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