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/*
* Copyright (c) 2000 Markus Friedl. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 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 AUTHOR 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.
*/
#include "includes.h"
RCSID("$OpenBSD: hmac.c,v 1.6 2001/01/21 19:05:49 markus Exp $");
#include "xmalloc.h"
#include "getput.h"
#include "log.h"
#include <openssl/hmac.h>
u_char *
hmac(
EVP_MD *evp_md,
u_int seqno,
u_char *data, int datalen,
u_char *key, int keylen)
{
HMAC_CTX c;
static u_char m[EVP_MAX_MD_SIZE];
u_char b[4];
if (key == NULL)
fatal("hmac: no key");
HMAC_Init(&c, key, keylen, evp_md);
PUT_32BIT(b, seqno);
HMAC_Update(&c, b, sizeof b);
HMAC_Update(&c, data, datalen);
HMAC_Final(&c, m, NULL);
HMAC_cleanup(&c);
return(m);
}
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