blob: 1069ef1efe0f03d09f46c1c360442a9479360371
| 1 | /* |
| 2 | * Copyright (C) 2006 Michael Niedermayer (michaelni@gmx.at) |
| 3 | * Copyright (C) 2003-2005 by Christopher R. Hertel (crh@ubiqx.mn.org) |
| 4 | * |
| 5 | * References: |
| 6 | * IETF RFC 1321: The MD5 Message-Digest Algorithm |
| 7 | * Ron Rivest. IETF, April, 1992 |
| 8 | * |
| 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. |
| 12 | * |
| 13 | * If you use gcc, then version 4.1 or later and -fomit-frame-pointer is |
| 14 | * strongly recommended. |
| 15 | * |
| 16 | * This file is part of FFmpeg. |
| 17 | * |
| 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. |
| 22 | * |
| 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. |
| 27 | * |
| 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 |
| 31 | */ |
| 32 | |
| 33 | #include <stdint.h> |
| 34 | |
| 35 | #include "bswap.h" |
| 36 | #include "intreadwrite.h" |
| 37 | #include "mem.h" |
| 38 | #include "md5.h" |
| 39 | |
| 40 | typedef struct AVMD5 { |
| 41 | uint64_t len; |
| 42 | uint8_t block[64]; |
| 43 | uint32_t ABCD[4]; |
| 44 | } AVMD5; |
| 45 | |
| 46 | const int av_md5_size = sizeof(AVMD5); |
| 47 | |
| 48 | struct AVMD5 *av_md5_alloc(void) |
| 49 | { |
| 50 | return av_mallocz(sizeof(struct AVMD5)); |
| 51 | } |
| 52 | |
| 53 | static const uint8_t S[4][4] = { |
| 54 | { 7, 12, 17, 22 }, /* round 1 */ |
| 55 | { 5, 9, 14, 20 }, /* round 2 */ |
| 56 | { 4, 11, 16, 23 }, /* round 3 */ |
| 57 | { 6, 10, 15, 21 } /* round 4 */ |
| 58 | }; |
| 59 | |
| 60 | static const uint32_t T[64] = { // T[i]= fabs(sin(i+1)<<32) |
| 61 | 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, /* round 1 */ |
| 62 | 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, |
| 63 | 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, |
| 64 | 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, |
| 65 | |
| 66 | 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, /* round 2 */ |
| 67 | 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, |
| 68 | 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, |
| 69 | 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, |
| 70 | |
| 71 | 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, /* round 3 */ |
| 72 | 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, |
| 73 | 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, |
| 74 | 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, |
| 75 | |
| 76 | 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, /* round 4 */ |
| 77 | 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, |
| 78 | 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, |
| 79 | 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391, |
| 80 | }; |
| 81 | |
| 82 | #define CORE(i, a, b, c, d) \ |
| 83 | do { \ |
| 84 | t = S[i >> 4][i & 3]; \ |
| 85 | a += T[i]; \ |
| 86 | \ |
| 87 | if (i < 32) { \ |
| 88 | if (i < 16) \ |
| 89 | a += (d ^ (b & (c ^ d))) + AV_RL32(X+( i & 15));\ |
| 90 | else \ |
| 91 | a += ((d & b) | (~d & c)) + AV_RL32(X+((1 + 5*i) & 15));\ |
| 92 | } else { \ |
| 93 | if (i < 48) \ |
| 94 | a += (b ^ c ^ d) + AV_RL32(X+((5 + 3*i) & 15));\ |
| 95 | else \ |
| 96 | a += (c ^ (b | ~d)) + AV_RL32(X+(( 7*i) & 15));\ |
| 97 | } \ |
| 98 | a = b + (a << t | a >> (32 - t)); \ |
| 99 | } while (0) |
| 100 | |
| 101 | static void body(uint32_t ABCD[4], const uint8_t *src, int nblocks) |
| 102 | { |
| 103 | int i av_unused; |
| 104 | int n; |
| 105 | const uint32_t *X; |
| 106 | uint32_t a, b, c, d, t; |
| 107 | |
| 108 | for (n = 0; n < nblocks; n++) { |
| 109 | a = ABCD[3]; |
| 110 | b = ABCD[2]; |
| 111 | c = ABCD[1]; |
| 112 | d = ABCD[0]; |
| 113 | |
| 114 | X = (const uint32_t *)src + n * 16; |
| 115 | |
| 116 | #if CONFIG_SMALL |
| 117 | for (i = 0; i < 64; i++) { |
| 118 | CORE(i, a, b, c, d); |
| 119 | t = d; |
| 120 | d = c; |
| 121 | c = b; |
| 122 | b = a; |
| 123 | a = t; |
| 124 | } |
| 125 | #else |
| 126 | #define CORE2(i) \ |
| 127 | CORE(i, a, b, c, d); CORE((i + 1), d, a, b, c); \ |
| 128 | CORE((i + 2), c, d, a, b); CORE((i + 3), b, c, d, a) |
| 129 | #define CORE4(i) CORE2(i); CORE2((i + 4)); CORE2((i + 8)); CORE2((i + 12)) |
| 130 | CORE4(0); |
| 131 | CORE4(16); |
| 132 | CORE4(32); |
| 133 | CORE4(48); |
| 134 | #endif |
| 135 | |
| 136 | ABCD[0] += d; |
| 137 | ABCD[1] += c; |
| 138 | ABCD[2] += b; |
| 139 | ABCD[3] += a; |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | void av_md5_init(AVMD5 *ctx) |
| 144 | { |
| 145 | ctx->len = 0; |
| 146 | |
| 147 | ctx->ABCD[0] = 0x10325476; |
| 148 | ctx->ABCD[1] = 0x98badcfe; |
| 149 | ctx->ABCD[2] = 0xefcdab89; |
| 150 | ctx->ABCD[3] = 0x67452301; |
| 151 | } |
| 152 | |
| 153 | void av_md5_update(AVMD5 *ctx, const uint8_t *src, int len) |
| 154 | { |
| 155 | const uint8_t *end; |
| 156 | int j; |
| 157 | |
| 158 | j = ctx->len & 63; |
| 159 | ctx->len += len; |
| 160 | |
| 161 | if (j) { |
| 162 | int cnt = FFMIN(len, 64 - j); |
| 163 | memcpy(ctx->block + j, src, cnt); |
| 164 | src += cnt; |
| 165 | len -= cnt; |
| 166 | if (j + cnt < 64) |
| 167 | return; |
| 168 | body(ctx->ABCD, ctx->block, 1); |
| 169 | } |
| 170 | |
| 171 | end = src + (len & ~63); |
| 172 | if (!HAVE_FAST_UNALIGNED && ((intptr_t)src & 3)) { |
| 173 | while (src < end) { |
| 174 | memcpy(ctx->block, src, 64); |
| 175 | body(ctx->ABCD, ctx->block, 1); |
| 176 | src += 64; |
| 177 | } |
| 178 | } else { |
| 179 | int nblocks = len / 64; |
| 180 | body(ctx->ABCD, src, nblocks); |
| 181 | src = end; |
| 182 | } |
| 183 | len &= 63; |
| 184 | if (len > 0) |
| 185 | memcpy(ctx->block, src, len); |
| 186 | } |
| 187 | |
| 188 | void av_md5_final(AVMD5 *ctx, uint8_t *dst) |
| 189 | { |
| 190 | int i; |
| 191 | uint64_t finalcount = av_le2ne64(ctx->len << 3); |
| 192 | |
| 193 | av_md5_update(ctx, "\200", 1); |
| 194 | while ((ctx->len & 63) != 56) |
| 195 | av_md5_update(ctx, "", 1); |
| 196 | |
| 197 | av_md5_update(ctx, (uint8_t *) &finalcount, 8); |
| 198 | |
| 199 | for (i = 0; i < 4; i++) |
| 200 | AV_WL32(dst + 4 * i, ctx->ABCD[3 - i]); |
| 201 | } |
| 202 | |
| 203 | void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len) |
| 204 | { |
| 205 | AVMD5 ctx; |
| 206 | |
| 207 | av_md5_init(&ctx); |
| 208 | av_md5_update(&ctx, src, len); |
| 209 | av_md5_final(&ctx, dst); |
| 210 | } |
| 211 |