text: /* ************************************************************************** */
  /*                                                                            */
  /*                                                        :::      ::::::::   */
  /*   sha512.c                                           :+:      :+:    :+:   */
  /*                                                    +:+ +:+         +:+     */
  /*   By: aulopez <aulopez@student.42.fr>            +#+  +:+       +#+        */
  /*                                                +#+#+#+#+#+   +#+           */
  /*   Created: 2021/02/28 11:55:03 by aulopez           #+#    #+#             */
  /*   Updated: 2021/06/01 00:54:03 by aulopez          ###   ########.fr       */
  /*                                                                            */
  /* ************************************************************************** */
  
  #include <stddef.h>
  #include <stdint.h>
  #include <stdlib.h>
  #include "di_utils.h"
  
  typedef struct s_sha5xx
  {
  	size_t		chunk;
  	uint64_t	h[8];
  	uint64_t	t[8];
  }				t_sha5xx;
  
  const uint64_t	S5XX_CONST[80] =
  	{0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f
  	, 0xe9b5dba58189dbbc, 0x3956c25bf348b538, 0x59f111f1b605d019
  	, 0x923f82a4af194f9b, 0xab1c5ed5da6d8118, 0xd807aa98a3030242
  	, 0x12835b0145706fbe, 0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2
  	, 0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235
  	, 0xc19bf174cf692694, 0xe49b69c19ef14ad2, 0xefbe4786384f25e3
  	, 0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65, 0x2de92c6f592b0275
  	, 0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5
  	, 0x983e5152ee66dfab, 0xa831c66d2db43210, 0xb00327c898fb213f
  	, 0xbf597fc7beef0ee4, 0xc6e00bf33da88fc2, 0xd5a79147930aa725
  	, 0x06ca6351e003826f, 0x142929670a0e6e70, 0x27b70a8546d22ffc
  	, 0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed, 0x53380d139d95b3df
  	, 0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6
  	, 0x92722c851482353b, 0xa2bfe8a14cf10364, 0xa81a664bbc423001
  	, 0xc24b8b70d0f89791, 0xc76c51a30654be30, 0xd192e819d6ef5218
  	, 0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8
  	, 0x19a4c116b8d2d0c8, 0x1e376c085141ab53, 0x2748774cdf8eeb99
  	, 0x34b0bcb5e19b48a8, 0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb
  	, 0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3, 0x748f82ee5defb2fc
  	, 0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec
  	, 0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915
  	, 0xc67178f2e372532b, 0xca273eceea26619c, 0xd186b8c721c0c207
  	, 0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178, 0x06f067aa72176fba
  	, 0x0a637dc5a2c898a6, 0x113f9804bef90dae, 0x1b710b35131c471b
  	, 0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc
  	, 0x431d67c49c100d4c, 0x4cc5d4becb3e42b6, 0x597f299cfc657e2a
  	, 0x5fcb6fab3ad6faec, 0x6c44198c4a475817};
  
  static t_sha5xx	updatetemp(t_sha5xx ret, uint64_t t1, uint64_t t2)
  {
  	ret.t[7] = ret.t[6];
  	ret.t[6] = ret.t[5];
  	ret.t[5] = ret.t[4];
  	ret.t[4] = ret.t[3] + t1;
  	ret.t[3] = ret.t[2];
  	ret.t[2] = ret.t[1];
  	ret.t[1] = ret.t[0];
  	ret.t[0] = t1 + t2;
  	return (ret);
  }
  
  static t_sha5xx	updatehash(t_sha5xx a, uint64_t *word)
  {
  	uint64_t	urot;
  	uint64_t	uxor;
  	uint64_t	temp1;
  	uint64_t	temp2;
  
  	for (int i = 0; i < 80; i++) {
  		urot = r_64rot(a.t[4], 14) ^ r_64rot(a.t[4], 18) ^ r_64rot(a.t[4], 41);
  		uxor = (a.t[4] & a.t[5]) ^ (a.t[6] & ~a.t[4]);
  		temp1 = a.t[7] + urot + uxor + S5XX_CONST[i] + word[i];
  		urot = r_64rot(a.t[0], 28) ^ r_64rot(a.t[0], 34) ^ r_64rot(a.t[0], 39);
  		uxor = (a.t[0] & a.t[1]) ^ (a.t[0] & a.t[2]) ^ (a.t[1] & a.t[2]);
  		temp2 = urot + uxor;
  		a = updatetemp(a, temp1, temp2);
  	}
  	for (int i = 0; i < 8; i++)
  		a.h[i] += a.t[i];
  	for (int i = 0; i < 8; i++)
  		a.t[i] = a.h[i];
  	return (a);
  }
  
  static uint64_t	*fill_word(uint64_t *word, char *s)
  {
  	uint64_t	s0;
  	uint64_t	s1;
  
  	for (int i = 0; i < 80; i++)
  		word[i] = 0;
  	uint8to64(word, (uint8_t *)s, 16, 0);
  	for (int i = 16; i < 80 ; i++) {
  		s0 = r_64rot(word[i - 15], 1) ^ r_64rot(word[i - 15], 8)
  			^ (word[i - 15] >> 7);
  		s1 = r_64rot(word[i - 2], 19) ^ r_64rot(word[i - 2], 61)
  			^ (word[i - 2] >> 6);
  		word[i] = word[i - 16] + s0 + word[i - 7] + s1;
  	}
  	return (word);
  }
  
  static t_sha5xx		sha5xx_algorithm(char *s, t_sha5xx algo)
  {
  	uint64_t	word[80];
  
  	for (size_t i = 0; i < algo.chunk; i++) {
  		fill_word(word, s + i * 128);
  		algo = updatehash(algo, word);
  	}
  	return (algo);
  }
  
  static void		init(t_sha5xx *algo, size_t len, int sha)
  {
  	algo->chunk = len / 128 + ((len % 128) != 0);
  	if (sha == 512) {
  		algo->h[0] = 0x6a09e667f3bcc908;
  		algo->h[1] = 0xbb67ae8584caa73b;
  		algo->h[2] = 0x3c6ef372fe94f82b;
  		algo->h[3] = 0xa54ff53a5f1d36f1;
  		algo->h[4] = 0x510e527fade682d1;
  		algo->h[5] = 0x9b05688c2b3e6c1f;
  		algo->h[6] = 0x1f83d9abfb41bd6b;
  		algo->h[7] = 0x5be0cd19137e2179;
  	}
  	else if (sha == 512256 || sha == 512224) {
  		algo->h[0] = 0x6a09e667f3bcc908 ^ 0xa5a5a5a5a5a5a5a5;
  		algo->h[1] = 0xbb67ae8584caa73b ^ 0xa5a5a5a5a5a5a5a5;
  		algo->h[2] = 0x3c6ef372fe94f82b ^ 0xa5a5a5a5a5a5a5a5;
  		algo->h[3] = 0xa54ff53a5f1d36f1 ^ 0xa5a5a5a5a5a5a5a5;
  		algo->h[4] = 0x510e527fade682d1 ^ 0xa5a5a5a5a5a5a5a5;
  		algo->h[5] = 0x9b05688c2b3e6c1f ^ 0xa5a5a5a5a5a5a5a5;
  		algo->h[6] = 0x1f83d9abfb41bd6b ^ 0xa5a5a5a5a5a5a5a5;
  		algo->h[7] = 0x5be0cd19137e2179 ^ 0xa5a5a5a5a5a5a5a5;
  	}
  	else if (sha == 384) {
  		algo->h[0] = 0xcbbb9d5dc1059ed8;
  		algo->h[1] = 0x629a292a367cd507;
  		algo->h[2] = 0x9159015a3070dd17;
  		algo->h[3] = 0x152fecd8f70e5939;
  		algo->h[4] = 0x67332667ffc00b31;
  		algo->h[5] = 0x8eb44a8768581511;
  		algo->h[6] = 0xdb0c2e0d64f98fa7;
  		algo->h[7] = 0x47b5481dbefa4fa4;
  	}
  	for (int i = 0; i < 8; i++)
  		algo->t[i] = algo->h[i];
  }
  
  static char *sha5xx_ret(t_sha5xx *algo, int sha)
  {
  	char *ret;
  	uint8_t c;
  	int len;
  	uint64_t *tab = algo->h;
  
  	if (sha == 512)
  		len = 8;
  	else if (sha == 384)
  		len = 6;
  	else
  		len = 4;
  	ret = malloc((16 * len + 1) * sizeof(*ret));
  	if (!ret)
  		return (NULL);
  	ret[16 * len] = '\0';
  	for (int i = 0; i < len; i++) {
  		for (int j = 0; j < 16; j++) {
  			c = (tab[i] >> (60 - 4 * j)) & 0xf;
  			if (c < 10)
  				ret[i * 16 + j] = '0' + c;
  			else
  				ret[i * 16 + j] = 'a' + c - 10;
  		}
  	}
  	if (sha == 512224)
  		ret[16 * len - 8] = '\0';
  	return (ret);
  }
  
  char *sha512(char *tocrypt, size_t len)
  {
  	char *str;
  	size_t padded_len;
  	t_sha5xx	algo;
  
  	str = di_lpreprocessing(&padded_len, tocrypt, len, 0);
  	if (str == NULL)
  		return (NULL);
  	init(&algo, padded_len, 512);
  	algo = sha5xx_algorithm(str, algo);
  	free(str);
  	return (sha5xx_ret(&algo, 512));
  }
  
  char *sha384(char *tocrypt, size_t len)
  {
  	char *str;
  	size_t padded_len;
  	t_sha5xx	algo;
  
  	str = di_lpreprocessing(&padded_len, tocrypt, len, 0);
  	if (str == NULL)
  		return (NULL);
  	init(&algo, padded_len, 384);
  	algo = sha5xx_algorithm(str, algo);
  	free(str);
  	return (sha5xx_ret(&algo, 384));
  }
  
  char *sha512_256(char *tocrypt, size_t len)
  {
  	char *str;
  	size_t padded_len;
  	t_sha5xx	algo;
  	char		tmp[11] = "SHA-512/256";
  
  	str = di_lpreprocessing(&padded_len, (char *)tmp, 11, 0);
  	if (str == NULL)
  		return (NULL);
  	init(&algo, padded_len, 512256);
  	algo = sha5xx_algorithm(str, algo);
  	free(str);
  	str = di_lpreprocessing(&padded_len, tocrypt, len, 0);
  	if (str == NULL)
  		return (NULL);
  	algo.chunk = (len + 17) / 128 + (((len + 17) % 128) != 0);
  	algo = sha5xx_algorithm(str, algo);
  	free(str);
  	return(sha5xx_ret(&algo, 512256));
  }
  
  char *sha512_224(char *tocrypt, size_t len)
  {
  	char *str;
  	size_t padded_len;
  	t_sha5xx	algo;
  	char		tmp[11] = "SHA-512/224";
  
  	str = di_lpreprocessing(&padded_len, (char *)tmp, 11, 0);
  	if (str == NULL)
  		return (NULL);
  	init(&algo, padded_len, 512224);
  	algo = sha5xx_algorithm(str, algo);
  	free(str);
  	str = di_lpreprocessing(&padded_len, tocrypt, len, 0);
  	if (str == NULL)
  		return (NULL);
  	algo.chunk = (len + 17) / 128 + (((len + 17) % 128) != 0);
  	algo = sha5xx_algorithm(str, algo);
  	free(str);
  	return(sha5xx_ret(&algo, 512224));
  }
  