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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* md5.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/02/22 07:20:07 by cacharle #+# #+# */
/* Updated: 2020/08/02 09:25:59 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "ft_ssl.h"
/*
** | bits | bytes |
** |------|-------|
** | 8 | 1 |
** | 16 | 2 |
** | 32 | 4 |
** | 64 | 8 |
** | 128 | 16 |
** | 256 | 32 |
** | 512 | 64 |
**
** | 448 | 56 |
*/
static const int g_shifts_table[64] = {
7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, // 0..15
5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, // 16..31
4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, // 32..47
6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, // 48..63
};
static const uint32_t g_sin_table[64] = {
0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, // 0.. 3
0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, // 4.. 7
0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, // 8..11
0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, // 12..15
0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, // 16..19
0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, // 20..23
0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, // 24..27
0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, // 28..31
0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, // 32..35
0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, // 36..39
0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, // 40..43
0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, // 44..47
0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, // 48..51
0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, // 52..55
0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, // 56..59
0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391, // 60..63
};
void *md5_compression_func(void *v_state, uint8_t *chunk)
{
int g;
int i;
uint32_t a, b, c, d, f;
uint32_t *state;
state = v_state;
a = state[0];
b = state[1];
c = state[2];
d = state[3];
i = -1;
while (++i < 64)
{
if (i < 16)
{
f = (b & c) | ((~b) & d);
g = i;
}
else if (i < 32)
{
f = (b & d) | (c & (~d));
g = (5 * i + 1) % 16;
}
else if (i < 48)
{
f = b ^ c ^ d;
g = (3 * i + 5) % 16;
}
else
{
f = c ^ (b | ~d);
g = (7 * i) % 16;
}
f += a + g_sin_table[i] + ((uint32_t*)chunk)[g];
a = d;
d = c;
c = b;
b += rotate_left(f, g_shifts_table[i]);
}
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
return (state);
}
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