/*	$OpenBSD: kex.h,v 1.18 2001/04/03 19:53:29 markus Exp $	*/

/*
 * Copyright (c) 2000 Markus Friedl.  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 KEX_H
#define KEX_H

#include <openssl/evp.h>
#include "buffer.h"
#include "cipher.h"
#include "key.h"

#define	KEX_DH1		"diffie-hellman-group1-sha1"
#define	KEX_DHGEX	"diffie-hellman-group-exchange-sha1"

enum kex_init_proposals {
	PROPOSAL_KEX_ALGS,
	PROPOSAL_SERVER_HOST_KEY_ALGS,
	PROPOSAL_ENC_ALGS_CTOS,
	PROPOSAL_ENC_ALGS_STOC,
	PROPOSAL_MAC_ALGS_CTOS,
	PROPOSAL_MAC_ALGS_STOC,
	PROPOSAL_COMP_ALGS_CTOS,
	PROPOSAL_COMP_ALGS_STOC,
	PROPOSAL_LANG_CTOS,
	PROPOSAL_LANG_STOC,
	PROPOSAL_MAX
};

enum kex_modes {
	MODE_IN,
	MODE_OUT,
	MODE_MAX
};

enum kex_exchange {
	DH_GRP1_SHA1,
	DH_GEX_SHA1
};

typedef struct Kex Kex;
typedef struct Mac Mac;
typedef struct Comp Comp;
typedef struct Enc Enc;

struct Enc {
	char		*name;
	Cipher		*cipher;
	int		enabled;
	u_char	*key;
	u_char	*iv;
};
struct Mac {
	char		*name;
	int		enabled;
	EVP_MD		*md;
	int		mac_len;
	u_char	*key;
	int		key_len;
};
struct Comp {
	int		type;
	int		enabled;
	char		*name;
};
#define KEX_INIT_SENT	0x0001
struct Kex {
	Enc		enc [MODE_MAX];
	Mac		mac [MODE_MAX];
	Comp		comp[MODE_MAX];
	int		we_need;
	int		server;
	char		*name;
	int		hostkey_type;
	int		kex_type;

	/* used during kex */
	Buffer		my;
	Buffer		peer;
	int		newkeys;
	int		flags;
	void		*state;
	char		*client_version_string;
	char		*server_version_string;

	int		(*check_host_key)(Key *hostkey);
	Key		*(*load_host_key)(int type);
};

void	kex_derive_keys(Kex *k, u_char *hash, BIGNUM *shared_secret);
void	packet_set_kex(Kex *k);
Kex	*kex_start(char *proposal[PROPOSAL_MAX]);
void	kex_send_newkeys(void);
void	kex_protocol_error(int type, int plen, void *ctxt);

void	kexdh(Kex *);
void	kexgex(Kex *);

#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
void	dump_digest(char *msg, u_char *digest, int len);
#endif

#endif