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/*
* Copyright (c) 2006 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
RCSID("$Id: pkcs5.c,v 1.1 2006/02/28 14:16:57 lha Exp $");
#include <stdio.h>
#include <stdlib.h>
#include <evp.h>
#include <hmac.h>
#include <roken.h>
int
PKCS5_PBKDF2_HMAC_SHA1(const void * password, size_t password_len,
const void * salt, size_t salt_len,
unsigned long iter,
size_t keylen, void *key)
{
size_t datalen, leftofkey, checksumsize;
char *data, *tmpcksum;
u_int32_t keypart;
const EVP_MD *md;
unsigned long i;
int j;
char *p;
unsigned int hmacsize;
md = EVP_sha1();
checksumsize = EVP_MD_size(md);
datalen = salt_len + 4;
tmpcksum = malloc(checksumsize + datalen);
if (tmpcksum == NULL)
return 0;
data = &tmpcksum[checksumsize];
memcpy(data, salt, salt_len);
keypart = 1;
leftofkey = keylen;
p = key;
while (leftofkey) {
int len;
if (leftofkey > checksumsize)
len = checksumsize;
else
len = leftofkey;
data[datalen - 4] = (keypart >> 24) & 0xff;
data[datalen - 3] = (keypart >> 16) & 0xff;
data[datalen - 2] = (keypart >> 8) & 0xff;
data[datalen - 1] = (keypart) & 0xff;
HMAC(md, password, password_len, data, datalen,
tmpcksum, &hmacsize);
memcpy(p, tmpcksum, len);
for (i = 1; i < iter; i++) {
HMAC(md, password, password_len, tmpcksum, checksumsize,
tmpcksum, &hmacsize);
for (j = 0; j < len; j++)
p[j] ^= tmpcksum[j];
}
p += len;
leftofkey -= len;
keypart++;
}
free(tmpcksum);
return 1;
}
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