1 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
2 * project 2007.
3 */
4 /* ====================================================================
5 * Copyright (c) 2007 The OpenSSL Project. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
23 *
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * licensing@OpenSSL.org.
28 *
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
32 *
33 * 6. Redistributions of any form whatsoever must retain the following
34 * acknowledgment:
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
51 *
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
55 *
56 */
57
58 #include <stdio.h>
59 #include "cryptlib.h"
60 #include <openssl/evp.h>
61 #include "asn1_locl.h"
62
63 #define HMAC_TEST_PRIVATE_KEY_FORMAT
64
65 /* HMAC "ASN1" method. This is just here to indicate the
66 * maximum HMAC output length and to free up an HMAC
67 * key.
68 */
69
70 static int hmac_size(const EVP_PKEY *pkey)
71 {
72 return EVP_MAX_MD_SIZE;
73 }
74
75 static void hmac_key_free(EVP_PKEY *pkey)
76 {
77 ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
78 if (os)
79 {
80 if (os->data)
81 OPENSSL_cleanse(os->data, os->length);
82 ASN1_OCTET_STRING_free(os);
83 }
84 }
85
86
87 static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
88 {
89 switch (op)
90 {
91 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
92 *(int *)arg2 = NID_sha1;
93 return 1;
94
95 default:
96 return -2;
97 }
98 }
99
100 #ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
101 /* A bogus private key format for test purposes. This is simply the
102 * HMAC key with "HMAC PRIVATE KEY" in the headers. When enabled the
103 * genpkey utility can be used to "generate" HMAC keys.
104 */
105
106 static int old_hmac_decode(EVP_PKEY *pkey,
107 const unsigned char **pder, int derlen)
108 {
109 ASN1_OCTET_STRING *os;
110 os = ASN1_OCTET_STRING_new();
111 if (!os || !ASN1_OCTET_STRING_set(os, *pder, derlen))
112 return 0;
113 EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, os);
114 return 1;
115 }
116
117 static int old_hmac_encode(const EVP_PKEY *pkey, unsigned char **pder)
118 {
119 int inc;
120 ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
121 if (pder)
122 {
123 if (!*pder)
124 {
125 *pder = OPENSSL_malloc(os->length);
126 inc = 0;
127 }
128 else inc = 1;
129
130 memcpy(*pder, os->data, os->length);
131
132 if (inc)
133 *pder += os->length;
134 }
135
136 return os->length;
137 }
138
139 #endif
140
141 const EVP_PKEY_ASN1_METHOD hmac_asn1_meth =
142 {
143 EVP_PKEY_HMAC,
144 EVP_PKEY_HMAC,
145 0,
146
147 "HMAC",
148 "OpenSSL HMAC method",
149
150 0,0,0,0,
151
152 0,0,0,
153
154 hmac_size,
155 0,
156 0,0,0,0,0,0,0,
157
158 hmac_key_free,
159 hmac_pkey_ctrl,
160 #ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
161 old_hmac_decode,
162 old_hmac_encode
163 #else
164 0,0
165 #endif
166 };