x00080000 */
/* #define      AP_OPTS_RESERVED        0x00040000 */
/* #define      AP_OPTS_RESERVED        0x00020000 */
/* #define      AP_OPTS_RESERVED        0x00010000 */
/* #define      AP_OPTS_RESERVED        0x00008000 */
/* #define      AP_OPTS_RESERVED        0x00004000 */
/* #define      AP_OPTS_RESERVED        0x00002000 */
/* #define      AP_OPTS_RESERVED        0x00001000 */
/* #define      AP_OPTS_RESERVED        0x00000800 */
/* #define      AP_OPTS_RESERVED        0x00000400 */
/* #define      AP_OPTS_RESERVED        0x00000200 */
/* #define      AP_OPTS_RESERVED        0x00000100 */
/* #define      AP_OPTS_RESERVED        0x00000080 */
/* #define      AP_OPTS_RESERVED        0x00000040 */
/* #define      AP_OPTS_RESERVED        0x00000020 */
/* #define      AP_OPTS_RESERVED        0x00000010 */
/* #define      AP_OPTS_RESERVED        0x00000008 */
/* #define      AP_OPTS_RESERVED        0x00000004 */

#define AP_OPTS_WIRE_MASK               0xfffffff0
/** @} */ /* end of AP_OPTS group */

/* definitions for ad_type fields. */
#define AD_TYPE_RESERVED        0x8000
#define AD_TYPE_EXTERNAL        0x4000
#define AD_TYPE_REGISTERED      0x2000

#define AD_TYPE_FIELD_TYPE_MASK 0x1fff

/* Ticket flags */
/* flags are 32 bits; each host is responsible to put the 4 bytes
   representing these bits into net order before transmission */
/* #define      TKT_FLG_RESERVED        0x80000000 */
#define TKT_FLG_FORWARDABLE             0x40000000
#define TKT_FLG_FORWARDED               0x20000000
#define TKT_FLG_PROXIABLE               0x10000000
#define TKT_FLG_PROXY                   0x08000000
#define TKT_FLG_MAY_POSTDATE            0x04000000
#define TKT_FLG_POSTDATED               0x02000000
#define TKT_FLG_INVALID                 0x01000000
#define TKT_FLG_RENEWABLE               0x00800000
#define TKT_FLG_INITIAL                 0x00400000
#define TKT_FLG_PRE_AUTH                0x00200000
#define TKT_FLG_HW_AUTH                 0x00100000
#define TKT_FLG_TRANSIT_POLICY_CHECKED  0x00080000
#define TKT_FLG_OK_AS_DELEGATE          0x00040000
#define TKT_FLG_ENC_PA_REP              0x00010000
#define TKT_FLG_ANONYMOUS               0x00008000
/* #define      TKT_FLG_RESERVED        0x00004000 */
/* #define      TKT_FLG_RESERVED        0x00002000 */
/* #define      TKT_FLG_RESERVED        0x00001000 */
/* #define      TKT_FLG_RESERVED        0x00000800 */
/* #define      TKT_FLG_RESERVED        0x00000400 */
/* #define      TKT_FLG_RESERVED        0x00000200 */
/* #define      TKT_FLG_RESERVED        0x00000100 */
/* #define      TKT_FLG_RESERVED        0x00000080 */
/* #define      TKT_FLG_RESERVED        0x00000040 */
/* #define      TKT_FLG_RESERVED        0x00000020 */
/* #define      TKT_FLG_RESERVED        0x00000010 */
/* #define      TKT_FLG_RESERVED        0x00000008 */
/* #define      TKT_FLG_RESERVED        0x00000004 */
/* #define      TKT_FLG_RESERVED        0x00000002 */
/* #define      TKT_FLG_RESERVED        0x00000001 */

/* definitions for lr_type fields. */
#define LR_TYPE_THIS_SERVER_ONLY        0x8000

#define LR_TYPE_INTERPRETATION_MASK     0x7fff

/* definitions for msec direction bit for KRB_SAFE, KRB_PRIV */
#define MSEC_DIRBIT             0x8000
#define MSEC_VAL_MASK           0x7fff

/*
 * end "fieldbits.h"
 */

/*
 * begin "proto.h"
 */

/** Protocol version number */
#define KRB5_PVNO       5

/* Message types */

#define KRB5_AS_REQ   ((krb5_msgtype)10) /**< Initial authentication request */
#define KRB5_AS_REP   ((krb5_msgtype)11) /**< Response to AS request */
#define KRB5_TGS_REQ  ((krb5_msgtype)12) /**< Ticket granting server request */
#define KRB5_TGS_REP  ((krb5_msgtype)13) /**< Response to TGS request */
#define KRB5_AP_REQ   ((krb5_msgtype)14) /**< Auth req to application server */
#define KRB5_AP_REP   ((krb5_msgtype)15) /**< Response to mutual AP request */
#define KRB5_SAFE     ((krb5_msgtype)20) /**< Safe application message */
#define KRB5_PRIV     ((krb5_msgtype)21) /**< Private application message */
#define KRB5_CRED     ((krb5_msgtype)22) /**< Cred forwarding message */
#define KRB5_ERROR    ((krb5_msgtype)30) /**< Error response */

/* LastReq types */
#define KRB5_LRQ_NONE                   0
#define KRB5_LRQ_ALL_LAST_TGT           1
#define KRB5_LRQ_ONE_LAST_TGT           (-1)
#define KRB5_LRQ_ALL_LAST_INITIAL       2
#define KRB5_LRQ_ONE_LAST_INITIAL       (-2)
#define KRB5_LRQ_ALL_LAST_TGT_ISSUED    3
#define KRB5_LRQ_ONE_LAST_TGT_ISSUED    (-3)
#define KRB5_LRQ_ALL_LAST_RENEWAL       4
#define KRB5_LRQ_ONE_LAST_RENEWAL       (-4)
#define KRB5_LRQ_ALL_LAST_REQ           5
#define KRB5_LRQ_ONE_LAST_REQ           (-5)
#define KRB5_LRQ_ALL_PW_EXPTIME         6
#define KRB5_LRQ_ONE_PW_EXPTIME         (-6)
#define KRB5_LRQ_ALL_ACCT_EXPTIME       7
#define KRB5_LRQ_ONE_ACCT_EXPTIME       (-7)

/* PADATA types */
#define KRB5_PADATA_NONE                0
#define KRB5_PADATA_AP_REQ              1
#define KRB5_PADATA_TGS_REQ             KRB5_PADATA_AP_REQ
#define KRB5_PADATA_ENC_TIMESTAMP       2 /**< RFC 4120 */
#define KRB5_PADATA_PW_SALT             3 /**< RFC 4120 */
#if 0                           /* Not used */
#define KRB5_PADATA_ENC_ENCKEY          4  /* Key encrypted within itself */
#endif
#define KRB5_PADATA_ENC_UNIX_TIME       5  /**< timestamp encrypted in key. RFC 4120 */
#define KRB5_PADATA_ENC_SANDIA_SECURID  6  /**< SecurId passcode. RFC 4120 */
#define KRB5_PADATA_SESAME              7  /**< Sesame project. RFC 4120 */
#define KRB5_PADATA_OSF_DCE             8  /**< OSF DCE. RFC 4120 */
#define KRB5_CYBERSAFE_SECUREID         9  /**< Cybersafe. RFC 4120 */
#define KRB5_PADATA_AFS3_SALT           10 /**< Cygnus. RFC 4120, 3961 */
#define KRB5_PADATA_ETYPE_INFO          11 /**< Etype info for preauth. RFC 4120 */
#define KRB5_PADATA_SAM_CHALLENGE       12 /**< SAM/OTP */
#define KRB5_PADATA_SAM_RESPONSE        13 /**< SAM/OTP */
#define KRB5_PADATA_PK_AS_REQ_OLD       14 /**< PKINIT */
#define KRB5_PADATA_PK_AS_REP_OLD       15 /**< PKINIT */
#define KRB5_PADATA_PK_AS_REQ           16 /**< PKINIT. RFC 4556 */
#define KRB5_PADATA_PK_AS_REP           17 /**< PKINIT. RFC 4556 */
#define KRB5_PADATA_ETYPE_INFO2         19 /**< RFC 4120 */
#define KRB5_PADATA_USE_SPECIFIED_KVNO  20 /**< RFC 4120 */
#define KRB5_PADATA_SVR_REFERRAL_INFO   20 /**< Windows 2000 referrals. RFC 6820 */
#define KRB5_PADATA_SAM_REDIRECT        21 /**< SAM/OTP. RFC 4120 */
#define KRB5_PADATA_GET_FROM_TYPED_DATA 22 /**< Embedded in typed data. RFC 4120 */
#define KRB5_PADATA_REFERRAL            25 /**< draft referral system */
#define KRB5_PADATA_SAM_CHALLENGE_2     30 /**< draft challenge system, updated */
#define KRB5_PADATA_SAM_RESPONSE_2      31 /**< draft challenge system, updated */
/* MS-KILE */
#define KRB5_PADATA_PAC_REQUEST         128 /**< include Windows PAC */
#define KRB5_PADATA_FOR_USER            129 /**< username protocol transition request */
#define KRB5_PADATA_S4U_X509_USER       130 /**< certificate protocol transition request */
#define KRB5_PADATA_AS_CHECKSUM         132 /**< AS checksum */
#define KRB5_PADATA_FX_COOKIE           133 /**< RFC 6113 */
#define KRB5_PADATA_FX_FAST             136 /**< RFC 6113 */
#define KRB5_PADATA_FX_ERROR            137 /**< RFC 6113 */
#define KRB5_PADATA_ENCRYPTED_CHALLENGE 138 /**< RFC 6113 */
#define KRB5_PADATA_OTP_CHALLENGE       141 /**< RFC 6560 section 4.1 */
#define KRB5_PADATA_OTP_REQUEST         142 /**< RFC 6560 section 4.2 */
#define KRB5_PADATA_OTP_PIN_CHANGE      144 /**< RFC 6560 section 4.3 */
#define KRB5_PADATA_PKINIT_KX           147 /**< RFC 6112 */
#define KRB5_ENCPADATA_REQ_ENC_PA_REP   149 /**< RFC 6806 */
#define KRB5_PADATA_AS_FRESHNESS        150 /**< RFC 8070 */
#define KRB5_PADATA_SPAKE               151
#define KRB5_PADATA_REDHAT_IDP_OAUTH2   152 /**< Red Hat IdP mechanism */
#define KRB5_PADATA_REDHAT_PASSKEY      153 /**< Red Hat Passkey mechanism */
#define KRB5_PADATA_PAC_OPTIONS         167 /**< MS-KILE and MS-SFU */

#define KRB5_SAM_USE_SAD_AS_KEY         0x80000000
#define KRB5_SAM_SEND_ENCRYPTED_SAD     0x40000000
#define KRB5_SAM_MUST_PK_ENCRYPT_SAD    0x20000000 /**< currently must be zero */

/** Transited encoding types */
#define KRB5_DOMAIN_X500_COMPRESS               1

/** alternate authentication types */
#define KRB5_ALTAUTH_ATT_CHALLENGE_RESPONSE     64

/* authorization data types. See RFC 4120 section 5.2.6 */

/** @defgroup KRB5_AUTHDATA KRB5_AUTHDATA
 * @{
 */
#define KRB5_AUTHDATA_IF_RELEVANT   1
#define KRB5_AUTHDATA_KDC_ISSUED    4
#define KRB5_AUTHDATA_AND_OR        5
#define KRB5_AUTHDATA_MANDATORY_FOR_KDC 8
#define KRB5_AUTHDATA_INITIAL_VERIFIED_CAS      9
#define KRB5_AUTHDATA_OSF_DCE   64
#define KRB5_AUTHDATA_SESAME    65
#define KRB5_AUTHDATA_CAMMAC    96
#define KRB5_AUTHDATA_WIN2K_PAC 128
#define KRB5_AUTHDATA_ETYPE_NEGOTIATION 129     /**< RFC 4537 */
#define KRB5_AUTHDATA_SIGNTICKET        512     /**< @deprecated use PAC */
#define KRB5_AUTHDATA_FX_ARMOR 71
#define KRB5_AUTHDATA_AUTH_INDICATOR 97
#define KRB5_AUTHDATA_AP_OPTIONS 143
/** @} */ /* end of KRB5_AUTHDATA group */

/* password change constants */
#define KRB5_KPASSWD_SUCCESS            0  /**< Success */
#define KRB5_KPASSWD_MALFORMED          1  /**< Malformed request */
#define KRB5_KPASSWD_HARDERROR          2  /**< Server error */
#define KRB5_KPASSWD_AUTHERROR          3  /**< Authentication error */
#define KRB5_KPASSWD_SOFTERROR          4  /**< Password change rejected */
/* These are Microsoft's extensions in RFC 3244, and it looks like
   they'll become standardized, possibly with other additions.  */
#define KRB5_KPASSWD_ACCESSDENIED       5  /**< Not authorized */
#define KRB5_KPASSWD_BAD_VERSION        6  /**< Unknown RPC version */
/** The presented credentials were not obtained using a password directly */
#define KRB5_KPASSWD_INITIAL_FLAG_NEEDED 7

/*
 * end "proto.h"
 */

/* Time set */
/** Ticket start time, end time, and renewal duration. */
typedef struct _krb5_ticket_times {
    krb5_timestamp authtime;    /**< Time at which KDC issued the initial ticket that corresponds to this ticket */
    /* XXX ? should ktime in KDC_REP == authtime
       in ticket? otherwise client can't get this */
    krb5_timestamp starttime;   /**< optional in ticket, if not present, use @a authtime */
    krb5_timestamp endtime;     /**< Ticket expiration time */
    krb5_timestamp renew_till;  /**< Latest time at which renewal of ticket can be valid */
} krb5_ticket_times;

/** Structure for auth data */
typedef struct _krb5_authdata {
    krb5_magic magic;
    krb5_authdatatype ad_type; /**< ADTYPE */
    unsigned int length;       /**< Length of data */
    krb5_octet *contents;      /**< Data */
} krb5_authdata;

/** Structure for transited encoding */
typedef struct _krb5_transited {
    krb5_magic magic;
    krb5_octet tr_type;     /**< Transited encoding type */
    krb5_data tr_contents;  /**< Contents */
} krb5_transited;

/** Encrypted part of ticket. */
typedef struct _krb5_enc_tkt_part {
    krb5_magic magic;
    /* to-be-encrypted portion */
    krb5_flags flags;                   /**< flags */
    krb5_keyblock *session;             /**< session key: includes enctype */
    krb5_principal client;              /**< client name/realm */
    krb5_transited transited;           /**< list of transited realms */
    krb5_ticket_times times;            /**< auth, start, end, renew_till */
    krb5_address **caddrs;              /**< array of ptrs to addresses */
    krb5_authdata **authorization_data; /**< auth data */
} krb5_enc_tkt_part;

/**
 * Ticket structure.
 *
 * The C representation of the ticket message, with a pointer to the
 * C representation of the encrypted part.
 */
typedef struct _krb5_ticket {
    krb5_magic magic;
    /* cleartext portion */
    krb5_principal server;              /**< server name/realm */
    krb5_enc_data enc_part;             /**< encryption type, kvno, encrypted encoding */
    krb5_enc_tkt_part *enc_part2;       /**< ptr to decrypted version, if available */
} krb5_ticket;

/* the unencrypted version */
/**
 * Ticket authenticator.
 *
 * The C representation of an unencrypted authenticator.
 */
typedef struct _krb5_authenticator {
    krb5_magic magic;
    krb5_principal client;              /**< client name/realm */
    krb5_checksum *checksum;            /**< checksum, includes type, optional */
    krb5_int32 cusec;                   /**< client usec portion */
    krb5_timestamp ctime;               /**< client sec portion */
    krb5_keyblock *subkey;              /**< true session key, optional */
    krb5_ui_4 seq_number;               /**< sequence #, optional */
    krb5_authdata **authorization_data; /**< authoriazation data */
} krb5_authenticator;

/** Ticket authentication data. */
typedef struct _krb5_tkt_authent {
    krb5_magic magic;
    krb5_ticket *ticket;
    krb5_authenticator *authenticator;
    krb5_flags ap_options;
} krb5_tkt_authent;

/** Credentials structure including ticket, session key, and lifetime info. */
typedef struct _krb5_creds {
    krb5_magic magic;
    krb5_principal client;              /**< client's principal identifier */
    krb5_principal server;              /**< server's principal identifier */
    krb5_keyblock keyblock;             /**< session encryption key info */
    krb5_ticket_times times;            /**< lifetime info */
    krb5_boolean is_skey;               /**< true if ticket is encrypted in
                                           another ticket's skey */
    krb5_flags ticket_flags;            /**< flags in ticket */
    krb5_address **addresses;           /**< addrs in ticket */
    krb5_data ticket;                   /**< ticket string itself */
    krb5_data second_ticket;            /**< second ticket, if related to
                                           ticket (via DUPLICATE-SKEY or
                                           ENC-TKT-IN-SKEY) */
    krb5_authdata **authdata;           /**< authorization data */
} krb5_creds;

/** Last request entry */
typedef struct _krb5_last_req_entry {
    krb5_magic magic;
    krb5_int32 lr_type;         /**< LR type */
    krb5_timestamp value;       /**< Timestamp */
} krb5_last_req_entry;

/** Pre-authentication data */
typedef struct _krb5_pa_data {
    krb5_magic magic;
    krb5_preauthtype pa_type;   /**< Preauthentication data type */
    unsigned int length;        /**< Length of data */
    krb5_octet *contents;       /**< Data */
} krb5_pa_data;

/* Don't use this; use krb5_pa_data instead. */
typedef struct _krb5_typed_data {
    krb5_magic magic;
    krb5_int32 type;
    unsigned int length;
    krb5_octet *data;
} krb5_typed_data;

/** C representation of KDC-REQ protocol message, including KDC-REQ-BODY */
typedef struct _krb5_kdc_req {
    krb5_magic magic;
    krb5_msgtype msg_type;      /**< KRB5_AS_REQ or KRB5_TGS_REQ */
    krb5_pa_data **padata;      /**< Preauthentication data */
    /* real body */
    krb5_flags kdc_options;     /**< Requested options */
    krb5_principal client;      /**< Client principal and realm */
    krb5_principal server;      /**< Server principal and realm */
    krb5_timestamp from;        /**< Requested start time */
    krb5_timestamp till;        /**< Requested end time */
    krb5_timestamp rtime;       /**< Requested renewable end time */
    krb5_int32 nonce;           /**< Nonce to match request and response */
    int nktypes;                /**< Number of enctypes */
    krb5_enctype *ktype;        /**< Requested enctypes */
    krb5_address **addresses;   /**< Requested addresses (optional) */
    krb5_enc_data authorization_data;  /**< Encrypted authz data (optional) */
    krb5_authdata **unenc_authdata;    /**< Unencrypted authz data */
    krb5_ticket **second_ticket;       /**< Second ticket array (optional) */
} krb5_kdc_req;

/**
 * C representation of @c EncKDCRepPart protocol message.
 *
 * This is the cleartext message that is encrypted and inserted in @c KDC-REP.
 */
typedef struct _krb5_enc_kdc_rep_part {
    krb5_magic magic;
    /* encrypted part: */
    krb5_msgtype msg_type;           /**< krb5 message type */
    krb5_keyblock *session;          /**< Session key */
    krb5_last_req_entry **last_req;  /**< Array of pointers to entries */
    krb5_int32 nonce;                /**< Nonce from request */
    krb5_timestamp key_exp;          /**< Expiration date */
    krb5_flags flags;                /**< Ticket flags */
    krb5_ticket_times times;         /**< Lifetime info */
    krb5_principal server;           /**< Server's principal identifier */
    krb5_address **caddrs;           /**< Array of ptrs to addrs, optional */
    krb5_pa_data **enc_padata;       /**< Encrypted preauthentication data */
} krb5_enc_kdc_rep_part;

/** Representation of the @c KDC-REP protocol message. */
typedef struct _krb5_kdc_rep {
    krb5_magic magic;
    /* cleartext part: */
    krb5_msgtype msg_type;            /**< KRB5_AS_REP or KRB5_KDC_REP */
    krb5_pa_data **padata;            /**< Preauthentication data from KDC */
    krb5_principal client;            /**< Client principal and realm */
    krb5_ticket *ticket;              /**< Ticket */
    krb5_enc_data enc_part;           /**< Encrypted part of reply */
    krb5_enc_kdc_rep_part *enc_part2; /**< Unencrypted version, if available */
} krb5_kdc_rep;

/** Error message structure */
typedef struct _krb5_error {
    krb5_magic magic;
    /* some of these may be meaningless in certain contexts */
    krb5_timestamp ctime;       /**< Client sec portion; optional */
    krb5_int32 cusec;           /**< Client usec portion; optional */
    krb5_int32 susec;           /**< Server usec portion */
    krb5_timestamp stime;       /**< Server sec portion */
    krb5_ui_4 error;            /**< Error code (protocol error #'s) */
    krb5_principal client;      /**< Client principal and realm */
    krb5_principal server;      /**< Server principal and realm */
    krb5_data text;             /**< Descriptive text */
    krb5_data e_data;           /**< Additional error-describing data */
} krb5_error;

/** Authentication header. */
typedef struct _krb5_ap_req {
    krb5_magic magic;
    krb5_flags ap_options;        /**< Requested options */
    krb5_ticket *ticket;          /**< Ticket */
    krb5_enc_data authenticator;  /**< Encrypted authenticator */
} krb5_ap_req;

/**
 * C representaton of AP-REP message.
 *
 * The server's response to a client's request for mutual authentication.
 */
typedef struct _krb5_ap_rep {
    krb5_magic magic;
    krb5_enc_data enc_part;     /**< Ciphertext of ApRepEncPart */
} krb5_ap_rep;

/** Cleartext that is encrypted and put into @c _krb5_ap_rep. */
typedef struct _krb5_ap_rep_enc_part {
    krb5_magic magic;
    krb5_timestamp ctime;       /**< Client time, seconds portion */
    krb5_int32 cusec;           /**< Client time, microseconds portion */
    krb5_keyblock *subkey;      /**< Subkey (optional) */
    krb5_ui_4 seq_number;       /**< Sequence number */
} krb5_ap_rep_enc_part;

/* Unused */
typedef struct _krb5_response {
    krb5_magic magic;
    krb5_octet message_type;
    krb5_data response;
    krb5_int32 expected_nonce;
    krb5_timestamp request_time;
} krb5_response;

/** Credentials information inserted into @c EncKrbCredPart. */
typedef struct _krb5_cred_info {
    krb5_magic magic;
    krb5_keyblock *session;     /**< Session key used to encrypt ticket */
    krb5_principal client;      /**< Client principal and realm */
    krb5_principal server;      /**< Server principal and realm */
    krb5_flags flags;           /**< Ticket flags */
    krb5_ticket_times times;    /**< Auth, start, end, renew_till */
    krb5_address **caddrs;      /**< Array of pointers to addrs (optional) */
} krb5_cred_info;

/** Cleartext credentials information. */
typedef struct _krb5_cred_enc_part {
    krb5_magic magic;
    krb5_int32 nonce;           /**< Nonce (optional) */
    krb5_timestamp timestamp;   /**< Generation time, seconds portion */
    krb5_int32 usec;            /**< Generation time, microseconds portion */
    krb5_address *s_address;    /**< Sender address (optional) */
    krb5_address *r_address;    /**< Recipient address (optional) */
    krb5_cred_info **ticket_info;
} krb5_cred_enc_part;

/** Credentials data structure.*/
typedef struct _krb5_cred {
    krb5_magic magic;
    krb5_ticket **tickets;          /**< Tickets */
    krb5_enc_data enc_part;         /**< Encrypted part */
    krb5_cred_enc_part *enc_part2;  /**< Unencrypted version, if available */
} krb5_cred;

/* Unused, but here for API compatibility. */
typedef struct _passwd_phrase_element {
    krb5_magic magic;
    krb5_data *passwd;
    krb5_data *phrase;
} passwd_phrase_element;

/* Unused, but here for API compatibility. */
typedef struct _krb5_pwd_data {
    krb5_magic magic;
    int sequence_count;
    passwd_phrase_element **element;
} krb5_pwd_data;

/* Unused, but here for API compatibility. */
typedef struct _krb5_pa_svr_referral_data {
    /** Referred name, only realm is required */
    krb5_principal     principal;
} krb5_pa_svr_referral_data;

/* Unused, but here for API compatibility. */
typedef struct _krb5_pa_server_referral_data {
    krb5_data          *referred_realm;
    krb5_principal     true_principal_name;
    krb5_principal     requested_principal_name;
    krb5_timestamp     referral_valid_until;
    krb5_checksum      rep_cksum;
} krb5_pa_server_referral_data;

typedef struct _krb5_pa_pac_req {
    /** TRUE if a PAC should be included in TGS-REP */
    krb5_boolean       include_pac;
} krb5_pa_pac_req;

/*
 * begin "safepriv.h"
 */

/** @defgroup KRB5_AUTH_CONTEXT KRB5_AUTH_CONTEXT
 * @{
 */
/** Prevent replays with timestamps and replay cache. */
#define KRB5_AUTH_CONTEXT_DO_TIME       0x00000001
/** Save timestamps for application. */
#define KRB5_AUTH_CONTEXT_RET_TIME      0x00000002
/** Prevent replays with sequence numbers. */
#define KRB5_AUTH_CONTEXT_DO_SEQUENCE   0x00000004
/** Save sequence numbers for application. */
#define KRB5_AUTH_CONTEXT_RET_SEQUENCE  0x00000008
#define KRB5_AUTH_CONTEXT_PERMIT_ALL    0x00000010
#define KRB5_AUTH_CONTEXT_USE_SUBKEY    0x00000020
/** @} */ /* end of KRB5_AUTH_CONTEXT group */

/**
 * Replay data.
 *
 * Sequence number and timestamp information output by krb5_rd_priv() and
 * krb5_rd_safe().
 */
typedef struct krb5_replay_data {
    krb5_timestamp      timestamp;  /**< Timestamp, seconds portion */
    krb5_int32          usec;       /**< Timestamp, microseconds portion */
    krb5_ui_4           seq;        /**< Sequence number */
} krb5_replay_data;

/* Flags for krb5_auth_con_genaddrs(). */

/** Generate the local network address. */
#define KRB5_AUTH_CONTEXT_GENERATE_LOCAL_ADDR       0x00000001
/** Generate the remote network address. */
#define KRB5_AUTH_CONTEXT_GENERATE_REMOTE_ADDR      0x00000002
/** Generate the local network address and the local port. */
#define KRB5_AUTH_CONTEXT_GENERATE_LOCAL_FULL_ADDR  0x00000004
/** Generate the remote network address and the remote port. */
#define KRB5_AUTH_CONTEXT_GENERATE_REMOTE_FULL_ADDR 0x00000008

/** Type of function used as a callback to generate checksum data for mk_req */
typedef krb5_error_code
(KRB5_CALLCONV * krb5_mk_req_checksum_func)(krb5_context, krb5_auth_context,
                                            void *, krb5_data **);

/*
 * end "safepriv.h"
 */

/*
 * begin "ccache.h"
 */

/** Cursor for sequential lookup */
typedef krb5_pointer    krb5_cc_cursor;

struct _krb5_ccache;
typedef struct _krb5_ccache *krb5_ccache;
struct _krb5_cc_ops;
typedef struct _krb5_cc_ops krb5_cc_ops;

struct _krb5_cccol_cursor;
/** Cursor for iterating over all ccaches */
typedef struct _krb5_cccol_cursor *krb5_cccol_cursor;

/* Flags for krb5_cc_retrieve_cred. */
/** The requested lifetime must be at least as great as the time specified. */
#define KRB5_TC_MATCH_TIMES        0x00000001
/** The is_skey field must match exactly. */
#define KRB5_TC_MATCH_IS_SKEY      0x00000002
/** All the flags set in the match credentials must be set. */
#define KRB5_TC_MATCH_FLAGS        0x00000004
/** All the time fields must match exactly. */
#define KRB5_TC_MATCH_TIMES_EXACT  0x00000008
/** All the flags must match exactly. */
#define KRB5_TC_MATCH_FLAGS_EXACT  0x00000010
/** The authorization data must match. */
#define KRB5_TC_MATCH_AUTHDATA     0x00000020
/** Only the name portion of the principal name must match. */
#define KRB5_TC_MATCH_SRV_NAMEONLY 0x00000040
/** The second ticket must match. */
#define KRB5_TC_MATCH_2ND_TKT      0x00000080
/** The encryption key type must match. */
#define KRB5_TC_MATCH_KTYPE        0x00000100
/** The supported key types must match. */
#define KRB5_TC_SUPPORTED_KTYPES   0x00000200

/* Flags for krb5_cc_set_flags and similar. */
/** Open and close the file for each cache operation. */
#define KRB5_TC_OPENCLOSE          0x00000001 /**< @deprecated has no effect */
#define KRB5_TC_NOTICKET           0x00000002

/**
 * Retrieve the name, but not type of a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 *
 * @warning Returns the name of the credential cache.  The result is an alias
 * into @a cache and should not be freed or modified by the caller.  This name
 * does not include the cache type, so should not be used as input to
 * krb5_cc_resolve().
 *
 * @return
 * On success - the name of the credential cache.
 */
const char * KRB5_CALLCONV
krb5_cc_get_name(krb5_context context, krb5_ccache cache);

/**
 * Retrieve the full name of a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  cache           Credential cache handle
 * @param [out] fullname_out    Full name of cache
 *
 * Use krb5_free_string() to free @a fullname_out when it is no longer needed.
 *
 * @version New in 1.10
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_get_full_name(krb5_context context, krb5_ccache cache,
                      char **fullname_out);

#if KRB5_DEPRECATED
krb5_error_code KRB5_CALLCONV
krb5_cc_gen_new(krb5_context context, krb5_ccache *cache);
#endif /* KRB5_DEPRECATED */

/**
 * Initialize a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 * @param [in] principal        Default principal name
 *
 * Destroy any existing contents of @a cache and initialize it for the default
 * principal @a principal.
 *
 * @retval
 *  0  Success
 * @return
 *  System errors; Permission errors; Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_initialize(krb5_context context, krb5_ccache cache,
                   krb5_principal principal);

/**
 * Destroy a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 *
 * This function destroys any existing contents of @a cache and closes the
 * handle to it.
 *
 * @retval
 * 0  Success
 * @return
 * Permission errors
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_destroy(krb5_context context, krb5_ccache cache);

/**
 * Close a credential cache handle.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 *
 * This function closes a credential cache handle @a cache without affecting
 * the contents of the cache.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_close(krb5_context context, krb5_ccache cache);

/**
 * Store credentials in a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 * @param [in] creds            Credentials to be stored in cache
 *
 * This function stores @a creds into @a cache.  If @a creds->server and the
 * server in the decoded ticket @a creds->ticket differ, the credentials will
 * be stored under both server principal names.
 *
 * @retval
 *  0  Success
 * @return Permission errors; storage failure errors; Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_store_cred(krb5_context context, krb5_ccache cache, krb5_creds *creds);

/**
 * Retrieve a specified credentials from a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  cache           Credential cache handle
 * @param [in]  flags           Flags bit mask
 * @param [in]  mcreds          Credentials to match
 * @param [out] creds           Credentials matching the requested value
 *
 * This function searches a credential cache for credentials matching @a mcreds
 * and returns it if found.
 *
 * Valid values for @a flags are:
 *
 * @li #KRB5_TC_MATCH_TIMES        The requested lifetime must be at least as
 *                                 great as in @a mcreds .
 * @li #KRB5_TC_MATCH_IS_SKEY      The @a is_skey field much match exactly.
 * @li #KRB5_TC_MATCH_FLAGS        Flags set in @a mcreds must be set.
 * @li #KRB5_TC_MATCH_TIMES_EXACT  The requested lifetime must match exactly.
 * @li #KRB5_TC_MATCH_FLAGS_EXACT  Flags must match exactly.
 * @li #KRB5_TC_MATCH_AUTHDATA     The authorization data must match.
 * @li #KRB5_TC_MATCH_SRV_NAMEONLY Only the name portion of the principal
 *                                 name must match, not the realm.
 * @li #KRB5_TC_MATCH_2ND_TKT      The second tickets must match.
 * @li #KRB5_TC_MATCH_KTYPE        The encryption key types must match.
 * @li #KRB5_TC_SUPPORTED_KTYPES   Check all matching entries that have any
 *                                 supported encryption type and return the
 *                                 one with the encryption type listed earliest.
 *
 * Use krb5_free_cred_contents() to free @a creds when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_retrieve_cred(krb5_context context, krb5_ccache cache,
                      krb5_flags flags, krb5_creds *mcreds,
                      krb5_creds *creds);

/**
 * Get the default principal of a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  cache           Credential cache handle
 * @param [out] principal       Primary principal
 *
 * Returns the default client principal of a credential cache as set by
 * krb5_cc_initialize().
 *
 * Use krb5_free_principal() to free @a principal when it is no longer needed.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_get_principal(krb5_context context, krb5_ccache cache,
                      krb5_principal *principal);

/**
 * Prepare to sequentially read every credential in a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  cache           Credential cache handle
 * @param [out] cursor          Cursor
 *
 * krb5_cc_end_seq_get() must be called to complete the retrieve operation.
 *
 * @note If the cache represented by @a cache is modified between the time of
 * the call to this function and the time of the final krb5_cc_end_seq_get(),
 * these changes may not be reflected in the results of krb5_cc_next_cred()
 * calls.
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_start_seq_get(krb5_context context, krb5_ccache cache,
                      krb5_cc_cursor *cursor);

/**
 * Retrieve the next entry from the credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  cache           Credential cache handle
 * @param [in]  cursor          Cursor
 * @param [out] creds           Next credential cache entry
 *
 * This function fills in @a creds with the next entry in @a cache and advances
 * @a cursor.
 *
 * Use krb5_free_cred_contents() to free @a creds when it is no longer needed.
 *
 * @sa krb5_cc_start_seq_get(), krb5_end_seq_get()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_next_cred(krb5_context context, krb5_ccache cache,
                  krb5_cc_cursor *cursor, krb5_creds *creds);

/**
 * Finish a series of sequential processing credential cache entries.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 * @param [in] cursor           Cursor
 *
 * This function finishes processing credential cache entries and invalidates
 * @a cursor.
 *
 * @sa krb5_cc_start_seq_get(), krb5_cc_next_cred()
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_end_seq_get(krb5_context context, krb5_ccache cache,
                    krb5_cc_cursor *cursor);

/**
 * Remove credentials from a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 * @param [in] flags            Bitwise-ORed search flags
 * @param [in] creds            Credentials to be matched
 *
 * @warning This function is not implemented for some cache types.
 *
 * This function accepts the same flag values as krb5_cc_retrieve_cred().
 *
 * @retval KRB5_CC_NOSUPP Not implemented for this cache type
 * @return No matches found; Data cannot be deleted; Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_remove_cred(krb5_context context, krb5_ccache cache, krb5_flags flags,
                    krb5_creds *creds);

/**
 * Set options flags on a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 * @param [in] flags            Flag bit mask
 *
 * This function resets @a cache flags to @a flags.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_set_flags(krb5_context context, krb5_ccache cache, krb5_flags flags);

/**
 * Retrieve flags from a credential cache structure.
 *
 * @param [in]  context         Library context
 * @param [in]  cache           Credential cache handle
 * @param [out] flags           Flag bit mask
 *
 * @warning For memory credential cache always returns a flag mask of 0.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_get_flags(krb5_context context, krb5_ccache cache, krb5_flags *flags);

/**
 * Retrieve the type of a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 *
 * @return The type of a credential cache as an alias that must not be modified
 * or freed by the caller.
 */
const char * KRB5_CALLCONV
krb5_cc_get_type(krb5_context context, krb5_ccache cache);

/**
 * Move a credential cache.
 *
 * @param [in] context          Library context
 * @param [in] src              The credential cache to move the content from
 * @param [in] dst              The credential cache to move the content to
 *
 * This function reinitializes @a dst and populates it with the credentials and
 * default principal of @a src; then, if successful, destroys @a src.
 *
 * @retval
 * 0 Success; @a src is closed.
 * @return
 * Kerberos error codes; @a src is still allocated.
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_move(krb5_context context, krb5_ccache src, krb5_ccache dst);

/**
 * Prepare to iterate over the collection of known credential caches.
 *
 * @param [in]  context         Library context
 * @param [out] cursor          Cursor
 *
 * Get a new cache iteration @a cursor that will iterate over all known
 * credential caches independent of type.
 *
 * Use krb5_cccol_cursor_free() to release @a cursor when it is no longer
 * needed.
 *
 * @sa krb5_cccol_cursor_next()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cccol_cursor_new(krb5_context context, krb5_cccol_cursor *cursor);

/**
 * Get the next credential cache in the collection.
 *
 * @param [in]  context         Library context
 * @param [in]  cursor          Cursor
 * @param [out] ccache          Credential cache handle
 *
 * @note When all caches are iterated over and the end of the list is reached,
 * @a ccache is set to NULL.
 *
 * Use krb5_cc_close() to close @a ccache when it is no longer needed.
 *
 * @sa krb5_cccol_cursor_new(), krb5_cccol_cursor_free()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cccol_cursor_next(krb5_context context, krb5_cccol_cursor cursor,
                       krb5_ccache *ccache);

/**
 * Free a credential cache collection cursor.
 *
 * @param [in] context          Library context
 * @param [in] cursor           Cursor
 *
 * @sa krb5_cccol_cursor_new(), krb5_cccol_cursor_next()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cccol_cursor_free(krb5_context context, krb5_cccol_cursor *cursor);

/**
 * Check if the credential cache collection contains any initialized caches.
 *
 * @param [in]  context         Library context
 *
 * @version New in 1.11
 *
 * @retval 0 At least one initialized cache is present in the collection
 * @retval KRB5_CC_NOTFOUND The collection contains no caches
 */
krb5_error_code KRB5_CALLCONV
krb5_cccol_have_content(krb5_context context);

/**
 * Create a new credential cache of the specified type with a unique name.
 *
 * @param [in]  context         Library context
 * @param [in]  type            Credential cache type name
 * @param [in]  hint            Unused
 * @param [out] id              Credential cache handle
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_new_unique(krb5_context context, const char *type, const char *hint,
                   krb5_ccache *id);

/*
 * end "ccache.h"
 */

/*
 * begin "rcache.h"
 */

struct krb5_rc_st;
typedef struct krb5_rc_st *krb5_rcache;

/*
 * end "rcache.h"
 */

/*
 * begin "keytab.h"
 */

/* XXX */
#define MAX_KEYTAB_NAME_LEN 1100 /**< Long enough for MAXPATHLEN + some extra */

typedef krb5_pointer krb5_kt_cursor;

/** A key table entry. */
typedef struct krb5_keytab_entry_st {
    krb5_magic magic;
    krb5_principal principal;   /**< Principal of this key */
    krb5_timestamp timestamp;   /**< Time entry written to keytable */
    krb5_kvno vno;              /**< Key version number */
    krb5_keyblock key;          /**< The secret key */
} krb5_keytab_entry;

struct _krb5_kt;
typedef struct _krb5_kt *krb5_keytab;

/**
 * Return the type of a key table.
 *
 * @param [in] context          Library context
 * @param [in] keytab           Key table handle
 *
 * @return The type of a key table as an alias that must not be modified or
 * freed by the caller.
 */
const char * KRB5_CALLCONV
krb5_kt_get_type(krb5_context context, krb5_keytab keytab);

/**
 * Get a key table name.
 *
 * @param [in]  context         Library context
 * @param [in]  keytab          Key table handle
 * @param [out] name            Key table name
 * @param [in]  namelen         Maximum length to fill in name
 *
 * Fill @a name with the name of @a keytab including the type and delimiter.
 *
 * @sa MAX_KEYTAB_NAME_LEN
 *
 * @retval
 * 0 Success
 * @retval
 * KRB5_KT_NAME_TOOLONG  Key table name does not fit in @a namelen bytes
 *
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_get_name(krb5_context context, krb5_keytab keytab, char *name,
                 unsigned int namelen);

/**
 * Close a key table handle.
 *
 * @param [in] context          Library context
 * @param [in] keytab           Key table handle
 *
 * @retval 0
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_close(krb5_context context, krb5_keytab keytab);

/**
 * Get an entry from a key table.
 *
 * @param [in]  context         Library context
 * @param [in]  keytab          Key table handle
 * @param [in]  principal       Principal name
 * @param [in]  vno             Key version number (0 for highest available)
 * @param [in]  enctype         Encryption type (0 zero for any enctype)
 * @param [out] entry           Returned entry from key table
 *
 * Retrieve an entry from a key table which matches the @a keytab, @a
 * principal, @a vno, and @a enctype.  If @a vno is zero, retrieve the
 * highest-numbered kvno matching the other fields.  If @a enctype is 0, match
 * any enctype.
 *
 * Use krb5_free_keytab_entry_contents() to free @a entry when it is no longer
 * needed.
 *
 * @note If @a vno is zero, the function retrieves the highest-numbered-kvno
 * entry that matches the specified principal.
 *
 * @retval
 * 0 Success
 * @retval
 * Kerberos error codes on failure
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_get_entry(krb5_context context, krb5_keytab keytab,
                  krb5_const_principal principal, krb5_kvno vno,
                  krb5_enctype enctype, krb5_keytab_entry *entry);

/**
 * Start a sequential retrieval of key table entries.
 *
 * @param [in]  context         Library context
 * @param [in]  keytab          Key table handle
 * @param [out] cursor          Cursor
 *
 * Prepare to read sequentially every key in the specified key table.  Use
 * krb5_kt_end_seq_get() to release the cursor when it is no longer needed.
 *
 * @sa krb5_kt_next_entry(), krb5_kt_end_seq_get()
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_start_seq_get(krb5_context context, krb5_keytab keytab,
                      krb5_kt_cursor *cursor);

/**
 * Retrieve the next entry from the key table.
 *
 * @param [in]  context         Library context
 * @param [in]  keytab          Key table handle
 * @param [out] entry           Returned key table entry
 * @param [in]  cursor          Key table cursor
 *
 * Return the next sequential entry in @a keytab and advance @a cursor.
 * Callers must release the returned entry with krb5_kt_free_entry().
 *
 * @sa krb5_kt_start_seq_get(), krb5_kt_end_seq_get()
 *
 * @retval
 * 0 Success
 * @retval
 * KRB5_KT_END - if the last entry was reached
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_next_entry(krb5_context context, krb5_keytab keytab,
                   krb5_keytab_entry *entry, krb5_kt_cursor *cursor);

/**
 * Release a keytab cursor.
 *
 * @param [in]  context         Library context
 * @param [in]  keytab          Key table handle
 * @param [out] cursor          Cursor
 *
 * This function should be called to release the cursor created by
 * krb5_kt_start_seq_get().
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_end_seq_get(krb5_context context, krb5_keytab keytab,
                    krb5_kt_cursor *cursor);

/**
 * Check if a keytab exists and contains entries.
 *
 * @param [in]  context         Library context
 * @param [in]  keytab          Key table handle
 *
 * @version New in 1.11
 *
 * @retval 0 Keytab exists and contains entries
 * @retval KRB5_KT_NOTFOUND Keytab does not contain entries
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_have_content(krb5_context context, krb5_keytab keytab);

/*
 * end "keytab.h"
 */

/*
 * begin "func-proto.h"
 */

#define KRB5_INIT_CONTEXT_SECURE 0x1 /**< Use secure context configuration */
#define KRB5_INIT_CONTEXT_KDC    0x2 /**< Use KDC configuration if available */

/**
 * Create a krb5 library context.
 *
 * @param [out] context         Library context
 *
 * The @a context must be released by calling krb5_free_context() when
 * it is no longer needed.
 *
 * @warning Any program or module that needs the Kerberos code to not trust the
 * environment must use krb5_init_secure_context(), or clean out the
 * environment.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_context(krb5_context *context);

/**
 * Create a krb5 library context using only configuration files.
 *
 * @param [out] context         Library context
 *
 * Create a context structure, using only system configuration files.  All
 * information passed through the environment variables is ignored.
 *
 * The @a context must be released by calling krb5_free_context() when
 * it is no longer needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_secure_context(krb5_context *context);

/**
 * Create a krb5 library context using a specified profile.
 *
 * @param [in]  profile         Profile object (NULL to create default profile)
 * @param [in]  flags           Context initialization flags
 * @param [out] context         Library context
 *
 * Create a context structure, optionally using a specified profile and
 * initialization flags.  If @a profile is NULL, the default profile will be
 * created from config files.  If @a profile is non-null, a copy of it will be
 * made for the new context; the caller should still clean up its copy.  Valid
 * flag values are:
 *
 * @li #KRB5_INIT_CONTEXT_SECURE Ignore environment variables
 * @li #KRB5_INIT_CONTEXT_KDC    Use KDC configuration if creating profile
 */
krb5_error_code KRB5_CALLCONV
krb5_init_context_profile(struct _profile_t *profile, krb5_flags flags,
                          krb5_context *context);

/**
 * Free a krb5 library context.
 *
 * @param [in] context          Library context
 *
 * This function frees a @a context that was created by krb5_init_context()
 * or krb5_init_secure_context().
 */
void KRB5_CALLCONV
krb5_free_context(krb5_context context);

/**
 * Copy a krb5_context structure.
 *
 * @param [in]  ctx             Library context
 * @param [out] nctx_out        New context structure
 *
 * The newly created context must be released by calling krb5_free_context()
 * when it is no longer needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_context(krb5_context ctx, krb5_context *nctx_out);

/**
 * Set default TGS encryption types in a krb5_context structure.
 *
 * @param [in] context          Library context
 * @param [in] etypes           Encryption type(s) to set
 *
 * This function sets the default enctype list for TGS requests
 * made using @a context to @a etypes.
 *
 * @note This overrides the default list (from config file or built-in).
 *
 * @retval
 *  0    Success
 * @retval
 *  KRB5_PROG_ETYPE_NOSUPP Program lacks support for encryption type
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_set_default_tgs_enctypes(krb5_context context, const krb5_enctype *etypes);

/**
 * Return a list of encryption types permitted for session keys.
 *
 * @param [in]  context         Library context
 * @param [out] ktypes          Zero-terminated list of encryption types
 *
 * This function returns the list of encryption types permitted for session
 * keys within @a context, as determined by configuration or by a previous call
 * to krb5_set_default_tgs_enctypes().
 *
 * Use krb5_free_enctypes() to free @a ktypes when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_permitted_enctypes(krb5_context context, krb5_enctype **ktypes);

/**
 * Test whether the Kerberos library was built with multithread support.
 *
 * @retval
 * TRUE if the library is threadsafe; FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_is_thread_safe(void);

/* libkrb.spec */

/**
 * Decrypt a ticket using the specified key table.
 *
 * @param [in] context          Library context
 * @param [in] kt               Key table
 * @param [in] ticket           Ticket to be decrypted
 *
 * This function takes a @a ticket as input and decrypts it using
 * key data from @a kt.  The result is placed into @a ticket->enc_part2.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_server_decrypt_ticket_keytab(krb5_context context, const krb5_keytab kt,
                                  krb5_ticket *ticket);

/**
 * Free an array of credential structures.
 *
 * @param [in] context          Library context
 * @param [in] tgts             Null-terminated array of credentials to free
 *
 * @note The last entry in the array @a tgts must be a NULL pointer.
 */
void KRB5_CALLCONV
krb5_free_tgt_creds(krb5_context context, krb5_creds **tgts);

/** @defgroup KRB5_GC  KRB5_GC
 * @{
 */
#define KRB5_GC_USER_USER    1  /**< Want user-user ticket */
#define KRB5_GC_CACHED       2  /**< Want cached ticket only */
#define KRB5_GC_CANONICALIZE 4  /**< Set canonicalize KDC option */
#define KRB5_GC_NO_STORE     8  /**< Do not store in credential cache */
#define KRB5_GC_FORWARDABLE             16  /**< Acquire forwardable tickets */
#define KRB5_GC_NO_TRANSIT_CHECK        32  /**< Disable transited check */
#define KRB5_GC_CONSTRAINED_DELEGATION  64  /**< Constrained delegation */
/** @} */ /* end of KRB5_GC group */

/**
 * Get an additional ticket.
 *
 * @param [in]  context         Library context
 * @param [in]  options         Options
 * @param [in]  ccache          Credential cache handle
 * @param [in]  in_creds        Input credentials
 * @param [out] out_creds       Output updated credentials
 *
 * Use @a ccache or a TGS exchange to get a service ticket matching @a
 * in_creds.
 *
 * Valid values for @a options are:
 * @li #KRB5_GC_CACHED     Search only credential cache for the ticket
 * @li #KRB5_GC_USER_USER  Return a user to user authentication ticket
 *
 * @a in_creds must be non-null.  @a in_creds->client and @a in_creds->server
 * must be filled in to specify the client and the server respectively.  If any
 * authorization data needs to be requested for the service ticket (such as
 * restrictions on how the ticket can be used), specify it in @a
 * in_creds->authdata; otherwise set @a in_creds->authdata to NULL.  The
 * session key type is specified in @a in_creds->keyblock.enctype, if it is
 * nonzero.
 *
 * The expiration date is specified in @a in_creds->times.endtime.
 * The KDC may return tickets with an earlier expiration date.
 * If @a in_creds->times.endtime is set to 0, the latest possible
 * expiration date will be requested.
 *
 * Any returned ticket and intermediate ticket-granting tickets are stored
 * in @a ccache.
 *
 * Use krb5_free_creds() to free @a out_creds when it is no longer needed.
 *
 * @retval
 *  0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_credentials(krb5_context context, krb5_flags options,
                     krb5_ccache ccache, krb5_creds *in_creds,
                     krb5_creds **out_creds);

/**
 * Serialize a @c krb5_creds object.
 *
 * @param [in]  context         Library context
 * @param [in]  in_creds        The credentials object to serialize
 * @param [out] data_out        The serialized credentials
 *
 * Serialize @a creds in the format used by the FILE ccache format (vesion 4)
 * and KCM ccache protocol.
 *
 * Use krb5_free_data() to free @a data_out when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_marshal_credentials(krb5_context context, krb5_creds *in_creds,
                         krb5_data **data_out);

/**
 * Deserialize a @c krb5_creds object.
 *
 * @param [in]  context         Library context
 * @param [in]  data            The serialized credentials
 * @param [out] creds_out       The resulting creds object
 *
 * Deserialize @a data to credentials in the format used by the FILE ccache
 * format (vesion 4) and KCM ccache protocol.
 *
 * Use krb5_free_creds() to free @a creds_out when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_unmarshal_credentials(krb5_context context, const krb5_data *data,
                           krb5_creds **creds_out);

/** @deprecated Replaced by krb5_get_validated_creds. */
krb5_error_code KRB5_CALLCONV
krb5_get_credentials_validate(krb5_context context, krb5_flags options,
                              krb5_ccache ccache, krb5_creds *in_creds,
                              krb5_creds **out_creds);

/** @deprecated Replaced by krb5_get_renewed_creds. */
krb5_error_code KRB5_CALLCONV
krb5_get_credentials_renew(krb5_context context, krb5_flags options,
                           krb5_ccache ccache, krb5_creds *in_creds,
                           krb5_creds **out_creds);

/**
 * Create a @c KRB_AP_REQ message.
 *
 * @param [in]     context        Library context
 * @param [in,out] auth_context   Pre-existing or newly created auth context
 * @param [in]     ap_req_options @ref AP_OPTS options
 * @param [in]     service        Service name, or NULL to use @c "host"
 * @param [in]     hostname       Host name, or NULL to use local hostname
 * @param [in]     in_data        Application data to be checksummed in the
 *                                authenticator, or NULL
 * @param [in]     ccache         Credential cache used to obtain credentials
 *                                for the desired service.
 * @param [out]    outbuf         @c AP-REQ message
 *
 * This function is similar to krb5_mk_req_extended() except that it uses a
 * given @a hostname, @a service, and @a ccache to construct a service
 * principal name and obtain credentials.
 *
 * Use krb5_free_data_contents() to free @a outbuf when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_req(krb5_context context, krb5_auth_context *auth_context,
            krb5_flags ap_req_options, const char *service,
            const char *hostname, krb5_data *in_data, krb5_ccache ccache,
            krb5_data *outbuf);

/**
 * Create a @c KRB_AP_REQ message using supplied credentials.
 *
 * @param [in]     context        Library context
 * @param [in,out] auth_context   Pre-existing or newly created auth context
 * @param [in]     ap_req_options @ref AP_OPTS options
 * @param [in]     in_data        Application data to be checksummed in the
 *                                authenticator, or NULL
 * @param [in]     in_creds       Credentials for the service with valid ticket
 *                                and key
 * @param [out]    outbuf         @c AP-REQ message
 *
 * Valid @a ap_req_options are:
 * @li #AP_OPTS_USE_SESSION_KEY - Use the session key when creating the
 *                                request used for user to user
 *                                authentication.
 * @li #AP_OPTS_MUTUAL_REQUIRED - Request a mutual authentication packet from
 *                                the receiver.
 * @li #AP_OPTS_USE_SUBKEY      - Generate a subsession key from the current
 *                                session key obtained from the credentials.
 *
 * This function creates a KRB_AP_REQ message using supplied credentials @a
 * in_creds.  @a auth_context may point to an existing auth context or to NULL,
 * in which case a new one will be created.  If @a in_data is non-null, a
 * checksum of it will be included in the authenticator contained in the
 * KRB_AP_REQ message.  Use krb5_free_data_contents() to free @a outbuf when it
 * is no longer needed.
 *
 * On successful return, the authenticator is stored in @a auth_context with
 * the @a client and @a checksum fields nulled out.  (This is to prevent
 * pointer-sharing problems; the caller should not need these fields anyway,
 * since the caller supplied them.)
 *
 * @sa krb5_mk_req()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_req_extended(krb5_context context, krb5_auth_context *auth_context,
                     krb5_flags ap_req_options, krb5_data *in_data,
                     krb5_creds *in_creds, krb5_data *outbuf);

/**
 * Format and encrypt a @c KRB_AP_REP message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] outbuf          @c AP-REP message
 *
 * This function fills in @a outbuf with an AP-REP message using information
 * from @a auth_context.
 *
 * If the flags in @a auth_context indicate that a sequence number should be
 * used (either #KRB5_AUTH_CONTEXT_DO_SEQUENCE or
 * #KRB5_AUTH_CONTEXT_RET_SEQUENCE) and the local sequence number in @a
 * auth_context is 0, a new number will be generated with
 * krb5_generate_seq_number().
 *
 * Use krb5_free_data_contents() to free @a outbuf when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_rep(krb5_context context, krb5_auth_context auth_context, krb5_data *outbuf);

/**
 * Format and encrypt a @c KRB_AP_REP message for DCE RPC.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] outbuf          @c AP-REP message
 *
 * Use krb5_free_data_contents() to free @a outbuf when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_rep_dce(krb5_context context, krb5_auth_context auth_context, krb5_data *outbuf);

/**
 * Parse and decrypt a @c KRB_AP_REP message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  inbuf           AP-REP message
 * @param [out] repl            Decrypted reply message
 *
 * This function parses, decrypts and verifies a message from @a inbuf and
 * fills in @a repl with a pointer to allocated memory containing the fields
 * from the encrypted response.
 *
 * Use krb5_free_ap_rep_enc_part() to free @a repl when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_rep(krb5_context context, krb5_auth_context auth_context,
            const krb5_data *inbuf, krb5_ap_rep_enc_part **repl);

/**
 * Parse and decrypt a @c KRB_AP_REP message for DCE RPC.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  inbuf           AP-REP message
 * @param [out] nonce           Sequence number from the decrypted reply
 *
 * This function parses, decrypts and verifies a message from @a inbuf and
 * fills in @a nonce with a decrypted reply sequence number.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_rep_dce(krb5_context context, krb5_auth_context auth_context,
                const krb5_data *inbuf, krb5_ui_4 *nonce);

/**
 * Format and encode a @c KRB_ERROR message.
 *
 * @param [in]  context         Library context
 * @param [in]  dec_err         Error structure to be encoded
 * @param [out] enc_err         Encoded error structure
 *
 * This function creates a @c KRB_ERROR message in @a enc_err.  Use
 * krb5_free_data_contents() to free @a enc_err when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_error(krb5_context context, const krb5_error *dec_err,
              krb5_data *enc_err);

/**
 * Decode a @c KRB-ERROR message.
 *
 * @param [in]  context         Library context
 * @param [in]  enc_errbuf      Encoded error message
 * @param [out] dec_error       Decoded error message
 *
 * This function processes @c KRB-ERROR message @a enc_errbuf and returns
 * an allocated structure @a dec_error containing the error message.
 * Use krb5_free_error() to free @a dec_error when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_error(krb5_context context, const krb5_data *enc_errbuf,
              krb5_error **dec_error);

/**
 * Process @c KRB-SAFE message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  inbuf           @c KRB-SAFE message to be parsed
 * @param [out] userdata_out    Data parsed from @c KRB-SAFE message
 * @param [out] rdata_out       Replay data. Specify NULL if not needed
 *
 * This function parses a @c KRB-SAFE message, verifies its integrity, and
 * stores its data into @a userdata_out.
 *
 * @note The @a rdata_out argument is required if the
 * #KRB5_AUTH_CONTEXT_RET_TIME or #KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set
 * in @a auth_context.
 *
 * If @a auth_context has a remote address set, the address will be used to
 * verify the sender address in the KRB-SAFE message.  If @a auth_context has a
 * local address set, it will be used to verify the receiver address in the
 * KRB-SAFE message if the message contains one.
 *
 * If the #KRB5_AUTH_CONTEXT_DO_SEQUENCE flag is set in @a auth_context, the
 * sequence number of the KRB-SAFE message is checked against the remote
 * sequence number field of @a auth_context.  Otherwise, the sequence number is
 * not used.
 *
 * If the #KRB5_AUTH_CONTEXT_DO_TIME flag is set in @a auth_context, then the
 * timestamp in the message is verified to be within the permitted clock skew
 * of the current time, and the message is checked against an in-memory replay
 * cache to detect reflections or replays.
 *
 * Use krb5_free_data_contents() to free @a userdata_out when it is no longer
 * needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_safe(krb5_context context, krb5_auth_context auth_context,
             const krb5_data *inbuf, krb5_data *userdata_out,
             krb5_replay_data *rdata_out);

/**
 * Process a @c KRB-PRIV message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication structure
 * @param [in]  inbuf           @c KRB-PRIV message to be parsed
 * @param [out] userdata_out    Data parsed from @c KRB-PRIV message
 * @param [out] rdata_out       Replay data. Specify NULL if not needed
 *
 * This function parses a @c KRB-PRIV message, verifies its integrity, and
 * stores its unencrypted data into @a userdata_out.
 *
 * @note The @a rdata_out argument is required if the
 * #KRB5_AUTH_CONTEXT_RET_TIME or #KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set
 * in @a auth_context.
 *
 * If @a auth_context has a remote address set, the address will be used to
 * verify the sender address in the KRB-PRIV message.  If @a auth_context has a
 * local address set, it will be used to verify the receiver address in the
 * KRB-PRIV message if the message contains one.
 *
 * If the #KRB5_AUTH_CONTEXT_DO_SEQUENCE flag is set in @a auth_context, the
 * sequence number of the KRB-PRIV message is checked against the remote
 * sequence number field of @a auth_context.  Otherwise, the sequence number is
 * not used.
 *
 * If the #KRB5_AUTH_CONTEXT_DO_TIME flag is set in @a auth_context, then the
 * timestamp in the message is verified to be within the permitted clock skew
 * of the current time, and the message is checked against an in-memory replay
 * cache to detect reflections or replays.
 *
 * Use krb5_free_data_contents() to free @a userdata_out when it is no longer
 * needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_priv(krb5_context context, krb5_auth_context auth_context,
             const krb5_data *inbuf, krb5_data *userdata_out,
             krb5_replay_data *rdata_out);

/**
 * Convert a string principal name to a krb5_principal structure.
 *
 * @param [in]  context         Library context
 * @param [in]  name            String representation of a principal name
 * @param [out] principal_out   New principal
 *
 * Convert a string representation of a principal name to a krb5_principal
 * structure.
 *
 * A string representation of a Kerberos name consists of one or more principal
 * name components, separated by slashes, optionally followed by the \@
 * character and a realm name.  If the realm name is not specified, the local
 * realm is used.
 *
 * To use the slash and \@ symbols as part of a component (quoted) instead of
 * using them as a component separator or as a realm prefix), put a backslash
 * (\) character in front of the symbol.  Similarly, newline, tab, backspace,
 * and NULL characters can be included in a component by using @c n, @c t, @c b
 * or @c 0, respectively.
 *
 * @note The realm in a Kerberos @a name cannot contain slash, colon,
 * or NULL characters.
 *
 * Beginning with release 1.20, the name type of the principal will be inferred
 * as @c KRB5_NT_SRV_INST or @c KRB5_NT_WELLKNOWN based on the principal name.
 * The type will be @c KRB5_NT_PRINCIPAL if a type cannot be inferred.
 *
 * Use krb5_free_principal() to free @a principal_out when it is no longer
 * needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_parse_name(krb5_context context, const char *name,
                krb5_principal *principal_out);

#define KRB5_PRINCIPAL_PARSE_NO_REALM      0x1 /**< Error if realm is present */
#define KRB5_PRINCIPAL_PARSE_REQUIRE_REALM 0x2 /**< Error if realm is not present */
#define KRB5_PRINCIPAL_PARSE_ENTERPRISE    0x4 /**< Create single-component
                                                  enterprise principle */
#define KRB5_PRINCIPAL_PARSE_IGNORE_REALM  0x8 /**< Ignore realm if present */
#define KRB5_PRINCIPAL_PARSE_NO_DEF_REALM  0x10 /**< Don't add default realm */

/**
 * Convert a string principal name to a krb5_principal with flags.
 *
 * @param [in]  context         Library context
 * @param [in]  name            String representation of a principal name
 * @param [in]  flags           Flag
 * @param [out] principal_out   New principal
 *
 * Similar to krb5_parse_name(), this function converts a single-string
 * representation of a principal name to a krb5_principal structure.
 *
 * The following flags are valid:
 * @li #KRB5_PRINCIPAL_PARSE_NO_REALM - no realm must be present in @a name
 * @li #KRB5_PRINCIPAL_PARSE_REQUIRE_REALM - realm must be present in @a name
 * @li #KRB5_PRINCIPAL_PARSE_ENTERPRISE - create single-component enterprise
 *                                        principal
 * @li #KRB5_PRINCIPAL_PARSE_IGNORE_REALM - ignore realm if present in @a name
 *
 * If @c KRB5_PRINCIPAL_PARSE_NO_REALM or @c KRB5_PRINCIPAL_PARSE_IGNORE_REALM
 * is specified in @a flags, the realm of the new principal will be empty.
 * Otherwise, the default realm for @a context will be used if @a name does not
 * specify a realm.
 *
 * Use krb5_free_principal() to free @a principal_out when it is no longer
 * needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_parse_name_flags(krb5_context context, const char *name,
                      int flags, krb5_principal *principal_out);

/**
 * Convert a krb5_principal structure to a string representation.
 *
 * @param [in]  context         Library context
 * @param [in]  principal       Principal
 * @param [out] name            String representation of principal name
 *
 * The resulting string representation uses the format and quoting conventions
 * described for krb5_parse_name().
 *
 * Use krb5_free_unparsed_name() to free @a name when it is no longer needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_unparse_name(krb5_context context, krb5_const_principal principal,
                  char **name);

/**
 * Convert krb5_principal structure to string and length.
 *
 * @param [in]     context      Library context
 * @param [in]     principal    Principal
 * @param [in,out] name         String representation of principal name
 * @param [in,out] size         Size of unparsed name
 *
 * This function is similar to krb5_unparse_name(), but allows the use of an
 * existing buffer for the result.  If size is not NULL, then @a name must
 * point to either NULL or an existing buffer of at least the size pointed to
 * by @a size.  The buffer will be allocated or resized if necessary, with the
 * new pointer stored into @a name.  Whether or not the buffer is resized, the
 * necessary space for the result, including null terminator, will be stored
 * into @a size.
 *
 * If size is NULL, this function behaves exactly as krb5_unparse_name().
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes. On failure @a name is set to NULL
 */
krb5_error_code KRB5_CALLCONV
krb5_unparse_name_ext(krb5_context context, krb5_const_principal principal,
                      char **name, unsigned int *size);

#define KRB5_PRINCIPAL_UNPARSE_SHORT  0x1 /**< Omit realm if it is the local realm */
#define KRB5_PRINCIPAL_UNPARSE_NO_REALM 0x2 /**< Omit realm always */
#define KRB5_PRINCIPAL_UNPARSE_DISPLAY  0x4 /**< Don't escape special characters */

/**
 * Convert krb5_principal structure to a string with flags.
 *
 * @param [in]  context         Library context
 * @param [in]  principal       Principal
 * @param [in]  flags           Flags
 * @param [out] name            String representation of principal name
 *
 * Similar to krb5_unparse_name(), this function converts a krb5_principal
 * structure to a string representation.
 *
 * The following flags are valid:
 * @li #KRB5_PRINCIPAL_UNPARSE_SHORT - omit realm if it is the local realm
 * @li #KRB5_PRINCIPAL_UNPARSE_NO_REALM - omit realm
 * @li #KRB5_PRINCIPAL_UNPARSE_DISPLAY - do not quote special characters
 *
 * Use krb5_free_unparsed_name() to free @a name when it is no longer needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes. On failure @a name is set to NULL
 */
krb5_error_code KRB5_CALLCONV
krb5_unparse_name_flags(krb5_context context, krb5_const_principal principal,
                        int flags, char **name);

/**
 * Convert krb5_principal structure to string format with flags.
 *
 * @param [in]  context         Library context
 * @param [in]  principal       Principal
 * @param [in]  flags           Flags
 * @param [out] name            Single string format of principal name
 * @param [out] size            Size of unparsed name buffer
 *
 * @sa krb5_unparse_name() krb5_unparse_name_flags() krb5_unparse_name_ext()
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes. On failure @a name is set to NULL
 */
krb5_error_code KRB5_CALLCONV
krb5_unparse_name_flags_ext(krb5_context context, krb5_const_principal principal,
                            int flags, char **name, unsigned int *size);

/**
 * Set the realm field of a principal
 *
 * @param [in] context          Library context
 * @param [in] principal        Principal name
 * @param [in] realm            Realm name
 *
 * Set the realm name part of @a principal to @a realm, overwriting the
 * previous realm.
 *
 * @retval
 * 0   Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_set_principal_realm(krb5_context context, krb5_principal principal,
                         const char *realm);

/**
 * Search a list of addresses for a specified address.
 *
 * @param [in] context          Library context
 * @param [in] addr             Address to search for
 * @param [in] addrlist         Address list to be searched (or NULL)
 *
 * @note If @a addrlist contains only a NetBIOS addresses, it will be treated
 *       as a null list.
 *
 * @return
 * TRUE if @a addr is listed in @a addrlist, or @c addrlist is NULL; FALSE
 * otherwise
 */
krb5_boolean KRB5_CALLCONV_WRONG
krb5_address_search(krb5_context context, const krb5_address *addr,
                    krb5_address *const *addrlist);

/**
 * Compare two Kerberos addresses.
 *
 * @param [in] context          Library context
 * @param [in] addr1            First address to be compared
 * @param [in] addr2            Second address to be compared
 *
 * @return
 * TRUE if the addresses are the same, FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_address_compare(krb5_context context, const krb5_address *addr1,
                     const krb5_address *addr2);

/**
 * Return an ordering of the specified addresses.
 *
 * @param [in] context          Library context
 * @param [in] addr1            First address
 * @param [in] addr2            Second address
 *
 * @retval 0 if The two addresses are the same
 * @retval < 0 First address is less than second
 * @retval > 0 First address is greater than second
 */
int KRB5_CALLCONV
krb5_address_order(krb5_context context, const krb5_address *addr1,
                   const krb5_address *addr2);

/**
 * Compare the realms of two principals.
 *
 * @param [in] context          Library context
 * @param [in] princ1           First principal
 * @param [in] princ2           Second principal
 *
 * @retval
 * TRUE if the realm names are the same; FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_realm_compare(krb5_context context, krb5_const_principal princ1,
                   krb5_const_principal princ2);

/**
 * Compare two principals.
 *
 * @param [in] context          Library context
 * @param [in] princ1           First principal
 * @param [in] princ2           Second principal
 *
 * @retval
 * TRUE if the principals are the same; FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_principal_compare(krb5_context context,
                       krb5_const_principal princ1,
                       krb5_const_principal princ2);

/**
 * Compare two principals ignoring realm components.
 *
 * @param [in] context          Library context
 * @param [in] princ1           First principal
 * @param [in] princ2           Second principal
 *
 * Similar to krb5_principal_compare(), but do not compare the realm
 * components of the principals.
 *
 * @retval
 * TRUE if the principals are the same; FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_principal_compare_any_realm(krb5_context context,
                                 krb5_const_principal princ1,
                                 krb5_const_principal princ2);

#define KRB5_PRINCIPAL_COMPARE_IGNORE_REALM  1 /**< ignore realm component */
#define KRB5_PRINCIPAL_COMPARE_ENTERPRISE    2 /**< UPNs as real principals */
#define KRB5_PRINCIPAL_COMPARE_CASEFOLD      4 /**< case-insensitive */
#define KRB5_PRINCIPAL_COMPARE_UTF8          8 /**< treat principals as UTF-8 */

/**
 * Compare two principals with additional flags.
 *
 * @param [in] context           Library context
 * @param [in] princ1            First principal
 * @param [in] princ2            Second principal
 * @param [in] flags             Flags
 *
 * Valid flags are:
 * @li #KRB5_PRINCIPAL_COMPARE_IGNORE_REALM - ignore realm component
 * @li #KRB5_PRINCIPAL_COMPARE_ENTERPRISE - UPNs as real principals
 * @li #KRB5_PRINCIPAL_COMPARE_CASEFOLD case-insensitive
 * @li #KRB5_PRINCIPAL_COMPARE_UTF8 - treat principals as UTF-8
 *
 * @sa krb5_principal_compare()
 *
 * @retval
 * TRUE if the principal names are the same; FALSE otherwise
 */
krb5_boolean KRB5_CALLCONV
krb5_principal_compare_flags(krb5_context context,
                             krb5_const_principal princ1,
                             krb5_const_principal princ2,
                             int flags);

/**
 * Initialize an empty @c krb5_keyblock.
 *
 * @param [in]  context         Library context
 * @param [in]  enctype         Encryption type
 * @param [in]  length          Length of keyblock (or 0)
 * @param [out] out             New keyblock structure
 *
 * Initialize a new keyblock and allocate storage for the contents of the key.
 * It is legal to pass in a length of 0, in which case contents are left
 * unallocated.  Use krb5_free_keyblock() to free @a out when it is no longer
 * needed.
 *
 * @note If @a length is set to 0, contents are left unallocated.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_keyblock(krb5_context context, krb5_enctype enctype,
                   size_t length, krb5_keyblock **out);

/**
 * Copy a keyblock.
 *
 * @param [in]  context         Library context
 * @param [in]  from            Keyblock to be copied
 * @param [out] to              Copy of keyblock @a from
 *
 * This function creates a new keyblock with the same contents as @a from.  Use
 * krb5_free_keyblock() to free @a to when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_keyblock(krb5_context context, const krb5_keyblock *from,
                   krb5_keyblock **to);

/**
 * Copy the contents of a keyblock.
 *
 * @param [in]  context         Library context
 * @param [in]  from            Key to be copied
 * @param [out] to              Output key
 *
 * This function copies the contents of @a from to @a to.  Use
 * krb5_free_keyblock_contents() to free @a to when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_keyblock_contents(krb5_context context, const krb5_keyblock *from,
                            krb5_keyblock *to);

/**
 * Copy a krb5_creds structure.
 *
 * @param [in]  context         Library context
 * @param [in]  incred          Credentials structure to be copied
 * @param [out] outcred         Copy of @a incred
 *
 * This function creates a new credential with the contents of @a incred.  Use
 * krb5_free_creds() to free @a outcred when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_creds(krb5_context context, const krb5_creds *incred, krb5_creds **outcred);

/**
 * Copy a krb5_data object.
 *
 * @param [in]  context           Library context
 * @param [in]  indata            Data object to be copied
 * @param [out] outdata           Copy of @a indata
 *
 * This function creates a new krb5_data object with the contents of @a indata.
 * Use krb5_free_data() to free @a outdata when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_data(krb5_context context, const krb5_data *indata, krb5_data **outdata);

/**
 * Copy a principal.
 *
 * @param [in]  context         Library context
 * @param [in]  inprinc         Principal to be copied
 * @param [out] outprinc        Copy of @a inprinc
 *
 * This function creates a new principal structure with the contents of @a
 * inprinc.  Use krb5_free_principal() to free @a outprinc when it is no longer
 * needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_principal(krb5_context context, krb5_const_principal inprinc,
                    krb5_principal *outprinc);

/**
 * Copy an array of addresses.
 *
 * @param [in]  context         Library context
 * @param [in]  inaddr          Array of addresses to be copied
 * @param [out] outaddr         Copy of array of addresses
 *
 * This function creates a new address array containing a copy of @a inaddr.
 * Use krb5_free_addresses() to free @a outaddr when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_addresses(krb5_context context, krb5_address *const *inaddr,
                    krb5_address ***outaddr);

/**
 * Copy a krb5_ticket structure.
 *
 * @param [in]  context         Library context
 * @param [in]  from            Ticket to be copied
 * @param [out] pto             Copy of ticket
 *
 * This function creates a new krb5_ticket structure containing the contents of
 * @a from.  Use krb5_free_ticket() to free @a pto when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_ticket(krb5_context context, const krb5_ticket *from, krb5_ticket **pto);

/**
 * Copy an authorization data list.
 *
 * @param [in]  context         Library context
 * @param [in]  in_authdat      List of @a krb5_authdata structures
 * @param [out] out             New array of @a krb5_authdata structures
 *
 * This function creates a new authorization data list containing a copy of @a
 * in_authdat, which must be null-terminated.  Use krb5_free_authdata() to free
 * @a out when it is no longer needed.
 *
 * @note The last array entry in @a in_authdat must be a NULL pointer.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_authdata(krb5_context context,
                   krb5_authdata *const *in_authdat, krb5_authdata ***out);

/**
 * Find authorization data elements.
 *
 * @param [in]  context         Library context
 * @param [in]  ticket_authdata Authorization data list from ticket
 * @param [in]  ap_req_authdata Authorization data list from AP request
 * @param [in]  ad_type         Authorization data type to find
 * @param [out] results         List of matching entries
 *
 * This function searches @a ticket_authdata and @a ap_req_authdata for
 * elements of type @a ad_type.  Either input list may be NULL, in which case
 * it will not be searched; otherwise, the input lists must be terminated by
 * NULL entries.  This function will search inside AD-IF-RELEVANT containers if
 * found in either list.  Use krb5_free_authdata() to free @a results when it
 * is no longer needed.
 *
 * @version New in 1.10
 */
krb5_error_code KRB5_CALLCONV
krb5_find_authdata(krb5_context context, krb5_authdata *const *ticket_authdata,
                   krb5_authdata *const *ap_req_authdata,
                   krb5_authdatatype ad_type, krb5_authdata ***results);

/**
 * Merge two authorization data lists into a new list.
 *
 * @param [in]  context         Library context
 * @param [in]  inauthdat1      First list of @a krb5_authdata structures
 * @param [in]  inauthdat2      Second list of @a krb5_authdata structures
 * @param [out] outauthdat      Merged list of @a krb5_authdata structures
 *
 * Merge two authdata arrays, such as the array from a ticket
 * and authenticator.
 * Use krb5_free_authdata() to free @a outauthdat when it is no longer needed.
 *
 * @note The last array entry in @a inauthdat1 and @a inauthdat2
 * must be a NULL pointer.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_merge_authdata(krb5_context context,
                    krb5_authdata *const *inauthdat1,
                    krb5_authdata * const *inauthdat2,
                    krb5_authdata ***outauthdat);

/**
 * Copy a krb5_authenticator structure.
 *
 * @param [in]  context         Library context
 * @param [in]  authfrom        krb5_authenticator structure to be copied
 * @param [out] authto          Copy of krb5_authenticator structure
 *
 * This function creates a new krb5_authenticator structure with the content of
 * @a authfrom.  Use krb5_free_authenticator() to free @a authto when it is no
 * longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_authenticator(krb5_context context, const krb5_authenticator *authfrom,
                        krb5_authenticator **authto);

/**
 * Copy a krb5_checksum structure.
 *
 * @param [in]  context         Library context
 * @param [in]  ckfrom          Checksum to be copied
 * @param [out] ckto            Copy of krb5_checksum structure
 *
 * This function creates a new krb5_checksum structure with the contents of @a
 * ckfrom.  Use krb5_free_checksum() to free @a ckto when it is no longer
 * needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_copy_checksum(krb5_context context, const krb5_checksum *ckfrom,
                   krb5_checksum **ckto);

/**
 * Generate a replay cache object for server use and open it.
 *
 * @param [in]  context         Library context
 * @param [in]  piece           Unused (replay cache identifier)
 * @param [out] rcptr           Handle to an open rcache
 *
 * This function creates a handle to the default replay cache.  Use
 * krb5_rc_close() to close @a rcptr when it is no longer needed.
 *
 * @version Prior to release 1.18, this function creates a handle to a
 * different replay cache for each unique value of @a piece.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_server_rcache(krb5_context context, const krb5_data *piece,
                       krb5_rcache *rcptr);

/**
 * Build a principal name using length-counted strings.
 *
 * @param [in]  context  Library context
 * @param [out] princ    Principal name
 * @param [in]  rlen     Realm name length
 * @param [in]  realm    Realm name
 * @param [in]  ...      List of unsigned int/char * components, followed by 0
 *
 * This function creates a principal from a length-counted string and a
 * variable-length list of length-counted components.  The list of components
 * ends with the first 0 length argument (so it is not possible to specify an
 * empty component with this function).  Call krb5_free_principal() to free
 * allocated memory for principal when it is no longer needed.
 *
 * Beginning with release 1.20, the name type of the principal will be inferred
 * as @c KRB5_NT_SRV_INST or @c KRB5_NT_WELLKNOWN based on the principal name.
 * The type will be @c KRB5_NT_PRINCIPAL if a type cannot be inferred.
 *
 * @code
 * Example of how to build principal WELLKNOWN/ANONYMOUS@R
 *     krb5_build_principal_ext(context, &principal, strlen("R"), "R",
 *         (unsigned int)strlen(KRB5_WELLKNOWN_NAMESTR),
 *         KRB5_WELLKNOWN_NAMESTR,
 *         (unsigned int)strlen(KRB5_ANONYMOUS_PRINCSTR),
 *         KRB5_ANONYMOUS_PRINCSTR, 0);
 * @endcode
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV_C
krb5_build_principal_ext(krb5_context context,  krb5_principal * princ,
                         unsigned int rlen, const char * realm, ...);

/**
 * Build a principal name using null-terminated strings.
 *
 * @param [in]  context         Library context
 * @param [out] princ           Principal name
 * @param [in]  rlen            Realm name length
 * @param [in]  realm           Realm name
 * @param [in]  ...             List of char * components, ending with NULL
 *
 * Call krb5_free_principal() to free @a princ when it is no longer needed.
 *
 * Beginning with release 1.20, the name type of the principal will be inferred
 * as @c KRB5_NT_SRV_INST or @c KRB5_NT_WELLKNOWN based on the principal name.
 * The type will be @c KRB5_NT_PRINCIPAL if a type cannot be inferred.
 *
 * @note krb5_build_principal() and krb5_build_principal_alloc_va() perform the
 * same task.  krb5_build_principal() takes variadic arguments.
 * krb5_build_principal_alloc_va() takes a pre-computed @a varargs pointer.
 *
 * @code
 * Example of how to build principal H/S@R
 *     krb5_build_principal(context, &principal,
 *                          strlen("R"), "R", "H", "S", (char*)NULL);
 * @endcode
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV_C
krb5_build_principal(krb5_context context,
                     krb5_principal * princ,
                     unsigned int rlen,
                     const char * realm, ...)
#if __GNUC__ >= 4
    __attribute__ ((sentinel))
#endif
    ;
#if KRB5_DEPRECATED
/** @deprecated Replaced by krb5_build_principal_alloc_va(). */
KRB5_ATTR_DEPRECATED krb5_error_code KRB5_CALLCONV
krb5_build_principal_va(krb5_context context,
                        krb5_principal princ,
                        unsigned int rlen,
                        const char *realm,
                        va_list ap);
#endif

/**
 * Build a principal name, using a precomputed variable argument list
 *
 * @param [in]  context         Library context
 * @param [out] princ           Principal structure
 * @param [in]  rlen            Realm name length
 * @param [in]  realm           Realm name
 * @param [in]  ap              List of char * components, ending with NULL
 *
 * Similar to krb5_build_principal(), this function builds a principal name,
 * but its name components are specified as a va_list.
 *
 * Use krb5_free_principal() to deallocate @a princ when it is no longer
 * needed.
 *
 * @code
 * Function usage example:
 *   va_list ap;
 *   va_start(ap, realm);
 *   krb5_build_principal_alloc_va(context, princ, rlen, realm, ap);
 *   va_end(ap);
 * @endcode
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_build_principal_alloc_va(krb5_context context,
                              krb5_principal *princ,
                              unsigned int rlen,
                              const char *realm,
                              va_list ap);

/**
 * Convert a Kerberos V4 principal to a Kerberos V5 principal.
 *
 * @param [in]  context         Library context
 * @param [in]  name            V4 name
 * @param [in]  instance        V4 instance
 * @param [in]  realm           Realm
 * @param [out] princ           V5 principal
 *
 * This function builds a @a princ from V4 specification based on given input
 * @a name.instance\@realm.
 *
 * Use krb5_free_principal() to free @a princ when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_425_conv_principal(krb5_context context, const char *name,
                        const char *instance, const char *realm,
                        krb5_principal *princ);

/**
 * Convert a Kerberos V5 principal to a Kerberos V4 principal.
 *
 * @param [in]  context         Library context
 * @param [in]  princ           V5 Principal
 * @param [out] name            V4 principal's name to be filled in
 * @param [out] inst            V4 principal's instance name to be filled in
 * @param [out] realm           Principal's realm name to be filled in
 *
 * This function separates a V5 principal @a princ into @a name, @a instance,
 * and @a realm.
 *
 * @retval
 *  0  Success
 * @retval
 *  KRB5_INVALID_PRINCIPAL   Invalid principal name
 * @retval
 *  KRB5_CONFIG_CANTOPEN     Can't open or find Kerberos configuration file
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_524_conv_principal(krb5_context context, krb5_const_principal princ,
                        char *name, char *inst, char *realm);
/**
 *@deprecated
 */
struct credentials;

/**
 * Convert a Kerberos V5 credentials to a Kerberos V4 credentials
 *
 * @note Not implemented
 *
 * @retval KRB524_KRB4_DISABLED (always)
 */
int KRB5_CALLCONV
krb5_524_convert_creds(krb5_context context, krb5_creds *v5creds,
                       struct credentials *v4creds);

#if KRB5_DEPRECATED
#define krb524_convert_creds_kdc krb5_524_convert_creds
#define krb524_init_ets(x) (0)
#endif

/* libkt.spec */

/**
 * Get a handle for a key table.
 *
 * @param [in]  context         Library context
 * @param [in]  name            Name of the key table
 * @param [out] ktid            Key table handle
 *
 * Resolve the key table name @a name and set @a ktid to a handle identifying
 * the key table.  Use krb5_kt_close() to free @a ktid when it is no longer
 * needed.
 *
 * @a name must be of the form @c type:residual, where @a type must be a type
 * known to the library and @a residual portion should be specific to the
 * particular keytab type.  If no @a type is given, the default is @c FILE.
 *
 * If @a name is of type @c FILE, the keytab file is not opened by this call.
 *
 * @code
 *  Example: krb5_kt_resolve(context, "FILE:/tmp/filename", &ktid);
 * @endcode
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_resolve(krb5_context context, const char *name, krb5_keytab *ktid);

/**
 * Duplicate keytab handle.
 *
 * @param [in]  context         Library context
 * @param [in]  in              Key table handle to be duplicated
 * @param [out] out             Key table handle
 *
 * Create a new handle referring to the same key table as @a in.  The new
 * handle and @a in can be closed independently.
 *
 * @version New in 1.12
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_dup(krb5_context context, krb5_keytab in, krb5_keytab *out);

/**
 * Get the default key table name.
 *
 * @param [in]     context      Library context
 * @param [out]    name         Default key table name
 * @param [in]     name_size    Space available in @a name
 *
 * Fill @a name with the name of the default key table for @a context.
 *
 * @sa MAX_KEYTAB_NAME_LEN
 *
 * @retval
 * 0 Success
 * @retval
 * KRB5_CONFIG_NOTENUFSPACE Buffer is too short
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_default_name(krb5_context context, char *name, int name_size);

/**
 * Resolve the default key table.
 *
 * @param [in]  context         Library context
 * @param [out] id              Key table handle
 *
 * Set @a id to a handle to the default key table.  The key table is not
 * opened.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_default(krb5_context context, krb5_keytab *id);

/**
 * Resolve the default client key table.
 *
 * @param [in]     context      Library context
 * @param [out]    keytab_out   Key table handle
 *
 * Fill @a keytab_out with a handle to the default client key table.
 *
 * @version New in 1.11
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_client_default(krb5_context context, krb5_keytab *keytab_out);

/**
 * Free the contents of a key table entry.
 *
 * @param [in] context          Library context
 * @param [in] entry            Key table entry whose contents are to be freed
 *
 * @note The pointer is not freed.
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_free_keytab_entry_contents(krb5_context context, krb5_keytab_entry *entry);

/** @deprecated Use krb5_free_keytab_entry_contents instead. */
krb5_error_code KRB5_CALLCONV
krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *entry);

/* remove and add are functions, so that they can return NOWRITE
   if not a writable keytab */

/**
 * Remove an entry from a key table.
 *
 * @param [in] context          Library context
 * @param [in] id               Key table handle
 * @param [in] entry            Entry to remove from key table
 *
 * @retval
 * 0 Success
 * @retval
 *  KRB5_KT_NOWRITE     Key table is not writable
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_remove_entry(krb5_context context, krb5_keytab id, krb5_keytab_entry *entry);

/**
 * Add a new entry to a key table.
 *
 * @param [in] context          Library context
 * @param [in] id               Key table handle
 * @param [in] entry            Entry to be added
 *
 * @retval
 * 0  Success
 * @retval
 *  ENOMEM    Insufficient memory
 * @retval
 *  KRB5_KT_NOWRITE  Key table is not writeable
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_add_entry(krb5_context context, krb5_keytab id, krb5_keytab_entry *entry);

/**
 * Convert a principal name into the default salt for that principal.
 *
 * @param [in]  context         Library context
 * @param [in]  pr              Principal name
 * @param [out] ret             Default salt for @a pr to be filled in
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV_WRONG
krb5_principal2salt(krb5_context context,
                    krb5_const_principal pr, krb5_data *ret);
/* librc.spec--see rcache.h */

/* libcc.spec */

/**
 * Resolve a credential cache name.
 *
 * @param [in]  context         Library context
 * @param [in]  name            Credential cache name to be resolved
 * @param [out] cache           Credential cache handle
 *
 * Fills in @a cache with a @a cache handle that corresponds to the name in @a
 * name.  @a name should be of the form @c type:residual, and @a type must be a
 * type known to the library.  If the @a name does not contain a colon,
 * interpret it as a file name.
 *
 * @code
 * Example: krb5_cc_resolve(context, "MEMORY:C_", &cache);
 * @endcode
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_resolve(krb5_context context, const char *name, krb5_ccache *cache);

/**
 * Duplicate ccache handle.
 *
 * @param [in]  context         Library context
 * @param [in]  in              Credential cache handle to be duplicated
 * @param [out] out             Credential cache handle
 *
 * Create a new handle referring to the same cache as @a in.
 * The new handle and @a in can be closed independently.
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_dup(krb5_context context, krb5_ccache in, krb5_ccache *out);

/**
 * Return the name of the default credential cache.
 *
 * @param [in] context          Library context
 *
 * Return a pointer to the default credential cache name for @a context, as
 * determined by a prior call to krb5_cc_set_default_name(), by the KRB5CCNAME
 * environment variable, by the default_ccache_name profile variable, or by the
 * operating system or build-time default value.  The returned value must not
 * be modified or freed by the caller.  The returned value becomes invalid when
 * @a context is destroyed krb5_free_context() or if a subsequent call to
 * krb5_cc_set_default_name() is made on @a context.
 *
 * The default credential cache name is cached in @a context between calls to
 * this function, so if the value of KRB5CCNAME changes in the process
 * environment after the first call to this function on, that change will not
 * be reflected in later calls with the same context.  The caller can invoke
 * krb5_cc_set_default_name() with a NULL value of @a name to clear the cached
 * value and force the default name to be recomputed.
 *
 * @return
 * Name of default credential cache for the current user.
 */
const char *KRB5_CALLCONV
krb5_cc_default_name(krb5_context context);

/**
 * Set the default credential cache name.
 *
 * @param [in] context          Library context
 * @param [in] name             Default credential cache name or NULL
 *
 * Set the default credential cache name to @a name for future operations using
 * @a context.  If @a name is NULL, clear any previous application-set default
 * name and forget any cached value of the default name for @a context.
 *
 * Calls to this function invalidate the result of any previous calls to
 * krb5_cc_default_name() using @a context.
 *
 * @retval
 *  0  Success
 * @retval
 *  KV5M_CONTEXT          Bad magic number for @c _krb5_context structure
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_set_default_name(krb5_context context, const char *name);

/**
 * Resolve the default credential cache name.
 *
 * @param [in]  context         Library context
 * @param [out] ccache          Pointer to credential cache name
 *
 * Create a handle to the default credential cache as given by
 * krb5_cc_default_name().
 *
 * @retval
 * 0  Success
 * @retval
 * KV5M_CONTEXT            Bad magic number for @c _krb5_context structure
 * @retval
 * KRB5_FCC_INTERNAL       The name of the default credential cache cannot be
 *                         obtained
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_default(krb5_context context, krb5_ccache *ccache);

/**
 * Copy a credential cache.
 *
 * @param [in]  context         Library context
 * @param [in]  incc            Credential cache to be copied
 * @param [out] outcc           Copy of credential cache to be filled in
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_copy_creds(krb5_context context, krb5_ccache incc, krb5_ccache outcc);

/**
 * Get a configuration value from a credential cache.
 *
 * @param [in]     context      Library context
 * @param [in]     id           Credential cache handle
 * @param [in]     principal    Configuration for this principal;
 *                              if NULL, global for the whole cache
 * @param [in]     key          Name of config variable
 * @param [out]    data         Data to be fetched
 *
 * Use krb5_free_data_contents() to free @a data when it is no longer needed.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_get_config(krb5_context context, krb5_ccache id,
                   krb5_const_principal principal,
                   const char *key, krb5_data *data);

/**
 * Store a configuration value in a credential cache.
 *
 * @param [in]     context      Library context
 * @param [in]     id           Credential cache handle
 * @param [in]     principal    Configuration for a specific principal;
 *                              if NULL, global for the whole cache
 * @param [in]     key          Name of config variable
 * @param [in]     data         Data to store, or NULL to remove
 *
 * @note Existing configuration under the same key is over-written.
 *
 * @warning Before version 1.10 @a data was assumed to be always non-null.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_set_config(krb5_context context, krb5_ccache id,
                   krb5_const_principal principal,
                   const char *key, krb5_data *data);

/**
 * Test whether a principal is a configuration principal.
 *
 * @param [in] context          Library context
 * @param [in] principal        Principal to check
 *
 * @return
 * @c TRUE if the principal is a configuration principal (generated part of
 * krb5_cc_set_config()); @c FALSE otherwise.
 */
krb5_boolean KRB5_CALLCONV
krb5_is_config_principal(krb5_context context, krb5_const_principal principal);

/**
 * Make a credential cache the primary cache for its collection.
 *
 * @param [in] context          Library context
 * @param [in] cache            Credential cache handle
 *
 * If the type of @a cache supports it, set @a cache to be the primary
 * credential cache for the collection it belongs to.
 *
 * @retval
 * 0  Success, or the type of @a cache doesn't support switching
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_switch(krb5_context context, krb5_ccache cache);

/**
 * Determine whether a credential cache type supports switching.
 *
 * @param [in] context          Library context
 * @param [in] type             Credential cache type
 *
 * @version New in 1.10
 *
 * @retval TRUE if @a type supports switching
 * @retval FALSE if it does not or is not a valid credential cache type.
 */
krb5_boolean KRB5_CALLCONV
krb5_cc_support_switch(krb5_context context, const char *type);

/**
 * Find a credential cache with a specified client principal.
 *
 * @param [in]  context         Library context
 * @param [in]  client          Client principal
 * @param [out] cache_out       Credential cache handle
 *
 * Find a cache within the collection whose default principal is @a client.
 * Use @a krb5_cc_close to close @a ccache when it is no longer needed.
 *
 * @retval 0 Success
 * @retval KRB5_CC_NOTFOUND
 *
 * @sa krb5_cccol_cursor_new
 *
 * @version New in 1.10
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_cache_match(krb5_context context, krb5_principal client,
                    krb5_ccache *cache_out);

/**
 * Select a credential cache to use with a server principal.
 *
 * @param [in]  context         Library context
 * @param [in]  server          Server principal
 * @param [out] cache_out       Credential cache handle
 * @param [out] princ_out       Client principal
 *
 * Select a cache within the collection containing credentials most appropriate
 * for use with @a server, according to configured rules and heuristics.
 *
 * Use krb5_cc_close() to release @a cache_out when it is no longer needed.
 * Use krb5_free_principal() to release @a princ_out when it is no longer
 * needed.  Note that @a princ_out is set in some error conditions.
 *
 * @return
 * If an appropriate cache is found, 0 is returned, @a cache_out is set to the
 * selected cache, and @a princ_out is set to the default principal of that
 * cache.
 *
 * If the appropriate client principal can be authoritatively determined but
 * the cache collection contains no credentials for that principal, then
 * KRB5_CC_NOTFOUND is returned, @a cache_out is set to NULL, and @a princ_out
 * is set to the appropriate client principal.
 *
 * If no configured mechanism can determine the appropriate cache or principal,
 * KRB5_CC_NOTFOUND is returned and @a cache_out and @a princ_out are set to
 * NULL.
 *
 * Any other error code indicates a fatal error in the processing of a cache
 * selection mechanism.
 *
 * @version New in 1.10
 */
krb5_error_code KRB5_CALLCONV
krb5_cc_select(krb5_context context, krb5_principal server,
               krb5_ccache *cache_out, krb5_principal *princ_out);

/* krb5_free.c */
/**
 * Free the storage assigned to a principal.
 *
 * @param [in] context          Library context
 * @param [in] val              Principal to be freed
 */
void KRB5_CALLCONV
krb5_free_principal(krb5_context context, krb5_principal val);

/**
 * Free a krb5_authenticator structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Authenticator structure to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_authenticator(krb5_context context, krb5_authenticator *val);

/**
 * Free the data stored in array of addresses.
 *
 * @param [in] context          Library context
 * @param [in] val              Array of addresses to be freed
 *
 * This function frees the contents of @a val and the array itself.
 *
 * @note The last entry in the array must be a NULL pointer.
 */
void KRB5_CALLCONV
krb5_free_addresses(krb5_context context, krb5_address **val);

/**
 * Free the storage assigned to array of authentication data.
 *
 * @param [in] context          Library context
 * @param [in] val              Array of authentication data to be freed
 *
 * This function frees the contents of @a val and the array itself.
 *
 * @note The last entry in the array must be a NULL pointer.
 */
void KRB5_CALLCONV
krb5_free_authdata(krb5_context context, krb5_authdata **val);

/**
 * Free a ticket.
 *
 * @param [in] context          Library context
 * @param [in] val              Ticket to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_ticket(krb5_context context, krb5_ticket *val);

/**
 * Free an error allocated by krb5_read_error() or krb5_sendauth().
 *
 * @param [in] context          Library context
 * @param [in] val              Error data structure to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_error(krb5_context context, krb5_error *val);

/**
 * Free a krb5_creds structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Credential structure to be freed.
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_creds(krb5_context context, krb5_creds *val);

/**
 * Free the contents of a krb5_creds structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Credential structure to free contents of
 *
 * This function frees the contents of @a val, but not the structure itself.
 */
void KRB5_CALLCONV
krb5_free_cred_contents(krb5_context context, krb5_creds *val);

/**
 * Free a krb5_checksum structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Checksum structure to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_checksum(krb5_context context, krb5_checksum *val);

/**
 * Free the contents of a krb5_checksum structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Checksum structure to free contents of
 *
 * This function frees the contents of @a val, but not the structure itself.
 * It sets the checksum's data pointer to null and (beginning in release 1.19)
 * sets its length to zero.
 */
void KRB5_CALLCONV
krb5_free_checksum_contents(krb5_context context, krb5_checksum *val);

/**
 * Free a krb5_keyblock structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Keyblock to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_keyblock(krb5_context context, krb5_keyblock *val);

/**
 * Free the contents of a krb5_keyblock structure.
 *
 * @param [in] context          Library context
 * @param [in] key              Keyblock to be freed
 *
 * This function frees the contents of @a key, but not the structure itself.
 */
void KRB5_CALLCONV
krb5_free_keyblock_contents(krb5_context context, krb5_keyblock *key);

/**
 * Free a krb5_ap_rep_enc_part structure.
 *
 * @param [in] context          Library context
 * @param [in] val              AP-REP enc part to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_ap_rep_enc_part(krb5_context context, krb5_ap_rep_enc_part *val);

/**
 * Free a krb5_data structure.
 *
 * @param [in] context          Library context
 * @param [in] val              Data structure to be freed
 *
 * This function frees the contents of @a val and the structure itself.
 */
void KRB5_CALLCONV
krb5_free_data(krb5_context context, krb5_data *val);

/* Free a krb5_octet_data structure (should be unused). */
void KRB5_CALLCONV
krb5_free_octet_data(krb5_context context, krb5_octet_data *val);

/**
 * Free the contents of a krb5_data structure and zero the data field.
 *
 * @param [in] context          Library context
 * @param [in] val              Data structure to free contents of
 *
 * This function frees the contents of @a val, but not the structure itself.
 * It sets the structure's data pointer to null and (beginning in release 1.19)
 * sets its length to zero.
 */
void KRB5_CALLCONV
krb5_free_data_contents(krb5_context context, krb5_data *val);

/**
 * Free a string representation of a principal.
 *
 * @param [in] context          Library context
 * @param [in] val              Name string to be freed
 */
void KRB5_CALLCONV
krb5_free_unparsed_name(krb5_context context, char *val);

/**
 * Free a string allocated by a krb5 function.
 *
 * @param [in] context          Library context
 * @param [in] val              String to be freed
 *
 * @version New in 1.10
 */
void KRB5_CALLCONV
krb5_free_string(krb5_context context, char *val);

/**
 * Free an array of encryption types.
 *
 * @param [in] context          Library context
 * @param [in] val              Array of enctypes to be freed
 *
 * @version New in 1.12
 */
void KRB5_CALLCONV
krb5_free_enctypes(krb5_context context, krb5_enctype *val);

/**
 * Free an array of checksum types.
 *
 * @param [in] context          Library context
 * @param [in] val              Array of checksum types to be freed
 */
void KRB5_CALLCONV
krb5_free_cksumtypes(krb5_context context, krb5_cksumtype *val);

/* From krb5/os, but needed by the outside world */
/**
 * Retrieve the system time of day, in sec and ms, since the epoch.
 *
 * @param [in]  context         Library context
 * @param [out] seconds         System timeofday, seconds portion
 * @param [out] microseconds    System timeofday, microseconds portion
 *
 * This function retrieves the system time of day with the context
 * specific time offset adjustment.
 *
 * @sa krb5_crypto_us_timeofday()
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_us_timeofday(krb5_context context,
                  krb5_timestamp *seconds, krb5_int32 *microseconds);

/**
 * Retrieve the current time with context specific time offset adjustment.
 *
 * @param [in]  context         Library context
 * @param [out] timeret         Timestamp to fill in
 *
 * This function retrieves the system time of day with the context specific
 * time offset adjustment.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_timeofday(krb5_context context, krb5_timestamp *timeret);

/**
 * Check if a timestamp is within the allowed clock skew of the current time.
 *
 * @param [in]     context      Library context
 * @param [in]     date         Timestamp to check
 *
 * This function checks if @a date is close enough to the current time
 * according to the configured allowable clock skew.
 *
 * @version New in 1.10
 *
 * @retval 0 Success
 * @retval KRB5KRB_AP_ERR_SKEW @a date is not within allowable clock skew
 */
krb5_error_code KRB5_CALLCONV
krb5_check_clockskew(krb5_context context, krb5_timestamp date);

/**
 * Return all interface addresses for this host.
 *
 * @param [in]  context         Library context
 * @param [out] addr            Array of krb5_address pointers, ending with
 *                              NULL
 *
 * Use krb5_free_addresses() to free @a addr when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_os_localaddr(krb5_context context, krb5_address ***addr);

/**
 * Retrieve the default realm.
 *
 * @param [in]  context         Library context
 * @param [out] lrealm          Default realm name
 *
 * Retrieves the default realm to be used if no user-specified realm is
 * available.
 *
 * Use krb5_free_default_realm() to free @a lrealm when it is no longer needed.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_default_realm(krb5_context context, char **lrealm);

/**
 * Override the default realm for the specified context.
 *
 * @param [in]     context      Library context
 * @param [in]     lrealm       Realm name for the default realm
 *
 * If @a lrealm is NULL, clear the default realm setting.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_set_default_realm(krb5_context context, const char *lrealm);

/**
 * Free a default realm string returned by krb5_get_default_realm().
 *
 * @param [in] context          Library context
 * @param [in] lrealm           Realm to be freed
 */
void KRB5_CALLCONV
krb5_free_default_realm(krb5_context context, char *lrealm);

/**
 * Canonicalize a hostname, possibly using name service.
 *
 * @param [in]  context         Library context
 * @param [in]  host            Input hostname
 * @param [out] canonhost_out   Canonicalized hostname
 *
 * This function canonicalizes orig_hostname, possibly using name service
 * lookups if configuration permits.  Use krb5_free_string() to free @a
 * canonhost_out when it is no longer needed.
 *
 * @version New in 1.15
 */
krb5_error_code KRB5_CALLCONV
krb5_expand_hostname(krb5_context context, const char *host,
                     char **canonhost_out);

/**
 * Generate a full principal name from a service name.
 *
 * @param [in]  context         Library context
 * @param [in]  hostname        Host name, or NULL to use local host
 * @param [in]  sname           Service name, or NULL to use @c "host"
 * @param [in]  type            Principal type
 * @param [out] ret_princ       Generated principal
 *
 * This function converts a @a hostname and @a sname into @a krb5_principal
 * structure @a ret_princ.  The returned principal will be of the form @a
 * sname\/hostname\@REALM where REALM is determined by krb5_get_host_realm().
 * In some cases this may be the referral (empty) realm.
 *
 * The @a type can be one of the following:
 *
 * @li #KRB5_NT_SRV_HST canonicalizes the host name before looking up the
 * realm and generating the principal.
 *
 * @li #KRB5_NT_UNKNOWN accepts the hostname as given, and does not
 * canonicalize it.
 *
 * Use krb5_free_principal to free @a ret_princ when it is no longer needed.
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_sname_to_principal(krb5_context context, const char *hostname, const char *sname,
                        krb5_int32 type, krb5_principal *ret_princ);

/**
 * Test whether a principal matches a matching principal.
 *
 * @param [in]  context         Library context
 * @param [in]  matching        Matching principal
 * @param [in]  princ           Principal to test
 *
 * @note A matching principal is a host-based principal with an empty realm
 * and/or second data component (hostname).  Profile configuration may cause
 * the hostname to be ignored even if it is present.  A principal matches a
 * matching principal if the former has the same non-empty (and non-ignored)
 * components of the latter.
 *
 * If @a matching is NULL, return TRUE.  If @a matching is not a matching
 * principal, return the value of krb5_principal_compare(context, matching,
 * princ).
 *
 * @return
 * TRUE if @a princ matches @a matching, FALSE otherwise.
 */
krb5_boolean KRB5_CALLCONV
krb5_sname_match(krb5_context context, krb5_const_principal matching,
                 krb5_const_principal princ);

/**
 * Change a password for an existing Kerberos account.
 *
 * @param [in]  context             Library context
 * @param [in]  creds               Credentials for kadmin/changepw service
 * @param [in]  newpw               New password
 * @param [out] result_code         Numeric error code from server
 * @param [out] result_code_string  String equivalent to @a result_code
 * @param [out] result_string       Change password response from the KDC
 *
 * Change the password for the existing principal identified by @a creds.
 *
 * The possible values of the output @a result_code are:
 *
 * @li #KRB5_KPASSWD_SUCCESS   (0) - success
 * @li #KRB5_KPASSWD_MALFORMED (1) - Malformed request error
 * @li #KRB5_KPASSWD_HARDERROR (2) - Server error
 * @li #KRB5_KPASSWD_AUTHERROR (3) - Authentication error
 * @li #KRB5_KPASSWD_SOFTERROR (4) - Password change rejected
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_change_password(krb5_context context, krb5_creds *creds,
                     const char *newpw, int *result_code,
                     krb5_data *result_code_string, krb5_data *result_string);

/**
 * Set a password for a principal using specified credentials.
 *
 * @param [in]  context              Library context
 * @param [in]  creds                Credentials for kadmin/changepw service
 * @param [in]  newpw                New password
 * @param [in]  change_password_for  Change the password for this principal
 * @param [out] result_code          Numeric error code from server
 * @param [out] result_code_string   String equivalent to @a result_code
 * @param [out] result_string        Data returned from the remote system
 *
 * This function uses the credentials @a creds to set the password @a newpw for
 * the principal @a change_password_for.  It implements the set password
 * operation of RFC 3244, for interoperability with Microsoft Windows
 * implementations.
 *
 * @note If @a change_password_for is NULL, the change is performed on the
 * current principal. If @a change_password_for is non-null, the change is
 * performed on the principal name passed in @a change_password_for.
 *
 * The error code and strings are returned in @a result_code,
 * @a result_code_string and @a result_string.
 *
 * @sa krb5_set_password_using_ccache()
 *
 * @retval
 * 0  Success and result_code is set to #KRB5_KPASSWD_SUCCESS.
 * @return
 * Kerberos error codes.
 */
krb5_error_code KRB5_CALLCONV
krb5_set_password(krb5_context context, krb5_creds *creds, const char *newpw,
                  krb5_principal change_password_for, int *result_code,
                  krb5_data *result_code_string, krb5_data *result_string);

/**
 * Set a password for a principal using cached credentials.
 *
 * @param [in]  context              Library context
 * @param [in]  ccache               Credential cache
 * @param [in]  newpw                New password
 * @param [in]  change_password_for  Change the password for this principal
 * @param [out] result_code          Numeric error code from server
 * @param [out] result_code_string   String equivalent to @a result_code
 * @param [out] result_string        Data returned from the remote system
 *
 * This function uses the cached credentials from @a ccache to set the password
 * @a newpw for the principal @a change_password_for.  It implements RFC 3244
 * set password operation (interoperable with MS Windows implementations) using
 * the credential cache.
 *
 * The error code and strings are returned in @a result_code,
 * @a result_code_string and @a result_string.
 *
 * @note If @a change_password_for is set to NULL, the change is performed on
 * the default principal in @a ccache. If @a change_password_for is non null,
 * the change is performed on the specified principal.
 *
 * @sa krb5_set_password()
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_set_password_using_ccache(krb5_context context, krb5_ccache ccache,
                               const char *newpw,
                               krb5_principal change_password_for,
                               int *result_code, krb5_data *result_code_string,
                               krb5_data *result_string);

/**
 * Get a result message for changing or setting a password.
 *
 * @param [in]  context            Library context
 * @param [in]  server_string      Data returned from the remote system
 * @param [out] message_out        A message displayable to the user
 *
 * This function processes the @a server_string returned in the @a
 * result_string parameter of krb5_change_password(), krb5_set_password(), and
 * related functions, and returns a displayable string.  If @a server_string
 * contains Active Directory structured policy information, it will be
 * converted into human-readable text.
 *
 * Use krb5_free_string() to free @a message_out when it is no longer needed.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 *
 * @version New in 1.11
 */
krb5_error_code KRB5_CALLCONV
krb5_chpw_message(krb5_context context, const krb5_data *server_string,
                  char **message_out);

/**
 * Retrieve configuration profile from the context.
 *
 * @param [in]  context         Library context
 * @param [out] profile         Pointer to data read from a configuration file
 *
 * This function creates a new @a profile object that reflects profile
 * in the supplied @a context.
 *
 * The @a profile object may be freed with profile_release() function.
 * See profile.h and profile API for more details.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_profile(krb5_context context, struct _profile_t ** profile);

#if KRB5_DEPRECATED
/** @deprecated Replaced by krb5_get_init_creds_password().*/
KRB5_ATTR_DEPRECATED krb5_error_code KRB5_CALLCONV
krb5_get_in_tkt_with_password(krb5_context context, krb5_flags options,
                              krb5_address *const *addrs, krb5_enctype *ktypes,
                              krb5_preauthtype *pre_auth_types,
                              const char *password, krb5_ccache ccache,
                              krb5_creds *creds, krb5_kdc_rep **ret_as_reply);

/** @deprecated Replaced by krb5_get_init_creds(). */
KRB5_ATTR_DEPRECATED krb5_error_code KRB5_CALLCONV
krb5_get_in_tkt_with_skey(krb5_context context, krb5_flags options,
                          krb5_address *const *addrs, krb5_enctype *ktypes,
                          krb5_preauthtype *pre_auth_types,
                          const krb5_keyblock *key, krb5_ccache ccache,
                          krb5_creds *creds, krb5_kdc_rep **ret_as_reply);

/** @deprecated Replaced by krb5_get_init_creds_keytab(). */
KRB5_ATTR_DEPRECATED krb5_error_code KRB5_CALLCONV
krb5_get_in_tkt_with_keytab(krb5_context context, krb5_flags options,
                            krb5_address *const *addrs, krb5_enctype *ktypes,
                            krb5_preauthtype *pre_auth_types,
                            krb5_keytab arg_keytab, krb5_ccache ccache,
                            krb5_creds *creds, krb5_kdc_rep **ret_as_reply);

#endif /* KRB5_DEPRECATED */

/**
 * Parse and decrypt a @c KRB_AP_REQ message.
 *
 * @param [in]     context        Library context
 * @param [in,out] auth_context   Pre-existing or newly created auth context
 * @param [in]     inbuf          AP-REQ message to be parsed
 * @param [in]     server         Matching principal for server, or NULL to
 *                                allow any principal in keytab
 * @param [in]     keytab         Key table, or NULL to use the default
 * @param [out]    ap_req_options If non-null, the AP-REQ flags on output
 * @param [out]    ticket         If non-null, ticket from the AP-REQ message
 *
 * This function parses, decrypts and verifies a AP-REQ message from @a inbuf
 * and stores the authenticator in @a auth_context.
 *
 * If a keyblock was specified in @a auth_context using
 * krb5_auth_con_setuseruserkey(), that key is used to decrypt the ticket in
 * AP-REQ message and @a keytab is ignored.  In this case, @a server should be
 * specified as a complete principal name to allow for proper transited-path
 * checking and replay cache selection.
 *
 * Otherwise, the decryption key is obtained from @a keytab, or from the
 * default keytab if it is NULL.  In this case, @a server may be a complete
 * principal name, a matching principal (see krb5_sname_match()), or NULL to
 * match any principal name.  The keys tried against the encrypted part of the
 * ticket are determined as follows:
 *
 * - If @a server is a complete principal name, then its entry in @a keytab is
 *   tried.
 * - Otherwise, if @a keytab is iterable, then all entries in @a keytab which
 *   match @a server are tried.
 * - Otherwise, the server principal in the ticket must match @a server, and
 *   its entry in @a keytab is tried.
 *
 * The client specified in the decrypted authenticator must match the client
 * specified in the decrypted ticket.
 *
 * If the @a remote_addr field of @a auth_context is set, the request must come
 * from that address.
 *
 * If a replay cache handle is provided in the @a auth_context, the
 * authenticator and ticket are verified against it.  If no conflict is found,
 * the new authenticator is then stored in the replay cache of @a auth_context.
 *
 * Various other checks are performed on the decoded data, including
 * cross-realm policy, clockskew, and ticket validation times.
 *
 * On success the authenticator, subkey, and remote sequence number of the
 * request are stored in @a auth_context. If the #AP_OPTS_MUTUAL_REQUIRED
 * bit is set, the local sequence number is XORed with the remote sequence
 * number in the request.
 *
 * Use krb5_free_ticket() to free @a ticket when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_req(krb5_context context, krb5_auth_context *auth_context,
            const krb5_data *inbuf, krb5_const_principal server,
            krb5_keytab keytab, krb5_flags *ap_req_options,
            krb5_ticket **ticket);

/**
 * Retrieve a service key from a key table.
 *
 * @param [in]  context     Library context
 * @param [in]  keyprocarg  Name of a key table (NULL to use default name)
 * @param [in]  principal   Service principal
 * @param [in]  vno         Key version number (0 for highest available)
 * @param [in]  enctype     Encryption type (0 for any type)
 * @param [out] key         Service key from key table
 *
 * Open and search the specified key table for the entry identified by @a
 * principal, @a enctype, and @a vno. If no key is found, return an error code.
 *
 * The default key table is used, unless @a keyprocarg is non-null.
 * @a keyprocarg designates a specific key table.
 *
 * Use krb5_free_keyblock() to free @a key when it is no longer needed.
 *
 * @retval
 * 0 Success
 * @return Kerberos error code if not found or @a keyprocarg is invalid.
 */
krb5_error_code KRB5_CALLCONV
krb5_kt_read_service_key(krb5_context context, krb5_pointer keyprocarg,
                         krb5_principal principal, krb5_kvno vno,
                         krb5_enctype enctype, krb5_keyblock **key);

/**
 * Format a @c KRB-SAFE message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  userdata        User data in the message
 * @param [out] der_out         Formatted @c KRB-SAFE buffer
 * @param [out] rdata_out       Replay data. Specify NULL if not needed
 *
 * This function creates an integrity protected @c KRB-SAFE message
 * using data supplied by the application.
 *
 * Fields in @a auth_context specify the checksum type, the keyblock that
 * can be used to seed the checksum, full addresses (host and port) for
 * the sender and receiver, and @ref KRB5_AUTH_CONTEXT flags.
 *
 * The local address in @a auth_context must be set, and is used to form the
 * sender address used in the KRB-SAFE message.  The remote address is
 * optional; if specified, it will be used to form the receiver address used in
 * the message.
 *
 * @note The @a rdata_out argument is required if the
 * #KRB5_AUTH_CONTEXT_RET_TIME or #KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set
 * in @a auth_context.
 *
 * If the #KRB5_AUTH_CONTEXT_DO_TIME flag is set in @a auth_context, a
 * timestamp is included in the KRB-SAFE message, and an entry for the message
 * is entered in an in-memory replay cache to detect if the message is
 * reflected by an attacker.  If #KRB5_AUTH_CONTEXT_DO_TIME is not set, no
 * replay cache is used.  If #KRB5_AUTH_CONTEXT_RET_TIME is set in @a
 * auth_context, a timestamp is included in the KRB-SAFE message and is stored
 * in @a rdata_out.
 *
 * If either #KRB5_AUTH_CONTEXT_DO_SEQUENCE or #KRB5_AUTH_CONTEXT_RET_SEQUENCE
 * is set, the @a auth_context local sequence number is included in the
 * KRB-SAFE message and then incremented.  If #KRB5_AUTH_CONTEXT_RET_SEQUENCE
 * is set, the sequence number used is stored in @a rdata_out.
 *
 * Use krb5_free_data_contents() to free @a der_out when it is no longer
 * needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_safe(krb5_context context, krb5_auth_context auth_context,
             const krb5_data *userdata, krb5_data *der_out,
             krb5_replay_data *rdata_out);

/**
 * Format a @c KRB-PRIV message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  userdata        User data for @c KRB-PRIV message
 * @param [out] der_out         Formatted @c KRB-PRIV message
 * @param [out] rdata_out       Replay data (NULL if not needed)
 *
 * This function is similar to krb5_mk_safe(), but the message is encrypted and
 * integrity-protected, not just integrity-protected.
 *
 * The local address in @a auth_context must be set, and is used to form the
 * sender address used in the KRB-PRIV message.  The remote address is
 * optional; if specified, it will be used to form the receiver address used in
 * the message.
 *
 * @note The @a rdata_out argument is required if the
 * #KRB5_AUTH_CONTEXT_RET_TIME or #KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set
 * in @a auth_context.
 *
 * If the #KRB5_AUTH_CONTEXT_DO_TIME flag is set in @a auth_context, a
 * timestamp is included in the KRB-PRIV message, and an entry for the message
 * is entered in an in-memory replay cache to detect if the message is
 * reflected by an attacker.  If #KRB5_AUTH_CONTEXT_DO_TIME is not set, no
 * replay cache is used.  If #KRB5_AUTH_CONTEXT_RET_TIME is set in @a
 * auth_context, a timestamp is included in the KRB-PRIV message and is stored
 * in @a rdata_out.
 *
 * If either #KRB5_AUTH_CONTEXT_DO_SEQUENCE or #KRB5_AUTH_CONTEXT_RET_SEQUENCE
 * is set, the @a auth_context local sequence number is included in the
 * KRB-PRIV message and then incremented.  If #KRB5_AUTH_CONTEXT_RET_SEQUENCE
 * is set, the sequence number used is stored in @a rdata_out.
 *
 * Use krb5_free_data_contents() to free @a der_out when it is no longer
 * needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_priv(krb5_context context, krb5_auth_context auth_context,
             const krb5_data *userdata, krb5_data *der_out,
             krb5_replay_data *rdata_out);

/**
 * Client function for @c sendauth protocol.
 *
 * @param [in]     context        Library context
 * @param [in,out] auth_context   Pre-existing or newly created auth context
 * @param [in]     fd             File descriptor that describes network socket
 * @param [in]     appl_version   Application protocol version to be matched
 *                                with the receiver's application version
 * @param [in]     client         Client principal
 * @param [in]     server         Server principal
 * @param [in]     ap_req_options @ref AP_OPTS options
 * @param [in]     in_data        Data to be sent to the server
 * @param [in]     in_creds       Input credentials, or NULL to use @a ccache
 * @param [in]     ccache         Credential cache
 * @param [out]    error          If non-null, contains KRB_ERROR message
 *                                returned from server
 * @param [out]    rep_result     If non-null and @a ap_req_options is
 *                                #AP_OPTS_MUTUAL_REQUIRED, contains the result
 *                                of mutual authentication exchange
 * @param [out]    out_creds      If non-null, the retrieved credentials
 *
 * This function performs the client side of a sendauth/recvauth exchange by
 * sending and receiving messages over @a fd.
 *
 * Credentials may be specified in three ways:
 *
 * @li If @a in_creds is NULL, credentials are obtained with
 * krb5_get_credentials() using the principals @a client and @a server.  @a
 * server must be non-null; @a client may NULL to use the default principal of
 * @a ccache.
 *
 * @li If @a in_creds is non-null, but does not contain a ticket, credentials
 * for the exchange are obtained with krb5_get_credentials() using @a in_creds.
 * In this case, the values of @a client and @a server are unused.
 *
 * @li If @a in_creds is a complete credentials structure, it used directly.
 * In this case, the values of @a client, @a server, and @a ccache are unused.
 *
 * If the server is using a different application protocol than that specified
 * in @a appl_version, an error will be returned.
 *
 * Use krb5_free_creds() to free @a out_creds, krb5_free_ap_rep_enc_part() to
 * free @a rep_result, and krb5_free_error() to free @a error when they are no
 * longer needed.
 *
 * @sa krb5_recvauth()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_sendauth(krb5_context context, krb5_auth_context *auth_context,
              krb5_pointer fd, char *appl_version, krb5_principal client,
              krb5_principal server, krb5_flags ap_req_options,
              krb5_data *in_data, krb5_creds *in_creds, krb5_ccache ccache,
              krb5_error **error, krb5_ap_rep_enc_part **rep_result,
              krb5_creds **out_creds);

/**
 * Server function for @a sendauth protocol.
 *
 * @param [in]     context      Library context
 * @param [in,out] auth_context Pre-existing or newly created auth context
 * @param [in]     fd           File descriptor
 * @param [in]     appl_version Application protocol version to be matched
 *                              against the client's application version
 * @param [in]     server       Server principal (NULL for any in @a keytab)
 * @param [in]     flags        Additional specifications
 * @param [in]     keytab       Key table containing service keys
 * @param [out]    ticket       Ticket (NULL if not needed)
 *
 * This function performs the server side of a sendauth/recvauth exchange by
 * sending and receiving messages over @a fd.
 *
 * Use krb5_free_ticket() to free @a ticket when it is no longer needed.
 *
 * @sa krb5_sendauth()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_recvauth(krb5_context context, krb5_auth_context *auth_context,
              krb5_pointer fd, char *appl_version, krb5_principal server,
              krb5_int32 flags, krb5_keytab keytab, krb5_ticket **ticket);

/**
 * Server function for @a sendauth protocol with version parameter.
 *
 * @param [in]     context      Library context
 * @param [in,out] auth_context Pre-existing or newly created auth context
 * @param [in]     fd           File descriptor
 * @param [in]     server       Server principal (NULL for any in @a keytab)
 * @param [in]     flags        Additional specifications
 * @param [in]     keytab       Decryption key
 * @param [out]    ticket       Ticket (NULL if not needed)
 * @param [out]    version      sendauth protocol version (NULL if not needed)
 *
 * This function is similar to krb5_recvauth() with the additional output
 * information place into @a version.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_recvauth_version(krb5_context context,
                      krb5_auth_context *auth_context,
                      krb5_pointer fd,
                      krb5_principal server,
                      krb5_int32 flags,
                      krb5_keytab keytab,
                      krb5_ticket **ticket,
                      krb5_data *version);

/**
 * Format a @c KRB-CRED message for an array of credentials.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  creds           Null-terminated array of credentials
 * @param [out] der_out         Encoded credentials
 * @param [out] rdata_out       Replay cache information (NULL if not needed)
 *
 * This function takes an array of credentials @a creds and formats
 * a @c KRB-CRED message @a der_out to pass to krb5_rd_cred().
 *
 * The local and remote addresses in @a auth_context are optional; if either is
 * specified, they are used to form the sender and receiver addresses in the
 * KRB-CRED message.
 *
 * @note The @a rdata_out argument is required if the
 * #KRB5_AUTH_CONTEXT_RET_TIME or #KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set
 * in @a auth_context.
 *
 * If the #KRB5_AUTH_CONTEXT_DO_TIME flag is set in @a auth_context, an entry
 * for the message is entered in an in-memory replay cache to detect if the
 * message is reflected by an attacker.  If #KRB5_AUTH_CONTEXT_DO_TIME is not
 * set, no replay cache is used.  If #KRB5_AUTH_CONTEXT_RET_TIME is set in @a
 * auth_context, the timestamp used for the KRB-CRED message is stored in @a
 * rdata_out.
 *
 * If either #KRB5_AUTH_CONTEXT_DO_SEQUENCE or #KRB5_AUTH_CONTEXT_RET_SEQUENCE
 * is set, the @a auth_context local sequence number is included in the
 * KRB-CRED message and then incremented.  If #KRB5_AUTH_CONTEXT_RET_SEQUENCE
 * is set, the sequence number used is stored in @a rdata_out.
 *
 * Use krb5_free_data_contents() to free @a der_out when it is no longer
 * needed.
 *
 * The message will be encrypted using the send subkey of @a auth_context if it
 * is present, or the session key otherwise.  If neither key is present, the
 * credentials will not be encrypted, and the message should only be sent over
 * a secure channel.  No replay cache entry is used in this case.
 *
 * @retval
 *  0 Success
 * @retval
 *  ENOMEM Insufficient memory
 * @retval
 *   KRB5_RC_REQUIRED Message replay detection requires @a rcache parameter
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_ncred(krb5_context context, krb5_auth_context auth_context,
              krb5_creds **creds, krb5_data **der_out,
              krb5_replay_data *rdata_out);

/**
 * Format a @c KRB-CRED message for a single set of credentials.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  creds           Pointer to credentials
 * @param [out] der_out         Encoded credentials
 * @param [out] rdata_out       Replay cache data (NULL if not needed)
 *
 * This is a convenience function that calls krb5_mk_ncred() with a single set
 * of credentials.
 *
 * @retval
 * 0 Success
 * @retval
 *  ENOMEM Insufficient memory
 * @retval
 *  KRB5_RC_REQUIRED   Message replay detection requires @a rcache parameter
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_mk_1cred(krb5_context context, krb5_auth_context auth_context,
              krb5_creds *creds, krb5_data **der_out,
              krb5_replay_data *rdata_out);

/**
 * Read and validate a @c KRB-CRED message.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [in]  creddata        @c KRB-CRED message
 * @param [out] creds_out       Null-terminated array of forwarded credentials
 * @param [out] rdata_out       Replay data (NULL if not needed)
 *
 * @note The @a rdata_out argument is required if the
 * #KRB5_AUTH_CONTEXT_RET_TIME or #KRB5_AUTH_CONTEXT_RET_SEQUENCE flag is set
 * in @a auth_context.`
 *
 * @a creddata will be decrypted using the receiving subkey if it is present in
 * @a auth_context, or the session key if the receiving subkey is not present
 * or fails to decrypt the message.
 *
 * Use krb5_free_tgt_creds() to free @a creds_out when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_rd_cred(krb5_context context, krb5_auth_context auth_context,
             krb5_data *creddata, krb5_creds ***creds_out,
             krb5_replay_data *rdata_out);

/**
 * Get a forwarded TGT and format a @c KRB-CRED message.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] rhost            Remote host
 * @param [in] client           Client principal of TGT
 * @param [in] server           Principal of server to receive TGT
 * @param [in] cc               Credential cache handle (NULL to use default)
 * @param [in] forwardable      Whether TGT should be forwardable
 * @param [out] outbuf          KRB-CRED message
 *
 * Get a TGT for use at the remote host @a rhost and format it into a KRB-CRED
 * message.  If @a rhost is NULL and @a server is of type #KRB5_NT_SRV_HST,
 * the second component of @a server will be used.
 *
 * @retval
 *  0 Success
 * @retval
 *   ENOMEM Insufficient memory
 * @retval
 *   KRB5_PRINC_NOMATCH Requested principal and ticket do not match
 * @retval
 *   KRB5_NO_TKT_SUPPLIED Request did not supply a ticket
 * @retval
 *   KRB5_CC_BADNAME Credential cache name or principal name malformed
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_fwd_tgt_creds(krb5_context context, krb5_auth_context auth_context,
                   const char *rhost, krb5_principal client,
                   krb5_principal server, krb5_ccache cc, int forwardable,
                   krb5_data *outbuf);

/**
 * Create and initialize an authentication context.
 *
 * @param [in]  context         Library context
 * @param [out] auth_context    Authentication context
 *
 * This function creates an authentication context to hold configuration and
 * state relevant to krb5 functions for authenticating principals and
 * protecting messages once authentication has occurred.
 *
 * By default, flags for the context are set to enable the use of the replay
 * cache (#KRB5_AUTH_CONTEXT_DO_TIME), but not sequence numbers.  Use
 * krb5_auth_con_setflags() to change the flags.
 *
 * The allocated @a auth_context must be freed with krb5_auth_con_free() when
 * it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_init(krb5_context context, krb5_auth_context *auth_context);

/**
 * Free a krb5_auth_context structure.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context to be freed
 *
 * This function frees an auth context allocated by krb5_auth_con_init().
 *
 * @retval 0  (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_free(krb5_context context, krb5_auth_context auth_context);

/**
 * Set a flags field in a krb5_auth_context structure.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] flags            Flags bit mask
 *
 * Valid values for @a flags are:
 * @li #KRB5_AUTH_CONTEXT_DO_TIME Use timestamps
 * @li #KRB5_AUTH_CONTEXT_RET_TIME Save timestamps
 * @li #KRB5_AUTH_CONTEXT_DO_SEQUENCE Use sequence numbers
 * @li #KRB5_AUTH_CONTEXT_RET_SEQUENCE Save sequence numbers
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setflags(krb5_context context, krb5_auth_context auth_context, krb5_int32 flags);

/**
 * Retrieve flags from a krb5_auth_context structure.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] flags           Flags bit mask
 *
 * Valid values for @a flags are:
 * @li #KRB5_AUTH_CONTEXT_DO_TIME Use timestamps
 * @li #KRB5_AUTH_CONTEXT_RET_TIME Save timestamps
 * @li #KRB5_AUTH_CONTEXT_DO_SEQUENCE Use sequence numbers
 * @li #KRB5_AUTH_CONTEXT_RET_SEQUENCE Save sequence numbers
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getflags(krb5_context context, krb5_auth_context auth_context,
                       krb5_int32 *flags);

/**
 * Set a checksum callback in an auth context.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] func             Checksum callback
 * @param [in] data             Callback argument
 *
 * Set a callback to obtain checksum data in krb5_mk_req().  The callback will
 * be invoked after the subkey and local sequence number are stored in @a
 * auth_context.
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_set_checksum_func( krb5_context context,
                                 krb5_auth_context  auth_context,
                                 krb5_mk_req_checksum_func func,
                                 void *data);

/**
 * Get the checksum callback from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] func            Checksum callback
 * @param [out] data            Callback argument
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_get_checksum_func( krb5_context context,
                                 krb5_auth_context auth_context,
                                 krb5_mk_req_checksum_func *func,
                                 void **data);

/**
 * Set the local and remote addresses in an auth context.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] local_addr       Local address
 * @param [in] remote_addr      Remote address
 *
 * This function releases the storage assigned to the contents of the local and
 * remote addresses of @a auth_context and then sets them to @a local_addr and
 * @a remote_addr respectively.
 *
 * @sa krb5_auth_con_genaddrs()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV_WRONG
krb5_auth_con_setaddrs(krb5_context context, krb5_auth_context auth_context,
                       krb5_address *local_addr, krb5_address *remote_addr);

/**
 * Retrieve address fields from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] local_addr      Local address (NULL if not needed)
 * @param [out] remote_addr     Remote address (NULL if not needed)
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getaddrs(krb5_context context, krb5_auth_context auth_context,
                       krb5_address **local_addr, krb5_address **remote_addr);

/**
 * Set local and remote port fields in an auth context.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] local_port       Local port
 * @param [in] remote_port      Remote port
 *
 * This function releases the storage assigned to the contents of the local and
 * remote ports of @a auth_context and then sets them to @a local_port and @a
 * remote_port respectively.
 *
 * @sa krb5_auth_con_genaddrs()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setports(krb5_context context, krb5_auth_context auth_context,
                       krb5_address *local_port, krb5_address *remote_port);

/**
 * Set the session key in an auth context.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] keyblock         User key
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setuseruserkey(krb5_context context, krb5_auth_context auth_context,
                             krb5_keyblock *keyblock);

/**
 * Retrieve the session key from an auth context as a keyblock.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] keyblock        Session key
 *
 * This function creates a keyblock containing the session key from @a
 * auth_context.  Use krb5_free_keyblock() to free @a keyblock when it is no
 * longer needed
 *
 * @retval 0 Success. Otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getkey(krb5_context context, krb5_auth_context auth_context,
                     krb5_keyblock **keyblock);

/**
 * Retrieve the session key from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] key             Session key
 *
 * This function sets @a key to the session key from @a auth_context.  Use
 * krb5_k_free_key() to release @a key when it is no longer needed.
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getkey_k(krb5_context context, krb5_auth_context auth_context,
                       krb5_key *key);

/**
 * Retrieve the send subkey from an auth context as a keyblock.
 *
 * @param [in]  ctx             Library context
 * @param [in]  ac              Authentication context
 * @param [out] keyblock        Send subkey
 *
 * This function creates a keyblock containing the send subkey from @a
 * auth_context.  Use krb5_free_keyblock() to free @a keyblock when it is no
 * longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getsendsubkey(krb5_context ctx, krb5_auth_context ac, krb5_keyblock **keyblock);

/**
 * Retrieve the send subkey from an auth context.
 *
 * @param [in]  ctx             Library context
 * @param [in]  ac              Authentication context
 * @param [out] key             Send subkey
 *
 * This function sets @a key to the send subkey from @a auth_context.  Use
 * krb5_k_free_key() to release @a key when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getsendsubkey_k(krb5_context ctx, krb5_auth_context ac,
                              krb5_key *key);

/**
 * Retrieve the receiving subkey from an auth context as a keyblock.
 *
 * @param [in]  ctx             Library context
 * @param [in]  ac              Authentication context
 * @param [out] keyblock        Receiving subkey
 *
 * This function creates a keyblock containing the receiving subkey from @a
 * auth_context.  Use krb5_free_keyblock() to free @a keyblock when it is no
 * longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getrecvsubkey(krb5_context ctx, krb5_auth_context ac, krb5_keyblock **keyblock);

/**
 * Retrieve the receiving subkey from an auth context as a keyblock.
 *
 * @param [in]  ctx             Library context
 * @param [in]  ac              Authentication context
 * @param [out] key             Receiving subkey
 *
 * This function sets @a key to the receiving subkey from @a auth_context.  Use
 * krb5_k_free_key() to release @a key when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getrecvsubkey_k(krb5_context ctx, krb5_auth_context ac, krb5_key *key);

/**
 * Set the send subkey in an auth context with a keyblock.
 *
 * @param [in] ctx              Library context
 * @param [in] ac               Authentication context
 * @param [in] keyblock         Send subkey
 *
 * This function sets the send subkey in @a ac to a copy of @a keyblock.
 *
 * @retval 0 Success. Otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setsendsubkey(krb5_context ctx, krb5_auth_context ac,
                            krb5_keyblock *keyblock);

/**
 * Set the send subkey in an auth context.
 *
 * @param [in]  ctx             Library context
 * @param [in]  ac              Authentication context
 * @param [out] key             Send subkey
 *
 * This function sets the send subkey in @a ac to @a key, incrementing its
 * reference count.
 *
 * @version New in 1.9
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setsendsubkey_k(krb5_context ctx, krb5_auth_context ac, krb5_key key);

/**
 * Set the receiving subkey in an auth context with a keyblock.
 *
 * @param [in] ctx              Library context
 * @param [in] ac               Authentication context
 * @param [in] keyblock         Receiving subkey
 *
 * This function sets the receiving subkey in @a ac to a copy of @a keyblock.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setrecvsubkey(krb5_context ctx, krb5_auth_context ac,
                            krb5_keyblock *keyblock);

/**
 * Set the receiving subkey in an auth context.
 *
 * @param [in] ctx              Library context
 * @param [in] ac               Authentication context
 * @param [in] key              Receiving subkey
 *
 * This function sets the receiving subkey in @a ac to @a key, incrementing its
 * reference count.
 *
 * @version New in 1.9
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setrecvsubkey_k(krb5_context ctx, krb5_auth_context ac,
                              krb5_key key);

#if KRB5_DEPRECATED
/** @deprecated Replaced by krb5_auth_con_getsendsubkey(). */
KRB5_ATTR_DEPRECATED krb5_error_code KRB5_CALLCONV
krb5_auth_con_getlocalsubkey(krb5_context context, krb5_auth_context auth_context,
                             krb5_keyblock **keyblock);

/** @deprecated Replaced by krb5_auth_con_getrecvsubkey(). */
KRB5_ATTR_DEPRECATED krb5_error_code KRB5_CALLCONV
krb5_auth_con_getremotesubkey(krb5_context context, krb5_auth_context auth_context,
                              krb5_keyblock **keyblock);
#endif

/**
 * Retrieve the local sequence number from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] seqnumber       Local sequence number
 *
 * Retrieve the local sequence number from @a auth_context and return it in @a
 * seqnumber.  The #KRB5_AUTH_CONTEXT_DO_SEQUENCE flag must be set in @a
 * auth_context for this function to be useful.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getlocalseqnumber(krb5_context context, krb5_auth_context auth_context,
                                krb5_int32 *seqnumber);

/**
 * Retrieve the remote sequence number from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] seqnumber       Remote sequence number
 *
 * Retrieve the remote sequence number from @a auth_context and return it in @a
 * seqnumber.  The #KRB5_AUTH_CONTEXT_DO_SEQUENCE flag must be set in @a
 * auth_context for this function to be useful.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getremoteseqnumber(krb5_context context, krb5_auth_context auth_context,
                                 krb5_int32 *seqnumber);

/**
 * Cause an auth context to use cipher state.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 *
 * Prepare @a auth_context to use cipher state when krb5_mk_priv() or
 * krb5_rd_priv() encrypt or decrypt data.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_initivector(krb5_context context, krb5_auth_context auth_context);

/**
 * Set the replay cache in an auth context.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] rcache           Replay cache haddle
 *
 * This function sets the replay cache in @a auth_context to @a rcache.  @a
 * rcache will be closed when @a auth_context is freed, so the caller should
 * relinquish that responsibility.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_setrcache(krb5_context context, krb5_auth_context auth_context,
                        krb5_rcache rcache);

/**
 * Retrieve the replay cache from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] rcache          Replay cache handle
 *
 * This function fetches the replay cache from @a auth_context.  The caller
 * should not close @a rcache.
 *
 * @retval 0 (always)
 */
krb5_error_code KRB5_CALLCONV_WRONG
krb5_auth_con_getrcache(krb5_context context, krb5_auth_context auth_context,
                        krb5_rcache *rcache);

/**
 * Retrieve the authenticator from an auth context.
 *
 * @param [in]  context         Library context
 * @param [in]  auth_context    Authentication context
 * @param [out] authenticator   Authenticator
 *
 * Use krb5_free_authenticator() to free @a authenticator when it is no longer
 * needed.
 *
 * @retval 0 Success. Otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_getauthenticator(krb5_context context, krb5_auth_context auth_context,
                               krb5_authenticator **authenticator);

/**
 * Set checksum type in an an auth context.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] cksumtype        Checksum type
 *
 * This function sets the checksum type in @a auth_context to be used by
 * krb5_mk_req() for the authenticator checksum.
 *
 * @retval 0 Success. Otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_set_req_cksumtype(krb5_context context, krb5_auth_context auth_context,
                                krb5_cksumtype cksumtype);

#define KRB5_REALM_BRANCH_CHAR '.'

/*
 * end "func-proto.h"
 */

/*
 * begin stuff from libos.h
 */

/**
 * @brief Read a password from keyboard input.
 *
 * @param [in]     context      Library context
 * @param [in]     prompt       First user prompt when reading password
 * @param [in]     prompt2      Second user prompt (NULL to prompt only once)
 * @param [out]    return_pwd   Returned password
 * @param [in,out] size_return  On input, maximum size of password; on output,
 *                              size of password read
 *
 * This function reads a password from keyboard input and stores it in @a
 * return_pwd.  @a size_return should be set by the caller to the amount of
 * storage space available in @a return_pwd; on successful return, it will be
 * set to the length of the password read.
 *
 * @a prompt is printed to the terminal, followed by ": ", and then a password
 * is read from the keyboard.
 *
 * If @a prompt2 is NULL, the password is read only once.  Otherwise, @a
 * prompt2 is printed to the terminal and a second password is read.  If the
 * two passwords entered are not identical, KRB5_LIBOS_BADPWDMATCH is returned.
 *
 * Echoing is turned off when the password is read.
 *
 * @retval
 *  0   Success
 * @return
 * Error in reading or verifying the password
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_read_password(krb5_context context,
                   const char *prompt, const char *prompt2,
                   char *return_pwd, unsigned int *size_return);

/**
 * Convert a principal name to a local name.
 *
 * @param [in]  context         Library context
 * @param [in]  aname           Principal name
 * @param [in]  lnsize_in       Space available in @a lname
 * @param [out] lname           Local name buffer to be filled in
 *
 * If @a aname does not correspond to any local account, KRB5_LNAME_NOTRANS is
 * returned.  If @a lnsize_in is too small for the local name,
 * KRB5_CONFIG_NOTENUFSPACE is returned.
 *
 * Local names, rather than principal names, can be used by programs that
 * translate to an environment-specific name (for example, a user account
 * name).
 *
 * @retval
 * 0  Success
 * @retval
 *  System errors
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_aname_to_localname(krb5_context context, krb5_const_principal aname,
                        int lnsize_in, char *lname);

/**
 * Get the Kerberos realm names for a host.
 *
 * @param [in]  context         Library context
 * @param [in]  host            Host name (or NULL)
 * @param [out] realmsp         Null-terminated list of realm names
 *
 * Fill in @a realmsp with a pointer to a null-terminated list of realm names.
 * If there are no known realms for the host, a list containing the referral
 * (empty) realm is returned.
 *
 * If @a host is NULL, the local host's realms are determined.
 *
 * Use krb5_free_host_realm() to release @a realmsp when it is no longer
 * needed.
 *
 * @retval
 *  0   Success
 * @retval
 *  ENOMEM  Insufficient memory
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_host_realm(krb5_context context, const char *host, char ***realmsp);

/**
 *
 * @param [in] context           Library context
 * @param [in] hdata             Host name (or NULL)
 * @param [out] realmsp          Null-terminated list of realm names
 *
 * Fill in @a realmsp with a pointer to a null-terminated list of realm names
 * obtained through heuristics or insecure resolution methods which have lower
 * priority than KDC referrals.
 *
 * If @a host is NULL, the local host's realms are determined.
 *
 * Use krb5_free_host_realm() to release @a realmsp when it is no longer
 * needed.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_fallback_host_realm(krb5_context context,
                             krb5_data *hdata, char ***realmsp);

/**
 * Free the memory allocated by krb5_get_host_realm().
 *
 * @param [in] context          Library context
 * @param [in] realmlist        List of realm names to be released
 *
 * @retval
 * 0  Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_free_host_realm(krb5_context context, char *const *realmlist);

/**
 * Determine if a principal is authorized to log in as a local user.
 *
 * @param [in] context          Library context
 * @param [in] principal        Principal name
 * @param [in] luser            Local username
 *
 * Determine whether @a principal is authorized to log in as a local user @a
 * luser.
 *
 * @retval
 * TRUE Principal is authorized to log in as user; FALSE otherwise.
 */
krb5_boolean KRB5_CALLCONV
krb5_kuserok(krb5_context context, krb5_principal principal, const char *luser);

/**
 * Generate auth context addresses from a connected socket.
 *
 * @param [in] context          Library context
 * @param [in] auth_context     Authentication context
 * @param [in] infd             Connected socket descriptor
 * @param [in] flags            Flags
 *
 * This function sets the local and/or remote addresses in @a auth_context
 * based on the local and remote endpoints of the socket @a infd.  The
 * following flags determine the operations performed:
 *
 * @li #KRB5_AUTH_CONTEXT_GENERATE_LOCAL_ADDR   Generate local address.
 * @li #KRB5_AUTH_CONTEXT_GENERATE_REMOTE_ADDR  Generate remote address.
 * @li #KRB5_AUTH_CONTEXT_GENERATE_LOCAL_FULL_ADDR  Generate local address and port.
 * @li #KRB5_AUTH_CONTEXT_GENERATE_REMOTE_FULL_ADDR Generate remote address and port.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_auth_con_genaddrs(krb5_context context, krb5_auth_context auth_context,
                       int infd, int flags);

/**
 * Set time offset field in a krb5_context structure.
 *
 * @param [in] context          Library context
 * @param [in] seconds          Real time, seconds portion
 * @param [in] microseconds     Real time, microseconds portion
 *
 * This function sets the time offset in @a context to the difference between
 * the system time and the real time as determined by @a seconds and @a
 * microseconds.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_set_real_time(krb5_context context, krb5_timestamp seconds,
                   krb5_int32 microseconds);

/**
 * Return the time offsets from the os context.
 *
 * @param [in]  context         Library context
 * @param [out] seconds         Time offset, seconds portion
 * @param [out] microseconds    Time offset, microseconds portion
 *
 * This function returns the time offsets in @a context.
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_time_offsets(krb5_context context, krb5_timestamp *seconds, krb5_int32 *microseconds);

/* str_conv.c */
/**
 * Convert a string to an encryption type.
 *
 * @param [in]  string          String to convert to an encryption type
 * @param [out] enctypep        Encryption type
 *
 * @retval 0  Success; otherwise - EINVAL
 */
krb5_error_code KRB5_CALLCONV
krb5_string_to_enctype(char *string, krb5_enctype *enctypep);

/**
 * Convert a string to a salt type.
 *
 * @param [in]  string          String to convert to an encryption type
 * @param [out] salttypep       Salt type to be filled in
 *
 * @retval 0  Success; otherwise - EINVAL
 */
krb5_error_code KRB5_CALLCONV
krb5_string_to_salttype(char *string, krb5_int32 *salttypep);

/**
 * Convert a string to a checksum type.
 *
 * @param [in]  string          String to be converted
 * @param [out] cksumtypep      Checksum type to be filled in
 *
 * @retval 0  Success; otherwise - EINVAL
 */
krb5_error_code KRB5_CALLCONV
krb5_string_to_cksumtype(char *string, krb5_cksumtype *cksumtypep);

/**
 * Convert a string to a timestamp.
 *
 * @param [in]  string          String to be converted
 * @param [out] timestampp      Pointer to timestamp
 *
 * @retval 0  Success; otherwise - EINVAL
 */
krb5_error_code KRB5_CALLCONV
krb5_string_to_timestamp(char *string, krb5_timestamp *timestampp);

/**
 * Convert a string to a delta time value.
 *
 * @param [in]  string          String to be converted
 * @param [out] deltatp         Delta time to be filled in
 *
 * @retval 0  Success; otherwise - KRB5_DELTAT_BADFORMAT
 */
krb5_error_code KRB5_CALLCONV
krb5_string_to_deltat(char *string, krb5_deltat *deltatp);

/**
 * Convert an encryption type to a string.
 *
 * @param [in]  enctype         Encryption type
 * @param [out] buffer          Buffer to hold encryption type string
 * @param [in]  buflen          Storage available in @a buffer
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_enctype_to_string(krb5_enctype enctype, char *buffer, size_t buflen);

/**
 * Convert an encryption type to a name or alias.
 *
 * @param [in]  enctype         Encryption type
 * @param [in]  shortest        Flag
 * @param [out] buffer          Buffer to hold encryption type string
 * @param [in]  buflen          Storage available in @a buffer
 *
 * If @a shortest is FALSE, this function returns the enctype's canonical name
 * (like "aes128-cts-hmac-sha1-96").  If @a shortest is TRUE, it return the
 * enctype's shortest alias (like "aes128-cts").
 *
 * @version New in 1.9
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_enctype_to_name(krb5_enctype enctype, krb5_boolean shortest,
                     char *buffer, size_t buflen);

/**
 * Convert a salt type to a string.
 *
 * @param [in]  salttype        Salttype to convert
 * @param [out] buffer          Buffer to receive the converted string
 * @param [in]  buflen          Storage available in @a buffer
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_salttype_to_string(krb5_int32 salttype, char *buffer, size_t buflen);

/**
 * Convert a checksum type to a string.
 *
 * @param [in]  cksumtype       Checksum type
 * @param [out] buffer          Buffer to hold converted checksum type
 * @param [in]  buflen          Storage available in @a buffer
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_cksumtype_to_string(krb5_cksumtype cksumtype, char *buffer, size_t buflen);

/**
 * Convert a timestamp to a string.
 *
 * @param [in]  timestamp       Timestamp to convert
 * @param [out] buffer          Buffer to hold converted timestamp
 * @param [in]  buflen          Storage available in @a buffer
 *
 * The string is returned in the locale's appropriate date and time
 * representation.
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_timestamp_to_string(krb5_timestamp timestamp, char *buffer, size_t buflen);

/**
 * Convert a timestamp to a string, with optional output padding
 *
 * @param [in]  timestamp       Timestamp to convert
 * @param [out] buffer          Buffer to hold the converted timestamp
 * @param [in]  buflen          Length of buffer
 * @param [in]  pad             Optional value to pad @a buffer if converted
 *                              timestamp does not fill it
 *
 * If @a pad is not NULL, @a buffer is padded out to @a buflen - 1 characters
 * with the value of *@a pad.
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_timestamp_to_sfstring(krb5_timestamp timestamp, char *buffer,
                           size_t buflen, char *pad);

/**
 * Convert a relative time value to a string.
 *
 * @param [in]  deltat          Relative time value to convert
 * @param [out] buffer          Buffer to hold time string
 * @param [in]  buflen          Storage available in @a buffer
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_deltat_to_string(krb5_deltat deltat, char *buffer, size_t buflen);

/* The name of the Kerberos ticket granting service... and its size */
#define KRB5_TGS_NAME           "krbtgt"
#define KRB5_TGS_NAME_SIZE      6

/* flags for recvauth */
#define KRB5_RECVAUTH_SKIP_VERSION      0x0001
#define KRB5_RECVAUTH_BADAUTHVERS       0x0002
/* initial ticket api functions */

/** Text for prompt used in prompter callback function. */
typedef struct _krb5_prompt {
    char *prompt;      /**< The prompt to show to the user */
    int hidden;        /**< Boolean; informative prompt or hidden (e.g. PIN) */
    krb5_data *reply;  /**< Must be allocated before call to  prompt routine */
} krb5_prompt;

/** Pointer to a prompter callback function. */
typedef krb5_error_code
(KRB5_CALLCONV *krb5_prompter_fct)(krb5_context context, void *data,
                                   const char *name, const char *banner,
                                   int num_prompts, krb5_prompt prompts[]);

/**
 * Prompt user for password.
 *
 * @param [in] context          Library context
 * @param      data             Unused (callback argument)
 * @param [in] name             Name to output during prompt
 * @param [in] banner           Banner to output during prompt
 * @param [in] num_prompts      Number of prompts in @a prompts
 * @param [in] prompts          Array of prompts and replies
 *
 * This function is intended to be used as a prompter callback for
 * krb5_get_init_creds_password() or krb5_init_creds_init().
 *
 * Writes @a name and @a banner to stdout, each followed by a newline, then
 * writes each prompt field in the @a prompts array, followed by ": ", and sets
 * the reply field of the entry to a line of input read from stdin.  If the
 * hidden flag is set for a prompt, then terminal echoing is turned off when
 * input is read.
 *
 * @retval
 *  0   Success
 * @return
 * Kerberos error codes
 *
 */
krb5_error_code KRB5_CALLCONV
krb5_prompter_posix(krb5_context context, void *data, const char *name,
                    const char *banner, int num_prompts,
                    krb5_prompt prompts[]);

/**
 * Long-term password responder question
 *
 * This question is asked when the long-term password is needed. It has no
 * challenge and the response is simply the password string.
 *
 * @version New in 1.11
 */
#define KRB5_RESPONDER_QUESTION_PASSWORD "password"

/**
 * OTP responder question
 *
 * The OTP responder question is asked when the KDC indicates that an OTP
 * value is required in order to complete the authentication.  The JSON format
 * of the challenge is:
 *
 *     {
 *       "service": <string (optional)>,
 *       "tokenInfo": [
 *         {
 *           "flags":     <number>,
 *           "vendor":    <string (optional)>,
 *           "challenge": <string (optional)>,
 *           "length":    <number (optional)>,
 *           "format":    <number (optional)>,
 *           "tokenID":   <string (optional)>,
 *           "algID":     <string (optional)>,
 *         },
 *         ...
 *       ]
 *     }
 *
 * The answer to the question MUST be JSON formatted:
 *
 *     {
 *       "tokeninfo": <number>,
 *       "value":     <string (optional)>,
 *       "pin":       <string (optional)>,
 *     }
 *
 * For more detail, please see RFC 6560.
 *
 * @version New in 1.11
 */
#define KRB5_RESPONDER_QUESTION_OTP "otp"

/**
 * These format constants identify the format of the token value.
 */
#define KRB5_RESPONDER_OTP_FORMAT_DECIMAL 0
#define KRB5_RESPONDER_OTP_FORMAT_HEXADECIMAL 1
#define KRB5_RESPONDER_OTP_FORMAT_ALPHANUMERIC 2

/**
 * This flag indicates that the token value MUST be collected.
 */
#define KRB5_RESPONDER_OTP_FLAGS_COLLECT_TOKEN 0x0001

/**
 * This flag indicates that the PIN value MUST be collected.
 */
#define KRB5_RESPONDER_OTP_FLAGS_COLLECT_PIN   0x0002

/**
 * This flag indicates that the token is now in re-synchronization mode with
 * the server.  The user is expected to reply with the next code displayed on
 * the token.
 */
#define KRB5_RESPONDER_OTP_FLAGS_NEXTOTP       0x0004

/**
 * This flag indicates that the PIN MUST be returned as a separate item. This
 * flag only takes effect if KRB5_RESPONDER_OTP_FLAGS_COLLECT_PIN is set. If
 * this flag is not set, the responder may either concatenate PIN + token value
 * and store it as "value" in the answer or it may return them separately. If
 * they are returned separately, they will be concatenated internally.
 */
#define KRB5_RESPONDER_OTP_FLAGS_SEPARATE_PIN  0x0008

/**
 * PKINIT responder question
 *
 * The PKINIT responder question is asked when the client needs a password
 * that's being used to protect key information, and is formatted as a JSON
 * object.  A specific identity's flags value, if not zero, is the bitwise-OR
 * of one or more of the KRB5_RESPONDER_PKINIT_FLAGS_TOKEN_* flags defined
 * below, and possibly other flags to be added later.  Any resemblance to
 * similarly-named CKF_* values in the PKCS#11 API should not be depended on.
 *
 *     {
 *         identity <string> : flags <number>,
 *         ...
 *     }
 *
 * The answer to the question MUST be JSON formatted:
 *
 *     {
 *         identity <string> : password <string>,
 *         ...
 *     }
 *
 * @version New in 1.12
 */
#define KRB5_RESPONDER_QUESTION_PKINIT "pkinit"

/**
 * This flag indicates that an incorrect PIN was supplied at least once since
 * the last time the correct PIN was supplied.
 */
#define KRB5_RESPONDER_PKINIT_FLAGS_TOKEN_USER_PIN_COUNT_LOW       (1 << 0)

/**
 * This flag indicates that supplying an incorrect PIN will cause the token to
 * lock itself.
 */
#define KRB5_RESPONDER_PKINIT_FLAGS_TOKEN_USER_PIN_FINAL_TRY       (1 << 1)

/**
 * This flag indicates that the user PIN is locked, and you can't log in to the
 * token with it.
 */
#define KRB5_RESPONDER_PKINIT_FLAGS_TOKEN_USER_PIN_LOCKED          (1 << 2)

/**
 * A container for a set of preauthentication questions and answers
 *
 * A responder context is supplied by the krb5 authentication system to a @ref
 * krb5_responder_fn callback.  It contains a list of questions and can receive
 * answers.  Questions contained in a responder context can be listed using
 * krb5_responder_list_questions(), retrieved using
 * krb5_responder_get_challenge(), or answered using
 * krb5_responder_set_answer().  The form of a question's challenge and
 * answer depend on the question name.
 *
 * @version New in 1.11
 */
typedef struct krb5_responder_context_st *krb5_responder_context;

/**
 * List the question names contained in the responder context.
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 *
 * Return a pointer to a null-terminated list of question names which are
 * present in @a rctx.  The pointer is an alias, valid only as long as the
 * lifetime of @a rctx, and should not be modified or freed by the caller.  A
 * question's challenge can be retrieved using krb5_responder_get_challenge()
 * and answered using krb5_responder_set_answer().
 *
 * @version New in 1.11
 */
const char * const * KRB5_CALLCONV
krb5_responder_list_questions(krb5_context ctx, krb5_responder_context rctx);

/**
 * Retrieve the challenge data for a given question in the responder context.
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 * @param [in] question         Question name
 *
 * Return a pointer to a C string containing the challenge for @a question
 * within @a rctx, or NULL if the question is not present in @a rctx.  The
 * structure of the question depends on the question name, but will always be
 * printable UTF-8 text.  The returned pointer is an alias, valid only as long
 * as the lifetime of @a rctx, and should not be modified or freed by the
 * caller.
 *
 * @version New in 1.11
 */
const char * KRB5_CALLCONV
krb5_responder_get_challenge(krb5_context ctx, krb5_responder_context rctx,
                             const char *question);

/**
 * Answer a named question in the responder context.
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 * @param [in] question         Question name
 * @param [in] answer           The string to set (MUST be printable UTF-8)
 *
 * This function supplies an answer to @a question within @a rctx.  The
 * appropriate form of the answer depends on the question name.
 *
 * @retval EINVAL @a question is not present within @a rctx
 *
 * @version New in 1.11
 */
krb5_error_code KRB5_CALLCONV
krb5_responder_set_answer(krb5_context ctx, krb5_responder_context rctx,
                          const char *question, const char *answer);

/**
 * Responder function for an initial credential exchange.
 *
 * @param [in] ctx              Library context
 * @param [in] data             Callback data
 * @param [in] rctx             Responder context
 *
 * A responder function is like a prompter function, but is used for handling
 * questions and answers as potentially complex data types.  Client
 * preauthentication modules will insert a set of named "questions" into
 * the responder context.  Each question may optionally contain a challenge.
 * This challenge is printable UTF-8, but may be an encoded value.  The
 * precise encoding and contents of the challenge are specific to the question
 * asked.  When the responder is called, it should answer all the questions it
 * understands.  Like the challenge, the answer MUST be printable UTF-8, but
 * may contain structured/encoded data formatted to the expected answer format
 * of the question.
 *
 * If a required question is unanswered, the prompter may be called.
 */
typedef krb5_error_code
(KRB5_CALLCONV *krb5_responder_fn)(krb5_context ctx, void *data,
                                   krb5_responder_context rctx);

typedef struct _krb5_responder_otp_tokeninfo {
    krb5_flags flags;
    krb5_int32 format; /* -1 when not specified. */
    krb5_int32 length; /* -1 when not specified. */
    char *vendor;
    char *challenge;
    char *token_id;
    char *alg_id;
} krb5_responder_otp_tokeninfo;

typedef struct _krb5_responder_otp_challenge {
    char *service;
    krb5_responder_otp_tokeninfo **tokeninfo;
} krb5_responder_otp_challenge;

/**
 * Decode the KRB5_RESPONDER_QUESTION_OTP to a C struct.
 *
 * A convenience function which parses the KRB5_RESPONDER_QUESTION_OTP
 * question challenge data, making it available in native C.  The main feature
 * of this function is the ability to interact with OTP tokens without parsing
 * the JSON.
 *
 * The returned value must be passed to krb5_responder_otp_challenge_free() to
 * be freed.
 *
 * @param [in]  ctx             Library context
 * @param [in]  rctx            Responder context
 * @param [out] chl             Challenge structure
 *
 * @version New in 1.11
 */
krb5_error_code KRB5_CALLCONV
krb5_responder_otp_get_challenge(krb5_context ctx,
                                 krb5_responder_context rctx,
                                 krb5_responder_otp_challenge **chl);

/**
 * Answer the KRB5_RESPONDER_QUESTION_OTP question.
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 * @param [in] ti               The index of the tokeninfo selected
 * @param [in] value            The value to set, or NULL for none
 * @param [in] pin              The pin to set, or NULL for none
 *
 * @version New in 1.11
 */
krb5_error_code KRB5_CALLCONV
krb5_responder_otp_set_answer(krb5_context ctx, krb5_responder_context rctx,
                              size_t ti, const char *value, const char *pin);

/**
 * Free the value returned by krb5_responder_otp_get_challenge().
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 * @param [in] chl              The challenge to free
 *
 * @version New in 1.11
 */
void KRB5_CALLCONV
krb5_responder_otp_challenge_free(krb5_context ctx,
                                  krb5_responder_context rctx,
                                  krb5_responder_otp_challenge *chl);

typedef struct _krb5_responder_pkinit_identity {
    char *identity;
    krb5_int32 token_flags;     /* 0 when not specified or not applicable. */
} krb5_responder_pkinit_identity;

typedef struct _krb5_responder_pkinit_challenge {
    krb5_responder_pkinit_identity **identities;
} krb5_responder_pkinit_challenge;

/**
 * Decode the KRB5_RESPONDER_QUESTION_PKINIT to a C struct.
 *
 * A convenience function which parses the KRB5_RESPONDER_QUESTION_PKINIT
 * question challenge data, making it available in native C.  The main feature
 * of this function is the ability to read the challenge without parsing
 * the JSON.
 *
 * The returned value must be passed to krb5_responder_pkinit_challenge_free()
 * to be freed.
 *
 * @param [in]  ctx             Library context
 * @param [in]  rctx            Responder context
 * @param [out] chl_out         Challenge structure
 *
 * @version New in 1.12
 */
krb5_error_code KRB5_CALLCONV
krb5_responder_pkinit_get_challenge(krb5_context ctx,
                                    krb5_responder_context rctx,
                                    krb5_responder_pkinit_challenge **chl_out);

/**
 * Answer the KRB5_RESPONDER_QUESTION_PKINIT question for one identity.
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 * @param [in] identity         The identity for which a PIN is being supplied
 * @param [in] pin              The provided PIN, or NULL for none
 *
 * @version New in 1.12
 */
krb5_error_code KRB5_CALLCONV
krb5_responder_pkinit_set_answer(krb5_context ctx, krb5_responder_context rctx,
                                 const char *identity, const char *pin);

/**
 * Free the value returned by krb5_responder_pkinit_get_challenge().
 *
 * @param [in] ctx              Library context
 * @param [in] rctx             Responder context
 * @param [in] chl              The challenge to free
 *
 * @version New in 1.12
 */
void KRB5_CALLCONV
krb5_responder_pkinit_challenge_free(krb5_context ctx,
                                     krb5_responder_context rctx,
                                     krb5_responder_pkinit_challenge *chl);

/** Store options for @c _krb5_get_init_creds */
typedef struct _krb5_get_init_creds_opt {
    krb5_flags flags;
    krb5_deltat tkt_life;
    krb5_deltat renew_life;
    int forwardable;
    int proxiable;
    krb5_enctype *etype_list;
    int etype_list_length;
    krb5_address **address_list;
    krb5_preauthtype *preauth_list;
    int preauth_list_length;
    krb5_data *salt;
} krb5_get_init_creds_opt;

#define KRB5_GET_INIT_CREDS_OPT_TKT_LIFE        0x0001
#define KRB5_GET_INIT_CREDS_OPT_RENEW_LIFE      0x0002
#define KRB5_GET_INIT_CREDS_OPT_FORWARDABLE     0x0004
#define KRB5_GET_INIT_CREDS_OPT_PROXIABLE       0x0008
#define KRB5_GET_INIT_CREDS_OPT_ETYPE_LIST      0x0010
#define KRB5_GET_INIT_CREDS_OPT_ADDRESS_LIST    0x0020
#define KRB5_GET_INIT_CREDS_OPT_PREAUTH_LIST    0x0040
#define KRB5_GET_INIT_CREDS_OPT_SALT            0x0080
#define KRB5_GET_INIT_CREDS_OPT_CHG_PWD_PRMPT   0x0100
#define KRB5_GET_INIT_CREDS_OPT_CANONICALIZE    0x0200
#define KRB5_GET_INIT_CREDS_OPT_ANONYMOUS       0x0400

/**
 * Allocate a new initial credential options structure.
 *
 * @param [in]  context         Library context
 * @param [out] opt             New options structure
 *
 * This function is the preferred way to create an options structure for
 * getting initial credentials, and is required to make use of certain options.
 * Use krb5_get_init_creds_opt_free() to free @a opt when it is no longer
 * needed.
 *
 * @retval 0 - Success; Kerberos errors otherwise.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_alloc(krb5_context context,
                              krb5_get_init_creds_opt **opt);

/**
 * Free initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options structure to free
 *
 * @sa krb5_get_init_creds_opt_alloc()
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_free(krb5_context context,
                             krb5_get_init_creds_opt *opt);

/** @deprecated Use krb5_get_init_creds_opt_alloc() instead. */
void KRB5_CALLCONV
krb5_get_init_creds_opt_init(krb5_get_init_creds_opt *opt);

/**
 * Set the ticket lifetime in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] tkt_life         Ticket lifetime
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_tkt_life(krb5_get_init_creds_opt *opt,
                                     krb5_deltat tkt_life);

/**
 * Set the ticket renewal lifetime in initial credential options.
 *
 * @param [in] opt              Pointer to @a options field
 * @param [in] renew_life       Ticket renewal lifetime
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_renew_life(krb5_get_init_creds_opt *opt,
                                       krb5_deltat renew_life);

/**
 * Set or unset the forwardable flag in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] forwardable      Whether credentials should be forwardable
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_forwardable(krb5_get_init_creds_opt *opt,
                                        int forwardable);

/**
 * Set or unset the proxiable flag in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] proxiable        Whether credentials should be proxiable
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_proxiable(krb5_get_init_creds_opt *opt,
                                      int proxiable);

/**
 * Set or unset the canonicalize flag in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] canonicalize     Whether to canonicalize client principal
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_canonicalize(krb5_get_init_creds_opt *opt,
                                         int canonicalize);

/**
 * Set or unset the anonymous flag in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] anonymous        Whether to make an anonymous request
 *
 * This function may be used to request anonymous credentials from the KDC by
 * setting @a anonymous to non-zero.  Note that anonymous credentials are only
 * a request; clients must verify that credentials are anonymous if that is a
 * requirement.
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_anonymous(krb5_get_init_creds_opt *opt,
                                      int anonymous);

/**
 * Set allowable encryption types in initial credential options.
 *
 * @param [in] opt               Options structure
 * @param [in] etype_list        Array of encryption types
 * @param [in] etype_list_length Length of @a etype_list
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_etype_list(krb5_get_init_creds_opt *opt,
                                       krb5_enctype *etype_list,
                                       int etype_list_length);

/**
 * Set address restrictions in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] addresses        Null-terminated array of addresses
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_address_list(krb5_get_init_creds_opt *opt,
                                         krb5_address **addresses);

/**
 * Set preauthentication types in initial credential options.
 *
 * @param [in] opt                 Options structure
 * @param [in] preauth_list        Array of preauthentication types
 * @param [in] preauth_list_length Length of @a preauth_list
 *
 * This function can be used to perform optimistic preauthentication when
 * getting initial credentials, in combination with
 * krb5_get_init_creds_opt_set_salt() and krb5_get_init_creds_opt_set_pa().
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_preauth_list(krb5_get_init_creds_opt *opt,
                                         krb5_preauthtype *preauth_list,
                                         int preauth_list_length);

/**
 * Set salt for optimistic preauthentication in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] salt             Salt data
 *
 * When getting initial credentials with a password, a salt string it used to
 * convert the password to a key.  Normally this salt is obtained from the
 * first KDC reply, but when performing optimistic preauthentication, the
 * client may need to supply the salt string with this function.
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_salt(krb5_get_init_creds_opt *opt,
                                 krb5_data *salt);

/**
 * Set or unset change-password-prompt flag in initial credential options.
 *
 * @param [in] opt              Options structure
 * @param [in] prompt           Whether to prompt to change password
 *
 * This flag is on by default.  It controls whether
 * krb5_get_init_creds_password() will react to an expired-password error by
 * prompting for a new password and attempting to change the old one.
 */
void KRB5_CALLCONV
krb5_get_init_creds_opt_set_change_password_prompt(krb5_get_init_creds_opt *opt,
                                                   int prompt);

/** Generic preauth option attribute/value pairs */
typedef struct _krb5_gic_opt_pa_data {
    char *attr;
    char *value;
} krb5_gic_opt_pa_data;

/**
 * Supply options for preauthentication in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options structure
 * @param [in] attr             Preauthentication option name
 * @param [in] value            Preauthentication option value
 *
 * This function allows the caller to supply options for preauthentication.
 * The values of @a attr and @a value are supplied to each preauthentication
 * module available within @a context.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_pa(krb5_context context,
                               krb5_get_init_creds_opt *opt, const char *attr,
                               const char *value);

/**
 * Set location of FAST armor ccache in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options
 * @param [in] fast_ccache_name Credential cache name
 *
 * Sets the location of a credential cache containing an armor ticket to
 * protect an initial credential exchange using the FAST protocol extension.
 *
 * In version 1.7, setting an armor ccache requires that FAST be used for the
 * exchange.  In version 1.8 or later, setting the armor ccache causes FAST to
 * be used if the KDC supports it; krb5_get_init_creds_opt_set_fast_flags()
 * must be used to require that FAST be used.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_fast_ccache_name(krb5_context context,
                                             krb5_get_init_creds_opt *opt,
                                             const char *fast_ccache_name);

/**
 * Set FAST armor cache in initial credential options.
 *
 * @param [in] context           Library context
 * @param [in] opt               Options
 * @param [in] ccache            Credential cache handle
 *
 * This function is similar to krb5_get_init_creds_opt_set_fast_ccache_name(),
 * but uses a credential cache handle instead of a name.
 *
 * @version New in 1.9
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_fast_ccache(krb5_context context,
                                        krb5_get_init_creds_opt *opt,
                                        krb5_ccache ccache);

/**
 * Set an input credential cache in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options
 * @param [in] ccache           Credential cache handle
 *
 * If an input credential cache is set, then the krb5_get_init_creds family of
 * APIs will read settings from it.  Setting an input ccache is desirable when
 * the application wishes to perform authentication in the same way (using the
 * same preauthentication mechanisms, and making the same non-security-
 * sensitive choices) as the previous authentication attempt, which stored
 * information in the passed-in ccache.
 *
 * @version New in 1.11
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_in_ccache(krb5_context context,
                                      krb5_get_init_creds_opt *opt,
                                      krb5_ccache ccache);

/**
 * Set an output credential cache in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options
 * @param [in] ccache           Credential cache handle
 *
 * If an output credential cache is set, then the krb5_get_init_creds family of
 * APIs will write credentials to it.  Setting an output ccache is desirable
 * both because it simplifies calling code and because it permits the
 * krb5_get_init_creds APIs to write out configuration information about the
 * realm to the ccache.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_out_ccache(krb5_context context,
                                       krb5_get_init_creds_opt *opt,
                                       krb5_ccache ccache);

/**
 * @brief Ask the KDC to include or not include a PAC in the ticket
 *
 * @param [in] context          Library context
 * @param [in] opt              Options structure
 * @param [in] req_pac          Whether to request a PAC or not
 *
 * If this option is set, the AS request will include a PAC-REQUEST pa-data
 * item explicitly asking the KDC to either include or not include a privilege
 * attribute certificate in the ticket authorization data.  By default, no
 * request is made; typically the KDC will default to including a PAC if it
 * supports them.
 *
 * @version New in 1.15
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_pac_request(krb5_context context,
                                        krb5_get_init_creds_opt *opt,
                                        krb5_boolean req_pac);

/**
 * Set FAST flags in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options
 * @param [in] flags            FAST flags
 *
 * The following flag values are valid:
 * @li #KRB5_FAST_REQUIRED - Require FAST to be used
 *
 * @retval
 * 0 - Success; Kerberos errors otherwise.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_fast_flags(krb5_context context,
                                       krb5_get_init_creds_opt *opt,
                                       krb5_flags flags);

/**
 * Retrieve FAST flags from initial credential options.
 *
 * @param [in]  context         Library context
 * @param [in]  opt             Options
 * @param [out] out_flags       FAST flags
 *
 * @retval
 * 0 - Success; Kerberos errors otherwise.
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_get_fast_flags(krb5_context context,
                                       krb5_get_init_creds_opt *opt,
                                       krb5_flags *out_flags);

/* Fast flags*/
#define KRB5_FAST_REQUIRED 0x0001 /**< Require KDC to support FAST*/

typedef void
(KRB5_CALLCONV *krb5_expire_callback_func)(krb5_context context, void *data,
                                           krb5_timestamp password_expiration,
                                           krb5_timestamp account_expiration,
                                           krb5_boolean is_last_req);

/**
 * Set an expiration callback in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options structure
 * @param [in] cb               Callback function
 * @param [in] data             Callback argument
 *
 * Set a callback to receive password and account expiration times.
 *
 * @a cb will be invoked if and only if credentials are successfully acquired.
 * The callback will receive the @a context from the calling function and the
 * @a data argument supplied with this API.  The remaining arguments should be
 * interpreted as follows:
 *
 * If @a is_last_req is true, then the KDC reply contained last-req entries
 * which unambiguously indicated the password expiration, account expiration,
 * or both.  (If either value was not present, the corresponding argument will
 * be 0.)  Furthermore, a non-zero @a password_expiration should be taken as a
 * suggestion from the KDC that a warning be displayed.
 *
 * If @a is_last_req is false, then @a account_expiration will be 0 and @a
 * password_expiration will contain the expiration time of either the password
 * or account, or 0 if no expiration time was indicated in the KDC reply.  The
 * callback should independently decide whether to display a password
 * expiration warning.
 *
 * Note that @a cb may be invoked even if credentials are being acquired for
 * the kadmin/changepw service in order to change the password.  It is the
 * caller's responsibility to avoid displaying a password expiry warning in
 * this case.
 *
 * @warning Setting an expire callback with this API will cause
 * krb5_get_init_creds_password() not to send password expiry warnings to the
 * prompter, as it ordinarily may.
 *
 * @version New in 1.9
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_expire_callback(krb5_context context,
                                            krb5_get_init_creds_opt *opt,
                                            krb5_expire_callback_func cb,
                                            void *data);

/**
 * Set the responder function in initial credential options.
 *
 * @param [in] context          Library context
 * @param [in] opt              Options structure
 * @param [in] responder        Responder function
 * @param [in] data             Responder data argument
 *
 * @version New in 1.11
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_opt_set_responder(krb5_context context,
                                      krb5_get_init_creds_opt *opt,
                                      krb5_responder_fn responder, void *data);

/**
 * Get initial credentials using a password.
 *
 * @param [in]  context         Library context
 * @param [out] creds           New credentials
 * @param [in]  client          Client principal
 * @param [in]  password        Password (or NULL)
 * @param [in]  prompter        Prompter function
 * @param [in]  data            Prompter callback data
 * @param [in]  start_time      Time when ticket becomes valid (0 for now)
 * @param [in]  in_tkt_service  Service name of initial credentials (or NULL)
 * @param [in]  k5_gic_options  Initial credential options
 *
 * This function requests KDC for an initial credentials for @a client using @a
 * password.  If @a password is NULL, a password will be prompted for using @a
 * prompter if necessary.  If @a in_tkt_service is specified, it is parsed as a
 * principal name (with the realm ignored) and used as the service principal
 * for the request; otherwise the ticket-granting service is used.
 *
 * @sa krb5_verify_init_creds()
 *
 * @retval
 *  0    Success
 * @retval
 *  EINVAL Invalid argument
 * @retval
 *  KRB5_KDC_UNREACH Cannot contact any KDC for requested realm
 * @retval
 *  KRB5_PREAUTH_FAILED Generic Pre-athentication failure
 * @retval
 *  KRB5_LIBOS_PWDINTR Password read interrupted
 * @retval
 *  KRB5_REALM_CANT_RESOLVE Cannot resolve network address for KDC in requested realm
 * @retval
 *  KRB5KDC_ERR_KEY_EXP Password has expired
 * @retval
 *  KRB5_LIBOS_BADPWDMATCH Password mismatch
 * @retval
 *  KRB5_CHPW_PWDNULL New password cannot be zero length
 * @retval
 *  KRB5_CHPW_FAIL Password change failed
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_password(krb5_context context, krb5_creds *creds,
                             krb5_principal client, const char *password,
                             krb5_prompter_fct prompter, void *data,
                             krb5_deltat start_time,
                             const char *in_tkt_service,
                             krb5_get_init_creds_opt *k5_gic_options);

/**
 * Retrieve enctype, salt and s2kparams from KDC
 *
 * @param [in]  context         Library context
 * @param [in]  principal       Principal whose information is requested
 * @param [in]  opt             Initial credential options
 * @param [out] enctype_out     The enctype chosen by KDC
 * @param [out] salt_out        Salt returned from KDC
 * @param [out] s2kparams_out   String-to-key parameters returned from KDC
 *
 * Send an initial ticket request for @a principal and extract the encryption
 * type, salt type, and string-to-key parameters from the KDC response.  If the
 * KDC provides no etype-info, set @a enctype_out to @c ENCTYPE_NULL and set @a
 * salt_out and @a s2kparams_out to empty.  If the KDC etype-info provides no
 * salt, compute the default salt and place it in @a salt_out.  If the KDC
 * etype-info provides no string-to-key parameters, set @a s2kparams_out to
 * empty.
 *
 * @a opt may be used to specify options which affect the initial request, such
 * as request encryption types or a FAST armor cache (see
 * krb5_get_init_creds_opt_set_etype_list() and
 * krb5_get_init_creds_opt_set_fast_ccache_name()).
 *
 * Use krb5_free_data_contents() to free @a salt_out and @a s2kparams_out when
 * they are no longer needed.
 *
 * @version New in 1.17
 *
 * @retval 0 Success
 * @return A Kerberos error code
 */
krb5_error_code KRB5_CALLCONV
krb5_get_etype_info(krb5_context context, krb5_principal principal,
                    krb5_get_init_creds_opt *opt, krb5_enctype *enctype_out,
                    krb5_data *salt_out, krb5_data *s2kparams_out);

struct _krb5_init_creds_context;
typedef struct _krb5_init_creds_context *krb5_init_creds_context;

#define KRB5_INIT_CREDS_STEP_FLAG_CONTINUE 0x1  /**< More responses needed */

/**
 * Free an initial credentials context.
 *
 * @param [in] context          Library context
 * @param [in] ctx              Initial credentials context
 *
 * @a context must be the same as the one passed to krb5_init_creds_init() for
 * this initial credentials context.
 */
void KRB5_CALLCONV
krb5_init_creds_free(krb5_context context, krb5_init_creds_context ctx);

/**
 * Acquire credentials using an initial credentials context.
 *
 * @param [in] context          Library context
 * @param [in] ctx              Initial credentials context
 *
 * This function synchronously obtains credentials using a context created by
 * krb5_init_creds_init().  On successful return, the credentials can be
 * retrieved with krb5_init_creds_get_creds().
 *
 * @a context must be the same as the one passed to krb5_init_creds_init() for
 * this initial credentials context.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_get(krb5_context context, krb5_init_creds_context ctx);

/**
 * Retrieve acquired credentials from an initial credentials context.
 *
 * @param [in]  context         Library context
 * @param [in]  ctx             Initial credentials context
 * @param [out] creds           Acquired credentials
 *
 * This function copies the acquired initial credentials from @a ctx into @a
 * creds, after the successful completion of krb5_init_creds_get() or
 * krb5_init_creds_step().  Use krb5_free_cred_contents() to free @a creds when
 * it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_get_creds(krb5_context context, krb5_init_creds_context ctx,
                          krb5_creds *creds);

/**
 * Get the last error from KDC from an initial credentials context.
 *
 * @param [in]  context         Library context
 * @param [in]  ctx             Initial credentials context
 * @param [out] error           Error from KDC, or NULL if none was received
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_get_error(krb5_context context, krb5_init_creds_context ctx,
                          krb5_error **error);

/**
 * Create a context for acquiring initial credentials.
 *
 * @param [in]  context         Library context
 * @param [in]  client          Client principal to get initial creds for
 * @param [in]  prompter        Prompter callback
 * @param [in]  data            Prompter callback argument
 * @param [in]  start_time      Time when credentials become valid (0 for now)
 * @param [in]  options         Options structure (NULL for default)
 * @param [out] ctx             New initial credentials context
 *
 * This function creates a new context for acquiring initial credentials.  Use
 * krb5_init_creds_free() to free @a ctx when it is no longer needed.
 *
 * Any subsequent calls to krb5_init_creds_step(), krb5_init_creds_get(), or
 * krb5_init_creds_free() for this initial credentials context must use the
 * same @a context argument as the one passed to this function.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_init(krb5_context context, krb5_principal client,
                     krb5_prompter_fct prompter, void *data,
                     krb5_deltat start_time, krb5_get_init_creds_opt *options,
                     krb5_init_creds_context *ctx);

/**
 * Specify a keytab to use for acquiring initial credentials.
 *
 * @param [in] context          Library context
 * @param [in] ctx              Initial credentials context
 * @param [in] keytab           Key table handle
 *
 * This function supplies a keytab containing the client key for an initial
 * credentials request.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_set_keytab(krb5_context context, krb5_init_creds_context ctx,
                           krb5_keytab keytab);

/**
 * Get the next KDC request for acquiring initial credentials.
 *
 * @param [in]  context         Library context
 * @param [in]  ctx             Initial credentials context
 * @param [in]  in              KDC response (empty on the first call)
 * @param [out] out             Next KDC request
 * @param [out] realm           Realm for next KDC request
 * @param [out] flags           Output flags
 *
 * This function constructs the next KDC request in an initial credential
 * exchange, allowing the caller to control the transport of KDC requests and
 * replies.  On the first call, @a in should be set to an empty buffer; on
 * subsequent calls, it should be set to the KDC's reply to the previous
 * request.
 *
 * If more requests are needed, @a flags will be set to
 * #KRB5_INIT_CREDS_STEP_FLAG_CONTINUE and the next request will be placed in
 * @a out.  If no more requests are needed, @a flags will not contain
 * #KRB5_INIT_CREDS_STEP_FLAG_CONTINUE and @a out will be empty.
 *
 * If this function returns @c KRB5KRB_ERR_RESPONSE_TOO_BIG, the caller should
 * transmit the next request using TCP rather than UDP.  If this function
 * returns any other error, the initial credential exchange has failed.
 *
 * @a context must be the same as the one passed to krb5_init_creds_init() for
 * this initial credentials context.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_step(krb5_context context, krb5_init_creds_context ctx,
                     krb5_data *in, krb5_data *out, krb5_data *realm,
                     unsigned int *flags);

/**
 * Set a password for acquiring initial credentials.
 *
 * @param [in] context          Library context
 * @param [in] ctx              Initial credentials context
 * @param [in] password         Password
 *
 * This function supplies a password to be used to construct the client key for
 * an initial credentials request.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_set_password(krb5_context context, krb5_init_creds_context ctx,
                             const char *password);

/**
 * Specify a service principal for acquiring initial credentials.
 *
 * @param [in] context          Library context
 * @param [in] ctx              Initial credentials context
 * @param [in] service          Service principal string
 *
 * This function supplies a service principal string to acquire initial
 * credentials for instead of the default krbtgt service.  @a service is parsed
 * as a principal name; any realm part is ignored.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_set_service(krb5_context context, krb5_init_creds_context ctx,
                            const char *service);

/**
 * Retrieve ticket times from an initial credentials context.
 *
 * @param [in]  context         Library context
 * @param [in]  ctx             Initial credentials context
 * @param [out] times           Ticket times for acquired credentials
 *
 * The initial credentials context must have completed obtaining credentials
 * via either krb5_init_creds_get() or krb5_init_creds_step().
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_init_creds_get_times(krb5_context context, krb5_init_creds_context ctx,
                          krb5_ticket_times *times);

struct _krb5_tkt_creds_context;
typedef struct _krb5_tkt_creds_context *krb5_tkt_creds_context;

/**
 * Create a context to get credentials from a KDC's Ticket Granting Service.
 *
 * @param[in]  context          Library context
 * @param[in]  ccache           Credential cache handle
 * @param[in]  creds            Input credentials
 * @param[in]  options          @ref KRB5_GC options for this request.
 * @param[out] ctx              New TGS request context
 *
 * This function prepares to obtain credentials matching @a creds, either by
 * retrieving them from @a ccache or by making requests to ticket-granting
 * services beginning with a ticket-granting ticket for the client principal's
 * realm.
 *
 * The resulting TGS acquisition context can be used asynchronously with
 * krb5_tkt_creds_step() or synchronously with krb5_tkt_creds_get().  See also
 * krb5_get_credentials() for synchronous use.
 *
 * Use krb5_tkt_creds_free() to free @a ctx when it is no longer needed.
 *
 * @version New in 1.9
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_tkt_creds_init(krb5_context context, krb5_ccache ccache,
                    krb5_creds *creds, krb5_flags options,
                    krb5_tkt_creds_context *ctx);

/**
 * Synchronously obtain credentials using a TGS request context.
 *
 * @param[in] context           Library context
 * @param[in] ctx               TGS request context
 *
 * This function synchronously obtains credentials using a context created by
 * krb5_tkt_creds_init().  On successful return, the credentials can be
 * retrieved with krb5_tkt_creds_get_creds().
 *
 * @version New in 1.9
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_tkt_creds_get(krb5_context context, krb5_tkt_creds_context ctx);

/**
 * Retrieve acquired credentials from a TGS request context.
 *
 * @param[in]  context          Library context
 * @param[in]  ctx              TGS request context
 * @param[out] creds            Acquired credentials
 *
 * This function copies the acquired initial credentials from @a ctx into @a
 * creds, after the successful completion of krb5_tkt_creds_get() or
 * krb5_tkt_creds_step().  Use krb5_free_cred_contents() to free @a creds when
 * it is no longer needed.
 *
 * @version New in 1.9
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_tkt_creds_get_creds(krb5_context context, krb5_tkt_creds_context ctx,
                         krb5_creds *creds);

/**
 * Free a TGS request context.
 *
 * @param[in]  context  Library context
 * @param[in]  ctx      TGS request context
 *
 * @version New in 1.9
 */
void KRB5_CALLCONV
krb5_tkt_creds_free(krb5_context context, krb5_tkt_creds_context ctx);

#define KRB5_TKT_CREDS_STEP_FLAG_CONTINUE 0x1  /**< More responses needed */

/**
 * Get the next KDC request in a TGS exchange.
 *
 * @param[in]  context          Library context
 * @param[in]  ctx              TGS request context
 * @param[in]  in               KDC response (empty on the first call)
 * @param[out] out              Next KDC request
 * @param[out] realm            Realm for next KDC request
 * @param[out] flags            Output flags
 *
 * This function constructs the next KDC request for a TGS exchange, allowing
 * the caller to control the transport of KDC requests and replies.  On the
 * first call, @a in should be set to an empty buffer; on subsequent calls, it
 * should be set to the KDC's reply to the previous request.
 *
 * If more requests are needed, @a flags will be set to
 * #KRB5_TKT_CREDS_STEP_FLAG_CONTINUE and the next request will be placed in @a
 * out.  If no more requests are needed, @a flags will not contain
 * #KRB5_TKT_CREDS_STEP_FLAG_CONTINUE and @a out will be empty.
 *
 * If this function returns @c KRB5KRB_ERR_RESPONSE_TOO_BIG, the caller should
 * transmit the next request using TCP rather than UDP.  If this function
 * returns any other error, the TGS exchange has failed.
 *
 * @version New in 1.9
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_tkt_creds_step(krb5_context context, krb5_tkt_creds_context ctx,
                    krb5_data *in, krb5_data *out, krb5_data *realm,
                    unsigned int *flags);

/**
 * Retrieve ticket times from a TGS request context.
 *
 * @param[in]  context          Library context
 * @param[in]  ctx              TGS request context
 * @param[out] times            Ticket times for acquired credentials
 *
 * The TGS request context must have completed obtaining credentials via either
 * krb5_tkt_creds_get() or krb5_tkt_creds_step().
 *
 * @version New in 1.9
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_tkt_creds_get_times(krb5_context context, krb5_tkt_creds_context ctx,
                         krb5_ticket_times *times);

/**
 * Get initial credentials using a key table.
 *
 * @param [in]  context         Library context
 * @param [out] creds           New credentials
 * @param [in]  client          Client principal
 * @param [in]  arg_keytab      Key table handle
 * @param [in]  start_time      Time when ticket becomes valid (0 for now)
 * @param [in]  in_tkt_service  Service name of initial credentials (or NULL)
 * @param [in]  k5_gic_options  Initial credential options
 *
 * This function requests KDC for an initial credentials for @a client using a
 * client key stored in @a arg_keytab.  If @a in_tkt_service is specified, it
 * is parsed as a principal name (with the realm ignored) and used as the
 * service principal for the request; otherwise the ticket-granting service is
 * used.
 *
 * @sa krb5_verify_init_creds()
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_init_creds_keytab(krb5_context context, krb5_creds *creds,
                           krb5_principal client, krb5_keytab arg_keytab,
                           krb5_deltat start_time, const char *in_tkt_service,
                           krb5_get_init_creds_opt *k5_gic_options);

typedef struct _krb5_verify_init_creds_opt {
    krb5_flags flags;
    int ap_req_nofail; /**< boolean */
} krb5_verify_init_creds_opt;

#define KRB5_VERIFY_INIT_CREDS_OPT_AP_REQ_NOFAIL        0x0001

/**
 * Initialize a credential verification options structure.
 *
 * @param [in] k5_vic_options   Verification options structure
 */
void KRB5_CALLCONV
krb5_verify_init_creds_opt_init(krb5_verify_init_creds_opt *k5_vic_options);

/**
 * Set whether credential verification is required.
 *
 * @param [in] k5_vic_options   Verification options structure
 * @param [in] ap_req_nofail    Whether to require successful verification
 *
 * This function determines how krb5_verify_init_creds() behaves if no keytab
 * information is available.  If @a ap_req_nofail is @c FALSE, verification
 * will be skipped in this case and krb5_verify_init_creds() will return
 * successfully.  If @a ap_req_nofail is @c TRUE, krb5_verify_init_creds() will
 * not return successfully unless verification can be performed.
 *
 * If this function is not used, the behavior of krb5_verify_init_creds() is
 * determined through configuration.
 */
void KRB5_CALLCONV
krb5_verify_init_creds_opt_set_ap_req_nofail(krb5_verify_init_creds_opt * k5_vic_options,
                                             int ap_req_nofail);

/**
 * Verify initial credentials against a keytab.
 *
 * @param [in] context          Library context
 * @param [in] creds            Initial credentials to be verified
 * @param [in] server           Server principal (or NULL)
 * @param [in] keytab           Key table (NULL to use default keytab)
 * @param [in] ccache           Credential cache for fetched creds (or NULL)
 * @param [in] options          Verification options (NULL for default options)
 *
 * This function attempts to verify that @a creds were obtained from a KDC with
 * knowledge of a key in @a keytab, or the default keytab if @a keytab is NULL.
 * If @a server is provided, the highest-kvno key entry for that principal name
 * is used to verify the credentials; otherwise, all unique "host" service
 * principals in the keytab are tried.
 *
 * If the specified keytab does not exist, or is empty, or cannot be read, or
 * does not contain an entry for @a server, then credential verification may be
 * skipped unless configuration demands that it succeed.  The caller can
 * control this behavior by providing a verification options structure; see
 * krb5_verify_init_creds_opt_init() and
 * krb5_verify_init_creds_opt_set_ap_req_nofail().
 *
 * If @a ccache is NULL, any additional credentials fetched during the
 * verification process will be destroyed.  If @a ccache points to NULL, a
 * memory ccache will be created for the additional credentials and returned in
 * @a ccache.  If @a ccache points to a valid credential cache handle, the
 * additional credentials will be stored in that cache.
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_verify_init_creds(krb5_context context, krb5_creds *creds,
                       krb5_principal server, krb5_keytab keytab,
                       krb5_ccache *ccache,
                       krb5_verify_init_creds_opt *options);

/**
 * Get validated credentials from the KDC.
 *
 * @param [in]  context         Library context
 * @param [out] creds           Validated credentials
 * @param [in]  client          Client principal name
 * @param [in]  ccache          Credential cache
 * @param [in]  in_tkt_service  Server principal string (or NULL)
 *
 * This function gets a validated credential using a postdated credential from
 * @a ccache.  If @a in_tkt_service is specified, it is parsed (with the realm
 * part ignored) and used as the server principal of the credential;
 * otherwise, the ticket-granting service is used.
 *
 * If successful, the validated credential is placed in @a creds.
 *
 * @sa krb5_get_renewed_creds()
 *
 * @retval
 * 0 Success
 * @retval
 * KRB5_NO_2ND_TKT Request missing second ticket
 * @retval
 * KRB5_NO_TKT_SUPPLIED Request did not supply a ticket
 * @retval
 * KRB5_PRINC_NOMATCH Requested principal and ticket do not match
 * @retval
 * KRB5_KDCREP_MODIFIED KDC reply did not match expectations
 * @retval
 * KRB5_KDCREP_SKEW Clock skew too great in KDC reply
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_validated_creds(krb5_context context, krb5_creds *creds,
                         krb5_principal client, krb5_ccache ccache,
                         const char *in_tkt_service);

/**
 * Get renewed credential from KDC using an existing credential.
 *
 * @param [in]  context         Library context
 * @param [out] creds           Renewed credentials
 * @param [in]  client          Client principal name
 * @param [in]  ccache          Credential cache
 * @param [in]  in_tkt_service  Server principal string (or NULL)
 *
 * This function gets a renewed credential using an existing one from @a
 * ccache.  If @a in_tkt_service is specified, it is parsed (with the realm
 * part ignored) and used as the server principal of the credential; otherwise,
 * the ticket-granting service is used.
 *
 * If successful, the renewed credential is placed in @a creds.
 *
 * @retval
 * 0 Success
 * @return
 * Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_get_renewed_creds(krb5_context context, krb5_creds *creds,
                       krb5_principal client, krb5_ccache ccache,
                       const char *in_tkt_service);

/**
 * Decode an ASN.1-formatted ticket.
 *
 * @param [in]  code            ASN.1-formatted ticket
 * @param [out] rep             Decoded ticket information
 *
 * @retval 0  Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_decode_ticket(const krb5_data *code, krb5_ticket **rep);

/**
 * Retrieve a string value from the appdefaults section of krb5.conf.
 *
 * @param [in]  context         Library context
 * @param [in]  appname         Application name
 * @param [in]  realm           Realm name
 * @param [in]  option          Option to be checked
 * @param [in]  default_value   Default value to return if no match is found
 * @param [out] ret_value       String value of @a option
 *
 * This function gets the application defaults for @a option based on the given
 * @a appname and/or @a realm.
 *
 * @sa krb5_appdefault_boolean()
 */
void KRB5_CALLCONV
krb5_appdefault_string(krb5_context context, const char *appname,
                       const krb5_data *realm, const char *option,
                       const char *default_value, char ** ret_value);

/**
 * Retrieve a boolean value from the appdefaults section of krb5.conf.
 *
 * @param [in]  context         Library context
 * @param [in]  appname         Application name
 * @param [in]  realm           Realm name
 * @param [in]  option          Option to be checked
 * @param [in]  default_value   Default value to return if no match is found
 * @param [out] ret_value       Boolean value of @a option
 *
 * This function gets the application defaults for @a option based on the given
 * @a appname and/or @a realm.
 *
 * @sa krb5_appdefault_string()
 */
void KRB5_CALLCONV
krb5_appdefault_boolean(krb5_context context, const char *appname,
                        const krb5_data *realm, const char *option,
                        int default_value, int *ret_value);

/*
 * Prompter enhancements
 */
/** Prompt for password */
#define KRB5_PROMPT_TYPE_PASSWORD            0x1
/** Prompt for new password (during password change) */
#define KRB5_PROMPT_TYPE_NEW_PASSWORD        0x2
/** Prompt for new password again */
#define KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN  0x3
/** Prompt for preauthentication data (such as an OTP value) */
#define KRB5_PROMPT_TYPE_PREAUTH             0x4

typedef krb5_int32 krb5_prompt_type;

/**
 * Get prompt types array from a context.
 *
 * @param [in] context          Library context
 *
 * @return
 * Pointer to an array of prompt types corresponding to the prompter's @a
 * prompts arguments.  Each type has one of the following values:
 *  @li #KRB5_PROMPT_TYPE_PASSWORD
 *  @li #KRB5_PROMPT_TYPE_NEW_PASSWORD
 *  @li #KRB5_PROMPT_TYPE_NEW_PASSWORD_AGAIN
 *  @li #KRB5_PROMPT_TYPE_PREAUTH
 */
krb5_prompt_type* KRB5_CALLCONV
krb5_get_prompt_types(krb5_context context);

/* Error reporting */
/**
 * Set an extended error message for an error code.
 *
 * @param [in] ctx              Library context
 * @param [in] code             Error code
 * @param [in] fmt              Error string for the error code
 * @param [in] ...              printf(3) style parameters
 */
void KRB5_CALLCONV_C
krb5_set_error_message(krb5_context ctx, krb5_error_code code, const char *fmt, ...)
#if !defined(__cplusplus) && (__GNUC__ > 2)
    __attribute__((__format__(__printf__, 3, 4)))
#endif
    ;

/**
 * Set an extended error message for an error code using a va_list.
 *
 * @param [in] ctx              Library context
 * @param [in] code             Error code
 * @param [in] fmt              Error string for the error code
 * @param [in] args             List of vprintf(3) style arguments
 */
void KRB5_CALLCONV
krb5_vset_error_message(krb5_context  ctx, krb5_error_code code,
                        const char *fmt, va_list args)
#if !defined(__cplusplus) && (__GNUC__ > 2)
    __attribute__((__format__(__printf__, 3, 0)))
#endif
    ;

/**
 * Add a prefix to the message for an error code.
 *
 * @param [in] ctx              Library context
 * @param [in] code             Error code
 * @param [in] fmt              Format string for error message prefix
 * @param [in] ...              printf(3) style parameters
 *
 * Format a message and prepend it to the current message for @a code.  The
 * prefix will be separated from the old message with a colon and space.
 */
void KRB5_CALLCONV_C
krb5_prepend_error_message(krb5_context ctx, krb5_error_code code,
                           const char *fmt, ...)
#if !defined(__cplusplus) && (__GNUC__ > 2)
    __attribute__((__format__(__printf__, 3, 4)))
#endif
    ;

/**
 * Add a prefix to the message for an error code using a va_list.
 *
 * @param [in] ctx              Library context
 * @param [in] code             Error code
 * @param [in] fmt              Format string for error message prefix
 * @param [in] args             List of vprintf(3) style arguments
 *
 * This function is similar to krb5_prepend_error_message(), but uses a
 * va_list instead of variadic arguments.
 */
void KRB5_CALLCONV
krb5_vprepend_error_message(krb5_context  ctx, krb5_error_code code,
                        const char *fmt, va_list args)
#if !defined(__cplusplus) && (__GNUC__ > 2)
    __attribute__((__format__(__printf__, 3, 0)))
#endif
    ;

/**
 * Add a prefix to a different error code's message.
 *
 * @param [in] ctx              Library context
 * @param [in] old_code         Previous error code
 * @param [in] code             Error code
 * @param [in] fmt              Format string for error message prefix
 * @param [in] ...              printf(3) style parameters
 *
 * Format a message and prepend it to the message for @a old_code.  The prefix
 * will be separated from the old message with a colon and space.  Set the
 * resulting message as the extended error message for @a code.
 */
void KRB5_CALLCONV_C
krb5_wrap_error_message(krb5_context ctx, krb5_error_code old_code,
                        krb5_error_code code, const char *fmt, ...)
#if !defined(__cplusplus) && (__GNUC__ > 2)
    __attribute__((__format__(__printf__, 4, 5)))
#endif
    ;

/**
 * Add a prefix to a different error code's message using a va_list.
 *
 * @param [in] ctx              Library context
 * @param [in] old_code         Previous error code
 * @param [in] code             Error code
 * @param [in] fmt              Format string for error message prefix
 * @param [in] args             List of vprintf(3) style arguments
 *
 * This function is similar to krb5_wrap_error_message(), but uses a
 * va_list instead of variadic arguments.
 */
void KRB5_CALLCONV
krb5_vwrap_error_message(krb5_context ctx, krb5_error_code old_code,
                         krb5_error_code code, const char *fmt, va_list args)
#if !defined(__cplusplus) && (__GNUC__ > 2)
    __attribute__((__format__(__printf__, 4, 0)))
#endif
    ;

/**
 * Copy the most recent extended error message from one context to another.
 *
 * @param [in] dest_ctx         Library context to copy message to
 * @param [in] src_ctx          Library context with current message
 */
void KRB5_CALLCONV
krb5_copy_error_message(krb5_context dest_ctx, krb5_context src_ctx);

/**
 * Get the (possibly extended) error message for a code.
 *
 * @param [in] ctx              Library context
 * @param [in] code             Error code
 *
 * The behavior of krb5_get_error_message() is only defined the first time it
 * is called after a failed call to a krb5 function using the same context, and
 * only when the error code passed in is the same as that returned by the krb5
 * function.
 *
 * This function never returns NULL, so its result may be used unconditionally
 * as a C string.
 *
 * The string returned by this function must be freed using
 * krb5_free_error_message()
 *
 * @note Future versions may return the same string for the second
 * and following calls.
 */
const char * KRB5_CALLCONV
krb5_get_error_message(krb5_context ctx, krb5_error_code code);

/**
 * Free an error message generated by krb5_get_error_message().
 *
 * @param [in] ctx              Library context
 * @param [in] msg              Pointer to error message
 */
void KRB5_CALLCONV
krb5_free_error_message(krb5_context ctx, const char *msg);

/**
 * Clear the extended error message in a context.
 *
 * @param [in] ctx              Library context
 *
 * This function unsets the extended error message in a context, to ensure that
 * it is not mistakenly applied to another occurrence of the same error code.
 */
void KRB5_CALLCONV
krb5_clear_error_message(krb5_context ctx);

/**
 * Unwrap authorization data.
 *
 * @param [in]  context         Library context
 * @param [in]  type            @ref KRB5_AUTHDATA type of @a container
 * @param [in]  container       Authorization data to be decoded
 * @param [out] authdata        List of decoded authorization data
 *
 * @sa krb5_encode_authdata_container()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_decode_authdata_container(krb5_context context,
                               krb5_authdatatype type,
                               const krb5_authdata *container,
                               krb5_authdata ***authdata);
/**
 * Wrap authorization data in a container.
 *
 * @param [in]  context         Library context
 * @param [in]  type            @ref KRB5_AUTHDATA type of @a container
 * @param [in]  authdata        List of authorization data to be encoded
 * @param [out] container       List of encoded authorization data
 *
 * The result is returned in @a container as a single-element list.
 *
 * @sa krb5_decode_authdata_container()
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_encode_authdata_container(krb5_context context,
                               krb5_authdatatype type,
                               krb5_authdata * const*authdata,
                               krb5_authdata ***container);

/*
 * AD-KDCIssued
 */
/**
 * Encode and sign AD-KDCIssued authorization data.
 *
 * @param [in]  context         Library context
 * @param [in]  key             Session key
 * @param [in]  issuer          The name of the issuing principal
 * @param [in]  authdata        List of authorization data to be signed
 * @param [out] ad_kdcissued    List containing AD-KDCIssued authdata
 *
 * This function wraps a list of authorization data entries @a authdata in an
 * AD-KDCIssued container (see RFC 4120 section 5.2.6.2) signed with @a key.
 * The result is returned in @a ad_kdcissued as a single-element list.
 */
krb5_error_code KRB5_CALLCONV
krb5_make_authdata_kdc_issued(krb5_context context,
                              const krb5_keyblock *key,
                              krb5_const_principal issuer,
                              krb5_authdata *const *authdata,
                              krb5_authdata ***ad_kdcissued);

/**
 * Unwrap and verify AD-KDCIssued authorization data.
 *
 * @param [in] context          Library context
 * @param [in] key              Session key
 * @param [in] ad_kdcissued     AD-KDCIssued authorization data to be unwrapped
 * @param [out] issuer          Name of issuing principal (or NULL)
 * @param [out] authdata        Unwrapped list of authorization data
 *
 * This function unwraps an AD-KDCIssued authdatum (see RFC 4120 section
 * 5.2.6.2) and verifies its signature against @a key.  The issuer field of the
 * authdatum element is returned in @a issuer, and the unwrapped list of
 * authdata is returned in @a authdata.
 */
krb5_error_code KRB5_CALLCONV
krb5_verify_authdata_kdc_issued(krb5_context context,
                                const krb5_keyblock *key,
                                const krb5_authdata *ad_kdcissued,
                                krb5_principal *issuer,
                                krb5_authdata ***authdata);

/*
 * Windows PAC
 */

/* Microsoft defined types of data */
#define KRB5_PAC_LOGON_INFO        1  /**< Logon information */
#define KRB5_PAC_CREDENTIALS_INFO  2  /**< Credentials information */
#define KRB5_PAC_SERVER_CHECKSUM   6  /**< Server checksum */
#define KRB5_PAC_PRIVSVR_CHECKSUM  7  /**< KDC checksum */
#define KRB5_PAC_CLIENT_INFO       10 /**< Client name and ticket info */
#define KRB5_PAC_DELEGATION_INFO   11 /**< Constrained delegation info */
#define KRB5_PAC_UPN_DNS_INFO      12 /**< User principal name and DNS info */
#define KRB5_PAC_CLIENT_CLAIMS     13 /**< Client claims information */
#define KRB5_PAC_DEVICE_INFO       14 /**< Device information */
#define KRB5_PAC_DEVICE_CLAIMS     15 /**< Device claims information */
#define KRB5_PAC_TICKET_CHECKSUM   16 /**< Ticket checksum */
#define KRB5_PAC_ATTRIBUTES_INFO   17 /**< PAC attributes */
#define KRB5_PAC_REQUESTOR         18 /**< PAC requestor SID */
#define KRB5_PAC_FULL_CHECKSUM     19 /**< KDC full checksum */

struct krb5_pac_data;
/** PAC data structure to convey authorization information */
typedef struct krb5_pac_data *krb5_pac;

/**
 * Add a buffer to a PAC handle.
 *
 * @param [in] context          Library context
 * @param [in] pac              PAC handle
 * @param [in] type             Buffer type
 * @param [in] data             contents
 *
 * This function adds a buffer of type @a type and contents @a data to @a pac
 * if there isn't already a buffer of this type present.
 *
 * The valid values of @a type is one of the following:
 * @li #KRB5_PAC_LOGON_INFO         -  Logon information
 * @li #KRB5_PAC_CREDENTIALS_INFO   -  Credentials information
 * @li #KRB5_PAC_SERVER_CHECKSUM    -  Server checksum
 * @li #KRB5_PAC_PRIVSVR_CHECKSUM   -  KDC checksum
 * @li #KRB5_PAC_CLIENT_INFO        -  Client name and ticket information
 * @li #KRB5_PAC_DELEGATION_INFO    -  Constrained delegation information
 * @li #KRB5_PAC_UPN_DNS_INFO       -  User principal name and DNS information
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_add_buffer(krb5_context context, krb5_pac pac, krb5_ui_4 type,
                    const krb5_data *data);

/**
 * Free a PAC handle.
 *
 * @param [in] context         Library context
 * @param [in] pac             PAC to be freed
 *
 * This function frees the contents of @a pac and the structure itself.
 */
void KRB5_CALLCONV
krb5_pac_free(krb5_context context, krb5_pac pac);

/**
 * Retrieve a buffer value from a PAC.
 *
 * @param [in]  context         Library context
 * @param [in]  pac             PAC handle
 * @param [in]  type            Type of buffer to retrieve
 * @param [out] data            Buffer value
 *
 * Use krb5_free_data_contents() to free @a data when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_get_buffer(krb5_context context, krb5_pac pac, krb5_ui_4 type,
                    krb5_data *data);

/**
 * Return an array of buffer types in a PAC handle.
 *
 * @param [in]  context         Library context
 * @param [in]  pac             PAC handle
 * @param [out] len             Number of entries in @a types
 * @param [out] types           Array of buffer types
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_get_types(krb5_context context, krb5_pac pac, size_t *len,
                   krb5_ui_4 **types);

/**
 * Create an empty Privilege Attribute Certificate (PAC) handle.
 *
 * @param [in]  context         Library context
 * @param [out] pac             New PAC handle
 *
 * Use krb5_pac_free() to free @a pac when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_init(krb5_context context, krb5_pac *pac);

/**
 * Unparse an encoded PAC into a new handle.
 *
 * @param [in]  context         Library context
 * @param [in]  ptr             PAC buffer
 * @param [in]  len             Length of @a ptr
 * @param [out] pac             PAC handle
 *
 * Use krb5_pac_free() to free @a pac when it is no longer needed.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_parse(krb5_context context, const void *ptr, size_t len,
               krb5_pac *pac);

/**
 * Verify a PAC.
 *
 * @param [in] context          Library context
 * @param [in] pac              PAC handle
 * @param [in] authtime         Expected timestamp
 * @param [in] principal        Expected principal name (or NULL)
 * @param [in] server           Key to validate server checksum (or NULL)
 * @param [in] privsvr          Key to validate KDC checksum (or NULL)
 *
 * This function validates @a pac against the supplied @a server, @a privsvr,
 * @a principal and @a authtime.  If @a principal is NULL, the principal and
 * authtime are not verified.  If @a server or @a privsvr is NULL, the
 * corresponding checksum is not verified.
 *
 * If successful, @a pac is marked as verified.
 *
 * @note A checksum mismatch can occur if the PAC was copied from a cross-realm
 * TGT by an ignorant KDC; also macOS Server Open Directory (as of 10.6)
 * generates PACs with no server checksum at all.  One should consider not
 * failing the whole authentication because of this reason, but, instead,
 * treating the ticket as if it did not contain a PAC or marking the PAC
 * information as non-verified.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_verify(krb5_context context, const krb5_pac pac,
                krb5_timestamp authtime, krb5_const_principal principal,
                const krb5_keyblock *server, const krb5_keyblock *privsvr);

/**
 * Verify a PAC, possibly from a specified realm.
 *
 * @param [in] context          Library context
 * @param [in] pac              PAC handle
 * @param [in] authtime         Expected timestamp
 * @param [in] principal        Expected principal name (or NULL)
 * @param [in] server           Key to validate server checksum (or NULL)
 * @param [in] privsvr          Key to validate KDC checksum (or NULL)
 * @param [in] with_realm       If true, expect the realm of @a principal
 *
 * This function is similar to krb5_pac_verify(), but adds a parameter
 * @a with_realm.  If @a with_realm is true, the PAC_CLIENT_INFO field is
 * expected to include the realm of @a principal as well as the name.  This
 * flag is necessary to verify PACs in cross-realm S4U2Self referral TGTs.
 *
 * @version New in 1.17
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_verify_ext(krb5_context context, const krb5_pac pac,
                    krb5_timestamp authtime, krb5_const_principal principal,
                    const krb5_keyblock *server, const krb5_keyblock *privsvr,
                    krb5_boolean with_realm);

/**
 * Verify a PAC, possibly including ticket signature
 *
 * @param [in] context          Library context
 * @param [in] enc_tkt          Ticket enc-part, possibly containing a PAC
 * @param [in] server_princ     Canonicalized name of ticket server
 * @param [in] server           Key to validate server checksum (or NULL)
 * @param [in] privsvr          Key to validate KDC checksum (or NULL)
 * @param [out] pac_out         Verified PAC (NULL if no PAC included)
 *
 * If a PAC is present in @a enc_tkt, verify its signatures.  If @a privsvr is
 * not NULL and @a server_princ is not a krbtgt or kadmin/changepw service,
 * require a ticket signature over @a enc_tkt in addition to the KDC signature.
 * Place the verified PAC in @a pac_out.  If an invalid PAC signature is found,
 * return an error matching the Windows KDC protocol code for that condition as
 * closely as possible.
 *
 * If no PAC is present in @a enc_tkt, set @a pac_out to NULL and return
 * successfully.
 *
 * @note This function does not validate the PAC_CLIENT_INFO buffer.  If a
 * specific value is expected, the caller can make a separate call to
 * krb5_pac_verify_ext() with a principal but no keys.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 *
 * @version New in 1.20
 */
krb5_error_code KRB5_CALLCONV
krb5_kdc_verify_ticket(krb5_context context, const krb5_enc_tkt_part *enc_tkt,
                       krb5_const_principal server_princ,
                       const krb5_keyblock *server,
                       const krb5_keyblock *privsvr, krb5_pac *pac_out);

/**
 * Verify a PAC, possibly including ticket signature
 *
 * @param [in] context              Library context
 * @param [in] enc_tkt              Ticket enc-part, possibly containing a PAC
 * @param [in] server_princ         Canonicalized name of ticket server
 * @param [in] server               Key to validate server checksum (or NULL)
 * @param [in] privsvr              Key to validate KDC checksum (or NULL)
 * @paran [in] optional_tkt_chksum  Whether to require a ticket checksum
 * @param [out] pac_out             Verified PAC (NULL if no PAC included)
 *
 * This function is an extension of krb5_kdc_verify_ticket(), adding the @a
 * optional_tkt_chksum parameter allowing to tolerate the absence of the PAC
 * ticket signature.
 *
 * If a PAC is present in @a enc_tkt, verify its signatures.  If @a privsvr is
 * not NULL and @a server_princ is not a krbtgt or kadmin/changepw service and
 * @a optional_tkt_chksum is FALSE, require a ticket signature over @a enc_tkt
 * in addition to the KDC signature. Place the verified PAC in @a pac_out.  If
 * an invalid PAC signature is found, return an error matching the Windows KDC
 * protocol code for that condition as closely as possible.
 *
 * If no PAC is present in @a enc_tkt, set @a pac_out to NULL and return
 * successfully.
 *
 * @note This function does not validate the PAC_CLIENT_INFO buffer.  If a
 * specific value is expected, the caller can make a separate call to
 * krb5_pac_verify_ext() with a principal but no keys.
 *
 * @retval 0 Success; otherwise - Kerberos error codes
 */
krb5_error_code KRB5_CALLCONV
krb5_kdc_verify_ticket_ext(krb5_context context,
                           const krb5_enc_tkt_part *enc_tkt,
                           krb5_const_principal server_princ,
                           const krb5_keyblock *server,
                           const krb5_keyblock *privsvr,
                           krb5_boolean optional_tkt_chksum,
                           krb5_pac *pac_out);

/** @deprecated Use krb5_kdc_sign_ticket() instead. */
krb5_error_code KRB5_CALLCONV
krb5_pac_sign(krb5_context context, krb5_pac pac, krb5_timestamp authtime,
              krb5_const_principal principal, const krb5_keyblock *server_key,
              const krb5_keyblock *privsvr_key, krb5_data *data);

/** @deprecated Use krb5_kdc_sign_ticket() instead. */
krb5_error_code KRB5_CALLCONV
krb5_pac_sign_ext(krb5_context context, krb5_pac pac, krb5_timestamp authtime,
                  krb5_const_principal principal,
                  const krb5_keyblock *server_key,
                  const krb5_keyblock *privsvr_key, krb5_boolean with_realm,
                  krb5_data *data);

/**
 * Sign a PAC, possibly including a ticket signature
 *
 * @param [in]  context         Library context
 * @param [in]  enc_tkt         The ticket for the signature
 * @param [in]  pac             PAC handle
 * @param [in]  server_princ    Canonical ticket server name
 * @param [in]  client_princ    PAC_CLIENT_INFO principal (or NULL)
 * @param [in]  server          Key for server checksum
 * @param [in]  privsvr         Key for KDC and ticket checksum
 * @param [in]  with_realm      If true, include the realm of @a principal
 *
 * Sign @a pac using the keys @a server and @a privsvr.  Include a ticket
 * signature over @a enc_tkt if @a server_princ is not a TGS or kadmin/changepw
 * principal name.  Add the signed PAC's encoding to the authorization data of
 * @a enc_tkt in the first slot, wrapped in an AD-IF-RELEVANT container.  If @a
 * client_princ is non-null, add a PAC_CLIENT_INFO buffer, including the realm
 * if @a with_realm is true.
 *
 * @retval 0 on success, otherwise - Kerberos error codes
 *
 * @version New in 1.20
 */
krb5_error_code KRB5_CALLCONV
krb5_kdc_sign_ticket(krb5_context context, krb5_enc_tkt_part *enc_tkt,
                     const krb5_pac pac, krb5_const_principal server_princ,
                     krb5_const_principal client_princ,
                     const krb5_keyblock *server, const krb5_keyblock *privsvr,
                     krb5_boolean with_realm);

/**
 * Read client information from a PAC.
 *
 * @param [in]  context         Library context
 * @param [in]  pac             PAC handle
 * @param [out] authtime_out    Authentication timestamp (NULL if not needed)
 * @param [out] princname_out   Client account name
 *
 * Read the PAC_CLIENT_INFO buffer in @a pac.  Place the client account name as
 * a string in @a princname_out.  If @a authtime_out is not NULL, place the
 * initial authentication timestamp in @a authtime_out.
 *
 * @retval 0 on success, ENOENT if no PAC_CLIENT_INFO buffer is present in @a
 * pac, ERANGE if the buffer contains invalid lengths.
 *
 * @version New in 1.18
 */
krb5_error_code KRB5_CALLCONV
krb5_pac_get_client_info(krb5_context context, const krb5_pac pac,
                         krb5_timestamp *authtime_out, char **princname_out);

/**
 * Allow the application to override the profile's allow_weak_crypto setting.
 *
 * @param [in] context          Library context
 * @param [in] enable           Boolean flag
 *
 * This function allows an application to override the allow_weak_crypto
 * setting.  It is primarily for use by aklog.
 *
 * @retval 0  (always)
 */
krb5_error_code KRB5_CALLCONV
krb5_allow_weak_crypto(krb5_context context, krb5_boolean enable);

/**
 * A wrapper for passing information to a @c krb5_trace_callback.
 *
 * Currently, it only contains the formatted message as determined
 * the the format string and arguments of the tracing macro, but it
 * may be extended to contain more fields in the future.
 */
typedef struct _krb5_trace_info {
    const char *message;
} krb5_trace_info;

typedef void
(KRB5_CALLCONV *krb5_trace_callback)(krb5_context context,
                                     const krb5_trace_info *info,
                                     void *cb_data);

/**
 * Specify a callback function for trace events.
 *
 * @param [in] context          Library context
 * @param [in] fn               Callback function
 * @param [in] cb_data          Callback data
 *
 * Specify a callback for trace events occurring in krb5 operations performed
 * within @a context.  @a fn will be invoked with @a context as the first
 * argument, @a cb_data as the last argument, and a pointer to a
 * krb5_trace_info as the second argument.  If the trace callback is reset via
 * this function or @a context is destroyed, @a fn will be invoked with a NULL
 * second argument so it can clean up @a cb_data.  Supply a NULL value for @a
 * fn to disable trace callbacks within @a context.
 *
 * @note This function overrides the information passed through the
 * @a KRB5_TRACE environment variable.
 *
 * @version New in 1.9
 *
 * @return Returns KRB5_TRACE_NOSUPP if tracing is not supported in the library
 * (unless @a fn is NULL).
 */
krb5_error_code KRB5_CALLCONV
krb5_set_trace_callback(krb5_context context, krb5_trace_callback fn,
                        void *cb_data);

/**
 * Specify a file name for directing trace events.
 *
 * @param [in] context          Library context
 * @param [in] filename         File name
 *
 * Open @a filename for appending (creating it, if necessary) and set up a
 * callback to write trace events to it.
 *
 * @note This function overrides the information passed through the
 * @a KRB5_TRACE environment variable.
 *
 * @version New in 1.9
 *
 * @retval KRB5_TRACE_NOSUPP Tracing is not supported in the library.
 */
krb5_error_code KRB5_CALLCONV
krb5_set_trace_filename(krb5_context context, const char *filename);

/**
 * Hook function for inspecting or modifying messages sent to KDCs.
 *
 * @param [in]  context         Library context
 * @param [in]  data            Callback data
 * @param [in]  realm           The realm the message will be sent to
 * @param [in]  message         The original message to be sent to the KDC
 * @param [out] new_message_out Optional replacement message to be sent
 * @param [out] new_reply_out   Optional synthetic reply
 *
 * If the hook function returns an error code, the KDC communication will be
 * aborted and the error code will be returned to the library operation which
 * initiated the communication.
 *
 * If the hook function sets @a new_reply_out, @a message will not be sent to
 * the KDC, and the given reply will used instead.
 *
 * If the hook function sets @a new_message_out, the given message will be sent
 * to the KDC in place of @a message.
 *
 * If the hook function returns successfully without setting either output,
 * @a message will be sent to the KDC normally.
 *
 * The hook function should use krb5_copy_data() to construct the value for
 * @a new_message_out or @a reply_out, to ensure that it can be freed correctly
 * by the library.
 *
 * @version New in 1.15
 *
 * @retval 0 Success
 * @return A Kerberos error code
 */
typedef krb5_error_code
(KRB5_CALLCONV *krb5_pre_send_fn)(krb5_context context, void *data,
                                  const krb5_data *realm,
                                  const krb5_data *message,
                                  krb5_data **new_message_out,
                                  krb5_data **new_reply_out);

/**
 * Hook function for inspecting or overriding KDC replies.
 *
 * @param [in]  context         Library context
 * @param [in]  data            Callback data
 * @param [in]  code            Status of KDC communication
 * @param [in]  realm           The realm the reply was received from
 * @param [in]  message         The message sent to the realm's KDC
 * @param [in]  reply           The reply received from the KDC
 * @param [out] new_reply_out   Optional replacement reply
 *
 * If @a code is zero, @a reply contains the reply received from the KDC.  The
 * hook function may return an error code to simulate an error, may synthesize
 * a different reply by setting @a new_reply_out, or may simply return
 * successfully to do nothing.
 *
 * If @a code is non-zero, KDC communication failed and @a reply should be
 * ignored.  The hook function may return @a code or a different error code, or
 * may synthesize a reply by setting @a new_reply_out and return successfully.
 *
 * The hook function should use krb5_copy_data() to construct the value for
 * @a new_reply_out, to ensure that it can be freed correctly by the library.
 *
 * @version New in 1.15
 *
 * @retval 0 Success
 * @return A Kerberos error code
 */
typedef krb5_error_code
(KRB5_CALLCONV *krb5_post_recv_fn)(krb5_context context, void *data,
                                   krb5_error_code code,
                                   const krb5_data *realm,
                                   const krb5_data *message,
                                   const krb5_data *reply,
                                   krb5_data **new_reply_out);

/**
 * Set a KDC pre-send hook function.
 *
 * @param [in] context          Library context
 * @param [in] send_hook        Hook function (or NULL to disable the hook)
 * @param [in] data             Callback data to be passed to @a send_hook
 *
 * @a send_hook will be called before messages are sent to KDCs by library
 * functions such as krb5_get_credentials().  The hook function may inspect,
 * override, or synthesize its own reply to the message.
 *
 * @version New in 1.15
 */
void KRB5_CALLCONV
krb5_set_kdc_send_hook(krb5_context context, krb5_pre_send_fn send_hook,
                       void *data);

/**
 * Set a KDC post-receive hook function.
 *
 * @param [in] context          The library context.
 * @param [in] recv_hook        Hook function (or NULL to disable the hook)
 * @param [in] data             Callback data to be passed to @a recv_hook
 *
 * @a recv_hook will be called after a reply is received from a KDC during a
 * call to a library function such as krb5_get_credentials().  The hook
 * function may inspect or override the reply.  This hook will not be executed
 * if the pre-send hook returns a synthetic reply.
 *
 * @version New in 1.15
 */
void KRB5_CALLCONV
krb5_set_kdc_recv_hook(krb5_context context, krb5_post_recv_fn recv_hook,
                       void *data);

#if defined(__APPLE__) && (defined(__ppc__) || defined(__ppc64__) || defined(__i386__) || defined(__x86_64__))
#pragma pack(pop)
#endif

KRB5INT_END_DECLS

/* Don't use this!  We're going to phase it out.  It's just here to keep
   applications from breaking right away.  */
#define krb5_const const

#undef KRB5_ATTR_DEPRECATED

/** @} */ /* end of KRB5_H group */

#endif /* KRB5_GENERAL__ */
/*
 * et-h-krb5_err.h:
 * This file is automatically generated; please do not edit it.
 */

#include <et/com_err.h>

#define KRB5KDC_ERR_NONE                         (-1765328384L)
#define KRB5KDC_ERR_NAME_EXP                     (-1765328383L)
#define KRB5KDC_ERR_SERVICE_EXP                  (-1765328382L)
#define KRB5KDC_ERR_BAD_PVNO                     (-1765328381L)
#define KRB5KDC_ERR_C_OLD_MAST_KVNO              (-1765328380L)
#define KRB5KDC_ERR_S_OLD_MAST_KVNO              (-1765328379L)
#define KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN          (-1765328378L)
#define KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN          (-1765328377L)
#define KRB5KDC_ERR_PRINCIPAL_NOT_UNIQUE         (-1765328376L)
#define KRB5KDC_ERR_NULL_KEY                     (-1765328375L)
#define KRB5KDC_ERR_CANNOT_POSTDATE              (-1765328374L)
#define KRB5KDC_ERR_NEVER_VALID                  (-1765328373L)
#define KRB5KDC_ERR_POLICY                       (-1765328372L)
#define KRB5KDC_ERR_BADOPTION                    (-1765328371L)
#define KRB5KDC_ERR_ETYPE_NOSUPP                 (-1765328370L)
#define KRB5KDC_ERR_SUMTYPE_NOSUPP               (-1765328369L)
#define KRB5KDC_ERR_PADATA_TYPE_NOSUPP           (-1765328368L)
#define KRB5KDC_ERR_TRTYPE_NOSUPP                (-1765328367L)
#define KRB5KDC_ERR_CLIENT_REVOKED               (-1765328366L)
#define KRB5KDC_ERR_SERVICE_REVOKED              (-1765328365L)
#define KRB5KDC_ERR_TGT_REVOKED                  (-1765328364L)
#define KRB5KDC_ERR_CLIENT_NOTYET                (-1765328363L)
#define KRB5KDC_ERR_SERVICE_NOTYET               (-1765328362L)
#define KRB5KDC_ERR_KEY_EXP                      (-1765328361L)
#define KRB5KDC_ERR_PREAUTH_FAILED               (-1765328360L)
#define KRB5KDC_ERR_PREAUTH_REQUIRED             (-1765328359L)
#define KRB5KDC_ERR_SERVER_NOMATCH               (-1765328358L)
#define KRB5KDC_ERR_MUST_USE_USER2USER           (-1765328357L)
#define KRB5KDC_ERR_PATH_NOT_ACCEPTED            (-1765328356L)
#define KRB5KDC_ERR_SVC_UNAVAILABLE              (-1765328355L)
#define KRB5PLACEHOLD_30                         (-1765328354L)
#define KRB5KRB_AP_ERR_BAD_INTEGRITY             (-1765328353L)
#define KRB5KRB_AP_ERR_TKT_EXPIRED               (-1765328352L)
#define KRB5KRB_AP_ERR_TKT_NYV                   (-1765328351L)
#define KRB5KRB_AP_ERR_REPEAT                    (-1765328350L)
#define KRB5KRB_AP_ERR_NOT_US                    (-1765328349L)
#define KRB5KRB_AP_ERR_BADMATCH                  (-1765328348L)
#define KRB5KRB_AP_ERR_SKEW                      (-1765328347L)
#define KRB5KRB_AP_ERR_BADADDR                   (-1765328346L)
#define KRB5KRB_AP_ERR_BADVERSION                (-1765328345L)
#define KRB5KRB_AP_ERR_MSG_TYPE                  (-1765328344L)
#define KRB5KRB_AP_ERR_MODIFIED                  (-1765328343L)
#define KRB5KRB_AP_ERR_BADORDER                  (-1765328342L)
#define KRB5KRB_AP_ERR_ILL_CR_TKT                (-1765328341L)
#define KRB5KRB_AP_ERR_BADKEYVER                 (-1765328340L)
#define KRB5KRB_AP_ERR_NOKEY                     (-1765328339L)
#define KRB5KRB_AP_ERR_MUT_FAIL                  (-1765328338L)
#define KRB5KRB_AP_ERR_BADDIRECTION              (-1765328337L)
#define KRB5KRB_AP_ERR_METHOD                    (-1765328336L)
#define KRB5KRB_AP_ERR_BADSEQ                    (-1765328335L)
#define KRB5KRB_AP_ERR_INAPP_CKSUM               (-1765328334L)
#define KRB5KRB_AP_PATH_NOT_ACCEPTED             (-1765328333L)
#define KRB5KRB_ERR_RESPONSE_TOO_BIG             (-1765328332L)
#define KRB5PLACEHOLD_53                         (-1765328331L)
#define KRB5PLACEHOLD_54                         (-1765328330L)
#define KRB5PLACEHOLD_55                         (-1765328329L)
#define KRB5PLACEHOLD_56                         (-1765328328L)
#define KRB5PLACEHOLD_57                         (-1765328327L)
#define KRB5PLACEHOLD_58                         (-1765328326L)
#define KRB5PLACEHOLD_59                         (-1765328325L)
#define KRB5KRB_ERR_GENERIC                      (-1765328324L)
#define KRB5KRB_ERR_FIELD_TOOLONG                (-1765328323L)
#define KRB5KDC_ERR_CLIENT_NOT_TRUSTED           (-1765328322L)
#define KRB5KDC_ERR_KDC_NOT_TRUSTED              (-1765328321L)
#define KRB5KDC_ERR_INVALID_SIG                  (-1765328320L)
#define KRB5KDC_ERR_DH_KEY_PARAMETERS_NOT_ACCEPTED (-1765328319L)
#define KRB5KDC_ERR_CERTIFICATE_MISMATCH         (-1765328318L)
#define KRB5KRB_AP_ERR_NO_TGT                    (-1765328317L)
#define KRB5KDC_ERR_WRONG_REALM                  (-1765328316L)
#define KRB5KRB_AP_ERR_USER_TO_USER_REQUIRED     (-1765328315L)
#define KRB5KDC_ERR_CANT_VERIFY_CERTIFICATE      (-1765328314L)
#define KRB5KDC_ERR_INVALID_CERTIFICATE          (-1765328313L)
#define KRB5KDC_ERR_REVOKED_CERTIFICATE          (-1765328312L)
#define KRB5KDC_ERR_REVOCATION_STATUS_UNKNOWN    (-1765328311L)
#define KRB5KDC_ERR_REVOCATION_STATUS_UNAVAILABLE (-1765328310L)
#define KRB5KDC_ERR_CLIENT_NAME_MISMATCH         (-1765328309L)
#define KRB5KDC_ERR_KDC_NAME_MISMATCH            (-1765328308L)
#define KRB5KDC_ERR_INCONSISTENT_KEY_PURPOSE     (-1765328307L)
#define KRB5KDC_ERR_DIGEST_IN_CERT_NOT_ACCEPTED  (-1765328306L)
#define KRB5KDC_ERR_PA_CHECKSUM_MUST_BE_INCLUDED (-1765328305L)
#define KRB5KDC_ERR_DIGEST_IN_SIGNED_DATA_NOT_ACCEPTED (-1765328304L)
#define KRB5KDC_ERR_PUBLIC_KEY_ENCRYPTION_NOT_SUPPORTED (-1765328303L)
#define KRB5PLACEHOLD_82                         (-1765328302L)
#define KRB5PLACEHOLD_83                         (-1765328301L)
#define KRB5PLACEHOLD_84                         (-1765328300L)
#define KRB5KRB_AP_ERR_IAKERB_KDC_NOT_FOUND      (-1765328299L)
#define KRB5KRB_AP_ERR_IAKERB_KDC_NO_RESPONSE    (-1765328298L)
#define KRB5PLACEHOLD_87                         (-1765328297L)
#define KRB5PLACEHOLD_88                         (-1765328296L)
#define KRB5PLACEHOLD_89                         (-1765328295L)
#define KRB5KDC_ERR_PREAUTH_EXPIRED              (-1765328294L)
#define KRB5KDC_ERR_MORE_PREAUTH_DATA_REQUIRED   (-1765328293L)
#define KRB5PLACEHOLD_92                         (-1765328292L)
#define KRB5KDC_ERR_UNKNOWN_CRITICAL_FAST_OPTION (-1765328291L)
#define KRB5PLACEHOLD_94                         (-1765328290L)
#define KRB5PLACEHOLD_95                         (-1765328289L)
#define KRB5PLACEHOLD_96                         (-1765328288L)
#define KRB5PLACEHOLD_97                         (-1765328287L)
#define KRB5PLACEHOLD_98                         (-1765328286L)
#define KRB5PLACEHOLD_99                         (-1765328285L)
#define KRB5KDC_ERR_NO_ACCEPTABLE_KDF            (-1765328284L)
#define KRB5PLACEHOLD_101                        (-1765328283L)
#define KRB5PLACEHOLD_102                        (-1765328282L)
#define KRB5PLACEHOLD_103                        (-1765328281L)
#define KRB5PLACEHOLD_104                        (-1765328280L)
#define KRB5PLACEHOLD_105                        (-1765328279L)
#define KRB5PLACEHOLD_106                        (-1765328278L)
#define KRB5PLACEHOLD_107                        (-1765328277L)
#define KRB5PLACEHOLD_108                        (-1765328276L)
#define KRB5PLACEHOLD_109                        (-1765328275L)
#define KRB5PLACEHOLD_110                        (-1765328274L)
#define KRB5PLACEHOLD_111                        (-1765328273L)
#define KRB5PLACEHOLD_112                        (-1765328272L)
#define KRB5PLACEHOLD_113                        (-1765328271L)
#define KRB5PLACEHOLD_114                        (-1765328270L)
#define KRB5PLACEHOLD_115                        (-1765328269L)
#define KRB5PLACEHOLD_116                        (-1765328268L)
#define KRB5PLACEHOLD_117                        (-1765328267L)
#define KRB5PLACEHOLD_118                        (-1765328266L)
#define KRB5PLACEHOLD_119                        (-1765328265L)
#define KRB5PLACEHOLD_120                        (-1765328264L)
#define KRB5PLACEHOLD_121                        (-1765328263L)
#define KRB5PLACEHOLD_122                        (-1765328262L)
#define KRB5PLACEHOLD_123                        (-1765328261L)
#define KRB5PLACEHOLD_124                        (-1765328260L)
#define KRB5PLACEHOLD_125                        (-1765328259L)
#define KRB5PLACEHOLD_126                        (-1765328258L)
#define KRB5PLACEHOLD_127                        (-1765328257L)
#define KRB5_ERR_RCSID                           (-1765328256L)
#define KRB5_LIBOS_BADLOCKFLAG                   (-1765328255L)
#define KRB5_LIBOS_CANTREADPWD                   (-1765328254L)
#define KRB5_LIBOS_BADPWDMATCH                   (-1765328253L)
#define KRB5_LIBOS_PWDINTR                       (-1765328252L)
#define KRB5_PARSE_ILLCHAR                       (-1765328251L)
#define KRB5_PARSE_MALFORMED                     (-1765328250L)
#define KRB5_CONFIG_CANTOPEN                     (-1765328249L)
#define KRB5_CONFIG_BADFORMAT                    (-1765328248L)
#define KRB5_CONFIG_NOTENUFSPACE                 (-1765328247L)
#define KRB5_BADMSGTYPE                          (-1765328246L)
#define KRB5_CC_BADNAME                          (-1765328245L)
#define KRB5_CC_UNKNOWN_TYPE                     (-1765328244L)
#define KRB5_CC_NOTFOUND                         (-1765328243L)
#define KRB5_CC_END                              (-1765328242L)
#define KRB5_NO_TKT_SUPPLIED                     (-1765328241L)
#define KRB5KRB_AP_WRONG_PRINC                   (-1765328240L)
#define KRB5KRB_AP_ERR_TKT_INVALID               (-1765328239L)
#define KRB5_PRINC_NOMATCH                       (-1765328238L)
#define KRB5_KDCREP_MODIFIED                     (-1765328237L)
#define KRB5_KDCREP_SKEW                         (-1765328236L)
#define KRB5_IN_TKT_REALM_MISMATCH               (-1765328235L)
#define KRB5_PROG_ETYPE_NOSUPP                   (-1765328234L)
#define KRB5_PROG_KEYTYPE_NOSUPP                 (-1765328233L)
#define KRB5_WRONG_ETYPE                         (-1765328232L)
#define KRB5_PROG_SUMTYPE_NOSUPP                 (-1765328231L)
#define KRB5_REALM_UNKNOWN                       (-1765328230L)
#define KRB5_SERVICE_UNKNOWN                     (-1765328229L)
#define KRB5_KDC_UNREACH                         (-1765328228L)
#define KRB5_NO_LOCALNAME                        (-1765328227L)
#define KRB5_MUTUAL_FAILED                       (-1765328226L)
#define KRB5_RC_TYPE_EXISTS                      (-1765328225L)
#define KRB5_RC_MALLOC                           (-1765328224L)
#define KRB5_RC_TYPE_NOTFOUND                    (-1765328223L)
#define KRB5_RC_UNKNOWN                          (-1765328222L)
#define KRB5_RC_REPLAY                           (-1765328221L)
#define KRB5_RC_IO                               (-1765328220L)
#define KRB5_RC_NOIO                             (-1765328219L)
#define KRB5_RC_PARSE                            (-1765328218L)
#define KRB5_RC_IO_EOF                           (-1765328217L)
#define KRB5_RC_IO_MALLOC                        (-1765328216L)
#define KRB5_RC_IO_PERM                          (-1765328215L)
#define KRB5_RC_IO_IO                            (-1765328214L)
#define KRB5_RC_IO_UNKNOWN                       (-1765328213L)
#define KRB5_RC_IO_SPACE                         (-1765328212L)
#define KRB5_TRANS_CANTOPEN                      (-1765328211L)
#define KRB5_TRANS_BADFORMAT                     (-1765328210L)
#define KRB5_LNAME_CANTOPEN                      (-1765328209L)
#define KRB5_LNAME_NOTRANS                       (-1765328208L)
#define KRB5_LNAME_BADFORMAT                     (-1765328207L)
#define KRB5_CRYPTO_INTERNAL                     (-1765328206L)
#define KRB5_KT_BADNAME                          (-1765328205L)
#define KRB5_KT_UNKNOWN_TYPE                     (-1765328204L)
#define KRB5_KT_NOTFOUND                         (-1765328203L)
#define KRB5_KT_END                              (-1765328202L)
#define KRB5_KT_NOWRITE                          (-1765328201L)
#define KRB5_KT_IOERR                            (-1765328200L)
#define KRB5_NO_TKT_IN_RLM                       (-1765328199L)
#define KRB5DES_BAD_KEYPAR                       (-1765328198L)
#define KRB5DES_WEAK_KEY                         (-1765328197L)
#define KRB5_BAD_ENCTYPE                         (-1765328196L)
#define KRB5_BAD_KEYSIZE                         (-1765328195L)
#define KRB5_BAD_MSIZE                           (-1765328194L)
#define KRB5_CC_TYPE_EXISTS                      (-1765328193L)
#define KRB5_KT_TYPE_EXISTS                      (-1765328192L)
#define KRB5_CC_IO                               (-1765328191L)
#define KRB5_FCC_PERM                            (-1765328190L)
#define KRB5_FCC_NOFILE                          (-1765328189L)
#define KRB5_FCC_INTERNAL                        (-1765328188L)
#define KRB5_CC_WRITE                            (-1765328187L)
#define KRB5_CC_NOMEM                            (-1765328186L)
#define KRB5_CC_FORMAT                           (-1765328185L)
#define KRB5_CC_NOT_KTYPE                        (-1765328184L)
#define KRB5_INVALID_FLAGS                       (-1765328183L)
#define KRB5_NO_2ND_TKT                          (-1765328182L)
#define KRB5_NOCREDS_SUPPLIED                    (-1765328181L)
#define KRB5_SENDAUTH_BADAUTHVERS                (-1765328180L)
#define KRB5_SENDAUTH_BADAPPLVERS                (-1765328179L)
#define KRB5_SENDAUTH_BADRESPONSE                (-1765328178L)
#define KRB5_SENDAUTH_REJECTED                   (-1765328177L)
#define KRB5_PREAUTH_BAD_TYPE                    (-1765328176L)
#define KRB5_PREAUTH_NO_KEY                      (-1765328175L)
#define KRB5_PREAUTH_FAILED                      (-1765328174L)
#define KRB5_RCACHE_BADVNO                       (-1765328173L)
#define KRB5_CCACHE_BADVNO                       (-1765328172L)
#define KRB5_KEYTAB_BADVNO                       (-1765328171L)
#define KRB5_PROG_ATYPE_NOSUPP                   (-1765328170L)
#define KRB5_RC_REQUIRED                         (-1765328169L)
#define KRB5_ERR_BAD_HOSTNAME                    (-1765328168L)
#define KRB5_ERR_HOST_REALM_UNKNOWN              (-1765328167L)
#define KRB5_SNAME_UNSUPP_NAMETYPE               (-1765328166L)
#define KRB5KRB_AP_ERR_V4_REPLY                  (-1765328165L)
#define KRB5_REALM_CANT_RESOLVE                  (-1765328164L)
#define KRB5_TKT_NOT_FORWARDABLE                 (-1765328163L)
#define KRB5_FWD_BAD_PRINCIPAL                   (-1765328162L)
#define KRB5_GET_IN_TKT_LOOP                     (-1765328161L)
#define KRB5_CONFIG_NODEFREALM                   (-1765328160L)
#define KRB5_SAM_UNSUPPORTED                     (-1765328159L)
#define KRB5_SAM_INVALID_ETYPE                   (-1765328158L)
#define KRB5_SAM_NO_CHECKSUM                     (-1765328157L)
#define KRB5_SAM_BAD_CHECKSUM                    (-1765328156L)
#define KRB5_KT_NAME_TOOLONG                     (-1765328155L)
#define KRB5_KT_KVNONOTFOUND                     (-1765328154L)
#define KRB5_APPL_EXPIRED                        (-1765328153L)
#define KRB5_LIB_EXPIRED                         (-1765328152L)
#define KRB5_CHPW_PWDNULL                        (-1765328151L)
#define KRB5_CHPW_FAIL                           (-1765328150L)
#define KRB5_KT_FORMAT                           (-1765328149L)
#define KRB5_NOPERM_ETYPE                        (-1765328148L)
#define KRB5_CONFIG_ETYPE_NOSUPP                 (-1765328147L)
#define KRB5_OBSOLETE_FN                         (-1765328146L)
#define KRB5_EAI_FAIL                            (-1765328145L)
#define KRB5_EAI_NODATA                          (-1765328144L)
#define KRB5_EAI_NONAME                          (-1765328143L)
#define KRB5_EAI_SERVICE                         (-1765328142L)
#define KRB5_ERR_NUMERIC_REALM                   (-1765328141L)
#define KRB5_ERR_BAD_S2K_PARAMS                  (-1765328140L)
#define KRB5_ERR_NO_SERVICE                      (-1765328139L)
#define KRB5_CC_READONLY                         (-1765328138L)
#define KRB5_CC_NOSUPP                           (-1765328137L)
#define KRB5_DELTAT_BADFORMAT                    (-1765328136L)
#define KRB5_PLUGIN_NO_HANDLE                    (-1765328135L)
#define KRB5_PLUGIN_OP_NOTSUPP                   (-1765328134L)
#define KRB5_ERR_INVALID_UTF8                    (-1765328133L)
#define KRB5_ERR_FAST_REQUIRED                   (-1765328132L)
#define KRB5_LOCAL_ADDR_REQUIRED                 (-1765328131L)
#define KRB5_REMOTE_ADDR_REQUIRED                (-1765328130L)
#define KRB5_TRACE_NOSUPP                        (-1765328129L)
extern const struct error_table et_krb5_error_table;
extern void initialize_krb5_error_table(void);

/* For compatibility with Heimdal */
extern void initialize_krb5_error_table_r(struct et_list **list);

#define ERROR_TABLE_BASE_krb5 (-1765328384L)

/* for compatibility with older versions... */
#define init_krb5_err_tbl initialize_krb5_error_table
#define krb5_err_base ERROR_TABLE_BASE_krb5
/*
 * et-h-k5e1_err.h:
 * This file is automatically generated; please do not edit it.
 */

#include <et/com_err.h>

#define KRB5_PLUGIN_VER_NOTSUPP                  (-1750600192L)
#define KRB5_PLUGIN_BAD_MODULE_SPEC              (-1750600191L)
#define KRB5_PLUGIN_NAME_NOTFOUND                (-1750600190L)
#define KRB5KDC_ERR_DISCARD                      (-1750600189L)
#define KRB5_DCC_CANNOT_CREATE                   (-1750600188L)
#define KRB5_KCC_INVALID_ANCHOR                  (-1750600187L)
#define KRB5_KCC_UNKNOWN_VERSION                 (-1750600186L)
#define KRB5_KCC_INVALID_UID                     (-1750600185L)
#define KRB5_KCM_MALFORMED_REPLY                 (-1750600184L)
#define KRB5_KCM_RPC_ERROR                       (-1750600183L)
#define KRB5_KCM_REPLY_TOO_BIG                   (-1750600182L)
#define KRB5_KCM_NO_SERVER                       (-1750600181L)
#define KRB5_CERTAUTH_HWAUTH                     (-1750600180L)
#define KRB5_CERTAUTH_HWAUTH_PASS                (-1750600179L)
extern const struct error_table et_k5e1_error_table;
extern void initialize_k5e1_error_table(void);

/* For compatibility with Heimdal */
extern void initialize_k5e1_error_table_r(struct et_list **list);

#define ERROR_TABLE_BASE_k5e1 (-1750600192L)

/* for compatibility with older versions... */
#define init_k5e1_err_tbl initialize_k5e1_error_table
#define k5e1_err_base ERROR_TABLE_BASE_k5e1
/*
 * et-h-kdb5_err.h:
 * This file is automatically generated; please do not edit it.
 */

#include <et/com_err.h>

#define KRB5_KDB_RCSID                           (-1780008448L)
#define KRB5_KDB_INUSE                           (-1780008447L)
#define KRB5_KDB_UK_SERROR                       (-1780008446L)
#define KRB5_KDB_UK_RERROR                       (-1780008445L)
#define KRB5_KDB_UNAUTH                          (-1780008444L)
#define KRB5_KDB_NOENTRY                         (-1780008443L)
#define KRB5_KDB_ILL_WILDCARD                    (-1780008442L)
#define KRB5_KDB_DB_INUSE                        (-1780008441L)
#define KRB5_KDB_DB_CHANGED                      (-1780008440L)
#define KRB5_KDB_TRUNCATED_RECORD                (-1780008439L)
#define KRB5_KDB_RECURSIVELOCK                   (-1780008438L)
#define KRB5_KDB_NOTLOCKED                       (-1780008437L)
#define KRB5_KDB_BADLOCKMODE                     (-1780008436L)
#define KRB5_KDB_DBNOTINITED                     (-1780008435L)
#define KRB5_KDB_DBINITED                        (-1780008434L)
#define KRB5_KDB_ILLDIRECTION                    (-1780008433L)
#define KRB5_KDB_NOMASTERKEY                     (-1780008432L)
#define KRB5_KDB_BADMASTERKEY                    (-1780008431L)
#define KRB5_KDB_INVALIDKEYSIZE                  (-1780008430L)
#define KRB5_KDB_CANTREAD_STORED                 (-1780008429L)
#define KRB5_KDB_BADSTORED_MKEY                  (-1780008428L)
#define KRB5_KDB_NOACTMASTERKEY                  (-1780008427L)
#define KRB5_KDB_KVNONOMATCH                     (-1780008426L)
#define KRB5_KDB_STORED_MKEY_NOTCURRENT          (-1780008425L)
#define KRB5_KDB_CANTLOCK_DB                     (-1780008424L)
#define KRB5_KDB_DB_CORRUPT                      (-1780008423L)
#define KRB5_KDB_BAD_VERSION                     (-1780008422L)
#define KRB5_KDB_BAD_SALTTYPE                    (-1780008421L)
#define KRB5_KDB_BAD_ENCTYPE                     (-1780008420L)
#define KRB5_KDB_BAD_CREATEFLAGS                 (-1780008419L)
#define KRB5_KDB_NO_PERMITTED_KEY                (-1780008418L)
#define KRB5_KDB_NO_MATCHING_KEY                 (-1780008417L)
#define KRB5_KDB_DBTYPE_NOTFOUND                 (-1780008416L)
#define KRB5_KDB_DBTYPE_NOSUP                    (-1780008415L)
#define KRB5_KDB_DBTYPE_INIT                     (-1780008414L)
#define KRB5_KDB_SERVER_INTERNAL_ERR             (-1780008413L)
#define KRB5_KDB_ACCESS_ERROR                    (-1780008412L)
#define KRB5_KDB_INTERNAL_ERROR                  (-1780008411L)
#define KRB5_KDB_CONSTRAINT_VIOLATION            (-1780008410L)
#define KRB5_LOG_CONV                            (-1780008409L)
#define KRB5_LOG_UNSTABLE                        (-1780008408L)
#define KRB5_LOG_CORRUPT                         (-1780008407L)
#define KRB5_LOG_ERROR                           (-1780008406L)
#define KRB5_KDB_DBTYPE_MISMATCH                 (-1780008405L)
#define KRB5_KDB_POLICY_REF                      (-1780008404L)
#define KRB5_KDB_STRINGS_TOOLONG                 (-1780008403L)
extern const struct error_table et_kdb5_error_table;
extern void initialize_kdb5_error_table(void);

/* For compatibility with Heimdal */
extern void initialize_kdb5_error_table_r(struct et_list **list);

#define ERROR_TABLE_BASE_kdb5 (-1780008448L)

/* for compatibility with older versions... */
#define init_kdb5_err_tbl initialize_kdb5_error_table
#define kdb5_err_base ERROR_TABLE_BASE_kdb5
/*
 * et-h-kv5m_err.h:
 * This file is automatically generated; please do not edit it.
 */

#include <et/com_err.h>

#define KV5M_NONE                                (-1760647424L)
#define KV5M_PRINCIPAL                           (-1760647423L)
#define KV5M_DATA                                (-1760647422L)
#define KV5M_KEYBLOCK                            (-1760647421L)
#define KV5M_CHECKSUM                            (-1760647420L)
#define KV5M_ENCRYPT_BLOCK                       (-1760647419L)
#define KV5M_ENC_DATA                            (-1760647418L)
#define KV5M_CRYPTOSYSTEM_ENTRY                  (-1760647417L)
#define KV5M_CS_TABLE_ENTRY                      (-1760647416L)
#define KV5M_CHECKSUM_ENTRY                      (-1760647415L)
#define KV5M_AUTHDATA                            (-1760647414L)
#define KV5M_TRANSITED                           (-1760647413L)
#define KV5M_ENC_TKT_PART                        (-1760647412L)
#define KV5M_TICKET                              (-1760647411L)
#define KV5M_AUTHENTICATOR                       (-1760647410L)
#define KV5M_TKT_AUTHENT                         (-1760647409L)
#define KV5M_CREDS                               (-1760647408L)
#define KV5M_LAST_REQ_ENTRY                      (-1760647407L)
#define KV5M_PA_DATA                             (-1760647406L)
#define KV5M_KDC_REQ                             (-1760647405L)
#define KV5M_ENC_KDC_REP_PART                    (-1760647404L)
#define KV5M_KDC_REP                             (-1760647403L)
#define KV5M_ERROR                               (-1760647402L)
#define KV5M_AP_REQ                              (-1760647401L)
#define KV5M_AP_REP                              (-1760647400L)
#define KV5M_AP_REP_ENC_PART                     (-1760647399L)
#define KV5M_RESPONSE                            (-1760647398L)
#define KV5M_SAFE                                (-1760647397L)
#define KV5M_PRIV                                (-1760647396L)
#define KV5M_PRIV_ENC_PART                       (-1760647395L)
#define KV5M_CRED                                (-1760647394L)
#define KV5M_CRED_INFO                           (-1760647393L)
#define KV5M_CRED_ENC_PART                       (-1760647392L)
#define KV5M_PWD_DATA                            (-1760647391L)
#define KV5M_ADDRESS                             (-1760647390L)
#define KV5M_KEYTAB_ENTRY                        (-1760647389L)
#define KV5M_CONTEXT                             (-1760647388L)
#define KV5M_OS_CONTEXT                          (-1760647387L)
#define KV5M_ALT_METHOD                          (-1760647386L)
#define KV5M_ETYPE_INFO_ENTRY                    (-1760647385L)
#define KV5M_DB_CONTEXT                          (-1760647384L)
#define KV5M_AUTH_CONTEXT                        (-1760647383L)
#define KV5M_KEYTAB                              (-1760647382L)
#define KV5M_RCACHE                              (-1760647381L)
#define KV5M_CCACHE                              (-1760647380L)
#define KV5M_PREAUTH_OPS                         (-1760647379L)
#define KV5M_SAM_CHALLENGE                       (-1760647378L)
#define KV5M_SAM_CHALLENGE_2                     (-1760647377L)
#define KV5M_SAM_KEY                             (-1760647376L)
#define KV5M_ENC_SAM_RESPONSE_ENC                (-1760647375L)
#define KV5M_ENC_SAM_RESPONSE_ENC_2              (-1760647374L)
#define KV5M_SAM_RESPONSE                        (-1760647373L)
#define KV5M_SAM_RESPONSE_2                      (-1760647372L)
#define KV5M_PREDICTED_SAM_RESPONSE              (-1760647371L)
#define KV5M_PASSWD_PHRASE_ELEMENT               (-1760647370L)
#define KV5M_GSS_OID                             (-1760647369L)
#define KV5M_GSS_QUEUE                           (-1760647368L)
#define KV5M_FAST_ARMORED_REQ                    (-1760647367L)
#define KV5M_FAST_REQ                            (-1760647366L)
#define KV5M_FAST_RESPONSE                       (-1760647365L)
#define KV5M_AUTHDATA_CONTEXT                    (-1760647364L)
extern const struct error_table et_kv5m_error_table;
extern void initialize_kv5m_error_table(void);

/* For compatibility with Heimdal */
extern void initialize_kv5m_error_table_r(struct et_list **list);

#define ERROR_TABLE_BASE_kv5m (-1760647424L)

/* for compatibility with older versions... */
#define init_kv5m_err_tbl initialize_kv5m_error_table
#define kv5m_err_base ERROR_TABLE_BASE_kv5m
/*
 * et-h-krb524_err.h:
 * This file is automatically generated; please do not edit it.
 */

#include <et/com_err.h>

#define KRB524_BADKEY                            (-1750206208L)
#define KRB524_BADADDR                           (-1750206207L)
#define KRB524_BADPRINC                          (-1750206206L)
#define KRB524_BADREALM                          (-1750206205L)
#define KRB524_V4ERR                             (-1750206204L)
#define KRB524_ENCFULL                           (-1750206203L)
#define KRB524_DECEMPTY                          (-1750206202L)
#define KRB524_NOTRESP                           (-1750206201L)
#define KRB524_KRB4_DISABLED                     (-1750206200L)
extern const struct error_table et_k524_error_table;
extern void initialize_k524_error_table(void);

/* For compatibility with Heimdal */
extern void initialize_k524_error_table_r(struct et_list **list);

#define ERROR_TABLE_BASE_k524 (-1750206208L)

/* for compatibility with older versions... */
#define init_k524_err_tbl initialize_k524_error_table
#define k524_err_base ERROR_TABLE_BASE_k524
/*
 * et-h-asn1_err.h:
 * This file is automatically generated; please do not edit it.
 */

#include <et/com_err.h>

#define ASN1_BAD_TIMEFORMAT                      (1859794432L)
#define ASN1_MISSING_FIELD                       (1859794433L)
#define ASN1_MISPLACED_FIELD                     (1859794434L)
#define ASN1_TYPE_MISMATCH                       (1859794435L)
#define ASN1_OVERFLOW                            (1859794436L)
#define ASN1_OVERRUN                             (1859794437L)
#define ASN1_BAD_ID                              (1859794438L)
#define ASN1_BAD_LENGTH                          (1859794439L)
#define ASN1_BAD_FORMAT                          (1859794440L)
#define ASN1_PARSE_ERROR                         (1859794441L)
#define ASN1_BAD_GMTIME                          (1859794442L)
#define ASN1_INDEF                               (1859794443L)
#define ASN1_MISSING_EOC                         (1859794444L)
#define ASN1_OMITTED                             (1859794445L)
extern const struct error_table et_asn1_error_table;
extern void initialize_asn1_error_table(void);

/* For compatibility with Heimdal */
extern void initialize_asn1_error_table_r(struct et_list **list);

#define ERROR_TABLE_BASE_asn1 (1859794432L)

/* for compatibility with older versions... */
#define init_asn1_err_tbl initialize_asn1_error_table
#define asn1_err_base ERROR_TABLE_BASE_asn1
#endif /* KRB5_KRB5_H_INCLUDED */

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Nama	Ukuran	Dimodifikasi	Permission	Aksi
📎 ccselect_plugin.h	4.1 KB	2023-07-10 20:58	0644	✏️ Edit ⬇
📎 certauth_plugin.h	5.7 KB	2023-07-10 20:58	0644	✏️ Edit ⬇
📎 clpreauth_plugin.h	15.2 KB	2023-07-10 20:58	0644	✏️ Edit ⬇
📎 hostrealm_plugin.h	5.3 KB	2023-07-10 20:58	0644	✏️ Edit ⬇
📎 kadm5_auth_plugin.h	12.2 KB	2023-07-10 20:58	0644	✏️ Edit ⬇
📎 kadm5_hook_plugin.h	6 KB	2023-07-10 20:58	0644	✏️ Edit ⬇
📎 kdcpolicy_plugin.h	5.2 KB	2023-07-10 20:58	0644	✏️ Edit ⬇
📎 kdcpreauth_plugin.h	17.8 KB	2023-07-10 20:58	0644	✏️ Edit ⬇
📎 krb5.h	343.3 KB	2026-05-20 23:47	0644	✏️ Edit ⬇
📎 localauth_plugin.h	5.7 KB	2023-07-10 20:58	0644	✏️ Edit ⬇
📎 locate_plugin.h	2.6 KB	2023-07-10 20:58	0644	✏️ Edit ⬇
📎 plugin.h	2 KB	2023-07-10 20:58	0644	✏️ Edit ⬇
📎 preauth_plugin.h	1.7 KB	2023-07-10 20:58	0644	✏️ Edit ⬇
📎 pwqual_plugin.h	4.3 KB	2023-07-10 20:58	0644	✏️ Edit ⬇

Scleral Lens Associates Inc., Philadelphia, Pa.

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WELCOME TO SCLERAL LENS ASSOCIATES, INC!!

Scleral Lens Associates, Inc.’s home base is now in the Philadelphia suburbs… but we’ve taken EyePrintPRO(TM) MOBILE! Call for details.

We are one of the few practices in the tri- state area (Southeast Pennsylvania, New Jersey and Delaware) that specializes in large diameter Oxygen Permeable Scleral lenses.

Our practice is dedicated to improving the vision and quality of life for patients with anterior surface disease and irregular corneas!

A Scleral Contact Lens is a device used to treat a number of corneal disorders. These disorders can range from corneal distortion (from a variety of causes) to severe ocular surface disease. (see INDICATIONS).

This device is a Prosthetic Replacement of the Ocular Surface Ecosystem (sometimes referred to as PROSE). It can neutralize any visual distortion and protect the tissue, (in case of severe dry eye/ocular surface disease), allowing it to heal.

The Scleral Lens/prosthetic device is clear and can vary in size. It can be anywhere from the size of a nickel, to a quarter, or even a little larger. It is made from a gas-permeable plastic that allows oxygen to reach the eye’s surface. This device will rest on the conjunctiva, the clear tissue over the sclera (the white part of the eye). This part of the eye is much less sensitive than the cornea. By resting on the conjunctiva/sclera only, this lens will vault over the distorted/damaged part of the cornea. This creates a new, smooth optical surface that protects the eye from the environment and any mechanical trauma that can be caused by blinking action.

When initially inserted these devices are filled with non preserved sterile saline. On occasion, more viscous preservative free artificial tears have been used. (Always check with your provider regarding brands). This creates a Saline reservoir of fluid (see illustration) that continuously bathes the ocular surface with oxygen and nutrients.

The yellow glow visualized is dye to demonstrate where the fluid is under the Scleral Lens/Prosthetic device

We are a certified EYEPRINT PROSTHETIC provider for customized surface irregularities

visit www.eyeprintpro.com

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_____________________________________

CALL: 267-908-LENS (5367)

Located in:

We have relocated our home base to Suburban Philadelphia …but we’ve taken EyePrintPRO(TM) MOBILE for the greater Philadelphia area! Call for details.

_____________________________________

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