1/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
2 * project 1999.
3 */
4/* ====================================================================
5 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in
16 *    the documentation and/or other materials provided with the
17 *    distribution.
18 *
19 * 3. All advertising materials mentioning features or use of this
20 *    software must display the following acknowledgment:
21 *    "This product includes software developed by the OpenSSL Project
22 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
23 *
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 *    endorse or promote products derived from this software without
26 *    prior written permission. For written permission, please contact
27 *    licensing@OpenSSL.org.
28 *
29 * 5. Products derived from this software may not be called "OpenSSL"
30 *    nor may "OpenSSL" appear in their names without prior written
31 *    permission of the OpenSSL Project.
32 *
33 * 6. Redistributions of any form whatsoever must retain the following
34 *    acknowledgment:
35 *    "This product includes software developed by the OpenSSL Project
36 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
51 *
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com).  This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com). */
55
56#include <openssl/evp.h>
57
58#include <openssl/hmac.h>
59
60
61int PKCS5_PBKDF2_HMAC(const char *password, int password_len,
62                      const uint8_t *salt, size_t salt_len, unsigned iterations,
63                      const EVP_MD *digest, size_t key_len, uint8_t *out_key) {
64  uint8_t digest_tmp[EVP_MAX_MD_SIZE], *p, itmp[4];
65  size_t cplen, mdlen, tkeylen, k;
66  unsigned j;
67  uint32_t i = 1;
68  HMAC_CTX hctx_tpl, hctx;
69
70  mdlen = EVP_MD_size(digest);
71  HMAC_CTX_init(&hctx_tpl);
72  p = out_key;
73  tkeylen = key_len;
74  if (password == NULL) {
75    password_len = 0;
76  } else if (password_len == -1) {
77    /* TODO(fork): remove this hack. The OpenSSL code took the strlen when the
78     * length is given as -1. */
79    password_len = strlen(password);
80  }
81  if (!HMAC_Init_ex(&hctx_tpl, password, password_len, digest, NULL)) {
82    HMAC_CTX_cleanup(&hctx_tpl);
83    return 0;
84  }
85  while (tkeylen) {
86    if (tkeylen > mdlen) {
87      cplen = mdlen;
88    } else {
89      cplen = tkeylen;
90    }
91    /* We are unlikely to ever use more than 256 blocks (5120 bits!)
92     * but just in case... */
93    itmp[0] = (uint8_t)((i >> 24) & 0xff);
94    itmp[1] = (uint8_t)((i >> 16) & 0xff);
95    itmp[2] = (uint8_t)((i >> 8) & 0xff);
96    itmp[3] = (uint8_t)(i & 0xff);
97    if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) {
98      HMAC_CTX_cleanup(&hctx_tpl);
99      return 0;
100    }
101    if (!HMAC_Update(&hctx, salt, salt_len) ||
102        !HMAC_Update(&hctx, itmp, 4) ||
103        !HMAC_Final(&hctx, digest_tmp, NULL)) {
104      HMAC_CTX_cleanup(&hctx_tpl);
105      HMAC_CTX_cleanup(&hctx);
106      return 0;
107    }
108    HMAC_CTX_cleanup(&hctx);
109    memcpy(p, digest_tmp, cplen);
110    for (j = 1; j < iterations; j++) {
111      if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) {
112        HMAC_CTX_cleanup(&hctx_tpl);
113        return 0;
114      }
115      if (!HMAC_Update(&hctx, digest_tmp, mdlen) ||
116          !HMAC_Final(&hctx, digest_tmp, NULL)) {
117        HMAC_CTX_cleanup(&hctx_tpl);
118        HMAC_CTX_cleanup(&hctx);
119        return 0;
120      }
121      HMAC_CTX_cleanup(&hctx);
122      for (k = 0; k < cplen; k++) {
123        p[k] ^= digest_tmp[k];
124      }
125    }
126    tkeylen -= cplen;
127    i++;
128    p += cplen;
129  }
130  HMAC_CTX_cleanup(&hctx_tpl);
131  return 1;
132}
133
134int PKCS5_PBKDF2_HMAC_SHA1(const char *password, int password_len,
135                           const uint8_t *salt, size_t salt_len,
136                           unsigned iterations, size_t key_len,
137                           uint8_t *out_key) {
138  return PKCS5_PBKDF2_HMAC(password, password_len, salt, salt_len, iterations,
139                           EVP_sha1(), key_len, out_key);
140}
141