src/misc/md5.c

   1 /*****************************************************************************
   2  * md5.c: not so strong MD5 hashing
   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 #include <string.h>
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #include <vlc_common.h>
  31 #include <vlc_md5.h>
  32
  33 #ifdef WORDS_BIGENDIAN
  34 /*****************************************************************************
  35  * Reverse: reverse byte order
  36  *****************************************************************************/
  37 static inline void Reverse( uint32_t *p_buffer, int n )
  38 {
  39     int i;
  40
  41     for( i = 0; i < n; i++ )
  42     {
  43         p_buffer[ i ] = GetDWLE(&p_buffer[ i ]);
  44     }
  45 }
  46 #    define REVERSE( p, n ) Reverse( p, n )
  47 #else
  48 #    define REVERSE( p, n )
  49 #endif
  50
  51 #define F1( x, y, z ) ((z) ^ ((x) & ((y) ^ (z))))
  52 #define F2( x, y, z ) F1((z), (x), (y))
  53 #define F3( x, y, z ) ((x) ^ (y) ^ (z))
  54 #define F4( x, y, z ) ((y) ^ ((x) | ~(z)))
  55
  56 #define MD5_DO( f, w, x, y, z, data, s ) \
  57     ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
  58
  59 /*****************************************************************************
  60  * DigestMD5: update the MD5 digest with 64 bytes of data
  61  *****************************************************************************/
  62 static void DigestMD5( struct md5_s *p_md5, uint32_t *p_input )
  63 {
  64     uint32_t a, b, c, d;
  65
  66     REVERSE( p_input, 16 );
  67
  68     a = p_md5->p_digest[ 0 ];
  69     b = p_md5->p_digest[ 1 ];
  70     c = p_md5->p_digest[ 2 ];
  71     d = p_md5->p_digest[ 3 ];
  72
  73     MD5_DO( F1, a, b, c, d, p_input[  0 ] + 0xd76aa478,  7 );
  74     MD5_DO( F1, d, a, b, c, p_input[  1 ] + 0xe8c7b756, 12 );
  75     MD5_DO( F1, c, d, a, b, p_input[  2 ] + 0x242070db, 17 );
  76     MD5_DO( F1, b, c, d, a, p_input[  3 ] + 0xc1bdceee, 22 );
  77     MD5_DO( F1, a, b, c, d, p_input[  4 ] + 0xf57c0faf,  7 );
  78     MD5_DO( F1, d, a, b, c, p_input[  5 ] + 0x4787c62a, 12 );
  79     MD5_DO( F1, c, d, a, b, p_input[  6 ] + 0xa8304613, 17 );
  80     MD5_DO( F1, b, c, d, a, p_input[  7 ] + 0xfd469501, 22 );
  81     MD5_DO( F1, a, b, c, d, p_input[  8 ] + 0x698098d8,  7 );
  82     MD5_DO( F1, d, a, b, c, p_input[  9 ] + 0x8b44f7af, 12 );
  83     MD5_DO( F1, c, d, a, b, p_input[ 10 ] + 0xffff5bb1, 17 );
  84     MD5_DO( F1, b, c, d, a, p_input[ 11 ] + 0x895cd7be, 22 );
  85     MD5_DO( F1, a, b, c, d, p_input[ 12 ] + 0x6b901122,  7 );
  86     MD5_DO( F1, d, a, b, c, p_input[ 13 ] + 0xfd987193, 12 );
  87     MD5_DO( F1, c, d, a, b, p_input[ 14 ] + 0xa679438e, 17 );
  88     MD5_DO( F1, b, c, d, a, p_input[ 15 ] + 0x49b40821, 22 );
  89
  90     MD5_DO( F2, a, b, c, d, p_input[  1 ] + 0xf61e2562,  5 );
  91     MD5_DO( F2, d, a, b, c, p_input[  6 ] + 0xc040b340,  9 );
  92     MD5_DO( F2, c, d, a, b, p_input[ 11 ] + 0x265e5a51, 14 );
  93     MD5_DO( F2, b, c, d, a, p_input[  0 ] + 0xe9b6c7aa, 20 );
  94     MD5_DO( F2, a, b, c, d, p_input[  5 ] + 0xd62f105d,  5 );
  95     MD5_DO( F2, d, a, b, c, p_input[ 10 ] + 0x02441453,  9 );
  96     MD5_DO( F2, c, d, a, b, p_input[ 15 ] + 0xd8a1e681, 14 );
  97     MD5_DO( F2, b, c, d, a, p_input[  4 ] + 0xe7d3fbc8, 20 );
  98     MD5_DO( F2, a, b, c, d, p_input[  9 ] + 0x21e1cde6,  5 );
  99     MD5_DO( F2, d, a, b, c, p_input[ 14 ] + 0xc33707d6,  9 );
 100     MD5_DO( F2, c, d, a, b, p_input[  3 ] + 0xf4d50d87, 14 );
 101     MD5_DO( F2, b, c, d, a, p_input[  8 ] + 0x455a14ed, 20 );
 102     MD5_DO( F2, a, b, c, d, p_input[ 13 ] + 0xa9e3e905,  5 );
 103     MD5_DO( F2, d, a, b, c, p_input[  2 ] + 0xfcefa3f8,  9 );
 104     MD5_DO( F2, c, d, a, b, p_input[  7 ] + 0x676f02d9, 14 );
 105     MD5_DO( F2, b, c, d, a, p_input[ 12 ] + 0x8d2a4c8a, 20 );
 106
 107     MD5_DO( F3, a, b, c, d, p_input[  5 ] + 0xfffa3942,  4 );
 108     MD5_DO( F3, d, a, b, c, p_input[  8 ] + 0x8771f681, 11 );
 109     MD5_DO( F3, c, d, a, b, p_input[ 11 ] + 0x6d9d6122, 16 );
 110     MD5_DO( F3, b, c, d, a, p_input[ 14 ] + 0xfde5380c, 23 );
 111     MD5_DO( F3, a, b, c, d, p_input[  1 ] + 0xa4beea44,  4 );
 112     MD5_DO( F3, d, a, b, c, p_input[  4 ] + 0x4bdecfa9, 11 );
 113     MD5_DO( F3, c, d, a, b, p_input[  7 ] + 0xf6bb4b60, 16 );
 114     MD5_DO( F3, b, c, d, a, p_input[ 10 ] + 0xbebfbc70, 23 );
 115     MD5_DO( F3, a, b, c, d, p_input[ 13 ] + 0x289b7ec6,  4 );
 116     MD5_DO( F3, d, a, b, c, p_input[  0 ] + 0xeaa127fa, 11 );
 117     MD5_DO( F3, c, d, a, b, p_input[  3 ] + 0xd4ef3085, 16 );
 118     MD5_DO( F3, b, c, d, a, p_input[  6 ] + 0x04881d05, 23 );
 119     MD5_DO( F3, a, b, c, d, p_input[  9 ] + 0xd9d4d039,  4 );
 120     MD5_DO( F3, d, a, b, c, p_input[ 12 ] + 0xe6db99e5, 11 );
 121     MD5_DO( F3, c, d, a, b, p_input[ 15 ] + 0x1fa27cf8, 16 );
 122     MD5_DO( F3, b, c, d, a, p_input[  2 ] + 0xc4ac5665, 23 );
 123
 124     MD5_DO( F4, a, b, c, d, p_input[  0 ] + 0xf4292244,  6 );
 125     MD5_DO( F4, d, a, b, c, p_input[  7 ] + 0x432aff97, 10 );
 126     MD5_DO( F4, c, d, a, b, p_input[ 14 ] + 0xab9423a7, 15 );
 127     MD5_DO( F4, b, c, d, a, p_input[  5 ] + 0xfc93a039, 21 );
 128     MD5_DO( F4, a, b, c, d, p_input[ 12 ] + 0x655b59c3,  6 );
 129     MD5_DO( F4, d, a, b, c, p_input[  3 ] + 0x8f0ccc92, 10 );
 130     MD5_DO( F4, c, d, a, b, p_input[ 10 ] + 0xffeff47d, 15 );
 131     MD5_DO( F4, b, c, d, a, p_input[  1 ] + 0x85845dd1, 21 );
 132     MD5_DO( F4, a, b, c, d, p_input[  8 ] + 0x6fa87e4f,  6 );
 133     MD5_DO( F4, d, a, b, c, p_input[ 15 ] + 0xfe2ce6e0, 10 );
 134     MD5_DO( F4, c, d, a, b, p_input[  6 ] + 0xa3014314, 15 );
 135     MD5_DO( F4, b, c, d, a, p_input[ 13 ] + 0x4e0811a1, 21 );
 136     MD5_DO( F4, a, b, c, d, p_input[  4 ] + 0xf7537e82,  6 );
 137     MD5_DO( F4, d, a, b, c, p_input[ 11 ] + 0xbd3af235, 10 );
 138     MD5_DO( F4, c, d, a, b, p_input[  2 ] + 0x2ad7d2bb, 15 );
 139     MD5_DO( F4, b, c, d, a, p_input[  9 ] + 0xeb86d391, 21 );
 140
 141     p_md5->p_digest[ 0 ] += a;
 142     p_md5->p_digest[ 1 ] += b;
 143     p_md5->p_digest[ 2 ] += c;
 144     p_md5->p_digest[ 3 ] += d;
 145 }
 146
 147 /*****************************************************************************
 148  * InitMD5: initialise an MD5 message
 149  *****************************************************************************
 150  * The MD5 message-digest algorithm is described in RFC 1321
 151  *****************************************************************************/
 152 void InitMD5( struct md5_s *p_md5 )
 153 {
 154     p_md5->p_digest[ 0 ] = 0x67452301;
 155     p_md5->p_digest[ 1 ] = 0xefcdab89;
 156     p_md5->p_digest[ 2 ] = 0x98badcfe;
 157     p_md5->p_digest[ 3 ] = 0x10325476;
 158
 159     memset( p_md5->p_data, 0, 64 );
 160     p_md5->i_bits = 0;
 161 }
 162
 163 /*****************************************************************************
 164  * AddMD5: add i_len bytes to an MD5 message
 165  *****************************************************************************/
 166 void AddMD5( struct md5_s *p_md5, const void *p_src, size_t i_len )
 167 {
 168     unsigned int i_current; /* Current bytes in the spare buffer */
 169     size_t i_offset = 0;
 170
 171     i_current = (p_md5->i_bits / 8) & 63;
 172
 173     p_md5->i_bits += 8 * i_len;
 174
 175     /* If we can complete our spare buffer to 64 bytes, do it and add the
 176      * resulting buffer to the MD5 message */
 177     if( i_len >= (64 - i_current) )
 178     {
 179         memcpy( ((uint8_t *)p_md5->p_data) + i_current, p_src,
 180                 (64 - i_current) );
 181         DigestMD5( p_md5, p_md5->p_data );
 182
 183         i_offset += (64 - i_current);
 184         i_len -= (64 - i_current);
 185         i_current = 0;
 186     }
 187
 188     /* Add as many entire 64 bytes blocks as we can to the MD5 message */
 189     while( i_len >= 64 )
 190     {
 191         uint32_t p_tmp[ 16 ];
 192         memcpy( p_tmp, ((const uint8_t *)p_src) + i_offset, 64 );
 193         DigestMD5( p_md5, p_tmp );
 194         i_offset += 64;
 195         i_len -= 64;
 196     }
 197
 198     /* Copy our remaining data to the message's spare buffer */
 199     memcpy( ((uint8_t *)p_md5->p_data) + i_current,
 200             ((const uint8_t *)p_src) + i_offset, i_len );
 201 }
 202
 203 /*****************************************************************************
 204  * EndMD5: finish an MD5 message
 205  *****************************************************************************
 206  * This function adds adequate padding to the end of the message, and appends
 207  * the bit count so that we end at a block boundary.
 208  *****************************************************************************/
 209 void EndMD5( struct md5_s *p_md5 )
 210 {
 211     unsigned int i_current;
 212
 213     i_current = (p_md5->i_bits / 8) & 63;
 214
 215     /* Append 0x80 to our buffer. No boundary check because the temporary
 216      * buffer cannot be full, otherwise AddMD5 would have emptied it. */
 217     ((uint8_t *)p_md5->p_data)[ i_current++ ] = 0x80;
 218
 219     /* If less than 8 bytes are available at the end of the block, complete
 220      * this 64 bytes block with zeros and add it to the message. We'll add
 221      * our length at the end of the next block. */
 222     if( i_current > 56 )
 223     {
 224         memset( ((uint8_t *)p_md5->p_data) + i_current, 0, (64 - i_current) );
 225         DigestMD5( p_md5, p_md5->p_data );
 226         i_current = 0;
 227     }
 228
 229     /* Fill the unused space in our last block with zeroes and put the
 230      * message length at the end. */
 231     memset( ((uint8_t *)p_md5->p_data) + i_current, 0, (56 - i_current) );
 232     p_md5->p_data[ 14 ] = p_md5->i_bits & 0xffffffff;
 233     p_md5->p_data[ 15 ] = (p_md5->i_bits >> 32);
 234     REVERSE( &p_md5->p_data[ 14 ], 2 );
 235
 236     DigestMD5( p_md5, p_md5->p_data );
 237 }
 238
 239