Line data Source code
1 : /* p5_pbev2.c */
2 : /*
3 : * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 : * 1999-2004.
5 : */
6 : /* ====================================================================
7 : * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
8 : *
9 : * Redistribution and use in source and binary forms, with or without
10 : * modification, are permitted provided that the following conditions
11 : * are met:
12 : *
13 : * 1. Redistributions of source code must retain the above copyright
14 : * notice, this list of conditions and the following disclaimer.
15 : *
16 : * 2. Redistributions in binary form must reproduce the above copyright
17 : * notice, this list of conditions and the following disclaimer in
18 : * the documentation and/or other materials provided with the
19 : * distribution.
20 : *
21 : * 3. All advertising materials mentioning features or use of this
22 : * software must display the following acknowledgment:
23 : * "This product includes software developed by the OpenSSL Project
24 : * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 : *
26 : * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 : * endorse or promote products derived from this software without
28 : * prior written permission. For written permission, please contact
29 : * licensing@OpenSSL.org.
30 : *
31 : * 5. Products derived from this software may not be called "OpenSSL"
32 : * nor may "OpenSSL" appear in their names without prior written
33 : * permission of the OpenSSL Project.
34 : *
35 : * 6. Redistributions of any form whatsoever must retain the following
36 : * acknowledgment:
37 : * "This product includes software developed by the OpenSSL Project
38 : * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 : *
40 : * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 : * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 : * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 : * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 : * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 : * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 : * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 : * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 : * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 : * OF THE POSSIBILITY OF SUCH DAMAGE.
52 : * ====================================================================
53 : *
54 : * This product includes cryptographic software written by Eric Young
55 : * (eay@cryptsoft.com). This product includes software written by Tim
56 : * Hudson (tjh@cryptsoft.com).
57 : *
58 : */
59 :
60 : #include <stdio.h>
61 : #include "cryptlib.h"
62 : #include <openssl/asn1t.h>
63 : #include <openssl/x509.h>
64 : #include <openssl/rand.h>
65 :
66 : /* PKCS#5 v2.0 password based encryption structures */
67 :
68 : ASN1_SEQUENCE(PBE2PARAM) = {
69 : ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR),
70 : ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR)
71 : } ASN1_SEQUENCE_END(PBE2PARAM)
72 :
73 0 : IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM)
74 :
75 : ASN1_SEQUENCE(PBKDF2PARAM) = {
76 : ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY),
77 : ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER),
78 : ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER),
79 : ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR)
80 : } ASN1_SEQUENCE_END(PBKDF2PARAM)
81 :
82 0 : IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM)
83 :
84 : /*
85 : * Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm: yes I know
86 : * this is horrible! Extended version to allow application supplied PRF NID
87 : * and IV.
88 : */
89 :
90 0 : X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
91 : unsigned char *salt, int saltlen,
92 : unsigned char *aiv, int prf_nid)
93 : {
94 : X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL;
95 : int alg_nid, keylen;
96 : EVP_CIPHER_CTX ctx;
97 : unsigned char iv[EVP_MAX_IV_LENGTH];
98 : PBE2PARAM *pbe2 = NULL;
99 : ASN1_OBJECT *obj;
100 :
101 0 : alg_nid = EVP_CIPHER_type(cipher);
102 0 : if (alg_nid == NID_undef) {
103 0 : ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
104 : ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
105 0 : goto err;
106 : }
107 0 : obj = OBJ_nid2obj(alg_nid);
108 :
109 0 : if (!(pbe2 = PBE2PARAM_new()))
110 : goto merr;
111 :
112 : /* Setup the AlgorithmIdentifier for the encryption scheme */
113 0 : scheme = pbe2->encryption;
114 :
115 0 : scheme->algorithm = obj;
116 0 : if (!(scheme->parameter = ASN1_TYPE_new()))
117 : goto merr;
118 :
119 : /* Create random IV */
120 0 : if (EVP_CIPHER_iv_length(cipher)) {
121 0 : if (aiv)
122 0 : memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher));
123 0 : else if (RAND_pseudo_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0)
124 : goto err;
125 : }
126 :
127 0 : EVP_CIPHER_CTX_init(&ctx);
128 :
129 : /* Dummy cipherinit to just setup the IV, and PRF */
130 0 : if (!EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0))
131 : goto err;
132 0 : if (EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) {
133 0 : ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
134 0 : EVP_CIPHER_CTX_cleanup(&ctx);
135 0 : goto err;
136 : }
137 : /*
138 : * If prf NID unspecified see if cipher has a preference. An error is OK
139 : * here: just means use default PRF.
140 : */
141 0 : if ((prf_nid == -1) &&
142 0 : EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0) {
143 0 : ERR_clear_error();
144 0 : prf_nid = NID_hmacWithSHA1;
145 : }
146 0 : EVP_CIPHER_CTX_cleanup(&ctx);
147 :
148 : /* If its RC2 then we'd better setup the key length */
149 :
150 0 : if (alg_nid == NID_rc2_cbc)
151 0 : keylen = EVP_CIPHER_key_length(cipher);
152 : else
153 : keylen = -1;
154 :
155 : /* Setup keyfunc */
156 :
157 0 : X509_ALGOR_free(pbe2->keyfunc);
158 :
159 0 : pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen);
160 :
161 0 : if (!pbe2->keyfunc)
162 : goto merr;
163 :
164 : /* Now set up top level AlgorithmIdentifier */
165 :
166 0 : if (!(ret = X509_ALGOR_new()))
167 : goto merr;
168 0 : if (!(ret->parameter = ASN1_TYPE_new()))
169 : goto merr;
170 :
171 0 : ret->algorithm = OBJ_nid2obj(NID_pbes2);
172 :
173 : /* Encode PBE2PARAM into parameter */
174 :
175 0 : if (!ASN1_item_pack(pbe2, ASN1_ITEM_rptr(PBE2PARAM),
176 0 : &ret->parameter->value.sequence))
177 : goto merr;
178 0 : ret->parameter->type = V_ASN1_SEQUENCE;
179 :
180 : PBE2PARAM_free(pbe2);
181 : pbe2 = NULL;
182 :
183 0 : return ret;
184 :
185 : merr:
186 0 : ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ERR_R_MALLOC_FAILURE);
187 :
188 : err:
189 : PBE2PARAM_free(pbe2);
190 : /* Note 'scheme' is freed as part of pbe2 */
191 0 : X509_ALGOR_free(kalg);
192 0 : X509_ALGOR_free(ret);
193 :
194 0 : return NULL;
195 :
196 : }
197 :
198 0 : X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
199 : unsigned char *salt, int saltlen)
200 : {
201 0 : return PKCS5_pbe2_set_iv(cipher, iter, salt, saltlen, NULL, -1);
202 : }
203 :
204 0 : X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen,
205 : int prf_nid, int keylen)
206 : {
207 : X509_ALGOR *keyfunc = NULL;
208 : PBKDF2PARAM *kdf = NULL;
209 : ASN1_OCTET_STRING *osalt = NULL;
210 :
211 0 : if (!(kdf = PBKDF2PARAM_new()))
212 : goto merr;
213 0 : if (!(osalt = M_ASN1_OCTET_STRING_new()))
214 : goto merr;
215 :
216 0 : kdf->salt->value.octet_string = osalt;
217 0 : kdf->salt->type = V_ASN1_OCTET_STRING;
218 :
219 0 : if (!saltlen)
220 : saltlen = PKCS5_SALT_LEN;
221 0 : if (!(osalt->data = OPENSSL_malloc(saltlen)))
222 : goto merr;
223 :
224 0 : osalt->length = saltlen;
225 :
226 0 : if (salt)
227 0 : memcpy(osalt->data, salt, saltlen);
228 0 : else if (RAND_pseudo_bytes(osalt->data, saltlen) < 0)
229 : goto merr;
230 :
231 0 : if (iter <= 0)
232 : iter = PKCS5_DEFAULT_ITER;
233 :
234 0 : if (!ASN1_INTEGER_set(kdf->iter, iter))
235 : goto merr;
236 :
237 : /* If have a key len set it up */
238 :
239 0 : if (keylen > 0) {
240 0 : if (!(kdf->keylength = M_ASN1_INTEGER_new()))
241 : goto merr;
242 0 : if (!ASN1_INTEGER_set(kdf->keylength, keylen))
243 : goto merr;
244 : }
245 :
246 : /* prf can stay NULL if we are using hmacWithSHA1 */
247 0 : if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1) {
248 0 : kdf->prf = X509_ALGOR_new();
249 0 : if (!kdf->prf)
250 : goto merr;
251 0 : X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), V_ASN1_NULL, NULL);
252 : }
253 :
254 : /* Finally setup the keyfunc structure */
255 :
256 0 : keyfunc = X509_ALGOR_new();
257 0 : if (!keyfunc)
258 : goto merr;
259 :
260 0 : keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
261 :
262 : /* Encode PBKDF2PARAM into parameter of pbe2 */
263 :
264 0 : if (!(keyfunc->parameter = ASN1_TYPE_new()))
265 : goto merr;
266 :
267 0 : if (!ASN1_item_pack(kdf, ASN1_ITEM_rptr(PBKDF2PARAM),
268 0 : &keyfunc->parameter->value.sequence))
269 : goto merr;
270 0 : keyfunc->parameter->type = V_ASN1_SEQUENCE;
271 :
272 : PBKDF2PARAM_free(kdf);
273 0 : return keyfunc;
274 :
275 : merr:
276 0 : ASN1err(ASN1_F_PKCS5_PBKDF2_SET, ERR_R_MALLOC_FAILURE);
277 : PBKDF2PARAM_free(kdf);
278 0 : X509_ALGOR_free(keyfunc);
279 0 : return NULL;
280 : }
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