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95 lines
2.6 KiB
95 lines
2.6 KiB
#include <stdio.h>
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#include <iostream>
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#include <string>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include "genSha1.h"
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#define rol(x,n) ((x << n) | (x >> (32-n)))
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void getSha1FromBlock(unsigned char* str, uint32_t &h0, uint32_t &h1, //obliczenia na każdym bloku
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uint32_t &h2, uint32_t &h3, uint32_t &h4){
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uint32_t *w, a, b, c, d, e, k, f, tmp;
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w = new uint32_t[80];
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for(int j = 0; j < 16; j++){
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w[j] = str[j*4 + 0] * 0x1000000 //ustawianie szesnastu 32-bitowych słów
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+ str[j*4 + 1] * 0x10000
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+ str[j*4 + 2] * 0x100
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+ str[j*4 + 3];
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}
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for(int j = 16; j < 80; j++){ //rozszerzanie szesnastu słów do osiemdziesięciu
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w[j] = rol((w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16]),1);
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}
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a = h0; //inicjalizacja a,b,c,d,e
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b = h1;
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c = h2;
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d = h3;
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e = h4;
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for(int m=0;m<80;m++){ //działania...
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if(m <= 19){
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f = (b & c) | ((~b) & d);
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k = 0x5A827999;
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} else if(m <= 39){
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f = b ^ c ^ d;
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k = 0x6ED9EBA1;
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} else if(m <= 59){
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f = (b & c) | (b & d) | (c & d);
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k = 0x8F1BBCDC;
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} else {
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f = b ^ c ^ d;
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k = 0xCA62C1D6;
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}
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tmp = (rol(a,5) + f + e + k + w[m]);
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e = d;
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d = c;
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c = rol(b,30);
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b = a;
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a = tmp;
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}
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h0 = h0 + a; //przypis wartości
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h1 = h1 + b;
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h2 = h2 + c;
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h3 = h3 + d;
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h4 = h4 + e;
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delete[] w;
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}
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void sha1(unsigned char* message,unsigned short messageLength,char *result){
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int size = 64; //rozmiar jednego bloku musi być 512bit
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unsigned char *block;
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block = new unsigned char[size];
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memset(block,0,size);
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memcpy(block, message,messageLength* sizeof(char));
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block[messageLength] = 0x80;//tuż po zakończeniu wiadomości dodaje bity 10000000
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messageLength =messageLength* sizeof(char)*8; //rozmiar wiadomości w bitach
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block[63] = messageLength; // rozmiar wiadomość zapisany jako big-endian
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block[62] = messageLength >> 8;
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uint32_t h0, h1, h2, h3, h4; //wartości początkowe (z wikipedii)
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h0 = 0x67452301;
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h1 = 0xEFCDAB89;
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h2 = 0x98BADCFE;
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h3 = 0x10325476;
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h4 = 0xC3D2E1F0;
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getSha1FromBlock(block, h0, h1, h2, h3, h4);
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sprintf(result, "%08x%08x%08x%08x%08x", h0, h1, h2, h3, h4);
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delete[] block;
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}
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