src/src/pdkim/polarssl/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 #ifndef POLARSSL_SHA2_H
  26 #define POLARSSL_SHA2_H
  27
  28 /**
  29  * \brief          SHA-256 context structure
  30  */
  31 #ifndef HAVE_SHA2_CONTEXT
  32 #define HAVE_SHA2_CONTEXT
  33 typedef struct sha2_context sha2_context;
  34 #endif
  35
  36 struct sha2_context
  37 {
  38     unsigned long total[2];     /*!< number of bytes processed  */
  39     unsigned long state[8];     /*!< intermediate digest state  */
  40     unsigned char buffer[64];   /*!< data block being processed */
  41
  42     unsigned char ipad[64];     /*!< HMAC: inner padding        */
  43     unsigned char opad[64];     /*!< HMAC: outer padding        */
  44     int is224;                  /*!< 0 => SHA-256, else SHA-224 */
  45 };
  46
  47 #ifdef __cplusplus
  48 extern "C" {
  49 #endif
  50
  51 /**
  52  * \brief          SHA-256 context setup
  53  *
  54  * \param ctx      context to be initialized
  55  * \param is224    0 = use SHA256, 1 = use SHA224
  56  */
  57 void sha2_starts( sha2_context *ctx, int is224 );
  58
  59 /**
  60  * \brief          SHA-256 process buffer
  61  *
  62  * \param ctx      SHA-256 context
  63  * \param input    buffer holding the  data
  64  * \param ilen     length of the input data
  65  */
  66 void sha2_update( sha2_context *ctx, const unsigned char *input, int ilen );
  67
  68 /**
  69  * \brief          SHA-256 final digest
  70  *
  71  * \param ctx      SHA-256 context
  72  * \param output   SHA-224/256 checksum result
  73  */
  74 void sha2_finish( sha2_context *ctx, unsigned char output[32] );
  75
  76 /**
  77  * \brief          Output = SHA-256( input buffer )
  78  *
  79  * \param input    buffer holding the  data
  80  * \param ilen     length of the input data
  81  * \param output   SHA-224/256 checksum result
  82  * \param is224    0 = use SHA256, 1 = use SHA224
  83  */
  84 void sha2( const unsigned char *input, int ilen,
  85            unsigned char output[32], int is224 );
  86
  87 /**
  88  * \brief          Output = SHA-256( file contents )
  89  *
  90  * \param path     input file name
  91  * \param output   SHA-224/256 checksum result
  92  * \param is224    0 = use SHA256, 1 = use SHA224
  93  *
  94  * \return         0 if successful, 1 if fopen failed,
  95  *                 or 2 if fread failed
  96  */
  97 int sha2_file( const char *path, unsigned char output[32], int is224 );
  98
  99 /**
 100  * \brief          SHA-256 HMAC context setup
 101  *
 102  * \param ctx      HMAC context to be initialized
 103  * \param key      HMAC secret key
 104  * \param keylen   length of the HMAC key
 105  * \param is224    0 = use SHA256, 1 = use SHA224
 106  */
 107 void sha2_hmac_starts( sha2_context *ctx, const unsigned char *key, int keylen,
 108                        int is224 );
 109
 110 /**
 111  * \brief          SHA-256 HMAC process buffer
 112  *
 113  * \param ctx      HMAC context
 114  * \param input    buffer holding the  data
 115  * \param ilen     length of the input data
 116  */
 117 void sha2_hmac_update( sha2_context *ctx, const unsigned char *input, int ilen );
 118
 119 /**
 120  * \brief          SHA-256 HMAC final digest
 121  *
 122  * \param ctx      HMAC context
 123  * \param output   SHA-224/256 HMAC checksum result
 124  */
 125 void sha2_hmac_finish( sha2_context *ctx, unsigned char output[32] );
 126
 127 /**
 128  * \brief          SHA-256 HMAC context reset
 129  *
 130  * \param ctx      HMAC context to be reset
 131  */
 132 void sha2_hmac_reset( sha2_context *ctx );
 133
 134 /**
 135  * \brief          Output = HMAC-SHA-256( hmac key, input buffer )
 136  *
 137  * \param key      HMAC secret key
 138  * \param keylen   length of the HMAC key
 139  * \param input    buffer holding the  data
 140  * \param ilen     length of the input data
 141  * \param output   HMAC-SHA-224/256 result
 142  * \param is224    0 = use SHA256, 1 = use SHA224
 143  */
 144 void sha2_hmac( const unsigned char *key, int keylen,
 145                 const unsigned char *input, int ilen,
 146                 unsigned char output[32], int is224 );
 147
 148 /**
 149  * \brief          Checkup routine
 150  *
 151  * \return         0 if successful, or 1 if the test failed
 152  */
 153 int sha2_self_test( int verbose );
 154
 155 #ifdef __cplusplus
 156 }
 157 #endif
 158
 159 #endif /* sha2.h */