lib/libalpm/sha2.h

   1 /*
   2  *  SHA-224 and SHA-256 cryptographic hash function
   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
  22  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  */
  24 #ifndef _SHA2_H
  25 #define _SHA2_H
  26
  27 #include <string.h>
  28
  29 /**
  30  * \brief          SHA-256 context structure
  31  */
  32 typedef struct
  33 {
  34     unsigned long total[2];     /*!< number of bytes processed  */
  35     unsigned long state[8];     /*!< intermediate digest state  */
  36     unsigned char buffer[64];   /*!< data block being processed */
  37
  38     int is224;                  /*!< 0 => SHA-256, else SHA-224 */
  39 }
  40 sha2_context;
  41
  42 /**
  43  * \brief          Output = SHA-256( input buffer )
  44  *
  45  * \param input    buffer holding the  data
  46  * \param ilen     length of the input data
  47  * \param output   SHA-224/256 checksum result
  48  * \param is224    0 = use SHA256, 1 = use SHA224
  49  */
  50 void sha2( const unsigned char *input, size_t ilen,
  51            unsigned char output[32], int is224 );
  52
  53 /**
  54  * \brief          Output = SHA-256( file contents )
  55  *
  56  * \param path     input file name
  57  * \param output   SHA-224/256 checksum result
  58  * \param is224    0 = use SHA256, 1 = use SHA224
  59  *
  60  * \return         0 if successful, 1 if fopen failed,
  61  *                 or 2 if fread failed
  62  */
  63 int sha2_file( const char *path, unsigned char output[32], int is224 );
  64
  65 #endif /* sha2.h */