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sha2563.cpp
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#include <cstring>
#include <fstream>
#include "sha2563.h"
#include <iostream>
#include <bitset>
using namespace std;
const unsigned int SHA256::sha256_k[64] = //UL = uint32
{0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
void SHA256::rev_transform()
{
unsigned char *sub_block;
uint32 i = 0;
uint32 j = 0;
pp--;
sub_block = pmem[pp];
pmem[pp] = 0;
lp--;
for (i += mem[lp], mem[lp] -= i; i > 0; i--) {
lp--;
for (j += mem[lp], mem[lp] -= j; j > 0; j--) {
m_h[j - 1] -= wv[j - 1];
}
lp--;
for (j += mem[lp], mem[lp] -= j; j > 0; j--) {
wv[0] -= t1 + t2;
wv[0] += wv[1];
wv[1] -= wv[0];
wv[1] += wv[2];
wv[2] -= wv[1];
wv[2] += wv[3];
wv[3] -= wv[2];
wv[3] += wv[4] - t1;
wv[4] -= wv[3] + t1;
wv[4] += wv[5];
wv[5] -= wv[4];
wv[5] += wv[6];
wv[6] -= wv[5];
wv[6] += wv[7];
wv[7] -= wv[6];
pop(&(wv[7]));
t2 -= SHA256_F1(wv[0]) + SHA2_MAJ(wv[0], wv[1], wv[2]);
pop(&(t2));
t1 -= wv[7] + SHA256_F2(wv[4]) + SHA2_CH(wv[4], wv[5], wv[6])
+ sha256_k[j - 1] + w[j - 1];
pop(&(t1));
}
lp--;
for (j += mem[lp], mem[lp] -= j; j > 0; j--) {
wv[j - 1] -= m_h[j - 1];
pop(&(wv[j - 1]));
}
lp--;
for (j += mem[lp], mem[lp] -= j; j > 16; j--) {
w[j - 1] -= SHA256_F4(w[j - 2 - 1]) + w[j - 7 - 1] + SHA256_F3(w[j - 15 - 1]) + w[j - 16 - 1];
pop(&(w[j - 1]));
}
for (; j > 0; j--) {
REV_SHA2_PACK32(&sub_block[j - 1 << 2], &w[j - 1]);
pop(&(w[j - 1]));
}
pp--;
sub_block = 0;
sub_block = pmem[pp];
}
}
void SHA256::transform(unsigned char *message, unsigned int block_nb)
{
unsigned char *sub_block;
uint32 i;
uint32 j;
for (i = 0; i < (int) block_nb; i++) {
cout << "1 giro ale" << endl;
pmem[pp] = sub_block;
sub_block = 0;
pp++;
sub_block = message + (i << 6);
for (j = 0; j < 16; j++) {
push(&(w[j]));
SHA2_PACK32(&sub_block[j << 2], &w[j]);
}
for (j = 16; j < 64; j++) {
push(&(w[j]));
w[j] = SHA256_F4(w[j - 2]) + w[j - 7] + SHA256_F3(w[j - 15]) + w[j - 16];
}
push(&(j));
for (j = 0; j < 8; j++) {
push(&(wv[j]));
wv[j] += m_h[j];
}
push(&(j));
for (j = 0; j < 64; j++) {
push(&(t1));
t1 += wv[7] + SHA256_F2(wv[4]) + SHA2_CH(wv[4], wv[5], wv[6])
+ sha256_k[j] + w[j];
push(&(t2));
t2 += SHA256_F1(wv[0]) + SHA2_MAJ(wv[0], wv[1], wv[2]);
push(&(wv[7]));
wv[7] += wv[6];
wv[6] -= wv[7];
wv[6] += wv[5];
wv[5] -= wv[6];
wv[5] += wv[4];
wv[4] -= wv[5];
wv[4] += wv[3] + t1;
wv[3] -= wv[4] - t1;
wv[3] += wv[2];
wv[2] -= wv[3];
wv[2] += wv[1];
wv[1] -= wv[2];
wv[1] += wv[0];
wv[0] -= wv[1];
wv[0] += t1 + t2;
}
push(&(j));
for (j = 0; j < 8; j++) {
m_h[j] += wv[j];
}
push(&(j));
}
push(&(i));
pmem[pp] = sub_block;
sub_block = 0;
pp++;
}
void SHA256::init() //vengono inizializzate le 8 variabili che sono i numeri primi di non mi ricordo cosa.
{
m_h[0] = 0x6a09e667;
m_h[1] = 0xbb67ae85;
m_h[2] = 0x3c6ef372;
m_h[3] = 0xa54ff53a;
m_h[4] = 0x510e527f;
m_h[5] = 0x9b05688c;
m_h[6] = 0x1f83d9ab;
m_h[7] = 0x5be0cd19;
m_len = 0;
m_tot_len = 0;
lp = 0;
pp = 0;
sp = 0;
}
void SHA256::update(unsigned char *message, unsigned int len, unsigned char* digest) //i valori sono il mesasggio e la sua lunghezza
{
unsigned int block_nb = 0;
unsigned int fm_len = 0;
unsigned int blocks_n = 0;
unsigned int i = 0;
blocks_n += len / SHA224_256_BLOCK_SIZE;
m_len += len % SHA224_256_BLOCK_SIZE;
cout << "SHA224_256_BLOCK_SIZE: " << SHA224_256_BLOCK_SIZE << endl;
cout << "len: " << len << endl;
cout <<"m_len: " << m_len << endl;
cout <<"blocks_n: " << blocks_n << endl;
block_nb += (1 + ((SHA224_256_BLOCK_SIZE - 9)
< (m_len))); //block_nb diventa 1 se la lunghezza del messaggio è inferiore a 56 bit, 2 altrimenti
cout <<"block_nb: " << block_nb << endl;
fm_len += (blocks_n * SHA224_256_BLOCK_SIZE) + (block_nb * SHA224_256_BLOCK_SIZE);
m_block = (unsigned char*) malloc(sizeof(char) * fm_len);
for (; i < fm_len; i++) {
m_block[i] = 0x00;
}
memcpy(m_block, message, len);
m_block[len] += 0x80;
for (i += len + 1 ; i % SHA224_256_BLOCK_SIZE != SHA224_256_BLOCK_SIZE - 9; i++) {
m_block[i] += 0x00;
}
push(&(i));
SHA2_UNPACK32(len << 3, m_block + fm_len- 4);
int j;
for (j=0; j < (blocks_n * SHA224_256_BLOCK_SIZE) + (block_nb * SHA224_256_BLOCK_SIZE); j++) {
bitset<8> x(m_block[j]);
cout << x << '\n';
}
cout << endl;
cout << "J: " << j << endl;
transform(m_block, fm_len/SHA224_256_BLOCK_SIZE);
for (i = 0 ; i < 8; i++) {
SHA2_UNPACK32(m_h[i], &digest[i << 2]);
}
mem[lp] += i;
i -= mem[lp];
lp++;
push(&(block_nb));
push(&(fm_len));
push(&(blocks_n));
cout << "lp: " << lp << endl;
cout << "sp: " << sp << endl;
cout << "pp: " << pp << endl;
}
void SHA256::rev_update(unsigned char *message, unsigned int len, unsigned char *digest) //i valori sono il mesasggio e la sua lunghezza
{
unsigned int block_nb = 0;
unsigned int fm_len = 0;
unsigned int blocks_n = 0;
int i = 0;
pop(&(blocks_n));
pop(&(fm_len));
pop(&(block_nb));
lp--;
for (i += mem[lp], mem[lp] -= i ; i > 0; i--) {
REV_SHA2_UNPACK32(m_h[i], &digest[i << 2]);
}
rev_transform();
REV_SHA2_UNPACK32(len << 3, m_block + fm_len- 4);
lp--;
for (i += mem[lp], mem[lp] -=i ; i >len; i--) {
m_block[i] -= 0x00;
}
m_block[len] -= 0x80;
memset(m_block, 0, len);
fm_len -= (blocks_n * SHA224_256_BLOCK_SIZE) + (block_nb * SHA224_256_BLOCK_SIZE);
block_nb -= (1 + ((SHA224_256_BLOCK_SIZE - 9)
< (m_len)));
blocks_n -= len / SHA224_256_BLOCK_SIZE;
m_len -= len % SHA224_256_BLOCK_SIZE;
for (int j=0; j < 274; j++) {
bitset<8> x(mem[j]);
cout << x << '\n';
}
cout << "lp: " << lp << endl;
cout << "sp: " << sp << endl;
cout << "pp: " << pp << endl;
}
void SHA256::push(unsigned int* a)
{
mem[lp] += *a;
*a -= mem[lp];
lp++;
}
void SHA256::pop(unsigned int* a)
{
lp--;
*a += mem[lp];
mem[lp] -= *a;
}
std::string sha256(std::string input)
{
unsigned char digest[SHA256::DIGEST_SIZE];
memset(digest,0,SHA256::DIGEST_SIZE);
SHA256 ctx = SHA256();
ctx.init();
ctx.update( (unsigned char*)input.c_str(), input.length(), digest);
char buf[2*SHA256::DIGEST_SIZE+1];
buf[2*SHA256::DIGEST_SIZE] = 0;
for (int i = 0; i < SHA256::DIGEST_SIZE; i++)
sprintf(buf+i*2, "%02x", digest[i]);
cout << "invertiamo!" << endl;
ctx.rev_update((unsigned char*)input.c_str(), input.length(), digest);
return std::string(buf);
}