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#include <openssl/evp.h>
57
58#include <openssl/asn1.h>
59#include <openssl/digest.h>
60#include <openssl/mem.h>
61#include <openssl/obj.h>
62
63#include "internal.h"
64
65
66static int hmac_size(const EVP_PKEY *pkey) { return EVP_MAX_MD_SIZE; }
67
68static void hmac_key_free(EVP_PKEY *pkey) {
69  ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
70  if (os) {
71    if (os->data) {
72      OPENSSL_cleanse(os->data, os->length);
73    }
74    ASN1_OCTET_STRING_free(os);
75  }
76}
77
78static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2) {
79  switch (op) {
80    case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
81      *(int *)arg2 = NID_sha1;
82      return 1;
83
84    default:
85      return -2;
86  }
87}
88
89const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
90    EVP_PKEY_HMAC,       EVP_PKEY_HMAC,         0 /* flags */,
91    "HMAC",              "OpenSSL HMAC method", 0 /* pub_decode */,
92    0 /* pub_encode */,  0 /* pub_cmp */,       0 /* pub_print */,
93    0 /*priv_decode */,  0 /* priv_encode */,   0 /* priv_print */,
94    0 /* pkey_opaque */,
95    hmac_size,           0 /* pkey_bits */,     0 /* param_decode */,
96    0 /* param_encode*/, 0 /* param_missing*/,  0 /* param_copy*/,
97    0 /* param_cmp*/,    0 /* param_print*/,    0 /* sig_print*/,
98    hmac_key_free,       hmac_pkey_ctrl,        0 /* old_priv_decode */,
99    0 /* old_priv_encode */
100};
101