blob: 27590ec8067b805542b9138c8fd4ce19b4f7e10a [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.
12 * 3. All advertising materials mentioning features or use of this software
13 * must display the following acknowledgement:
14 * This product includes software developed by Markus Friedl.
15 * 4. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include "includes.h"
Damien Miller6536c7d2000-06-22 21:32:31 +100031RCSID("$OpenBSD: hmac.c,v 1.3 2000/06/20 01:39:41 markus Exp $");
Damien Millera664e872000-04-16 11:52:47 +100032
33#include "xmalloc.h"
34#include "ssh.h"
35#include "getput.h"
36
37#include <openssl/hmac.h>
38
39unsigned char *
40hmac(
41 EVP_MD *evp_md,
42 unsigned int seqno,
43 unsigned char *data, int datalen,
44 unsigned char *key, int keylen)
45{
46 HMAC_CTX c;
47 static unsigned char m[EVP_MAX_MD_SIZE];
48 unsigned char b[4];
49
50 if (key == NULL)
51 fatal("hmac: no key");
52 HMAC_Init(&c, key, keylen, evp_md);
53 PUT_32BIT(b, seqno);
54 HMAC_Update(&c, b, sizeof b);
55 HMAC_Update(&c, data, datalen);
56 HMAC_Final(&c, m, NULL);
57 HMAC_cleanup(&c);
58 return(m);
59}