94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/*
|
|
*
|
|
* Wireless daemon for Linux
|
|
*
|
|
* Copyright (C) 2013-2014 Intel Corporation. All rights reserved.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#include <string.h>
|
|
#include <ell/ell.h>
|
|
|
|
#include "src/md5.h"
|
|
|
|
#define MD5_MAC_LEN 16
|
|
|
|
static void __hmac_md5(struct l_checksum *checksum,
|
|
const void *key, size_t key_len,
|
|
const void *data, size_t data_len, void *output)
|
|
{
|
|
unsigned char ipad[64];
|
|
unsigned char opad[64];
|
|
unsigned char digest[MD5_MAC_LEN];
|
|
int i;
|
|
|
|
/* if key is longer than 64 bytes reset it to key=MD5(key) */
|
|
if (key_len > 64) {
|
|
l_checksum_update(checksum, key, key_len);
|
|
l_checksum_get_digest(checksum, digest, MD5_MAC_LEN);
|
|
|
|
l_checksum_reset(checksum);
|
|
|
|
key = digest;
|
|
key_len = MD5_MAC_LEN;
|
|
}
|
|
|
|
/* start out by storing key in pads */
|
|
memset(ipad, 0, sizeof(ipad));
|
|
memset(opad, 0, sizeof(opad));
|
|
memcpy(ipad, key, key_len);
|
|
memcpy(opad, key, key_len);
|
|
|
|
/* XOR key with ipad and opad values */
|
|
for (i = 0; i < 64; i++) {
|
|
ipad[i] ^= 0x36;
|
|
opad[i] ^= 0x5c;
|
|
}
|
|
|
|
/* perform inner MD5 */
|
|
l_checksum_update(checksum, ipad, sizeof(ipad));
|
|
l_checksum_update(checksum, data, data_len);
|
|
l_checksum_get_digest(checksum, digest, MD5_MAC_LEN);
|
|
|
|
l_checksum_reset(checksum);
|
|
|
|
/* perform outer MD5 */
|
|
l_checksum_update(checksum, opad, sizeof(opad));
|
|
l_checksum_update(checksum, digest, MD5_MAC_LEN);
|
|
l_checksum_get_digest(checksum, output, MD5_MAC_LEN);
|
|
|
|
l_checksum_reset(checksum);
|
|
}
|
|
|
|
bool hmac_md5(const void *key, size_t key_len,
|
|
const void *data, size_t data_len, void *output, size_t size)
|
|
{
|
|
struct l_checksum *checksum;
|
|
|
|
checksum = l_checksum_new(L_CHECKSUM_MD5);
|
|
|
|
__hmac_md5(checksum, key, key_len, data, data_len, output);
|
|
|
|
l_checksum_free(checksum);
|
|
|
|
return true;
|
|
}
|