1/*
2 * Copyright 2010-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include "internal/cryptlib.h"
12#include <openssl/evp.h>
13#include "crypto/asn1.h"
14
15/*
16 * CMAC "ASN1" method. This is just here to indicate the maximum CMAC output
17 * length and to free up a CMAC key.
18 */
19
20static int cmac_size(const EVP_PKEY *pkey)
21{
22 return EVP_MAX_BLOCK_LENGTH;
23}
24
25static void cmac_key_free(EVP_PKEY *pkey)
26{
27 EVP_MAC_CTX *cmctx = EVP_PKEY_get0(pkey);
28 EVP_MAC *mac = cmctx == NULL ? NULL : EVP_MAC_CTX_mac(cmctx);
29
30 EVP_MAC_CTX_free(cmctx);
31 EVP_MAC_free(mac);
32}
33
34const EVP_PKEY_ASN1_METHOD cmac_asn1_meth = {
35 EVP_PKEY_CMAC,
36 EVP_PKEY_CMAC,
37 0,
38
39 "CMAC",
40 "OpenSSL CMAC method",
41
42 0, 0, 0, 0,
43
44 0, 0, 0,
45
46 cmac_size,
47 0, 0,
48 0, 0, 0, 0, 0, 0, 0,
49
50 cmac_key_free,
51 0,
52 0, 0
53};
54