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-rw-r--r--mpaux.c46
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1/*
2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
5 * This file contains various auxiliary functions related to multiple
6 * precision integers.
7 *
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 */
14
15#include "includes.h"
16RCSID("$OpenBSD: mpaux.c,v 1.16 2001/02/08 19:30:52 itojun Exp $");
17
18#include <openssl/bn.h>
19#include "getput.h"
20#include "xmalloc.h"
21
22#include <openssl/md5.h>
23
24#include "mpaux.h"
25
26void
27compute_session_id(u_char session_id[16],
28 u_char cookie[8],
29 BIGNUM* host_key_n,
30 BIGNUM* session_key_n)
31{
32 u_int host_key_bytes = BN_num_bytes(host_key_n);
33 u_int session_key_bytes = BN_num_bytes(session_key_n);
34 u_int bytes = host_key_bytes + session_key_bytes;
35 u_char *buf = xmalloc(bytes);
36 MD5_CTX md;
37
38 BN_bn2bin(host_key_n, buf);
39 BN_bn2bin(session_key_n, buf + host_key_bytes);
40 MD5_Init(&md);
41 MD5_Update(&md, buf, bytes);
42 MD5_Update(&md, cookie, 8);
43 MD5_Final(session_id, &md);
44 memset(buf, 0, bytes);
45 xfree(buf);
46}