p12_mutl.c revision 306195 
1/* p12_mutl.c */
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 1999.
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#ifndef OPENSSL_NO_HMAC
61# include <stdio.h>
62# include "cryptlib.h"
63# include <openssl/crypto.h>
64# include <openssl/hmac.h>
65# include <openssl/rand.h>
66# include <openssl/pkcs12.h>
67
68/* Generate a MAC */
69int PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
70                   unsigned char *mac, unsigned int *maclen)
71{
72    const EVP_MD *md_type;
73    HMAC_CTX hmac;
74    unsigned char key[EVP_MAX_MD_SIZE], *salt;
75    int saltlen, iter;
76    int md_size;
77
78    if (!PKCS7_type_is_data(p12->authsafes)) {
79        PKCS12err(PKCS12_F_PKCS12_GEN_MAC, PKCS12_R_CONTENT_TYPE_NOT_DATA);
80        return 0;
81    }
82
83    salt = p12->mac->salt->data;
84    saltlen = p12->mac->salt->length;
85    if (!p12->mac->iter)
86        iter = 1;
87    else
88        iter = ASN1_INTEGER_get(p12->mac->iter);
89    if (!(md_type = EVP_get_digestbyobj(p12->mac->dinfo->algor->algorithm))) {
90        PKCS12err(PKCS12_F_PKCS12_GEN_MAC, PKCS12_R_UNKNOWN_DIGEST_ALGORITHM);
91        return 0;
92    }
93    md_size = EVP_MD_size(md_type);
94    if (md_size < 0)
95        return 0;
96    if (!PKCS12_key_gen(pass, passlen, salt, saltlen, PKCS12_MAC_ID, iter,
97                        md_size, key, md_type)) {
98        PKCS12err(PKCS12_F_PKCS12_GEN_MAC, PKCS12_R_KEY_GEN_ERROR);
99        return 0;
100    }
101    HMAC_CTX_init(&hmac);
102    if (!HMAC_Init_ex(&hmac, key, md_size, md_type, NULL)
103        || !HMAC_Update(&hmac, p12->authsafes->d.data->data,
104                        p12->authsafes->d.data->length)
105        || !HMAC_Final(&hmac, mac, maclen)) {
106        HMAC_CTX_cleanup(&hmac);
107        return 0;
108    }
109    HMAC_CTX_cleanup(&hmac);
110    return 1;
111}
112
113/* Verify the mac */
114int PKCS12_verify_mac(PKCS12 *p12, const char *pass, int passlen)
115{
116    unsigned char mac[EVP_MAX_MD_SIZE];
117    unsigned int maclen;
118    if (p12->mac == NULL) {
119        PKCS12err(PKCS12_F_PKCS12_VERIFY_MAC, PKCS12_R_MAC_ABSENT);
120        return 0;
121    }
122    if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) {
123        PKCS12err(PKCS12_F_PKCS12_VERIFY_MAC, PKCS12_R_MAC_GENERATION_ERROR);
124        return 0;
125    }
126    if ((maclen != (unsigned int)p12->mac->dinfo->digest->length)
127        || CRYPTO_memcmp(mac, p12->mac->dinfo->digest->data, maclen))
128        return 0;
129    return 1;
130}
131
132/* Set a mac */
133
134int PKCS12_set_mac(PKCS12 *p12, const char *pass, int passlen,
135                   unsigned char *salt, int saltlen, int iter,
136                   const EVP_MD *md_type)
137{
138    unsigned char mac[EVP_MAX_MD_SIZE];
139    unsigned int maclen;
140
141    if (!md_type)
142        md_type = EVP_sha1();
143    if (PKCS12_setup_mac(p12, iter, salt, saltlen, md_type) == PKCS12_ERROR) {
144        PKCS12err(PKCS12_F_PKCS12_SET_MAC, PKCS12_R_MAC_SETUP_ERROR);
145        return 0;
146    }
147    if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) {
148        PKCS12err(PKCS12_F_PKCS12_SET_MAC, PKCS12_R_MAC_GENERATION_ERROR);
149        return 0;
150    }
151    if (!(M_ASN1_OCTET_STRING_set(p12->mac->dinfo->digest, mac, maclen))) {
152        PKCS12err(PKCS12_F_PKCS12_SET_MAC, PKCS12_R_MAC_STRING_SET_ERROR);
153        return 0;
154    }
155    return 1;
156}
157
158/* Set up a mac structure */
159int PKCS12_setup_mac(PKCS12 *p12, int iter, unsigned char *salt, int saltlen,
160                     const EVP_MD *md_type)
161{
162    if (!(p12->mac = PKCS12_MAC_DATA_new()))
163        return PKCS12_ERROR;
164    if (iter > 1) {
165        if (!(p12->mac->iter = M_ASN1_INTEGER_new())) {
166            PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);
167            return 0;
168        }
169        if (!ASN1_INTEGER_set(p12->mac->iter, iter)) {
170            PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);
171            return 0;
172        }
173    }
174    if (!saltlen)
175        saltlen = PKCS12_SALT_LEN;
176    if ((p12->mac->salt->data = OPENSSL_malloc(saltlen)) == NULL) {
177        PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);
178        return 0;
179    }
180    p12->mac->salt->length = saltlen;
181    if (!salt) {
182        if (RAND_bytes(p12->mac->salt->data, saltlen) <= 0)
183            return 0;
184    } else
185        memcpy(p12->mac->salt->data, salt, saltlen);
186    p12->mac->dinfo->algor->algorithm = OBJ_nid2obj(EVP_MD_type(md_type));
187    if (!(p12->mac->dinfo->algor->parameter = ASN1_TYPE_new())) {
188        PKCS12err(PKCS12_F_PKCS12_SETUP_MAC, ERR_R_MALLOC_FAILURE);
189        return 0;
190    }
191    p12->mac->dinfo->algor->parameter->type = V_ASN1_NULL;
192
193    return 1;
194}
195#endif
196