From 7c60e55bff8af61760038c5c7471abd11fa80afd Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Mon, 12 Mar 2007 21:05:56 +0000 Subject: [PATCH] simple SHA-1 implementation Originally committed as revision 8351 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavutil/sha1.c | 151 +++++++++++++++++++++++++++++++++++++++++++++++ libavutil/sha1.h | 11 ++++ 2 files changed, 162 insertions(+) create mode 100644 libavutil/sha1.c create mode 100644 libavutil/sha1.h diff --git a/libavutil/sha1.c b/libavutil/sha1.c new file mode 100644 index 0000000000..3c46140c72 --- /dev/null +++ b/libavutil/sha1.c @@ -0,0 +1,151 @@ +// SHA-1 code Copyright 2007 Michael Nidermayer +// license LGPL +// based on public domain SHA-1 code by Steve Reid + +#include "common.h" +#include "sha1.h" + +typedef struct AVSHA1 { + uint32_t state[5]; + uint64_t count; + uint8_t buffer[64]; +} AVSHA1; + +#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) + +/* blk0() and blk() perform the initial expand. */ +/* I got the idea of expanding during the round function from SSLeay */ +#define blk0(i) (block[i] = be2me_32(block[i])) +#define blk(i) (block[i&15] = rol(block[(i+13)&15]^block[(i+8)&15]^block[(i+2)&15]^block[i&15],1)) + +/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */ +#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]){ + unsigned int a, b, c, d, e, i; + uint32_t* block= buffer; + /* Copy context->state[] to working vars */ + a = state[0]; + b = state[1]; + c = state[2]; + d = state[3]; + e = state[4]; +#if 1 + 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); + } +#else + R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3); + R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7); + R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11); + R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); 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); + R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23); + R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27); + R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31); + R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35); + R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39); + R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43); + R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47); + R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51); + R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55); + R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59); + R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63); + R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67); + R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71); + R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75); + R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79); +#endif + state[0] += a; + state[1] += b; + state[2] += c; + state[3] += d; + state[4] += e; +} + +void av_sha1_init(AVSHA1* context){ + context->state[0] = 0x67452301; + context->state[1] = 0xEFCDAB89; + context->state[2] = 0x98BADCFE; + context->state[3] = 0x10325476; + context->state[4] = 0xC3D2E1F0; + context->count = 0; +} + +void av_sha1_update(AVSHA1* context, uint8_t* data, unsigned int len){ + unsigned int i, j; + + j = (context->count >> 3) & 63; + context->count += len << 3; + if ((j + len) > 63) { + memcpy(&context->buffer[j], data, (i = 64-j)); + transform(context->state, context->buffer); + for ( ; i + 63 < len; i += 64) { + transform(context->state, &data[i]); + } + } + else i = 0; + memcpy(&context->buffer[j], &data[i], len - i); +} + +void av_sha1_final(AVSHA1* context, uint8_t digest[20]){ + int i; + uint64_t finalcount= be2me_64(context->count); + + av_sha1_update(context, "\200", 1); + while ((context->count & 504) != 448) { + av_sha1_update(context, "\0", 1); + } + av_sha1_update(context, &finalcount, 8); /* Should cause a transform() */ + for (i = 0; i < 20; i++) { + digest[i] = context->state[i>>2] >> ((3-(i & 3)) * 8) ; + } +} + +#ifdef TEST +#include +#undef printf + +int main(){ + int i, k; + AVSHA1 context; + unsigned char digest[20]; + + for(k=0; k<3; k++){ + av_sha1_init(&context); + if(k==0) + av_sha1_update(&context, "abc", 3); + else if(k==1) + av_sha1_update(&context, "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56); + else + for(i=0; i<1000*1000; i++) + av_sha1_update(&context, "a", 1); + av_sha1_final(&context, 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 diff --git a/libavutil/sha1.h b/libavutil/sha1.h new file mode 100644 index 0000000000..8739cbde93 --- /dev/null +++ b/libavutil/sha1.h @@ -0,0 +1,11 @@ +#ifndef AV_SHA1_H +#define AV_SHA1_H + +extern const int av_sha1_size; + +struct AVSHA1; + +void av_sha1_init(struct AVSHA1* context); +void av_sha1_update(struct AVSHA1* context, uint8_t* data, unsigned int len); +void av_sha1_final(struct AVSHA1* context, uint8_t digest[20]); +#endif