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// SHA-1 code Copyright 2007 Michael Nidermayer <michaelni@gmx.at>
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// license LGPL
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// based on public domain SHA-1 code by Steve Reid <steve@edmweb.com>
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#include "common.h"
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#include "sha1.h"
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typedef struct AVSHA1 {
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    uint32_t state[5];
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    uint64_t count;
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    uint8_t buffer[64];
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} AVSHA1;
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#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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/* blk0() and blk() perform the initial expand. */
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/* I got the idea of expanding during the round function from SSLeay */
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#define blk0(i) (block[i] = be2me_32(block[i]))
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#define blk(i) (block[i] = rol(block[i-3]^block[i-8]^block[i-14]^block[i-16],1))
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/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
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#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)    +blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
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#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)    +blk (i)+0x5A827999+rol(v,5);w=rol(w,30);
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#define R2(v,w,x,y,z,i) z+=( w^x     ^y)    +blk (i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
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#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk (i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
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#define R4(v,w,x,y,z,i) z+=( w^x     ^y)    +blk (i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
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/* Hash a single 512-bit block. This is the core of the algorithm. */
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static void transform(uint32_t state[5], uint8_t buffer[64]){
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    unsigned int a, b, c, d, e, i;
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    uint32_t block[80];
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    memcpy(block, buffer, 64);
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    /* Copy context->state[] to working vars */
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    a = state[0];
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    b = state[1];
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    c = state[2];
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    d = state[3];
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    e = state[4];
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#if 1
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    for(i=0; i<15; i+=5){
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        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);
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    }
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    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);
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    for(i=20; i<40; i+=5){
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        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);
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    }
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    for(; i<60; i+=5){
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        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);
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    }
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    for(; i<80; i+=5){
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        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);
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    }
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#else
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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    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);
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#endif
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    state[0] += a;
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    state[1] += b;
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    state[2] += c;
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    state[3] += d;
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    state[4] += e;
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}
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void av_sha1_init(AVSHA1* context){
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    context->state[0] = 0x67452301;
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    context->state[1] = 0xEFCDAB89;
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    context->state[2] = 0x98BADCFE;
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    context->state[3] = 0x10325476;
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    context->state[4] = 0xC3D2E1F0;
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    context->count    = 0;
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}
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void av_sha1_update(AVSHA1* context, uint8_t* data, unsigned int len){
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    unsigned int i, j;
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    j = (context->count >> 3) & 63;
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    context->count += len << 3;
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    if ((j + len) > 63) {
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        memcpy(&context->buffer[j], data, (i = 64-j));
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        transform(context->state, context->buffer);
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        for ( ; i + 63 < len; i += 64) {
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            transform(context->state, &data[i]);
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        }
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    }
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    else i = 0;
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    memcpy(&context->buffer[j], &data[i], len - i);
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}
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void av_sha1_final(AVSHA1* context, uint8_t digest[20]){
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    int i;
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    uint64_t finalcount= be2me_64(context->count);
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    av_sha1_update(context, "\200", 1);
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    while ((context->count & 504) != 448) {
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        av_sha1_update(context, "\0", 1);
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    }
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    av_sha1_update(context, &finalcount, 8);  /* Should cause a transform() */
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    for (i = 0; i < 20; i++) {
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        digest[i] = context->state[i>>2] >> ((3-(i & 3)) * 8) ;
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    }
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}
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// use the following to test
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// gcc -DTEST -DHAVE_AV_CONFIG_H -I.. sha1.c -O2 -W -Wall -o sha1 && time ./sha1
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#ifdef TEST
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#include <stdio.h>
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#undef printf
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int main(){
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    int i, k;
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    AVSHA1 context;
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    unsigned char digest[20];
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    for(k=0; k<3; k++){
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        av_sha1_init(&context);
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        if(k==0)
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            av_sha1_update(&context, "abc", 3);
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        else if(k==1)
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            av_sha1_update(&context, "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56);
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        else
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            for(i=0; i<1000*1000; i++)
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                av_sha1_update(&context, "a", 1);
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        av_sha1_final(&context, digest);
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        for (i = 0; i < 20; i++)
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            printf("%02X", digest[i]);
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        putchar('\n');
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    }
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    //Test Vectors (from FIPS PUB 180-1)
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    printf("A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D\n"
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           "84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1\n"
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           "34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F\n");
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    return 0;
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}
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#endif