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-rw-r--r--fingerprint.c69
1 files changed, 0 insertions, 69 deletions
diff --git a/fingerprint.c b/fingerprint.c
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1/*
2 * Copyright (c) 1999 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"
31RCSID("$OpenBSD: fingerprint.c,v 1.7 2000/06/20 01:39:41 markus Exp $");
32
33#include "ssh.h"
34#include "xmalloc.h"
35#include <openssl/md5.h>
36
37#define FPRINT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x"
38
39/*
40 * Generate key fingerprint in ascii format.
41 * Based on ideas and code from Bjoern Groenvall <bg@sics.se>
42 */
43char *
44fingerprint(BIGNUM *e, BIGNUM *n)
45{
46 static char retval[80];
47 MD5_CTX md;
48 unsigned char d[16];
49 unsigned char *buf;
50 int nlen, elen;
51
52 nlen = BN_num_bytes(n);
53 elen = BN_num_bytes(e);
54
55 buf = xmalloc(nlen + elen);
56
57 BN_bn2bin(n, buf);
58 BN_bn2bin(e, buf + nlen);
59
60 MD5_Init(&md);
61 MD5_Update(&md, buf, nlen + elen);
62 MD5_Final(d, &md);
63 snprintf(retval, sizeof(retval), FPRINT,
64 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7],
65 d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);
66 memset(buf, 0, nlen + elen);
67 xfree(buf);
68 return retval;
69}