Line data Source code
1 : /*
2 : * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
3 : * 2007.
4 : */
5 : /* ====================================================================
6 : * Copyright (c) 2007 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 "cryptlib.h"
61 : #include <openssl/evp.h>
62 : #include "asn1_locl.h"
63 :
64 : #define HMAC_TEST_PRIVATE_KEY_FORMAT
65 :
66 : /*
67 : * HMAC "ASN1" method. This is just here to indicate the maximum HMAC output
68 : * length and to free up an HMAC key.
69 : */
70 :
71 0 : static int hmac_size(const EVP_PKEY *pkey)
72 : {
73 0 : return EVP_MAX_MD_SIZE;
74 : }
75 :
76 3675 : static void hmac_key_free(EVP_PKEY *pkey)
77 : {
78 3675 : ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
79 3675 : if (os) {
80 3675 : if (os->data)
81 3675 : OPENSSL_cleanse(os->data, os->length);
82 3675 : ASN1_OCTET_STRING_free(os);
83 : }
84 3675 : }
85 :
86 0 : static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
87 : {
88 0 : switch (op) {
89 : case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
90 0 : *(int *)arg2 = NID_sha256;
91 0 : return 1;
92 :
93 : default:
94 : return -2;
95 : }
96 : }
97 :
98 : #ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
99 : /*
100 : * A bogus private key format for test purposes. This is simply the HMAC key
101 : * with "HMAC PRIVATE KEY" in the headers. When enabled the genpkey utility
102 : * can be used to "generate" HMAC keys.
103 : */
104 :
105 0 : static int old_hmac_decode(EVP_PKEY *pkey,
106 : const unsigned char **pder, int derlen)
107 : {
108 : ASN1_OCTET_STRING *os;
109 0 : os = ASN1_OCTET_STRING_new();
110 0 : if (!os || !ASN1_OCTET_STRING_set(os, *pder, derlen))
111 : return 0;
112 0 : EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, os);
113 0 : return 1;
114 : }
115 :
116 0 : static int old_hmac_encode(const EVP_PKEY *pkey, unsigned char **pder)
117 : {
118 : int inc;
119 0 : ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
120 0 : if (pder) {
121 0 : if (!*pder) {
122 0 : *pder = OPENSSL_malloc(os->length);
123 : inc = 0;
124 : } else
125 : inc = 1;
126 :
127 0 : memcpy(*pder, os->data, os->length);
128 :
129 0 : if (inc)
130 0 : *pder += os->length;
131 : }
132 :
133 0 : return os->length;
134 : }
135 :
136 : #endif
137 :
138 : const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
139 : EVP_PKEY_HMAC,
140 : EVP_PKEY_HMAC,
141 : 0,
142 :
143 : "HMAC",
144 : "OpenSSL HMAC method",
145 :
146 : 0, 0, 0, 0,
147 :
148 : 0, 0, 0,
149 :
150 : hmac_size,
151 : 0,
152 : 0, 0, 0, 0, 0, 0, 0,
153 :
154 : hmac_key_free,
155 : hmac_pkey_ctrl,
156 : #ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
157 : old_hmac_decode,
158 : old_hmac_encode
159 : #else
160 : 0, 0
161 : #endif
162 : };
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