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/*
*
* mpaux.c
*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
*
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
*
* Created: Sun Jul 16 04:29:30 1995 ylo
*
* This file contains various auxiliary functions related to multiple
* precision integers.
*
*/
#include "includes.h"
RCSID("$Id: mpaux.c,v 1.8 1999/11/24 00:26:02 deraadt Exp $");
#include <ssl/bn.h>
#include "getput.h"
#include "xmalloc.h"
#include <ssl/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_bits = BN_num_bits(host_key_n);
unsigned int session_key_bits = BN_num_bits(session_key_n);
unsigned int bytes = (host_key_bits + 7) / 8 + (session_key_bits + 7) / 8 + 8;
unsigned char *buf = xmalloc(bytes);
MD5_CTX md;
BN_bn2bin(host_key_n, buf);
BN_bn2bin(session_key_n, buf + (host_key_bits + 7) / 8);
memcpy(buf + (host_key_bits + 7) / 8 + (session_key_bits + 7) / 8, cookie, 8);
MD5_Init(&md);
MD5_Update(&md, buf, bytes);
MD5_Final(session_id, &md);
memset(buf, 0, bytes);
xfree(buf);
}
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