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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" | |
31 | RCSID("$Id$"); | |
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 | */ | |
43 | char * | |
44 | fingerprint(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 | } |