[openssh.git] / kex.h

/*	$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
Commit	Line	Data
a5c9ffdb	1	/* $OpenBSD: kex.h,v 1.18 2001/04/03 19:53:29 markus Exp $ */
23c2a7a5	2
7e7327a1	3	/*
	4	* Copyright (c) 2000 Markus Friedl. All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
7e7327a1	14	*
	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	17	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	18	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	19	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	20	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	21	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	22	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	23	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	24	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	25	*/
	26	#ifndef KEX_H
	27	#define KEX_H
	28
b2552997	29	#include <openssl/evp.h>
b2552997	30	#include "buffer.h"
a5c9ffdb	31	#include "cipher.h"
a5c9ffdb	32	#include "key.h"
b2552997	33
94ec8c6b	34	#define KEX_DH1 "diffie-hellman-group1-sha1"
94ec8c6b	35	#define KEX_DHGEX "diffie-hellman-group-exchange-sha1"
7e7327a1	36
	37	enum kex_init_proposals {
	38	PROPOSAL_KEX_ALGS,
	39	PROPOSAL_SERVER_HOST_KEY_ALGS,
	40	PROPOSAL_ENC_ALGS_CTOS,
	41	PROPOSAL_ENC_ALGS_STOC,
	42	PROPOSAL_MAC_ALGS_CTOS,
	43	PROPOSAL_MAC_ALGS_STOC,
	44	PROPOSAL_COMP_ALGS_CTOS,
	45	PROPOSAL_COMP_ALGS_STOC,
	46	PROPOSAL_LANG_CTOS,
	47	PROPOSAL_LANG_STOC,
	48	PROPOSAL_MAX
	49	};
	50
	51	enum kex_modes {
	52	MODE_IN,
	53	MODE_OUT,
	54	MODE_MAX
	55	};
	56
94ec8c6b	57	enum kex_exchange {
	58	DH_GRP1_SHA1,
	59	DH_GEX_SHA1
	60	};
2b87da3b	61
7e7327a1	62	typedef struct Kex Kex;
	63	typedef struct Mac Mac;
	64	typedef struct Comp Comp;
	65	typedef struct Enc Enc;
	66
	67	struct Enc {
94ec8c6b	68	char *name;
94ec8c6b	69	Cipher *cipher;
7e7327a1	70	int enabled;
1e3b8b07	71	u_char *key;
1e3b8b07	72	u_char *iv;
7e7327a1	73	};
7e7327a1	74	struct Mac {
94ec8c6b	75	char *name;
7e7327a1	76	int enabled;
94ec8c6b	77	EVP_MD *md;
7e7327a1	78	int mac_len;
1e3b8b07	79	u_char *key;
7e7327a1	80	int key_len;
7e7327a1	81	};
	82	struct Comp {
	83	int type;
	84	int enabled;
	85	char *name;
	86	};
a5c9ffdb	87	#define KEX_INIT_SENT 0x0001
7e7327a1	88	struct Kex {
	89	Enc enc [MODE_MAX];
	90	Mac mac [MODE_MAX];
	91	Comp comp[MODE_MAX];
	92	int we_need;
	93	int server;
	94	char *name;
fa08c86b	95	int hostkey_type;
94ec8c6b	96	int kex_type;
a5c9ffdb	97
	98	/* used during kex */
	99	Buffer my;
	100	Buffer peer;
	101	int newkeys;
	102	int flags;
	103	void *state;
	104	char *client_version_string;
	105	char *server_version_string;
	106
	107	int (check_host_key)(Key hostkey);
	108	Key (load_host_key)(int type);
7e7327a1	109	};
7e7327a1	110
a5c9ffdb	111	void kex_derive_keys(Kex k, u_char hash, BIGNUM *shared_secret);
7e7327a1	112	void packet_set_kex(Kex *k);
a5c9ffdb	113	Kex kex_start(char proposal[PROPOSAL_MAX]);
	114	void kex_send_newkeys(void);
	115	void kex_protocol_error(int type, int plen, void *ctxt);
7e7327a1	116
a5c9ffdb	117	void kexdh(Kex *);
	118	void kexgex(Kex *);
	119
	120	#if defined(DEBUG_KEX) \|\| defined(DEBUG_KEXDH)
	121	void dump_digest(char msg, u_char digest, int len);
	122	#endif
7e7327a1	123
7e7327a1	124	#endif