1 files changed, 80 insertions, 0 deletions
diff --git a/src/sha1.c b/src/sha1.c
new file mode 100644
index 0000000..12369e8
--- /dev/null
+++ b/src/sha1.c
@@ -0,0 +1,80 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   sha1.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: charles <me@cacharle.xyz>                  +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/08/02 14:20:39 by charles           #+#    #+#             */
+/*   Updated: 2020/08/02 15:42:51 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] = chunk[i * 4] << 24;
+		buf[i] |= chunk[i * 4 + 1] << 16;
+		buf[i] |= chunk[i * 4 + 2] << 8;
+		buf[i] |= chunk[i * 4 + 3];
+	}
+	/* ft_memcpy(buf, chunk, 64); */
+	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);
+}