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/*
* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
* 2007.
*/
/* ====================================================================
* Copyright (c) 2007 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/evp.h>
#include "asn1_locl.h"
#define HMAC_TEST_PRIVATE_KEY_FORMAT
/*
* HMAC "ASN1" method. This is just here to indicate the maximum HMAC output
* length and to free up an HMAC key.
*/
static int hmac_size(const EVP_PKEY *pkey)
{
return EVP_MAX_MD_SIZE;
}
static void hmac_key_free(EVP_PKEY *pkey)
{
ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
if (os) {
if (os->data)
OPENSSL_cleanse(os->data, os->length);
ASN1_OCTET_STRING_free(os);
}
}
static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
{
switch (op) {
case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
*(int *)arg2 = NID_sha256;
return 1;
default:
return -2;
}
}
#ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
/*
* A bogus private key format for test purposes. This is simply the HMAC key
* with "HMAC PRIVATE KEY" in the headers. When enabled the genpkey utility
* can be used to "generate" HMAC keys.
*/
static int old_hmac_decode(EVP_PKEY *pkey,
const unsigned char **pder, int derlen)
{
ASN1_OCTET_STRING *os;
os = ASN1_OCTET_STRING_new();
if (!os || !ASN1_OCTET_STRING_set(os, *pder, derlen))
return 0;
EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, os);
return 1;
}
static int old_hmac_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
int inc;
ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
if (pder) {
if (!*pder) {
*pder = OPENSSL_malloc(os->length);
inc = 0;
} else
inc = 1;
memcpy(*pder, os->data, os->length);
if (inc)
*pder += os->length;
}
return os->length;
}
#endif
const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
EVP_PKEY_HMAC,
EVP_PKEY_HMAC,
0,
"HMAC",
"OpenSSL HMAC method",
0, 0, 0, 0,
0, 0, 0,
hmac_size,
0,
0, 0, 0, 0, 0, 0, 0,
hmac_key_free,
hmac_pkey_ctrl,
#ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
old_hmac_decode,
old_hmac_encode
#else
0, 0
#endif
};
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