Refactoring md5 to generalize message digest

1 files changed, 47 insertions, 0 deletions

diff --git a/src/message_digest.c b/src/message_digest.c
new file mode 100644
index 0000000..b08022f
--- /dev/null
+++ b/src/message_digest.c
@@ -0,0 +1,47 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   message_digest.c                                   :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: charles <me@cacharle.xyz>                  +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/08/01 15:03:39 by charles           #+#    #+#             */
+/*   Updated: 2020/08/01 19:25:07 by charles          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "ft_ssl.h"
+
+char	*message_digest(t_message_digest_param *param)
+{
+	size_t		i;
+	uint64_t	padding_size;
+	uint8_t		*message;
+
+	padding_size = (64 - (param->size + 8) % 64) + 8;
+
+	message = malloc(param->size + padding_size);
+	if (message == NULL)
+		return (NULL);
+	ft_memcpy(message, param->message, param->size);
+	ft_memset(message + param->size, 0x0, padding_size);
+
+	message[param->size] |= 1 << 7;
+	*((uint64_t*)(message + param->size + padding_size - sizeof(uint64_t))) =
+		(uint64_t)param->size * 8;
+	param->size += padding_size;
+
+	i = 0;
+	while (i < param->size)
+	{
+		param->compression_state = param->compression_func(param->compression_state, message + i);
+		if (param->compression_state == NULL)
+		{
+			free(message);
+			return (NULL);
+		}
+		i += param->chunk_size;
+	}
+
+	return (bytes_to_str(param->compression_state, param->compression_state_size));
+}