1 /* $OpenBSD: cm_ameth.c,v 1.8 2021/12/12 21:30:13 tb Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3  * project 2010.
4  */
5 /* ====================================================================
6  * Copyright (c) 2010 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 
54 #include <stdio.h>
55 
56 #include <openssl/cmac.h>
57 #include <openssl/evp.h>
58 
59 #include "asn1_locl.h"
60 #include "evp_locl.h"
61 
62 /* CMAC "ASN1" method. This is just here to indicate the
63  * maximum CMAC output length and to free up a CMAC
64  * key.
65  */
66 
67 static int
68 cmac_size(const EVP_PKEY *pkey)
69 {
70 	return EVP_MAX_BLOCK_LENGTH;
71 }
72 
73 static void
74 cmac_key_free(EVP_PKEY *pkey)
75 {
76 	CMAC_CTX *cmctx = (CMAC_CTX *)pkey->pkey.ptr;
77 
78 	CMAC_CTX_free(cmctx);
79 }
80 
81 const EVP_PKEY_ASN1_METHOD cmac_asn1_meth = {
82 	.pkey_id = EVP_PKEY_CMAC,
83 	.pkey_base_id = EVP_PKEY_CMAC,
84 
85 	.pem_str = "CMAC",
86 	.info = "OpenSSL CMAC method",
87 
88 	.pkey_size = cmac_size,
89 	.pkey_free = cmac_key_free
90 };
91