/* * 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 "common.h" #include <string.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); 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) \ t = S[i>>4][i&3];\ a += T[i];\ \ if(i<32){\ if(i<16) a += (d ^ (b&(c^d))) + X[ i &15 ];\ else a += (c ^ (d&(c^b))) + X[ (1+5*i)&15 ];\ }else{\ if(i<48) a += (b^c^d) + X[ (5+3*i)&15 ];\ else a += (c^(b|~d)) + X[ ( 7*i)&15 ];\ }\ a = b + (( a << t ) | ( a >> (32 - t) )); static void body(uint32_t ABCD[4], uint32_t X[16]){ int t; int i av_unused; unsigned int a= ABCD[3]; unsigned int b= ABCD[2]; unsigned int c= ABCD[1]; unsigned int d= ABCD[0]; #ifdef WORDS_BIGENDIAN for(i=0; i<16; i++) X[i]= bswap_32(X[i]); #endif #ifdef CONFIG_SMALL for( 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, const int len){ int i, j; j= ctx->len & 63; ctx->len += len; for( i = 0; i < len; i++ ){ ctx->block[j++] = src[i]; if( 64 == j ){ body(ctx->ABCD, (uint32_t*) ctx->block); j = 0; } } } void av_md5_final(AVMD5 *ctx, uint8_t *dst){ int i; uint64_t finalcount= le2me_64(ctx->len<<3); av_md5_update(ctx, "\200", 1); while((ctx->len & 63)<56) av_md5_update(ctx, "", 1); av_md5_update(ctx, &finalcount, 8); for(i=0; i<4; i++) ((uint32_t*)dst)[i]= le2me_32(ctx->ABCD[3-i]); } void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len){ AVMD5 ctx[1]; av_md5_init(ctx); av_md5_update(ctx, src, len); av_md5_final(ctx, dst); } #ifdef TEST #include <stdio.h> #undef printf main(void){ uint64_t md5val; int i; uint8_t in[1000]; for(i=0; i<1000; i++) in[i]= i*i; av_md5_sum( (uint8_t*)&md5val, in, 1000); printf("%"PRId64"\n", md5val); av_md5_sum( (uint8_t*)&md5val, in, 63); printf("%"PRId64"\n", md5val); av_md5_sum( (uint8_t*)&md5val, in, 64); printf("%"PRId64"\n", md5val); av_md5_sum( (uint8_t*)&md5val, in, 65); printf("%"PRId64"\n", md5val); for(i=0; i<1000; i++) in[i]= i % 127; av_md5_sum( (uint8_t*)&md5val, in, 999); printf("%"PRId64"\n", md5val); } #endif