/* * Copyright (C) 2006 Michael Niedermayer (michaelni@gmx.at) * Copyright (C) 2003-2005 by Christopher R. Hertel (crh@ubiqx.mn.org) * * References: * IETF RFC 1321: The MD5 Message-Digest Algorithm * Ron Rivest. IETF, April, 1992 * * based on http://ubiqx.org/libcifs/source/Auth/MD5.c * from Christopher R. Hertel (crh@ubiqx.mn.org) * Simplified, cleaned and IMO redundant comments removed by Michael. * * If you use gcc, then version 4.1 or later and -fomit-frame-pointer is * strongly recommended. * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdint.h> #include <string.h> #include "bswap.h" #include "intreadwrite.h" #include "macros.h" #include "mem.h" #include "md5.h" typedef struct AVMD5 { uint64_t len; uint8_t block[64]; uint32_t ABCD[4]; } AVMD5; const int av_md5_size = sizeof(AVMD5); struct AVMD5 *av_md5_alloc(void) { return av_mallocz(sizeof(struct AVMD5)); } static const uint8_t S[4][4] = { { 7, 12, 17, 22 }, /* round 1 */ { 5, 9, 14, 20 }, /* round 2 */ { 4, 11, 16, 23 }, /* round 3 */ { 6, 10, 15, 21 } /* round 4 */ }; static const uint32_t T[64] = { // T[i]= fabs(sin(i+1)<<32) 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, /* round 1 */ 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, /* round 2 */ 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, /* round 3 */ 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, /* round 4 */ 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391, }; #define CORE(i, a, b, c, d) \ do { \ t = S[i >> 4][i & 3]; \ a += T[i]; \ \ if (i < 32) { \ if (i < 16) \ a += (d ^ (b & (c ^ d))) + AV_RL32(X+( i & 15));\ else \ a += ((d & b) | (~d & c)) + AV_RL32(X+((1 + 5*i) & 15));\ } else { \ if (i < 48) \ a += (b ^ c ^ d) + AV_RL32(X+((5 + 3*i) & 15));\ else \ a += (c ^ (b | ~d)) + AV_RL32(X+(( 7*i) & 15));\ } \ a = b + (a << t | a >> (32 - t)); \ } while (0) static void body(uint32_t ABCD[4], const uint8_t *src, size_t nblocks) { const uint32_t *X; uint32_t a, b, c, d, t; for (size_t n = 0; n < nblocks; n++) { a = ABCD[3]; b = ABCD[2]; c = ABCD[1]; d = ABCD[0]; X = (const uint32_t *)src + n * 16; #if CONFIG_SMALL for (int i = 0; i < 64; i++) { CORE(i, a, b, c, d); t = d; d = c; c = b; b = a; a = t; } #else #define CORE2(i) \ CORE(i, a, b, c, d); CORE((i + 1), d, a, b, c); \ CORE((i + 2), c, d, a, b); CORE((i + 3), b, c, d, a) #define CORE4(i) CORE2(i); CORE2((i + 4)); CORE2((i + 8)); CORE2((i + 12)) CORE4(0); CORE4(16); CORE4(32); CORE4(48); #endif ABCD[0] += d; ABCD[1] += c; ABCD[2] += b; ABCD[3] += a; } } void av_md5_init(AVMD5 *ctx) { ctx->len = 0; ctx->ABCD[0] = 0x10325476; ctx->ABCD[1] = 0x98badcfe; ctx->ABCD[2] = 0xefcdab89; ctx->ABCD[3] = 0x67452301; } void av_md5_update(AVMD5 *ctx, const uint8_t *src, size_t len) { const uint8_t *end; int j; j = ctx->len & 63; ctx->len += len; if (j) { int cnt = FFMIN(len, 64 - j); memcpy(ctx->block + j, src, cnt); src += cnt; len -= cnt; if (j + cnt < 64) return; body(ctx->ABCD, ctx->block, 1); } end = src + (len & ~63); if (!HAVE_FAST_UNALIGNED && ((intptr_t)src & 3)) { while (src < end) { memcpy(ctx->block, src, 64); body(ctx->ABCD, ctx->block, 1); src += 64; } } else { size_t nblocks = len / 64; body(ctx->ABCD, src, nblocks); src = end; } len &= 63; if (len > 0) memcpy(ctx->block, src, len); } void av_md5_final(AVMD5 *ctx, uint8_t *dst) { int i; uint64_t finalcount = av_le2ne64(ctx->len << 3); av_md5_update(ctx, "\200", 1); while ((ctx->len & 63) != 56) av_md5_update(ctx, "", 1); av_md5_update(ctx, (uint8_t *) &finalcount, 8); for (i = 0; i < 4; i++) AV_WL32(dst + 4 * i, ctx->ABCD[3 - i]); } void av_md5_sum(uint8_t *dst, const uint8_t *src, size_t len) { AVMD5 ctx; av_md5_init(&ctx); av_md5_update(&ctx, src, len); av_md5_final(&ctx, dst); }