2 * Copyright (c) 2006 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 #include <krb5-types.h>
53 * As descriped in PKCS5, convert a password, salt, and iteration counter into a crypto key.
55 * @param password Password.
56 * @param password_len Length of password.
58 * @param salt_len Length of salt.
59 * @param iter iteration counter.
60 * @param keylen the output key length.
61 * @param key the output key.
63 * @return 1 on success, non 1 on failure.
65 * @ingroup hcrypto_misc
69 PKCS5_PBKDF2_HMAC_SHA1(const void * password, size_t password_len,
70 const void * salt, size_t salt_len,
72 size_t keylen, void *key)
74 size_t datalen, leftofkey, checksumsize;
75 char *data, *tmpcksum;
81 unsigned int hmacsize;
84 checksumsize = EVP_MD_size(md);
85 datalen = salt_len + 4;
87 tmpcksum = malloc(checksumsize + datalen);
91 data = &tmpcksum[checksumsize];
93 memcpy(data, salt, salt_len);
102 if (leftofkey > checksumsize)
107 data[datalen - 4] = (keypart >> 24) & 0xff;
108 data[datalen - 3] = (keypart >> 16) & 0xff;
109 data[datalen - 2] = (keypart >> 8) & 0xff;
110 data[datalen - 1] = (keypart) & 0xff;
112 HMAC(md, password, password_len, data, datalen,
113 tmpcksum, &hmacsize);
115 memcpy(p, tmpcksum, len);
116 for (i = 1; i < iter; i++) {
117 HMAC(md, password, password_len, tmpcksum, checksumsize,
118 tmpcksum, &hmacsize);
120 for (j = 0; j < len; j++)