2 * Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>
3 * based on public domain SHA-1 code by Steve Reid <steve@edmweb.com>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 typedef struct AVSHA1 {
32 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
34 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
35 #define blk0(i) (block[i] = be2me_32(((uint32_t*)buffer)[i]))
36 #define blk(i) (block[i] = rol(block[i-3]^block[i-8]^block[i-14]^block[i-16],1))
38 #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y) +blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
39 #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y) +blk (i)+0x5A827999+rol(v,5);w=rol(w,30);
40 #define R2(v,w,x,y,z,i) z+=( w^x ^y) +blk (i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
41 #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk (i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
42 #define R4(v,w,x,y,z,i) z+=( w^x ^y) +blk (i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
44 /* Hash a single 512-bit block. This is the core of the algorithm. */
46 static void transform(uint32_t state[5], uint8_t buffer[64]){
48 unsigned int i, a, b, c, d, e;
58 if(i<16) t= be2me_32(((uint32_t*)buffer)[i]);
59 else t= rol(block[i-3]^block[i-8]^block[i-14]^block[i-16],1);
63 if(i<20) t+= ((b&(c^d))^d) +0x5A827999;
64 else t+= ( b^c ^d) +0x6ED9EBA1;
66 if(i<60) t+= (((b|c)&d)|(b&c))+0x8F1BBCDC;
67 else t+= ( b^c ^d) +0xCA62C1D6;
77 R0(a,b,c,d,e,0+i); R0(e,a,b,c,d,1+i); R0(d,e,a,b,c,2+i); R0(c,d,e,a,b,3+i); R0(b,c,d,e,a,4+i);
79 R0(a,b,c,d,e,15); R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
80 for(i=20; i<40; i+=5){
81 R2(a,b,c,d,e,0+i); R2(e,a,b,c,d,1+i); R2(d,e,a,b,c,2+i); R2(c,d,e,a,b,3+i); R2(b,c,d,e,a,4+i);
84 R3(a,b,c,d,e,0+i); R3(e,a,b,c,d,1+i); R3(d,e,a,b,c,2+i); R3(c,d,e,a,b,3+i); R3(b,c,d,e,a,4+i);
87 R4(a,b,c,d,e,0+i); R4(e,a,b,c,d,1+i); R4(d,e,a,b,c,2+i); R4(c,d,e,a,b,3+i); R4(b,c,d,e,a,4+i);
97 void av_sha1_init(AVSHA1* ctx){
98 ctx->state[0] = 0x67452301;
99 ctx->state[1] = 0xEFCDAB89;
100 ctx->state[2] = 0x98BADCFE;
101 ctx->state[3] = 0x10325476;
102 ctx->state[4] = 0xC3D2E1F0;
106 void av_sha1_update(AVSHA1* ctx, uint8_t* data, unsigned int len){
112 for( i = 0; i < len; i++ ){
113 ctx->buffer[ j++ ] = data[i];
115 transform(ctx->state, ctx->buffer);
120 if ((j + len) > 63) {
121 memcpy(&ctx->buffer[j], data, (i = 64-j));
122 transform(ctx->state, ctx->buffer);
123 for ( ; i + 63 < len; i += 64) {
124 transform(ctx->state, &data[i]);
129 memcpy(&ctx->buffer[j], &data[i], len - i);
133 void av_sha1_final(AVSHA1* ctx, uint8_t digest[20]){
135 uint64_t finalcount= be2me_64(ctx->count<<3);
137 av_sha1_update(ctx, "\200", 1);
138 while ((ctx->count & 63) != 56) {
139 av_sha1_update(ctx, "", 1);
141 av_sha1_update(ctx, &finalcount, 8); /* Should cause a transform() */
143 ((uint32_t*)digest)[i]= be2me_32(ctx->state[i]);
146 // use the following to test
147 // gcc -DTEST -DHAVE_AV_CONFIG_H -I.. sha1.c -O2 -W -Wall -o sha1 && time ./sha1
155 unsigned char digest[20];
160 av_sha1_update(&ctx, "abc", 3);
162 av_sha1_update(&ctx, "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56);
164 for(i=0; i<1000*1000; i++)
165 av_sha1_update(&ctx, "a", 1);
166 av_sha1_final(&ctx, digest);
167 for (i = 0; i < 20; i++)
168 printf("%02X", digest[i]);
171 //Test Vectors (from FIPS PUB 180-1)
172 printf("A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D\n"
173 "84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1\n"
174 "34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F\n");