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Diffstat (limited to 'contrib/ffmpeg/libavutil/sha1.c')
| -rw-r--r-- | contrib/ffmpeg/libavutil/sha1.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavutil/sha1.c b/contrib/ffmpeg/libavutil/sha1.c new file mode 100644 index 000000000..6c10791f4 --- /dev/null +++ b/contrib/ffmpeg/libavutil/sha1.c @@ -0,0 +1,160 @@ +// SHA-1 code Copyright 2007 Michael Nidermayer <michaelni@gmx.at> +// license LGPL +// based on public domain SHA-1 code by Steve Reid <steve@edmweb.com> + +#include "common.h" +#include "sha1.h" + +typedef struct AVSHA1 { + uint64_t count; + uint8_t buffer[64]; + uint32_t state[5]; +} 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(((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], 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]; +#ifdef 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, uint8_t* data, unsigned int len){ + unsigned int i, j; + + j = ctx->count & 63; + ctx->count += len; +#ifdef 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, &finalcount, 8); /* Should cause a transform() */ + for(i=0; i<5; i++) + ((uint32_t*)digest)[i]= be2me_32(ctx->state[i]); +} + +// use the following to test +// gcc -DTEST -DHAVE_AV_CONFIG_H -I.. sha1.c -O2 -W -Wall -o sha1 && time ./sha1 +#ifdef TEST +#include <stdio.h> +#undef printf + +int main(){ + 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 |