/* * Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at> * based on public domain SHA-1 code by Steve Reid <steve@edmweb.com> * * 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 "bswap.h" #include "sha1.h" typedef struct AVSHA1 { uint64_t count; uint8_t buffer[64]; uint32_t state[5]; } AVSHA1; const int av_sha1_size = sizeof(AVSHA1); #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */ #define blk0(i) (block[i] = be2me_32(((const uint32_t*)buffer)[i])) #define blk(i) (block[i] = rol(block[i-3]^block[i-8]^block[i-14]^block[i-16],1)) #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y) +blk0(i)+0x5A827999+rol(v,5);w=rol(w,30); #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y) +blk (i)+0x5A827999+rol(v,5);w=rol(w,30); #define R2(v,w,x,y,z,i) z+=( w^x ^y) +blk (i)+0x6ED9EBA1+rol(v,5);w=rol(w,30); #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk (i)+0x8F1BBCDC+rol(v,5);w=rol(w,30); #define R4(v,w,x,y,z,i) z+=( w^x ^y) +blk (i)+0xCA62C1D6+rol(v,5);w=rol(w,30); /* Hash a single 512-bit block. This is the core of the algorithm. */ static void transform(uint32_t state[5], const uint8_t buffer[64]){ uint32_t block[80]; unsigned int i, a, b, c, d, e; a = state[0]; b = state[1]; c = state[2]; d = state[3]; e = state[4]; #if CONFIG_SMALL for(i=0; i<80; i++){ int t; if(i<16) t= be2me_32(((uint32_t*)buffer)[i]); else t= rol(block[i-3]^block[i-8]^block[i-14]^block[i-16],1); block[i]= t; t+= e+rol(a,5); if(i<40){ if(i<20) t+= ((b&(c^d))^d) +0x5A827999; else t+= ( b^c ^d) +0x6ED9EBA1; }else{ if(i<60) t+= (((b|c)&d)|(b&c))+0x8F1BBCDC; else t+= ( b^c ^d) +0xCA62C1D6; } e= d; d= c; c= rol(b,30); b= a; a= t; } #else for(i=0; i<15; i+=5){ 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); } 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); for(i=20; i<40; i+=5){ 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); } for(; i<60; i+=5){ 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); } for(; i<80; i+=5){ 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); } #endif state[0] += a; state[1] += b; state[2] += c; state[3] += d; state[4] += e; } void av_sha1_init(AVSHA1* ctx){ ctx->state[0] = 0x67452301; ctx->state[1] = 0xEFCDAB89; ctx->state[2] = 0x98BADCFE; ctx->state[3] = 0x10325476; ctx->state[4] = 0xC3D2E1F0; ctx->count = 0; } void av_sha1_update(AVSHA1* ctx, const uint8_t* data, unsigned int len){ unsigned int i, j; j = ctx->count & 63; ctx->count += len; #if CONFIG_SMALL for( i = 0; i < len; i++ ){ ctx->buffer[ j++ ] = data[i]; if( 64 == j ){ transform(ctx->state, ctx->buffer); j = 0; } } #else if ((j + len) > 63) { memcpy(&ctx->buffer[j], data, (i = 64-j)); transform(ctx->state, ctx->buffer); for ( ; i + 63 < len; i += 64) { transform(ctx->state, &data[i]); } j=0; } else i = 0; memcpy(&ctx->buffer[j], &data[i], len - i); #endif } void av_sha1_final(AVSHA1* ctx, uint8_t digest[20]){ int i; uint64_t finalcount= be2me_64(ctx->count<<3); av_sha1_update(ctx, "\200", 1); while ((ctx->count & 63) != 56) { av_sha1_update(ctx, "", 1); } av_sha1_update(ctx, (uint8_t *)&finalcount, 8); /* Should cause a transform() */ for(i=0; i<5; i++) ((uint32_t*)digest)[i]= be2me_32(ctx->state[i]); } #ifdef TEST #include <stdio.h> #undef printf int main(void){ int i, k; AVSHA1 ctx; unsigned char digest[20]; for(k=0; k<3; k++){ av_sha1_init(&ctx); if(k==0) av_sha1_update(&ctx, "abc", 3); else if(k==1) av_sha1_update(&ctx, "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56); else for(i=0; i<1000*1000; i++) av_sha1_update(&ctx, "a", 1); av_sha1_final(&ctx, digest); for (i = 0; i < 20; i++) printf("%02X", digest[i]); putchar('\n'); } //test vectors (from FIPS PUB 180-1) printf("A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D\n" "84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1\n" "34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F\n"); return 0; } #endif