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diff --git a/src/lib/libcrypto/evp/p5_crpt2.c b/src/lib/libcrypto/evp/p5_crpt2.c
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1/* $OpenBSD: p5_crpt2.c,v 1.20 2015/02/14 15:49:51 miod Exp $ */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 1999.
4 */
5/* ====================================================================
6 * Copyright (c) 1999-2006 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62
63#include <openssl/opensslconf.h>
64
65#if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA)
66
67#include <openssl/err.h>
68#include <openssl/evp.h>
69#include <openssl/hmac.h>
70#include <openssl/x509.h>
71
72#include "evp_locl.h"
73
74/* This is an implementation of PKCS#5 v2.0 password based encryption key
75 * derivation function PBKDF2.
76 * SHA1 version verified against test vectors posted by Peter Gutmann
77 * <pgut001@cs.auckland.ac.nz> to the PKCS-TNG <pkcs-tng@rsa.com> mailing list.
78 */
79
80int
81PKCS5_PBKDF2_HMAC(const char *pass, int passlen, const unsigned char *salt,
82 int saltlen, int iter, const EVP_MD *digest, int keylen, unsigned char *out)
83{
84 unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
85 int cplen, j, k, tkeylen, mdlen;
86 unsigned long i = 1;
87 HMAC_CTX hctx_tpl, hctx;
88
89 mdlen = EVP_MD_size(digest);
90 if (mdlen < 0)
91 return 0;
92
93 HMAC_CTX_init(&hctx_tpl);
94 p = out;
95 tkeylen = keylen;
96 if (!pass)
97 passlen = 0;
98 else if (passlen == -1)
99 passlen = strlen(pass);
100 if (!HMAC_Init_ex(&hctx_tpl, pass, passlen, digest, NULL)) {
101 HMAC_CTX_cleanup(&hctx_tpl);
102 return 0;
103 }
104 while (tkeylen) {
105 if (tkeylen > mdlen)
106 cplen = mdlen;
107 else
108 cplen = tkeylen;
109 /* We are unlikely to ever use more than 256 blocks (5120 bits!)
110 * but just in case...
111 */
112 itmp[0] = (unsigned char)((i >> 24) & 0xff);
113 itmp[1] = (unsigned char)((i >> 16) & 0xff);
114 itmp[2] = (unsigned char)((i >> 8) & 0xff);
115 itmp[3] = (unsigned char)(i & 0xff);
116 if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) {
117 HMAC_CTX_cleanup(&hctx_tpl);
118 return 0;
119 }
120 if (!HMAC_Update(&hctx, salt, saltlen) ||
121 !HMAC_Update(&hctx, itmp, 4) ||
122 !HMAC_Final(&hctx, digtmp, NULL)) {
123 HMAC_CTX_cleanup(&hctx_tpl);
124 HMAC_CTX_cleanup(&hctx);
125 return 0;
126 }
127 HMAC_CTX_cleanup(&hctx);
128 memcpy(p, digtmp, cplen);
129 for (j = 1; j < iter; j++) {
130 if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) {
131 HMAC_CTX_cleanup(&hctx_tpl);
132 return 0;
133 }
134 if (!HMAC_Update(&hctx, digtmp, mdlen) ||
135 !HMAC_Final(&hctx, digtmp, NULL)) {
136 HMAC_CTX_cleanup(&hctx_tpl);
137 HMAC_CTX_cleanup(&hctx);
138 return 0;
139 }
140 HMAC_CTX_cleanup(&hctx);
141 for (k = 0; k < cplen; k++)
142 p[k] ^= digtmp[k];
143 }
144 tkeylen -= cplen;
145 i++;
146 p += cplen;
147 }
148 HMAC_CTX_cleanup(&hctx_tpl);
149 return 1;
150}
151
152int
153PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen, const unsigned char *salt,
154 int saltlen, int iter, int keylen, unsigned char *out)
155{
156 return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter,
157 EVP_sha1(), keylen, out);
158}
159
160/* Now the key derivation function itself. This is a bit evil because
161 * it has to check the ASN1 parameters are valid: and there are quite a
162 * few of them...
163 */
164
165int
166PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
167 ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md, int en_de)
168{
169 const unsigned char *pbuf;
170 int plen;
171 PBE2PARAM *pbe2 = NULL;
172 const EVP_CIPHER *cipher;
173
174 int rv = 0;
175
176 if (param == NULL || param->type != V_ASN1_SEQUENCE ||
177 param->value.sequence == NULL) {
178 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
179 goto err;
180 }
181
182 pbuf = param->value.sequence->data;
183 plen = param->value.sequence->length;
184 if (!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
185 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
186 goto err;
187 }
188
189 /* See if we recognise the key derivation function */
190
191 if (OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
192 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
193 EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
194 goto err;
195 }
196
197 /* lets see if we recognise the encryption algorithm.
198 */
199
200 cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
201
202 if (!cipher) {
203 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
204 EVP_R_UNSUPPORTED_CIPHER);
205 goto err;
206 }
207
208 /* Fixup cipher based on AlgorithmIdentifier */
209 if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
210 goto err;
211 if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
212 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
213 EVP_R_CIPHER_PARAMETER_ERROR);
214 goto err;
215 }
216 rv = PKCS5_v2_PBKDF2_keyivgen(ctx, pass, passlen,
217 pbe2->keyfunc->parameter, c, md, en_de);
218
219err:
220 PBE2PARAM_free(pbe2);
221 return rv;
222}
223
224int
225PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
226 ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md, int en_de)
227{
228 unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
229 const unsigned char *pbuf;
230 int saltlen, iter, plen;
231 int rv = 0;
232 unsigned int keylen = 0;
233 int prf_nid, hmac_md_nid;
234 PBKDF2PARAM *kdf = NULL;
235 const EVP_MD *prfmd;
236
237 if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
238 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_NO_CIPHER_SET);
239 return 0;
240 }
241 keylen = EVP_CIPHER_CTX_key_length(ctx);
242 if (keylen > sizeof key) {
243 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_BAD_KEY_LENGTH);
244 return 0;
245 }
246
247 /* Decode parameter */
248
249 if (!param || (param->type != V_ASN1_SEQUENCE)) {
250 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
251 return 0;
252 }
253
254 pbuf = param->value.sequence->data;
255 plen = param->value.sequence->length;
256
257 if (!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
258 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
259 return 0;
260 }
261
262 /* Now check the parameters of the kdf */
263
264 if (kdf->keylength &&
265 (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)){
266 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
267 EVP_R_UNSUPPORTED_KEYLENGTH);
268 goto err;
269 }
270
271 if (kdf->prf)
272 prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
273 else
274 prf_nid = NID_hmacWithSHA1;
275
276 if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
277 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
278 goto err;
279 }
280
281 prfmd = EVP_get_digestbynid(hmac_md_nid);
282 if (prfmd == NULL) {
283 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
284 goto err;
285 }
286
287 if (kdf->salt->type != V_ASN1_OCTET_STRING) {
288 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
289 EVP_R_UNSUPPORTED_SALT_TYPE);
290 goto err;
291 }
292
293 /* it seems that its all OK */
294 salt = kdf->salt->value.octet_string->data;
295 saltlen = kdf->salt->value.octet_string->length;
296 iter = ASN1_INTEGER_get(kdf->iter);
297 if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
298 keylen, key))
299 goto err;
300 rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
301
302err:
303 OPENSSL_cleanse(key, keylen);
304 PBKDF2PARAM_free(kdf);
305 return rv;
306}
307
308#endif
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