| /* |
| * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| * All rights reserved |
| * This file contains various auxiliary functions related to multiple |
| * precision integers. |
| * |
| * As far as I am concerned, the code I have written for this software |
| * can be used freely for any purpose. Any derived versions of this |
| * software must be clearly marked as such, and if the derived work is |
| * incompatible with the protocol description in the RFC file, it must be |
| * called by a name other than "ssh" or "Secure Shell". |
| */ |
| |
| #include "includes.h" |
| RCSID("$OpenBSD: mpaux.c,v 1.14 2000/09/07 20:27:52 deraadt Exp $"); |
| |
| #include <openssl/bn.h> |
| #include "getput.h" |
| #include "xmalloc.h" |
| |
| #include <openssl/md5.h> |
| |
| void |
| compute_session_id(unsigned char session_id[16], |
| unsigned char cookie[8], |
| BIGNUM* host_key_n, |
| BIGNUM* session_key_n) |
| { |
| unsigned int host_key_bytes = BN_num_bytes(host_key_n); |
| unsigned int session_key_bytes = BN_num_bytes(session_key_n); |
| unsigned int bytes = host_key_bytes + session_key_bytes; |
| unsigned char *buf = xmalloc(bytes); |
| MD5_CTX md; |
| |
| BN_bn2bin(host_key_n, buf); |
| BN_bn2bin(session_key_n, buf + host_key_bytes); |
| MD5_Init(&md); |
| MD5_Update(&md, buf, bytes); |
| MD5_Update(&md, cookie, 8); |
| MD5_Final(session_id, &md); |
| memset(buf, 0, bytes); |
| xfree(buf); |
| } |