src/src/pdkim/sha2.h

   1 /**
   2  * \file sha2.h
   3  *
   4  *  Copyright (C) 2006-2010, Brainspark B.V.
   5  *
   6  *  This file is part of PolarSSL (http://www.polarssl.org)
   7  *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
   8  *
   9  *  All rights reserved.
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with this program; if not, write to the Free Software Foundation, Inc.,
  23  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 /* $Cambridge: exim/src/src/pdkim/sha2.h,v 1.3 2009/12/07 13:05:07 tom Exp $ */
  27
  28 #ifndef POLARSSL_SHA2_H
  29 #define POLARSSL_SHA2_H
  30
  31 /**
  32  * \brief          SHA-256 context structure
  33  */
  34 #ifndef HAVE_SHA2_CONTEXT
  35 #define HAVE_SHA2_CONTEXT
  36 typedef struct sha2_context sha2_context;
  37 #endif
  38
  39 struct sha2_context
  40 {
  41     unsigned long total[2];     /*!< number of bytes processed  */
  42     unsigned long state[8];     /*!< intermediate digest state  */
  43     unsigned char buffer[64];   /*!< data block being processed */
  44
  45     unsigned char ipad[64];     /*!< HMAC: inner padding        */
  46     unsigned char opad[64];     /*!< HMAC: outer padding        */
  47     int is224;                  /*!< 0 => SHA-256, else SHA-224 */
  48 };
  49
  50 #ifdef __cplusplus
  51 extern "C" {
  52 #endif
  53
  54 /**
  55  * \brief          SHA-256 context setup
  56  *
  57  * \param ctx      context to be initialized
  58  * \param is224    0 = use SHA256, 1 = use SHA224
  59  */
  60 void sha2_starts( sha2_context *ctx, int is224 );
  61
  62 /**
  63  * \brief          SHA-256 process buffer
  64  *
  65  * \param ctx      SHA-256 context
  66  * \param input    buffer holding the  data
  67  * \param ilen     length of the input data
  68  */
  69 void sha2_update( sha2_context *ctx, const unsigned char *input, int ilen );
  70
  71 /**
  72  * \brief          SHA-256 final digest
  73  *
  74  * \param ctx      SHA-256 context
  75  * \param output   SHA-224/256 checksum result
  76  */
  77 void sha2_finish( sha2_context *ctx, unsigned char output[32] );
  78
  79 /**
  80  * \brief          Output = SHA-256( input buffer )
  81  *
  82  * \param input    buffer holding the  data
  83  * \param ilen     length of the input data
  84  * \param output   SHA-224/256 checksum result
  85  * \param is224    0 = use SHA256, 1 = use SHA224
  86  */
  87 void sha2( const unsigned char *input, int ilen,
  88            unsigned char output[32], int is224 );
  89
  90 /**
  91  * \brief          Output = SHA-256( file contents )
  92  *
  93  * \param path     input file name
  94  * \param output   SHA-224/256 checksum result
  95  * \param is224    0 = use SHA256, 1 = use SHA224
  96  *
  97  * \return         0 if successful, 1 if fopen failed,
  98  *                 or 2 if fread failed
  99  */
 100 int sha2_file( const char *path, unsigned char output[32], int is224 );
 101
 102 /**
 103  * \brief          SHA-256 HMAC context setup
 104  *
 105  * \param ctx      HMAC context to be initialized
 106  * \param key      HMAC secret key
 107  * \param keylen   length of the HMAC key
 108  * \param is224    0 = use SHA256, 1 = use SHA224
 109  */
 110 void sha2_hmac_starts( sha2_context *ctx, const unsigned char *key, int keylen,
 111                        int is224 );
 112
 113 /**
 114  * \brief          SHA-256 HMAC process buffer
 115  *
 116  * \param ctx      HMAC context
 117  * \param input    buffer holding the  data
 118  * \param ilen     length of the input data
 119  */
 120 void sha2_hmac_update( sha2_context *ctx, const unsigned char *input, int ilen );
 121
 122 /**
 123  * \brief          SHA-256 HMAC final digest
 124  *
 125  * \param ctx      HMAC context
 126  * \param output   SHA-224/256 HMAC checksum result
 127  */
 128 void sha2_hmac_finish( sha2_context *ctx, unsigned char output[32] );
 129
 130 /**
 131  * \brief          SHA-256 HMAC context reset
 132  *
 133  * \param ctx      HMAC context to be reset
 134  */
 135 void sha2_hmac_reset( sha2_context *ctx );
 136
 137 /**
 138  * \brief          Output = HMAC-SHA-256( hmac key, input buffer )
 139  *
 140  * \param key      HMAC secret key
 141  * \param keylen   length of the HMAC key
 142  * \param input    buffer holding the  data
 143  * \param ilen     length of the input data
 144  * \param output   HMAC-SHA-224/256 result
 145  * \param is224    0 = use SHA256, 1 = use SHA224
 146  */
 147 void sha2_hmac( const unsigned char *key, int keylen,
 148                 const unsigned char *input, int ilen,
 149                 unsigned char output[32], int is224 );
 150
 151 #ifdef __cplusplus
 152 }
 153 #endif
 154
 155 #endif /* sha2.h */