blob: e440d611762ef4fea00673b1c0cc148b324188df [file] [log] [blame]
Damien Millera664e872000-04-16 11:52:47 +10001/*
2 * Copyright (c) 2000 Markus Friedl. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
Damien Millera664e872000-04-16 11:52:47 +100012 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include "includes.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000026RCSID("$OpenBSD: hmac.c,v 1.6 2001/01/21 19:05:49 markus Exp $");
Damien Millera664e872000-04-16 11:52:47 +100027
28#include "xmalloc.h"
Damien Millera664e872000-04-16 11:52:47 +100029#include "getput.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000030#include "log.h"
Damien Millera664e872000-04-16 11:52:47 +100031
32#include <openssl/hmac.h>
33
Ben Lindstrom46c16222000-12-22 01:43:59 +000034u_char *
Damien Millera664e872000-04-16 11:52:47 +100035hmac(
36 EVP_MD *evp_md,
Ben Lindstrom46c16222000-12-22 01:43:59 +000037 u_int seqno,
38 u_char *data, int datalen,
39 u_char *key, int keylen)
Damien Millera664e872000-04-16 11:52:47 +100040{
41 HMAC_CTX c;
Ben Lindstrom46c16222000-12-22 01:43:59 +000042 static u_char m[EVP_MAX_MD_SIZE];
43 u_char b[4];
Damien Millera664e872000-04-16 11:52:47 +100044
45 if (key == NULL)
46 fatal("hmac: no key");
47 HMAC_Init(&c, key, keylen, evp_md);
48 PUT_32BIT(b, seqno);
49 HMAC_Update(&c, b, sizeof b);
50 HMAC_Update(&c, data, datalen);
51 HMAC_Final(&c, m, NULL);
52 HMAC_cleanup(&c);
53 return(m);
54}