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/*
*
* Connection Manager
*
* Copyright (C) 2012 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 <glib.h>
#include "src/shared/sha1.h"
#define SHA1_MAC_LEN 20
static void __hmac_sha1(GChecksum *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[SHA1_MAC_LEN];
size_t length;
int i;
/* if key is longer than 64 bytes reset it to key=SHA1(key) */
if (key_len > 64) {
g_checksum_update(checksum, key, key_len);
length = sizeof(digest);
g_checksum_get_digest(checksum, digest, &length);
g_checksum_reset(checksum);
key = digest;
key_len = SHA1_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 SHA1 */
g_checksum_update(checksum, ipad, sizeof(ipad));
g_checksum_update(checksum, data, data_len);
length = sizeof(digest);
g_checksum_get_digest(checksum, digest, &length);
g_checksum_reset(checksum);
/* perform outer SHA1 */
g_checksum_update(checksum, opad, sizeof(opad));
g_checksum_update(checksum, digest, length);
length = sizeof(digest);
g_checksum_get_digest(checksum, output, &length);
g_checksum_reset(checksum);
}
int hmac_sha1(const void *key, size_t key_len,
const void *data, size_t data_len, void *output, size_t size)
{
GChecksum *checksum;
checksum = g_checksum_new(G_CHECKSUM_SHA1);
__hmac_sha1(checksum, key, key_len, data, data_len, output);
g_checksum_free(checksum);
return 0;
}
static void F(GChecksum *checksum, const char *password, size_t password_len,
const char *salt, size_t salt_len,
unsigned int iterations, unsigned int count,
unsigned char *digest)
{
unsigned char tmp1[SHA1_MAC_LEN];
unsigned char tmp2[SHA1_MAC_LEN];
unsigned char buf[36];
unsigned int i, j;
memcpy(buf, salt, salt_len);
buf[salt_len + 0] = (count >> 24) & 0xff;
buf[salt_len + 1] = (count >> 16) & 0xff;
buf[salt_len + 2] = (count >> 8) & 0xff;
buf[salt_len + 3] = count & 0xff;
__hmac_sha1(checksum, password, password_len,
buf, salt_len + 4, tmp1);
memcpy(digest, tmp1, SHA1_MAC_LEN);
for (i = 1; i < iterations; i++) {
__hmac_sha1(checksum, password, password_len,
tmp1, SHA1_MAC_LEN, tmp2);
memcpy(tmp1, tmp2, SHA1_MAC_LEN);
for (j = 0; j < SHA1_MAC_LEN; j++)
digest[j] ^= tmp2[j];
}
}
int pbkdf2_sha1(const void *password, size_t password_len,
const void *salt, size_t salt_len,
unsigned int iterations, void *output, size_t size)
{
GChecksum *checksum;
unsigned char *ptr = output;
unsigned char digest[SHA1_MAC_LEN];
unsigned int i;
checksum = g_checksum_new(G_CHECKSUM_SHA1);
for (i = 1; size > 0; i++) {
size_t len;
F(checksum, password, password_len, salt, salt_len,
iterations, i, digest);
len = size > SHA1_MAC_LEN ? SHA1_MAC_LEN : size;
memcpy(ptr, digest, len);
ptr += len;
size -= len;
}
g_checksum_free(checksum);
return 0;
}
int prf_sha1(const void *key, size_t key_len,
const void *prefix, size_t prefix_len,
const void *data, size_t data_len, void *output, size_t size)
{
GChecksum *checksum;
unsigned char input[1024];
size_t input_len;
unsigned int i, offset = 0;
checksum = g_checksum_new(G_CHECKSUM_SHA1);
memcpy(input, prefix, prefix_len);
input[prefix_len] = 0;
memcpy(input + prefix_len + 1, data, data_len);
input[prefix_len + 1 + data_len] = 0;
input_len = prefix_len + 1 + data_len + 1;
for (i = 0; i < (size + 19) / 20; i++) {
__hmac_sha1(checksum, key, key_len, input, input_len,
output + offset);
offset += 20;
input[input_len - 1]++;
}
g_checksum_free(checksum);
return 0;
}
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