2 * Copyright (C) 2006 Michael Niedermayer (michaelni@gmx.at)
3 * Copyright (C) 2003-2005 by Christopher R. Hertel (crh@ubiqx.mn.org)
6 * IETF RFC 1321: The MD5 Message-Digest Algorithm
7 * Ron Rivest. IETF, April, 1992
9 * based on http://ubiqx.org/libcifs/source/Auth/MD5.c
10 * from Christopher R. Hertel (crh@ubiqx.mn.org)
11 * Simplified, cleaned and IMO redundant comments removed by michael.
13 * If you use gcc, then version 4.1 or later and -fomit-frame-pointer is
14 * strongly recommended.
16 * This file is part of FFmpeg.
18 * FFmpeg is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU Lesser General Public
20 * License as published by the Free Software Foundation; either
21 * version 2.1 of the License, or (at your option) any later version.
23 * FFmpeg is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26 * Lesser General Public License for more details.
28 * You should have received a copy of the GNU Lesser General Public
29 * License along with FFmpeg; if not, write to the Free Software
30 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
35 #include "intreadwrite.h"
45 const int av_md5_size = sizeof(AVMD5);
47 struct AVMD5 *av_md5_alloc(void)
49 return av_mallocz(sizeof(struct AVMD5));
52 static const uint8_t S[4][4] = {
53 { 7, 12, 17, 22 }, /* round 1 */
54 { 5, 9, 14, 20 }, /* round 2 */
55 { 4, 11, 16, 23 }, /* round 3 */
56 { 6, 10, 15, 21 } /* round 4 */
59 static const uint32_t T[64] = { // T[i]= fabs(sin(i+1)<<32)
60 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, /* round 1 */
61 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
62 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
63 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
65 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, /* round 2 */
66 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
67 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
68 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
70 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, /* round 3 */
71 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
72 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
73 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
75 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, /* round 4 */
76 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
77 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
78 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
81 #define CORE(i, a, b, c, d) do { \
82 t = S[i >> 4][i & 3]; \
86 if (i < 16) a += (d ^ (b & (c ^ d))) + X[ i & 15]; \
87 else a += ((d & b) | (~d & c))+ X[(1 + 5*i) & 15]; \
89 if (i < 48) a += (b ^ c ^ d) + X[(5 + 3*i) & 15]; \
90 else a += (c ^ (b | ~d)) + X[( 7*i) & 15]; \
92 a = b + (a << t | a >> (32 - t)); \
95 static void body(uint32_t ABCD[4], uint32_t *src, int nblocks)
99 uint32_t a, b, c, d, t, *X;
101 for (n = 0; n < nblocks; n++) {
110 for (i = 0; i < 16; i++)
111 X[i] = av_bswap32(X[i]);
115 for (i = 0; i < 64; i++) {
125 CORE( i, a,b,c,d); CORE((i+1),d,a,b,c); \
126 CORE((i+2),c,d,a,b); CORE((i+3),b,c,d,a)
127 #define CORE4(i) CORE2(i); CORE2((i+4)); CORE2((i+8)); CORE2((i+12))
128 CORE4(0); CORE4(16); CORE4(32); CORE4(48);
138 void av_md5_init(AVMD5 *ctx)
142 ctx->ABCD[0] = 0x10325476;
143 ctx->ABCD[1] = 0x98badcfe;
144 ctx->ABCD[2] = 0xefcdab89;
145 ctx->ABCD[3] = 0x67452301;
148 void av_md5_update(AVMD5 *ctx, const uint8_t *src, int len)
157 int cnt = FFMIN(len, 64 - j);
158 memcpy(ctx->block + j, src, cnt);
163 body(ctx->ABCD, (uint32_t *)ctx->block, 1);
166 end = src + (len & ~63);
167 if (HAVE_BIGENDIAN || (!HAVE_FAST_UNALIGNED && ((intptr_t)src & 3))) {
169 memcpy(ctx->block, src, 64);
170 body(ctx->ABCD, (uint32_t *) ctx->block, 1);
174 int nblocks = len / 64;
175 body(ctx->ABCD, (uint32_t *)src, nblocks);
180 memcpy(ctx->block, src, len);
183 void av_md5_final(AVMD5 *ctx, uint8_t *dst)
186 uint64_t finalcount = av_le2ne64(ctx->len << 3);
188 av_md5_update(ctx, "\200", 1);
189 while ((ctx->len & 63) != 56)
190 av_md5_update(ctx, "", 1);
192 av_md5_update(ctx, (uint8_t *)&finalcount, 8);
194 for (i = 0; i < 4; i++)
195 AV_WL32(dst + 4*i, ctx->ABCD[3 - i]);
198 void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len)
203 av_md5_update(&ctx, src, len);
204 av_md5_final(&ctx, dst);
210 static void print_md5(uint8_t *md5)
213 for (i = 0; i < 16; i++)
214 printf("%02x", md5[i]);
223 for (i = 0; i < 1000; i++)
225 av_md5_sum(md5val, in, 1000); print_md5(md5val);
226 av_md5_sum(md5val, in, 63); print_md5(md5val);
227 av_md5_sum(md5val, in, 64); print_md5(md5val);
228 av_md5_sum(md5val, in, 65); print_md5(md5val);
229 for (i = 0; i < 1000; i++)
231 av_md5_sum(md5val, in, 999); print_md5(md5val);