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authorcvs2svn <admin@example.com>2014-02-27 21:04:58 +0000
committercvs2svn <admin@example.com>2014-02-27 21:04:58 +0000
commit726818f36b5221c023cd04c4b90bdbc08e94cd96 (patch)
treecf8221f3aa5bf5a578ddf1ecf5677ad08c04d342 /src/lib/libcrypto/evp/p5_crpt2.c
parent3b6d92e82b1421b811bcdec7f7fdfb31eeef18de (diff)
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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/* p5_crpt2.c */
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#include <stdio.h>
59#include <stdlib.h>
60#include "cryptlib.h"
61#if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA)
62#include <openssl/x509.h>
63#include <openssl/evp.h>
64#include <openssl/hmac.h>
65#include "evp_locl.h"
66
67/* set this to print out info about the keygen algorithm */
68/* #define DEBUG_PKCS5V2 */
69
70#ifdef DEBUG_PKCS5V2
71 static void h__dump (const unsigned char *p, int len);
72#endif
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 PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
81 const unsigned char *salt, int saltlen, int iter,
82 const EVP_MD *digest,
83 int keylen, unsigned char *out)
84 {
85 unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
86 int cplen, j, k, tkeylen, mdlen;
87 unsigned long i = 1;
88 HMAC_CTX hctx;
89
90 mdlen = EVP_MD_size(digest);
91 if (mdlen < 0)
92 return 0;
93
94 HMAC_CTX_init(&hctx);
95 p = out;
96 tkeylen = keylen;
97 if(!pass)
98 passlen = 0;
99 else if(passlen == -1)
100 passlen = strlen(pass);
101 while(tkeylen)
102 {
103 if(tkeylen > mdlen)
104 cplen = mdlen;
105 else
106 cplen = tkeylen;
107 /* We are unlikely to ever use more than 256 blocks (5120 bits!)
108 * but just in case...
109 */
110 itmp[0] = (unsigned char)((i >> 24) & 0xff);
111 itmp[1] = (unsigned char)((i >> 16) & 0xff);
112 itmp[2] = (unsigned char)((i >> 8) & 0xff);
113 itmp[3] = (unsigned char)(i & 0xff);
114 if (!HMAC_Init_ex(&hctx, pass, passlen, digest, NULL)
115 || !HMAC_Update(&hctx, salt, saltlen)
116 || !HMAC_Update(&hctx, itmp, 4)
117 || !HMAC_Final(&hctx, digtmp, NULL))
118 {
119 HMAC_CTX_cleanup(&hctx);
120 return 0;
121 }
122 memcpy(p, digtmp, cplen);
123 for(j = 1; j < iter; j++)
124 {
125 HMAC(digest, pass, passlen,
126 digtmp, mdlen, digtmp, NULL);
127 for(k = 0; k < cplen; k++)
128 p[k] ^= digtmp[k];
129 }
130 tkeylen-= cplen;
131 i++;
132 p+= cplen;
133 }
134 HMAC_CTX_cleanup(&hctx);
135#ifdef DEBUG_PKCS5V2
136 fprintf(stderr, "Password:\n");
137 h__dump (pass, passlen);
138 fprintf(stderr, "Salt:\n");
139 h__dump (salt, saltlen);
140 fprintf(stderr, "Iteration count %d\n", iter);
141 fprintf(stderr, "Key:\n");
142 h__dump (out, keylen);
143#endif
144 return 1;
145 }
146
147int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
148 const unsigned char *salt, int saltlen, int iter,
149 int keylen, unsigned char *out)
150 {
151 return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
152 keylen, out);
153 }
154
155#ifdef DO_TEST
156main()
157{
158 unsigned char out[4];
159 unsigned char salt[] = {0x12, 0x34, 0x56, 0x78};
160 PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
161 fprintf(stderr, "Out %02X %02X %02X %02X\n",
162 out[0], out[1], out[2], out[3]);
163}
164
165#endif
166
167/* Now the key derivation function itself. This is a bit evil because
168 * it has to check the ASN1 parameters are valid: and there are quite a
169 * few of them...
170 */
171
172int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
173 ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md,
174 int en_de)
175{
176 const unsigned char *pbuf;
177 int plen;
178 PBE2PARAM *pbe2 = NULL;
179 const EVP_CIPHER *cipher;
180
181 int rv = 0;
182
183 if (param == NULL || param->type != V_ASN1_SEQUENCE ||
184 param->value.sequence == NULL) {
185 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
186 goto err;
187 }
188
189 pbuf = param->value.sequence->data;
190 plen = param->value.sequence->length;
191 if(!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
192 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
193 goto err;
194 }
195
196 /* See if we recognise the key derivation function */
197
198 if(OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
199 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
200 EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
201 goto err;
202 }
203
204 /* lets see if we recognise the encryption algorithm.
205 */
206
207 cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
208
209 if(!cipher) {
210 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
211 EVP_R_UNSUPPORTED_CIPHER);
212 goto err;
213 }
214
215 /* Fixup cipher based on AlgorithmIdentifier */
216 if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
217 goto err;
218 if(EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
219 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
220 EVP_R_CIPHER_PARAMETER_ERROR);
221 goto err;
222 }
223 rv = PKCS5_v2_PBKDF2_keyivgen(ctx, pass, passlen,
224 pbe2->keyfunc->parameter, c, md, en_de);
225 err:
226 PBE2PARAM_free(pbe2);
227 return rv;
228}
229
230int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
231 ASN1_TYPE *param,
232 const EVP_CIPHER *c, const EVP_MD *md, int en_de)
233{
234 unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
235 const unsigned char *pbuf;
236 int saltlen, iter, plen;
237 int rv = 0;
238 unsigned int keylen = 0;
239 int prf_nid, hmac_md_nid;
240 PBKDF2PARAM *kdf = NULL;
241 const EVP_MD *prfmd;
242
243 if (EVP_CIPHER_CTX_cipher(ctx) == NULL)
244 {
245 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,EVP_R_NO_CIPHER_SET);
246 goto err;
247 }
248 keylen = EVP_CIPHER_CTX_key_length(ctx);
249 OPENSSL_assert(keylen <= sizeof key);
250
251 /* Decode parameter */
252
253 if(!param || (param->type != V_ASN1_SEQUENCE))
254 {
255 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,EVP_R_DECODE_ERROR);
256 goto err;
257 }
258
259 pbuf = param->value.sequence->data;
260 plen = param->value.sequence->length;
261
262 if(!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
263 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,EVP_R_DECODE_ERROR);
264 goto err;
265 }
266
267 keylen = EVP_CIPHER_CTX_key_length(ctx);
268
269 /* Now check the parameters of the kdf */
270
271 if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)){
272 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
273 EVP_R_UNSUPPORTED_KEYLENGTH);
274 goto err;
275 }
276
277 if (kdf->prf)
278 prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
279 else
280 prf_nid = NID_hmacWithSHA1;
281
282 if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0))
283 {
284 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
285 goto err;
286 }
287
288 prfmd = EVP_get_digestbynid(hmac_md_nid);
289 if (prfmd == NULL)
290 {
291 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
292 goto err;
293 }
294
295 if(kdf->salt->type != V_ASN1_OCTET_STRING) {
296 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
297 EVP_R_UNSUPPORTED_SALT_TYPE);
298 goto err;
299 }
300
301 /* it seems that its all OK */
302 salt = kdf->salt->value.octet_string->data;
303 saltlen = kdf->salt->value.octet_string->length;
304 iter = ASN1_INTEGER_get(kdf->iter);
305 if(!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
306 keylen, key))
307 goto err;
308 rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
309 err:
310 OPENSSL_cleanse(key, keylen);
311 PBKDF2PARAM_free(kdf);
312 return rv;
313}
314
315#ifdef DEBUG_PKCS5V2
316static void h__dump (const unsigned char *p, int len)
317{
318 for (; len --; p++) fprintf(stderr, "%02X ", *p);
319 fprintf(stderr, "\n");
320}
321#endif
322#endif
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