1 /* $OpenBSD: p12_mutl.c,v 1.38 2024/03/24 06:48:03 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/opensslconf.h>
64
65 #ifndef OPENSSL_NO_HMAC
66
67 #include <openssl/err.h>
68 #include <openssl/hmac.h>
69 #include <openssl/pkcs12.h>
70
71 #include "evp_local.h"
72 #include "hmac_local.h"
73 #include "pkcs12_local.h"
74 #include "x509_local.h"
75
76 int
PKCS12_mac_present(const PKCS12 * p12)77 PKCS12_mac_present(const PKCS12 *p12)
78 {
79 return p12->mac != NULL;
80 }
81 LCRYPTO_ALIAS(PKCS12_mac_present);
82
83 void
PKCS12_get0_mac(const ASN1_OCTET_STRING ** pmac,const X509_ALGOR ** pmacalg,const ASN1_OCTET_STRING ** psalt,const ASN1_INTEGER ** piter,const PKCS12 * p12)84 PKCS12_get0_mac(const ASN1_OCTET_STRING **pmac, const X509_ALGOR **pmacalg,
85 const ASN1_OCTET_STRING **psalt, const ASN1_INTEGER **piter,
86 const PKCS12 *p12)
87 {
88 if (p12->mac == NULL) {
89 if (pmac != NULL)
90 *pmac = NULL;
91 if (pmacalg != NULL)
92 *pmacalg = NULL;
93 if (psalt != NULL)
94 *psalt = NULL;
95 if (piter != NULL)
96 *piter = NULL;
97 return;
98 }
99
100 if (pmac != NULL)
101 *pmac = p12->mac->dinfo->digest;
102 if (pmacalg != NULL)
103 *pmacalg = p12->mac->dinfo->algor;
104 if (psalt != NULL)
105 *psalt = p12->mac->salt;
106 if (piter != NULL)
107 *piter = p12->mac->iter;
108 }
109 LCRYPTO_ALIAS(PKCS12_get0_mac);
110
111 /* Generate a MAC */
112 int
PKCS12_gen_mac(PKCS12 * p12,const char * pass,int passlen,unsigned char * mac,unsigned int * maclen)113 PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
114 unsigned char *mac, unsigned int *maclen)
115 {
116 const EVP_MD *md_type;
117 HMAC_CTX *hmac = NULL;
118 ASN1_OCTET_STRING *aos;
119 unsigned char key[EVP_MAX_MD_SIZE], *salt;
120 int saltlen, iter;
121 int md_size;
122 int ret = 0;
123
124 if (!PKCS7_type_is_data(p12->authsafes)) {
125 PKCS12error(PKCS12_R_CONTENT_TYPE_NOT_DATA);
126 goto err;
127 }
128 if ((aos = PKCS7_get_octet_string(p12->authsafes)) == NULL) {
129 PKCS12error(PKCS12_R_DECODE_ERROR);
130 goto err;
131 }
132
133 salt = p12->mac->salt->data;
134 saltlen = p12->mac->salt->length;
135
136 iter = 1;
137 if (p12->mac->iter != NULL) {
138 if ((iter = ASN1_INTEGER_get(p12->mac->iter)) <= 0) {
139 PKCS12error(PKCS12_R_DECODE_ERROR);
140 goto err;
141 }
142 }
143
144 md_type = EVP_get_digestbyobj(p12->mac->dinfo->algor->algorithm);
145 if (md_type == NULL) {
146 PKCS12error(PKCS12_R_UNKNOWN_DIGEST_ALGORITHM);
147 goto err;
148 }
149
150 if ((md_size = EVP_MD_size(md_type)) < 0)
151 goto err;
152
153 if (!PKCS12_key_gen(pass, passlen, salt, saltlen, PKCS12_MAC_ID, iter,
154 md_size, key, md_type)) {
155 PKCS12error(PKCS12_R_KEY_GEN_ERROR);
156 goto err;
157 }
158
159 if ((hmac = HMAC_CTX_new()) == NULL)
160 goto err;
161 if (!HMAC_Init_ex(hmac, key, md_size, md_type, NULL))
162 goto err;
163 if (!HMAC_Update(hmac, aos->data, aos->length))
164 goto err;
165 if (!HMAC_Final(hmac, mac, maclen))
166 goto err;
167
168 ret = 1;
169
170 err:
171 explicit_bzero(key, sizeof(key));
172 HMAC_CTX_free(hmac);
173
174 return ret;
175 }
176
177 /* Verify the mac */
178 int
PKCS12_verify_mac(PKCS12 * p12,const char * pass,int passlen)179 PKCS12_verify_mac(PKCS12 *p12, const char *pass, int passlen)
180 {
181 unsigned char mac[EVP_MAX_MD_SIZE];
182 unsigned int maclen;
183
184 if (p12->mac == NULL) {
185 PKCS12error(PKCS12_R_MAC_ABSENT);
186 return 0;
187 }
188 if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) {
189 PKCS12error(PKCS12_R_MAC_GENERATION_ERROR);
190 return 0;
191 }
192 if ((maclen != (unsigned int)p12->mac->dinfo->digest->length) ||
193 memcmp(mac, p12->mac->dinfo->digest->data, maclen))
194 return 0;
195 return 1;
196 }
197 LCRYPTO_ALIAS(PKCS12_verify_mac);
198
199 /* Set a mac */
200
201 int
PKCS12_set_mac(PKCS12 * p12,const char * pass,int passlen,unsigned char * salt,int saltlen,int iter,const EVP_MD * md_type)202 PKCS12_set_mac(PKCS12 *p12, const char *pass, int passlen, unsigned char *salt,
203 int saltlen, int iter, const EVP_MD *md_type)
204 {
205 unsigned char mac[EVP_MAX_MD_SIZE];
206 unsigned int maclen;
207
208 if (!md_type)
209 md_type = EVP_sha1();
210 if (PKCS12_setup_mac(p12, iter, salt, saltlen, md_type) ==
211 PKCS12_ERROR) {
212 PKCS12error(PKCS12_R_MAC_SETUP_ERROR);
213 return 0;
214 }
215 if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) {
216 PKCS12error(PKCS12_R_MAC_GENERATION_ERROR);
217 return 0;
218 }
219 if (!(ASN1_STRING_set(p12->mac->dinfo->digest, mac, maclen))) {
220 PKCS12error(PKCS12_R_MAC_STRING_SET_ERROR);
221 return 0;
222 }
223 return 1;
224 }
225 LCRYPTO_ALIAS(PKCS12_set_mac);
226
227 /* Set up a mac structure */
228 int
PKCS12_setup_mac(PKCS12 * p12,int iter,unsigned char * salt,int saltlen,const EVP_MD * md_type)229 PKCS12_setup_mac(PKCS12 *p12, int iter, unsigned char *salt, int saltlen,
230 const EVP_MD *md_type)
231 {
232 PKCS12_MAC_DATA_free(p12->mac);
233 if ((p12->mac = PKCS12_MAC_DATA_new()) == NULL)
234 return PKCS12_ERROR;
235 if (iter > 1) {
236 if (!(p12->mac->iter = ASN1_INTEGER_new())) {
237 PKCS12error(ERR_R_MALLOC_FAILURE);
238 return 0;
239 }
240 if (!ASN1_INTEGER_set(p12->mac->iter, iter)) {
241 PKCS12error(ERR_R_MALLOC_FAILURE);
242 return 0;
243 }
244 }
245 if (!saltlen)
246 saltlen = PKCS12_SALT_LEN;
247 if (!(p12->mac->salt->data = malloc(saltlen))) {
248 PKCS12error(ERR_R_MALLOC_FAILURE);
249 return 0;
250 }
251 p12->mac->salt->length = saltlen;
252 if (!salt)
253 arc4random_buf(p12->mac->salt->data, saltlen);
254 else
255 memcpy(p12->mac->salt->data, salt, saltlen);
256 p12->mac->dinfo->algor->algorithm = OBJ_nid2obj(EVP_MD_type(md_type));
257 if (!(p12->mac->dinfo->algor->parameter = ASN1_TYPE_new())) {
258 PKCS12error(ERR_R_MALLOC_FAILURE);
259 return 0;
260 }
261 p12->mac->dinfo->algor->parameter->type = V_ASN1_NULL;
262
263 return 1;
264 }
265 #endif
266