2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
61 #include <openssl/asn1t.h>
62 #include <openssl/x509.h>
63 #include <openssl/rand.h>
65 /* PKCS#5 v2.0 password based encryption structures */
67 ASN1_SEQUENCE(PBE2PARAM) = {
68 ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR),
69 ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR)
70 } ASN1_SEQUENCE_END(PBE2PARAM)
72 IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM)
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)
81 IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM)
83 /* Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm:
84 * yes I know this is horrible!
87 X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
88 unsigned char *salt, int saltlen)
90 X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL;
93 unsigned char iv[EVP_MAX_IV_LENGTH];
94 PBKDF2PARAM *kdf = NULL;
95 PBE2PARAM *pbe2 = NULL;
96 ASN1_OCTET_STRING *osalt = NULL;
99 alg_nid = EVP_CIPHER_type(cipher);
100 if(alg_nid == NID_undef) {
101 ASN1err(ASN1_F_PKCS5_PBE2_SET,
102 ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
105 obj = OBJ_nid2obj(alg_nid);
107 if(!(pbe2 = PBE2PARAM_new())) goto merr;
109 /* Setup the AlgorithmIdentifier for the encryption scheme */
110 scheme = pbe2->encryption;
112 scheme->algorithm = obj;
113 if(!(scheme->parameter = ASN1_TYPE_new())) goto merr;
115 /* Create random IV */
116 if (RAND_pseudo_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0)
119 EVP_CIPHER_CTX_init(&ctx);
121 /* Dummy cipherinit to just setup the IV */
122 EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0);
123 if(EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) {
124 ASN1err(ASN1_F_PKCS5_PBE2_SET,
125 ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
128 EVP_CIPHER_CTX_cleanup(&ctx);
130 if(!(kdf = PBKDF2PARAM_new())) goto merr;
131 if(!(osalt = M_ASN1_OCTET_STRING_new())) goto merr;
133 if (!saltlen) saltlen = PKCS5_SALT_LEN;
134 if (!(osalt->data = OPENSSL_malloc (saltlen))) goto merr;
135 osalt->length = saltlen;
136 if (salt) memcpy (osalt->data, salt, saltlen);
137 else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0) goto merr;
139 if(iter <= 0) iter = PKCS5_DEFAULT_ITER;
140 if(!ASN1_INTEGER_set(kdf->iter, iter)) goto merr;
142 /* Now include salt in kdf structure */
143 kdf->salt->value.octet_string = osalt;
144 kdf->salt->type = V_ASN1_OCTET_STRING;
147 /* If its RC2 then we'd better setup the key length */
149 if(alg_nid == NID_rc2_cbc) {
150 if(!(kdf->keylength = M_ASN1_INTEGER_new())) goto merr;
151 if(!ASN1_INTEGER_set (kdf->keylength,
152 EVP_CIPHER_key_length(cipher))) goto merr;
155 /* prf can stay NULL because we are using hmacWithSHA1 */
157 /* Now setup the PBE2PARAM keyfunc structure */
159 pbe2->keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
161 /* Encode PBKDF2PARAM into parameter of pbe2 */
163 if(!(pbe2->keyfunc->parameter = ASN1_TYPE_new())) goto merr;
165 if(!ASN1_pack_string(kdf, i2d_PBKDF2PARAM,
166 &pbe2->keyfunc->parameter->value.sequence)) goto merr;
167 pbe2->keyfunc->parameter->type = V_ASN1_SEQUENCE;
169 PBKDF2PARAM_free(kdf);
172 /* Now set up top level AlgorithmIdentifier */
174 if(!(ret = X509_ALGOR_new())) goto merr;
175 if(!(ret->parameter = ASN1_TYPE_new())) goto merr;
177 ret->algorithm = OBJ_nid2obj(NID_pbes2);
179 /* Encode PBE2PARAM into parameter */
181 if(!ASN1_pack_string(pbe2, i2d_PBE2PARAM,
182 &ret->parameter->value.sequence)) goto merr;
183 ret->parameter->type = V_ASN1_SEQUENCE;
185 PBE2PARAM_free(pbe2);
191 ASN1err(ASN1_F_PKCS5_PBE2_SET,ERR_R_MALLOC_FAILURE);
194 PBE2PARAM_free(pbe2);
195 /* Note 'scheme' is freed as part of pbe2 */
196 M_ASN1_OCTET_STRING_free(osalt);
197 PBKDF2PARAM_free(kdf);
198 X509_ALGOR_free(kalg);
199 X509_ALGOR_free(ret);