1 /*****************************************************************************
2 * md5.c: not so strong MD5 hashing
3 *****************************************************************************
4 * Copyright (C) 2004-2005 the VideoLAN team
7 * Authors: Jon Lech Johansen <jon-vl@nanocrew.net>
8 * Sam Hocevar <sam@zoy.org>
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.
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.
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 *****************************************************************************/
31 #include <vlc_common.h>
34 #ifdef WORDS_BIGENDIAN
35 /*****************************************************************************
36 * Reverse: reverse byte order
37 *****************************************************************************/
38 static inline void Reverse( uint32_t *p_buffer, int n )
42 for( i = 0; i < n; i++ )
44 p_buffer[ i ] = GetDWLE(&p_buffer[ i ]);
47 # define REVERSE( p, n ) Reverse( p, n )
49 # define REVERSE( p, n )
52 #define F1( x, y, z ) ((z) ^ ((x) & ((y) ^ (z))))
53 #define F2( x, y, z ) F1((z), (x), (y))
54 #define F3( x, y, z ) ((x) ^ (y) ^ (z))
55 #define F4( x, y, z ) ((y) ^ ((x) | ~(z)))
57 #define MD5_DO( f, w, x, y, z, data, s ) \
58 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
60 /*****************************************************************************
61 * DigestMD5: update the MD5 digest with 64 bytes of data
62 *****************************************************************************/
63 static void DigestMD5( struct md5_s *p_md5, uint32_t *p_input )
67 REVERSE( p_input, 16 );
69 a = p_md5->p_digest[ 0 ];
70 b = p_md5->p_digest[ 1 ];
71 c = p_md5->p_digest[ 2 ];
72 d = p_md5->p_digest[ 3 ];
74 MD5_DO( F1, a, b, c, d, p_input[ 0 ] + 0xd76aa478, 7 );
75 MD5_DO( F1, d, a, b, c, p_input[ 1 ] + 0xe8c7b756, 12 );
76 MD5_DO( F1, c, d, a, b, p_input[ 2 ] + 0x242070db, 17 );
77 MD5_DO( F1, b, c, d, a, p_input[ 3 ] + 0xc1bdceee, 22 );
78 MD5_DO( F1, a, b, c, d, p_input[ 4 ] + 0xf57c0faf, 7 );
79 MD5_DO( F1, d, a, b, c, p_input[ 5 ] + 0x4787c62a, 12 );
80 MD5_DO( F1, c, d, a, b, p_input[ 6 ] + 0xa8304613, 17 );
81 MD5_DO( F1, b, c, d, a, p_input[ 7 ] + 0xfd469501, 22 );
82 MD5_DO( F1, a, b, c, d, p_input[ 8 ] + 0x698098d8, 7 );
83 MD5_DO( F1, d, a, b, c, p_input[ 9 ] + 0x8b44f7af, 12 );
84 MD5_DO( F1, c, d, a, b, p_input[ 10 ] + 0xffff5bb1, 17 );
85 MD5_DO( F1, b, c, d, a, p_input[ 11 ] + 0x895cd7be, 22 );
86 MD5_DO( F1, a, b, c, d, p_input[ 12 ] + 0x6b901122, 7 );
87 MD5_DO( F1, d, a, b, c, p_input[ 13 ] + 0xfd987193, 12 );
88 MD5_DO( F1, c, d, a, b, p_input[ 14 ] + 0xa679438e, 17 );
89 MD5_DO( F1, b, c, d, a, p_input[ 15 ] + 0x49b40821, 22 );
91 MD5_DO( F2, a, b, c, d, p_input[ 1 ] + 0xf61e2562, 5 );
92 MD5_DO( F2, d, a, b, c, p_input[ 6 ] + 0xc040b340, 9 );
93 MD5_DO( F2, c, d, a, b, p_input[ 11 ] + 0x265e5a51, 14 );
94 MD5_DO( F2, b, c, d, a, p_input[ 0 ] + 0xe9b6c7aa, 20 );
95 MD5_DO( F2, a, b, c, d, p_input[ 5 ] + 0xd62f105d, 5 );
96 MD5_DO( F2, d, a, b, c, p_input[ 10 ] + 0x02441453, 9 );
97 MD5_DO( F2, c, d, a, b, p_input[ 15 ] + 0xd8a1e681, 14 );
98 MD5_DO( F2, b, c, d, a, p_input[ 4 ] + 0xe7d3fbc8, 20 );
99 MD5_DO( F2, a, b, c, d, p_input[ 9 ] + 0x21e1cde6, 5 );
100 MD5_DO( F2, d, a, b, c, p_input[ 14 ] + 0xc33707d6, 9 );
101 MD5_DO( F2, c, d, a, b, p_input[ 3 ] + 0xf4d50d87, 14 );
102 MD5_DO( F2, b, c, d, a, p_input[ 8 ] + 0x455a14ed, 20 );
103 MD5_DO( F2, a, b, c, d, p_input[ 13 ] + 0xa9e3e905, 5 );
104 MD5_DO( F2, d, a, b, c, p_input[ 2 ] + 0xfcefa3f8, 9 );
105 MD5_DO( F2, c, d, a, b, p_input[ 7 ] + 0x676f02d9, 14 );
106 MD5_DO( F2, b, c, d, a, p_input[ 12 ] + 0x8d2a4c8a, 20 );
108 MD5_DO( F3, a, b, c, d, p_input[ 5 ] + 0xfffa3942, 4 );
109 MD5_DO( F3, d, a, b, c, p_input[ 8 ] + 0x8771f681, 11 );
110 MD5_DO( F3, c, d, a, b, p_input[ 11 ] + 0x6d9d6122, 16 );
111 MD5_DO( F3, b, c, d, a, p_input[ 14 ] + 0xfde5380c, 23 );
112 MD5_DO( F3, a, b, c, d, p_input[ 1 ] + 0xa4beea44, 4 );
113 MD5_DO( F3, d, a, b, c, p_input[ 4 ] + 0x4bdecfa9, 11 );
114 MD5_DO( F3, c, d, a, b, p_input[ 7 ] + 0xf6bb4b60, 16 );
115 MD5_DO( F3, b, c, d, a, p_input[ 10 ] + 0xbebfbc70, 23 );
116 MD5_DO( F3, a, b, c, d, p_input[ 13 ] + 0x289b7ec6, 4 );
117 MD5_DO( F3, d, a, b, c, p_input[ 0 ] + 0xeaa127fa, 11 );
118 MD5_DO( F3, c, d, a, b, p_input[ 3 ] + 0xd4ef3085, 16 );
119 MD5_DO( F3, b, c, d, a, p_input[ 6 ] + 0x04881d05, 23 );
120 MD5_DO( F3, a, b, c, d, p_input[ 9 ] + 0xd9d4d039, 4 );
121 MD5_DO( F3, d, a, b, c, p_input[ 12 ] + 0xe6db99e5, 11 );
122 MD5_DO( F3, c, d, a, b, p_input[ 15 ] + 0x1fa27cf8, 16 );
123 MD5_DO( F3, b, c, d, a, p_input[ 2 ] + 0xc4ac5665, 23 );
125 MD5_DO( F4, a, b, c, d, p_input[ 0 ] + 0xf4292244, 6 );
126 MD5_DO( F4, d, a, b, c, p_input[ 7 ] + 0x432aff97, 10 );
127 MD5_DO( F4, c, d, a, b, p_input[ 14 ] + 0xab9423a7, 15 );
128 MD5_DO( F4, b, c, d, a, p_input[ 5 ] + 0xfc93a039, 21 );
129 MD5_DO( F4, a, b, c, d, p_input[ 12 ] + 0x655b59c3, 6 );
130 MD5_DO( F4, d, a, b, c, p_input[ 3 ] + 0x8f0ccc92, 10 );
131 MD5_DO( F4, c, d, a, b, p_input[ 10 ] + 0xffeff47d, 15 );
132 MD5_DO( F4, b, c, d, a, p_input[ 1 ] + 0x85845dd1, 21 );
133 MD5_DO( F4, a, b, c, d, p_input[ 8 ] + 0x6fa87e4f, 6 );
134 MD5_DO( F4, d, a, b, c, p_input[ 15 ] + 0xfe2ce6e0, 10 );
135 MD5_DO( F4, c, d, a, b, p_input[ 6 ] + 0xa3014314, 15 );
136 MD5_DO( F4, b, c, d, a, p_input[ 13 ] + 0x4e0811a1, 21 );
137 MD5_DO( F4, a, b, c, d, p_input[ 4 ] + 0xf7537e82, 6 );
138 MD5_DO( F4, d, a, b, c, p_input[ 11 ] + 0xbd3af235, 10 );
139 MD5_DO( F4, c, d, a, b, p_input[ 2 ] + 0x2ad7d2bb, 15 );
140 MD5_DO( F4, b, c, d, a, p_input[ 9 ] + 0xeb86d391, 21 );
142 p_md5->p_digest[ 0 ] += a;
143 p_md5->p_digest[ 1 ] += b;
144 p_md5->p_digest[ 2 ] += c;
145 p_md5->p_digest[ 3 ] += d;
148 /*****************************************************************************
149 * InitMD5: initialise an MD5 message
150 *****************************************************************************
151 * The MD5 message-digest algorithm is described in RFC 1321
152 *****************************************************************************/
153 void InitMD5( struct md5_s *p_md5 )
155 p_md5->p_digest[ 0 ] = 0x67452301;
156 p_md5->p_digest[ 1 ] = 0xefcdab89;
157 p_md5->p_digest[ 2 ] = 0x98badcfe;
158 p_md5->p_digest[ 3 ] = 0x10325476;
160 memset( p_md5->p_data, 0, 64 );
164 /*****************************************************************************
165 * AddMD5: add i_len bytes to an MD5 message
166 *****************************************************************************/
167 void AddMD5( struct md5_s *p_md5, const void *p_src, size_t i_len )
169 unsigned int i_current; /* Current bytes in the spare buffer */
172 i_current = (p_md5->i_bits / 8) & 63;
174 p_md5->i_bits += 8 * i_len;
176 /* If we can complete our spare buffer to 64 bytes, do it and add the
177 * resulting buffer to the MD5 message */
178 if( i_len >= (64 - i_current) )
180 memcpy( ((uint8_t *)p_md5->p_data) + i_current, p_src,
182 DigestMD5( p_md5, p_md5->p_data );
184 i_offset += (64 - i_current);
185 i_len -= (64 - i_current);
189 /* Add as many entire 64 bytes blocks as we can to the MD5 message */
192 uint32_t p_tmp[ 16 ];
193 memcpy( p_tmp, ((const uint8_t *)p_src) + i_offset, 64 );
194 DigestMD5( p_md5, p_tmp );
199 /* Copy our remaining data to the message's spare buffer */
200 memcpy( ((uint8_t *)p_md5->p_data) + i_current,
201 ((const uint8_t *)p_src) + i_offset, i_len );
204 /*****************************************************************************
205 * EndMD5: finish an MD5 message
206 *****************************************************************************
207 * This function adds adequate padding to the end of the message, and appends
208 * the bit count so that we end at a block boundary.
209 *****************************************************************************/
210 void EndMD5( struct md5_s *p_md5 )
212 unsigned int i_current;
214 i_current = (p_md5->i_bits / 8) & 63;
216 /* Append 0x80 to our buffer. No boundary check because the temporary
217 * buffer cannot be full, otherwise AddMD5 would have emptied it. */
218 ((uint8_t *)p_md5->p_data)[ i_current++ ] = 0x80;
220 /* If less than 8 bytes are available at the end of the block, complete
221 * this 64 bytes block with zeros and add it to the message. We'll add
222 * our length at the end of the next block. */
225 memset( ((uint8_t *)p_md5->p_data) + i_current, 0, (64 - i_current) );
226 DigestMD5( p_md5, p_md5->p_data );
230 /* Fill the unused space in our last block with zeroes and put the
231 * message length at the end. */
232 memset( ((uint8_t *)p_md5->p_data) + i_current, 0, (56 - i_current) );
233 p_md5->p_data[ 14 ] = p_md5->i_bits & 0xffffffff;
234 p_md5->p_data[ 15 ] = (p_md5->i_bits >> 32);
235 REVERSE( &p_md5->p_data[ 14 ], 2 );
237 DigestMD5( p_md5, p_md5->p_data );