kex.h revision 76259 
1/*	$OpenBSD: kex.h,v 1.22 2001/04/04 20:25:37 markus Exp $	*/
2
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.
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
29#include <openssl/evp.h>
30#include "buffer.h"
31#include "cipher.h"
32#include "key.h"
33
34#define	KEX_DH1		"diffie-hellman-group1-sha1"
35#define	KEX_DHGEX	"diffie-hellman-group-exchange-sha1"
36
37enum 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
51enum kex_modes {
52	MODE_IN,
53	MODE_OUT,
54	MODE_MAX
55};
56
57enum kex_exchange {
58	DH_GRP1_SHA1,
59	DH_GEX_SHA1
60};
61
62#define KEX_INIT_SENT	0x0001
63
64typedef struct Kex Kex;
65typedef struct Mac Mac;
66typedef struct Comp Comp;
67typedef struct Enc Enc;
68typedef struct Newkeys Newkeys;
69
70struct Enc {
71	char	*name;
72	Cipher	*cipher;
73	int	enabled;
74	u_char	*key;
75	u_char	*iv;
76};
77struct Mac {
78	char	*name;
79	int	enabled;
80	EVP_MD	*md;
81	int	mac_len;
82	u_char	*key;
83	int	key_len;
84};
85struct Comp {
86	int	type;
87	int	enabled;
88	char	*name;
89};
90struct Newkeys {
91	Enc	enc;
92	Mac	mac;
93	Comp	comp;
94};
95struct Kex {
96	u_char	*session_id;
97	int	session_id_len;
98	Newkeys	*newkeys[MODE_MAX];
99	int	we_need;
100	int	server;
101	char	*name;
102	int	hostkey_type;
103	int	kex_type;
104	Buffer	my;
105	Buffer	peer;
106	int	done;
107	int	flags;
108	char	*client_version_string;
109	char	*server_version_string;
110	int	(*check_host_key)(Key *hostkey);
111	Key	*(*load_host_key)(int type);
112};
113
114Kex	*kex_setup(char *proposal[PROPOSAL_MAX]);
115void	kex_finish(Kex *kex);
116
117void	kex_send_kexinit(Kex *kex);
118void	kex_input_kexinit(int type, int plen, void *ctxt);
119void	kex_derive_keys(Kex *k, u_char *hash, BIGNUM *shared_secret);
120
121void	kexdh(Kex *);
122void	kexgex(Kex *);
123
124Newkeys *kex_get_newkeys(int mode);
125
126#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
127void	dump_digest(char *msg, u_char *digest, int len);
128#endif
129
130#endif
131