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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* sha1.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <me@cacharle.xyz> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/08/02 14:20:39 by charles #+# #+# */
/* Updated: 2020/08/03 12:10:55 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "ft_ssl.h"
void *sha1_compression_func(void *v_state, uint8_t *chunk)
{
uint32_t buf[80] = {0};
size_t i;
uint32_t a, b, c, d, e, f, k, tmp;
uint32_t *state;
for (i = 0; i < 16; i++)
buf[i] = reverse_bytes32(((uint32_t*)chunk)[i]);
i = 16;
while (i < 80)
{
buf[i] = rotate_left(buf[i - 3] ^ buf[i - 8] ^ buf[i - 14] ^ buf[i - 16], 1);
i++;
}
state = v_state;
a = state[0];
b = state[1];
c = state[2];
d = state[3];
e = state[4];
i = 0;
while (i < 80)
{
if (i < 20)
{
f = (b & c) | ((~b) & d);
k = 0x5a827999;
}
else if (i < 40)
{
f = b ^ c ^ d;
k = 0x6ed9eba1;
}
else if (i < 60)
{
f = (b & c) | (b & d) | (c & d);
k = 0x8f1bbcdc;
}
else
{
f = b ^ c ^ d;
k = 0xca62c1d6;
}
tmp = rotate_left(a, 5) + f + e + k + buf[i];
e = d;
d = c;
c = rotate_left(b, 30);
b = a;
a = tmp;
i++;
}
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
return (state);
}
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