1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * Author: Tatu Ylonen <ylo@cs.hut.fi> 3*0Sstevel@tonic-gate * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland 4*0Sstevel@tonic-gate * All rights reserved 5*0Sstevel@tonic-gate * This file contains various auxiliary functions related to multiple 6*0Sstevel@tonic-gate * precision integers. 7*0Sstevel@tonic-gate * 8*0Sstevel@tonic-gate * As far as I am concerned, the code I have written for this software 9*0Sstevel@tonic-gate * can be used freely for any purpose. Any derived versions of this 10*0Sstevel@tonic-gate * software must be clearly marked as such, and if the derived work is 11*0Sstevel@tonic-gate * incompatible with the protocol description in the RFC file, it must be 12*0Sstevel@tonic-gate * called by a name other than "ssh" or "Secure Shell". 13*0Sstevel@tonic-gate */ 14*0Sstevel@tonic-gate 15*0Sstevel@tonic-gate #include "includes.h" 16*0Sstevel@tonic-gate RCSID("$OpenBSD: mpaux.c,v 1.16 2001/02/08 19:30:52 itojun Exp $"); 17*0Sstevel@tonic-gate 18*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 19*0Sstevel@tonic-gate 20*0Sstevel@tonic-gate #include <openssl/bn.h> 21*0Sstevel@tonic-gate #include "getput.h" 22*0Sstevel@tonic-gate #include "xmalloc.h" 23*0Sstevel@tonic-gate 24*0Sstevel@tonic-gate #include <openssl/md5.h> 25*0Sstevel@tonic-gate 26*0Sstevel@tonic-gate #include "mpaux.h" 27*0Sstevel@tonic-gate 28*0Sstevel@tonic-gate void 29*0Sstevel@tonic-gate compute_session_id(u_char session_id[16], 30*0Sstevel@tonic-gate u_char cookie[8], 31*0Sstevel@tonic-gate BIGNUM* host_key_n, 32*0Sstevel@tonic-gate BIGNUM* session_key_n) 33*0Sstevel@tonic-gate { 34*0Sstevel@tonic-gate u_int host_key_bytes = BN_num_bytes(host_key_n); 35*0Sstevel@tonic-gate u_int session_key_bytes = BN_num_bytes(session_key_n); 36*0Sstevel@tonic-gate u_int bytes = host_key_bytes + session_key_bytes; 37*0Sstevel@tonic-gate u_char *buf = xmalloc(bytes); 38*0Sstevel@tonic-gate MD5_CTX md; 39*0Sstevel@tonic-gate 40*0Sstevel@tonic-gate BN_bn2bin(host_key_n, buf); 41*0Sstevel@tonic-gate BN_bn2bin(session_key_n, buf + host_key_bytes); 42*0Sstevel@tonic-gate MD5_Init(&md); 43*0Sstevel@tonic-gate MD5_Update(&md, buf, bytes); 44*0Sstevel@tonic-gate MD5_Update(&md, cookie, 8); 45*0Sstevel@tonic-gate MD5_Final(session_id, &md); 46*0Sstevel@tonic-gate memset(buf, 0, bytes); 47*0Sstevel@tonic-gate xfree(buf); 48*0Sstevel@tonic-gate } 49