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
70static int hmac_size(const EVP_PKEY *pkey)
71	{
72	return EVP_MAX_MD_SIZE;
73	}
74
75static 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
87static 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
106static 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
117static 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
141const 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