1 /* $OpenBSD: p5_crpt.c,v 1.20 2021/12/12 21:30:13 tb Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 1999.
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 <stdlib.h>
61 #include <string.h>
62
63 #include <openssl/err.h>
64 #include <openssl/evp.h>
65 #include <openssl/x509.h>
66
67 #include "evp_locl.h"
68
69 /* Doesn't do anything now: Builtin PBE algorithms in static table.
70 */
71
72 void
PKCS5_PBE_add(void)73 PKCS5_PBE_add(void)
74 {
75 }
76
77 int
PKCS5_PBE_keyivgen(EVP_CIPHER_CTX * cctx,const char * pass,int passlen,ASN1_TYPE * param,const EVP_CIPHER * cipher,const EVP_MD * md,int en_de)78 PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
79 ASN1_TYPE *param, const EVP_CIPHER *cipher, const EVP_MD *md, int en_de)
80 {
81 EVP_MD_CTX ctx;
82 unsigned char md_tmp[EVP_MAX_MD_SIZE];
83 unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
84 int i;
85 PBEPARAM *pbe;
86 int saltlen, iter;
87 unsigned char *salt;
88 const unsigned char *pbuf;
89 int mdsize;
90 int rv = 0;
91
92 /* Extract useful info from parameter */
93 if (param == NULL || param->type != V_ASN1_SEQUENCE ||
94 param->value.sequence == NULL) {
95 EVPerror(EVP_R_DECODE_ERROR);
96 return 0;
97 }
98
99 mdsize = EVP_MD_size(md);
100 if (mdsize < 0)
101 return 0;
102
103 pbuf = param->value.sequence->data;
104 if (!(pbe = d2i_PBEPARAM(NULL, &pbuf, param->value.sequence->length))) {
105 EVPerror(EVP_R_DECODE_ERROR);
106 return 0;
107 }
108
109 if (!pbe->iter)
110 iter = 1;
111 else if ((iter = ASN1_INTEGER_get(pbe->iter)) <= 0) {
112 EVPerror(EVP_R_UNSUPORTED_NUMBER_OF_ROUNDS);
113 PBEPARAM_free(pbe);
114 return 0;
115 }
116 salt = pbe->salt->data;
117 saltlen = pbe->salt->length;
118
119 if (!pass)
120 passlen = 0;
121 else if (passlen == -1)
122 passlen = strlen(pass);
123
124 EVP_MD_CTX_init(&ctx);
125
126 if (!EVP_DigestInit_ex(&ctx, md, NULL))
127 goto err;
128 if (!EVP_DigestUpdate(&ctx, pass, passlen))
129 goto err;
130 if (!EVP_DigestUpdate(&ctx, salt, saltlen))
131 goto err;
132 if (!EVP_DigestFinal_ex(&ctx, md_tmp, NULL))
133 goto err;
134 for (i = 1; i < iter; i++) {
135 if (!EVP_DigestInit_ex(&ctx, md, NULL))
136 goto err;
137 if (!EVP_DigestUpdate(&ctx, md_tmp, mdsize))
138 goto err;
139 if (!EVP_DigestFinal_ex (&ctx, md_tmp, NULL))
140 goto err;
141 }
142 if ((size_t)EVP_CIPHER_key_length(cipher) > sizeof(md_tmp)) {
143 EVPerror(EVP_R_BAD_KEY_LENGTH);
144 goto err;
145 }
146 memcpy(key, md_tmp, EVP_CIPHER_key_length(cipher));
147 if ((size_t)EVP_CIPHER_iv_length(cipher) > 16) {
148 EVPerror(EVP_R_IV_TOO_LARGE);
149 goto err;
150 }
151 memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)),
152 EVP_CIPHER_iv_length(cipher));
153 if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de))
154 goto err;
155 explicit_bzero(md_tmp, EVP_MAX_MD_SIZE);
156 explicit_bzero(key, EVP_MAX_KEY_LENGTH);
157 explicit_bzero(iv, EVP_MAX_IV_LENGTH);
158 rv = 1;
159 err:
160 EVP_MD_CTX_cleanup(&ctx);
161 PBEPARAM_free(pbe);
162 return rv;
163 }
164