1 /* p5_pbev2.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 1999-2004.
4 */
5 /* ====================================================================
6 * Copyright (c) 1999 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 "cryptlib.h"
61 #include <openssl/asn1t.h>
62 #include <openssl/x509.h>
63 #include <openssl/rand.h>
64
65 /* PKCS#5 v2.0 password based encryption structures */
66
67 ASN1_SEQUENCE(PBE2PARAM) = {
68 ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR),
69 ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR)
70 } ASN1_SEQUENCE_END(PBE2PARAM)
71
72 IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM)
73
74 ASN1_SEQUENCE(PBKDF2PARAM) = {
75 ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY),
76 ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER),
77 ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER),
78 ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR)
79 } ASN1_SEQUENCE_END(PBKDF2PARAM)
80
81 IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM)
82
83 /* Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm:
84 * yes I know this is horrible!
85 *
86 * Extended version to allow application supplied PRF NID and IV.
87 */
88
89 X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
90 unsigned char *salt, int saltlen,
91 unsigned char *aiv, int prf_nid)
92 {
93 X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL;
94 int alg_nid, keylen;
95 EVP_CIPHER_CTX ctx;
96 unsigned char iv[EVP_MAX_IV_LENGTH];
97 PBE2PARAM *pbe2 = NULL;
98 ASN1_OBJECT *obj;
99
100 alg_nid = EVP_CIPHER_type(cipher);
101 if(alg_nid == NID_undef) {
102 ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
103 ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
104 goto err;
105 }
106 obj = OBJ_nid2obj(alg_nid);
107
108 if(!(pbe2 = PBE2PARAM_new())) goto merr;
109
110 /* Setup the AlgorithmIdentifier for the encryption scheme */
111 scheme = pbe2->encryption;
112
113 scheme->algorithm = obj;
114 if(!(scheme->parameter = ASN1_TYPE_new())) goto merr;
115
116 /* Create random IV */
117 if (EVP_CIPHER_iv_length(cipher))
118 {
119 if (aiv)
120 memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher));
121 else if (RAND_pseudo_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0)
122 goto err;
123 }
124
125 EVP_CIPHER_CTX_init(&ctx);
126
127 /* Dummy cipherinit to just setup the IV, and PRF */
128 if (!EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0))
129 goto err;
130 if(EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) {
131 ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
132 ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
133 EVP_CIPHER_CTX_cleanup(&ctx);
134 goto err;
135 }
136 /* If prf NID unspecified see if cipher has a preference.
137 * An error is OK here: just means use default PRF.
138 */
139 if ((prf_nid == -1) &&
140 EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0)
141 {
142 ERR_clear_error();
143 prf_nid = NID_hmacWithSHA1;
144 }
145 EVP_CIPHER_CTX_cleanup(&ctx);
146
147 /* If its RC2 then we'd better setup the key length */
148
149 if(alg_nid == NID_rc2_cbc)
150 keylen = EVP_CIPHER_key_length(cipher);
151 else
152 keylen = -1;
153
154 /* Setup keyfunc */
155
156 X509_ALGOR_free(pbe2->keyfunc);
157
158 pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen);
159
160 if (!pbe2->keyfunc)
161 goto merr;
162
163 /* Now set up top level AlgorithmIdentifier */
164
165 if(!(ret = X509_ALGOR_new())) goto merr;
166 if(!(ret->parameter = ASN1_TYPE_new())) goto merr;
167
168 ret->algorithm = OBJ_nid2obj(NID_pbes2);
169
170 /* Encode PBE2PARAM into parameter */
171
172 if(!ASN1_item_pack(pbe2, ASN1_ITEM_rptr(PBE2PARAM),
173 &ret->parameter->value.sequence)) goto merr;
174 ret->parameter->type = V_ASN1_SEQUENCE;
175
176 PBE2PARAM_free(pbe2);
177 pbe2 = NULL;
178
179 return ret;
180
181 merr:
182 ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,ERR_R_MALLOC_FAILURE);
183
184 err:
185 PBE2PARAM_free(pbe2);
186 /* Note 'scheme' is freed as part of pbe2 */
187 X509_ALGOR_free(kalg);
188 X509_ALGOR_free(ret);
189
190 return NULL;
191
192 }
193
194 X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
195 unsigned char *salt, int saltlen)
196 {
197 return PKCS5_pbe2_set_iv(cipher, iter, salt, saltlen, NULL, -1);
198 }
199
200 X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen,
201 int prf_nid, int keylen)
202 {
203 X509_ALGOR *keyfunc = NULL;
204 PBKDF2PARAM *kdf = NULL;
205 ASN1_OCTET_STRING *osalt = NULL;
206
207 if(!(kdf = PBKDF2PARAM_new()))
208 goto merr;
209 if(!(osalt = M_ASN1_OCTET_STRING_new()))
210 goto merr;
211
212 kdf->salt->value.octet_string = osalt;
213 kdf->salt->type = V_ASN1_OCTET_STRING;
214
215 if (!saltlen)
216 saltlen = PKCS5_SALT_LEN;
217 if (!(osalt->data = OPENSSL_malloc (saltlen)))
218 goto merr;
219
220 osalt->length = saltlen;
221
222 if (salt)
223 memcpy (osalt->data, salt, saltlen);
224 else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0)
225 goto merr;
226
227 if(iter <= 0)
228 iter = PKCS5_DEFAULT_ITER;
229
230 if(!ASN1_INTEGER_set(kdf->iter, iter))
231 goto merr;
232
233 /* If have a key len set it up */
234
235 if(keylen > 0)
236 {
237 if(!(kdf->keylength = M_ASN1_INTEGER_new()))
238 goto merr;
239 if(!ASN1_INTEGER_set (kdf->keylength, keylen))
240 goto merr;
241 }
242
243 /* prf can stay NULL if we are using hmacWithSHA1 */
244 if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1)
245 {
246 kdf->prf = X509_ALGOR_new();
247 if (!kdf->prf)
248 goto merr;
249 X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid),
250 V_ASN1_NULL, NULL);
251 }
252
253 /* Finally setup the keyfunc structure */
254
255 keyfunc = X509_ALGOR_new();
256 if (!keyfunc)
257 goto merr;
258
259 keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
260
261 /* Encode PBKDF2PARAM into parameter of pbe2 */
262
263 if(!(keyfunc->parameter = ASN1_TYPE_new()))
264 goto merr;
265
266 if(!ASN1_item_pack(kdf, ASN1_ITEM_rptr(PBKDF2PARAM),
267 &keyfunc->parameter->value.sequence))
268 goto merr;
269 keyfunc->parameter->type = V_ASN1_SEQUENCE;
270
271 PBKDF2PARAM_free(kdf);
272 return keyfunc;
273
274 merr:
275 ASN1err(ASN1_F_PKCS5_PBKDF2_SET,ERR_R_MALLOC_FAILURE);
276 PBKDF2PARAM_free(kdf);
277 X509_ALGOR_free(keyfunc);
278 return NULL;
279 }