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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 1.3 1999/09/30 17:08:52 deraadt Exp $");
#include <ssl/bn.h>
#include "getput.h"
#include "xmalloc.h"
#include <md5.h>
void
compute_session_id(unsigned char session_id[16],
unsigned char cookie[8],
unsigned int host_key_bits,
BIGNUM *host_key_n,
unsigned int session_key_bits,
BIGNUM *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);
MD5Init(&md);
MD5Update(&md, buf, bytes);
MD5Final(session_id, &md);
xfree(buf);
}
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