ft_sha256.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_sha256.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kdenisov <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/06/13 10:57:25 by kdenisov          #+#    #+#             */
/*   Updated: 2019/06/13 10:57:28 by kdenisov         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "ft_ssl.h"

const unsigned	g_k[64] = {
	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
};

unsigned	*sha256_update(t_fsha *fsh, unsigned *w)
{
	int i;

	i = 0;
	while (i < 16)
	{
		w[i] = revers_bits(w[i]);
		i++;
	}
	while (i < fsh->round)
	{
		fsh->s[0] = rotr(w[i - 15], 7) ^ rotr(w[i - 15], 18) ^ (w[i - 15] >> 3);
		fsh->s[1] = rotr(w[i - 2], 17) ^ rotr(w[i - 2], 19) ^ (w[i - 2] >> 10);
		w[i] = w[i - 16] + fsh->s[0] + w[i - 7] + fsh->s[1];
		i++;
	}
	return (w);
}

void		sha256_rounds(t_fsha *fsh, t_alp *al, unsigned *w)
{
	int			i;

	i = 0;
	while (i < fsh->round)
	{
		fsh->s[1] = rotr(al->e, 6) ^ rotr(al->e, 11) ^ rotr(al->e, 25);
		fsh->ch = (al->e & al->f) ^ (~al->e & al->g);
		fsh->tmp1 = al->h + fsh->s[1] + fsh->ch + g_k[i] + w[i];
		fsh->s[0] = rotr(al->a, 2) ^ rotr(al->a, 13) ^ rotr(al->a, 22);
		fsh->maj = (al->a & al->b) ^ (al->a & al->c) ^ (al->b & al->c);
		fsh->tmp2 = fsh->s[0] + fsh->maj;
		al->h = al->g;
		al->g = al->f;
		al->f = al->e;
		al->e = al->d + fsh->tmp1;
		al->d = al->c;
		al->c = al->b;
		al->b = al->a;
		al->a = fsh->tmp1 + fsh->tmp2;
		i++;
	}
}

void		sha256_stages(t_fsha *fsh, t_alp *al, unsigned *w)
{
	sha256_update(fsh, w);
	al->a = fsh->hash[0];
	al->b = fsh->hash[1];
	al->c = fsh->hash[2];
	al->d = fsh->hash[3];
	al->e = fsh->hash[4];
	al->f = fsh->hash[5];
	al->g = fsh->hash[6];
	al->h = fsh->hash[7];
	sha256_rounds(fsh, al, w);
	fsh->hash[0] += al->a;
	fsh->hash[1] += al->b;
	fsh->hash[2] += al->c;
	fsh->hash[3] += al->d;
	fsh->hash[4] += al->e;
	fsh->hash[5] += al->f;
	fsh->hash[6] += al->g;
	fsh->hash[7] += al->h;
}

char		*get_block_sha256(t_fsha *fsh, t_alp *al, char *arg)
{
	unsigned	*w;

	while (fsh->len >= BLOCK_SIZE - 8)
	{
		w = ft_memalloc(sizeof(unsigned int) * 64);
		if (fsh->len < BLOCK_SIZE)
		{
			ft_memset(w, 0, sizeof(w));
			ft_memcpy(w, arg, fsh->len);
			((char *)w)[fsh->len] = 0x80;
			sha256_stages(fsh, al, w);
			arg = arg + fsh->len;
			fsh->len = -1;
		}
		else
		{
			ft_memcpy(w, arg, BLOCK_SIZE);
			sha256_stages(fsh, al, w);
			arg = arg + BLOCK_SIZE;
			fsh->len = fsh->len - BLOCK_SIZE;
		}
		free(w);
	}
	return (arg);
}