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 	};
167 
168