include/vlc_md5.h

   1 /*****************************************************************************
   2  * vlc_md5.h: MD5 hash
   3  *****************************************************************************
   4  * Copyright (C) 2004-2005 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Jon Lech Johansen <jon-vl@nanocrew.net>
   8  *          Sam Hocevar <sam@zoy.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 #ifndef _VLC_MD5_H
  26 # define _VLC_MD5_H
  27
  28 /*****************************************************************************
  29  * md5_s: MD5 message structure
  30  *****************************************************************************
  31  * This structure stores the static information needed to compute an MD5
  32  * hash. It has an extra data buffer to allow non-aligned writes.
  33  *****************************************************************************/
  34 struct md5_s
  35 {
  36     uint64_t i_bits;      /* Total written bits */
  37     uint32_t p_digest[4]; /* The MD5 digest */
  38     uint32_t p_data[16];  /* Buffer to cache non-aligned writes */
  39 };
  40
  41 VLC_EXPORT(void, InitMD5, ( struct md5_s * ) );
  42 VLC_EXPORT(void, AddMD5, ( struct md5_s *, const void *, size_t ) );
  43 VLC_EXPORT(void, EndMD5, ( struct md5_s * ) );
  44
  45 /**
  46  * Returns a char representation of the md5 hash, as shown by UNIX md5 or
  47  * md5sum tools.
  48  */
  49 static inline char * psz_md5_hash( struct md5_s *md5_s )
  50 {
  51     char *psz = malloc( 33 ); /* md5 string is 32 bytes + NULL character */
  52     if( !psz ) return NULL;
  53
  54     int i;
  55     for ( i = 0; i < 4; i++ )
  56     {
  57         sprintf( &psz[8*i], "%02x%02x%02x%02x",
  58             md5_s->p_digest[i] & 0xff,
  59             ( md5_s->p_digest[i] >> 8 ) & 0xff,
  60             ( md5_s->p_digest[i] >> 16 ) & 0xff,
  61             md5_s->p_digest[i] >> 24
  62         );
  63     }
  64     psz[32] = '\0';
  65
  66     return psz;
  67 }
  68
  69 #endif