2 * Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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
11 #include "internal/cryptlib.h"
12 #include <openssl/evp.h>
13 #include "internal/asn1_int.h"
16 * HMAC "ASN1" method. This is just here to indicate the maximum HMAC output
17 * length and to free up an HMAC key.
20 static int hmac_size(const EVP_PKEY *pkey)
22 return EVP_MAX_MD_SIZE;
25 static void hmac_key_free(EVP_PKEY *pkey)
27 ASN1_OCTET_STRING *os = EVP_PKEY_get0(pkey);
30 OPENSSL_cleanse(os->data, os->length);
31 ASN1_OCTET_STRING_free(os);
35 static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
38 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
39 *(int *)arg2 = NID_sha256;
47 static int hmac_pkey_public_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
49 return ASN1_OCTET_STRING_cmp(EVP_PKEY_get0(a), EVP_PKEY_get0(b));
52 const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
58 "OpenSSL HMAC method",
60 0, 0, hmac_pkey_public_cmp, 0,