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move kex to kex*.c, used dispatch_set() callbacks for kex. should
make rekeying easier.

/*	$OpenBSD: dh.h,v 1.5 2001/04/03 19:53:29 markus Exp $	*/

/*
 * Copyright (c) 2000 Niels Provos.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef DH_H
#define DH_H

struct dhgroup {
	int size;
	BIGNUM *g;
	BIGNUM *p;
};

DH	*choose_dh(int min, int nbits, int max);
DH	*dh_new_group_asc(const char *, const char *);
DH	*dh_new_group(BIGNUM *, BIGNUM *);
DH	*dh_new_group1(void);

void	dh_gen_key(DH *, int);
int	dh_pub_is_valid(DH *dh, BIGNUM *dh_pub);

int	dh_estimate(int bits);

#define DH_GRP_MIN	1024
#define DH_GRP_MAX	8192

#endif