yading@11: /* yading@11: * Copyright (C) 2006 Michael Niedermayer (michaelni@gmx.at) yading@11: * Copyright (C) 2003-2005 by Christopher R. Hertel (crh@ubiqx.mn.org) yading@11: * yading@11: * References: yading@11: * IETF RFC 1321: The MD5 Message-Digest Algorithm yading@11: * Ron Rivest. IETF, April, 1992 yading@11: * yading@11: * based on http://ubiqx.org/libcifs/source/Auth/MD5.c yading@11: * from Christopher R. Hertel (crh@ubiqx.mn.org) yading@11: * Simplified, cleaned and IMO redundant comments removed by michael. yading@11: * yading@11: * If you use gcc, then version 4.1 or later and -fomit-frame-pointer is yading@11: * strongly recommended. yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: #include yading@11: #include "bswap.h" yading@11: #include "intreadwrite.h" yading@11: #include "md5.h" yading@11: #include "mem.h" yading@11: yading@11: typedef struct AVMD5{ yading@11: uint64_t len; yading@11: uint8_t block[64]; yading@11: uint32_t ABCD[4]; yading@11: } AVMD5; yading@11: yading@11: const int av_md5_size = sizeof(AVMD5); yading@11: yading@11: struct AVMD5 *av_md5_alloc(void) yading@11: { yading@11: return av_mallocz(sizeof(struct AVMD5)); yading@11: } yading@11: yading@11: static const uint8_t S[4][4] = { yading@11: { 7, 12, 17, 22 }, /* round 1 */ yading@11: { 5, 9, 14, 20 }, /* round 2 */ yading@11: { 4, 11, 16, 23 }, /* round 3 */ yading@11: { 6, 10, 15, 21 } /* round 4 */ yading@11: }; yading@11: yading@11: static const uint32_t T[64] = { // T[i]= fabs(sin(i+1)<<32) yading@11: 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, /* round 1 */ yading@11: 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, yading@11: 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, yading@11: 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, yading@11: yading@11: 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, /* round 2 */ yading@11: 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, yading@11: 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, yading@11: 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, yading@11: yading@11: 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, /* round 3 */ yading@11: 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, yading@11: 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, yading@11: 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, yading@11: yading@11: 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, /* round 4 */ yading@11: 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, yading@11: 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, yading@11: 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391, yading@11: }; yading@11: yading@11: #define CORE(i, a, b, c, d) do { \ yading@11: t = S[i >> 4][i & 3]; \ yading@11: a += T[i]; \ yading@11: \ yading@11: if (i < 32) { \ yading@11: if (i < 16) a += (d ^ (b & (c ^ d))) + X[ i & 15]; \ yading@11: else a += (c ^ (d & (c ^ b))) + X[(1 + 5*i) & 15]; \ yading@11: } else { \ yading@11: if (i < 48) a += (b ^ c ^ d) + X[(5 + 3*i) & 15]; \ yading@11: else a += (c ^ (b | ~d)) + X[( 7*i) & 15]; \ yading@11: } \ yading@11: a = b + (a << t | a >> (32 - t)); \ yading@11: } while (0) yading@11: yading@11: static void body(uint32_t ABCD[4], uint32_t X[16]) yading@11: { yading@11: int i av_unused; yading@11: uint32_t t; yading@11: uint32_t a = ABCD[3]; yading@11: uint32_t b = ABCD[2]; yading@11: uint32_t c = ABCD[1]; yading@11: uint32_t d = ABCD[0]; yading@11: yading@11: #if HAVE_BIGENDIAN yading@11: for (i = 0; i < 16; i++) yading@11: X[i] = av_bswap32(X[i]); yading@11: #endif yading@11: yading@11: #if CONFIG_SMALL yading@11: for (i = 0; i < 64; i++) { yading@11: CORE(i, a, b, c, d); yading@11: t = d; yading@11: d = c; yading@11: c = b; yading@11: b = a; yading@11: a = t; yading@11: } yading@11: #else yading@11: #define CORE2(i) \ yading@11: CORE( i, a,b,c,d); CORE((i+1),d,a,b,c); \ yading@11: CORE((i+2),c,d,a,b); CORE((i+3),b,c,d,a) yading@11: #define CORE4(i) CORE2(i); CORE2((i+4)); CORE2((i+8)); CORE2((i+12)) yading@11: CORE4(0); CORE4(16); CORE4(32); CORE4(48); yading@11: #endif yading@11: yading@11: ABCD[0] += d; yading@11: ABCD[1] += c; yading@11: ABCD[2] += b; yading@11: ABCD[3] += a; yading@11: } yading@11: yading@11: void av_md5_init(AVMD5 *ctx) yading@11: { yading@11: ctx->len = 0; yading@11: yading@11: ctx->ABCD[0] = 0x10325476; yading@11: ctx->ABCD[1] = 0x98badcfe; yading@11: ctx->ABCD[2] = 0xefcdab89; yading@11: ctx->ABCD[3] = 0x67452301; yading@11: } yading@11: yading@11: void av_md5_update(AVMD5 *ctx, const uint8_t *src, const int len) yading@11: { yading@11: int i, j; yading@11: yading@11: j = ctx->len & 63; yading@11: ctx->len += len; yading@11: yading@11: for (i = 0; i < len; i++) { yading@11: ctx->block[j++] = src[i]; yading@11: if (j == 64) { yading@11: body(ctx->ABCD, (uint32_t *) ctx->block); yading@11: j = 0; yading@11: } yading@11: } yading@11: } yading@11: yading@11: void av_md5_final(AVMD5 *ctx, uint8_t *dst) yading@11: { yading@11: int i; yading@11: uint64_t finalcount = av_le2ne64(ctx->len << 3); yading@11: yading@11: av_md5_update(ctx, "\200", 1); yading@11: while ((ctx->len & 63) != 56) yading@11: av_md5_update(ctx, "", 1); yading@11: yading@11: av_md5_update(ctx, (uint8_t *)&finalcount, 8); yading@11: yading@11: for (i = 0; i < 4; i++) yading@11: AV_WL32(dst + 4*i, ctx->ABCD[3 - i]); yading@11: } yading@11: yading@11: void av_md5_sum(uint8_t *dst, const uint8_t *src, const int len) yading@11: { yading@11: AVMD5 ctx; yading@11: yading@11: av_md5_init(&ctx); yading@11: av_md5_update(&ctx, src, len); yading@11: av_md5_final(&ctx, dst); yading@11: } yading@11: yading@11: #ifdef TEST yading@11: #include yading@11: yading@11: static void print_md5(uint8_t *md5) yading@11: { yading@11: int i; yading@11: for (i = 0; i < 16; i++) yading@11: printf("%02x", md5[i]); yading@11: printf("\n"); yading@11: } yading@11: yading@11: int main(void){ yading@11: uint8_t md5val[16]; yading@11: int i; yading@11: uint8_t in[1000]; yading@11: yading@11: for (i = 0; i < 1000; i++) yading@11: in[i] = i * i; yading@11: av_md5_sum(md5val, in, 1000); print_md5(md5val); yading@11: av_md5_sum(md5val, in, 63); print_md5(md5val); yading@11: av_md5_sum(md5val, in, 64); print_md5(md5val); yading@11: av_md5_sum(md5val, in, 65); print_md5(md5val); yading@11: for (i = 0; i < 1000; i++) yading@11: in[i] = i % 127; yading@11: av_md5_sum(md5val, in, 999); print_md5(md5val); yading@11: yading@11: return 0; yading@11: } yading@11: #endif