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
PKCS5_PBKDF2_HMAC(const char * password,int password_len,const uint8_t * salt,size_t salt_len,unsigned iterations,const EVP_MD * digest,size_t key_len,uint8_t * out_key)61 int 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
PKCS5_PBKDF2_HMAC_SHA1(const char * password,int password_len,const uint8_t * salt,size_t salt_len,unsigned iterations,size_t key_len,uint8_t * out_key)134 int 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