5 * Author: Tatu Ylonen <ylo@cs.hut.fi>
7 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
10 * Created: Sun Jul 16 04:29:30 1995 ylo
12 * This file contains various auxiliary functions related to multiple
24 #include <openssl/bn.h>
25 #include <openssl/md5.h>
33 compute_session_id(unsigned char session_id[16],
34 unsigned char cookie[8],
36 BIGNUM* session_key_n)
38 unsigned int host_key_bytes = BN_num_bytes(host_key_n);
39 unsigned int session_key_bytes = BN_num_bytes(session_key_n);
40 unsigned int bytes = host_key_bytes + session_key_bytes;
41 unsigned char *buf = xmalloc(bytes);
44 BN_bn2bin(host_key_n, buf);
45 BN_bn2bin(session_key_n, buf + host_key_bytes);
47 MD5_Update(&md, buf, bytes);
48 MD5_Update(&md, cookie, 8);
49 MD5_Final(session_id, &md);
50 memset(buf, 0, bytes);