kex.h revision 61209 
1/*
2 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. All advertising materials mentioning features or use of this software
13 *    must display the following acknowledgement:
14 *      This product includes software developed by Markus Friedl.
15 * 4. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29#ifndef KEX_H
30#define KEX_H
31
32#define	KEX_DH1	"diffie-hellman-group1-sha1"
33#define KEX_DSS	"ssh-dss"
34
35enum kex_init_proposals {
36	PROPOSAL_KEX_ALGS,
37	PROPOSAL_SERVER_HOST_KEY_ALGS,
38	PROPOSAL_ENC_ALGS_CTOS,
39	PROPOSAL_ENC_ALGS_STOC,
40	PROPOSAL_MAC_ALGS_CTOS,
41	PROPOSAL_MAC_ALGS_STOC,
42	PROPOSAL_COMP_ALGS_CTOS,
43	PROPOSAL_COMP_ALGS_STOC,
44	PROPOSAL_LANG_CTOS,
45	PROPOSAL_LANG_STOC,
46	PROPOSAL_MAX
47};
48
49enum kex_modes {
50	MODE_IN,
51	MODE_OUT,
52	MODE_MAX
53};
54
55typedef struct Kex Kex;
56typedef struct Mac Mac;
57typedef struct Comp Comp;
58typedef struct Enc Enc;
59
60struct Enc {
61	int		type;
62	int		enabled;
63	int		block_size;
64	unsigned char	*key;
65	unsigned char	*iv;
66	int		key_len;
67	int		iv_len;
68	char		*name;
69};
70struct Mac {
71	EVP_MD		*md;
72	int		enabled;
73	int		mac_len;
74	unsigned char	*key;
75	int		key_len;
76	char		*name;
77};
78struct Comp {
79	int		type;
80	int		enabled;
81	char		*name;
82};
83struct Kex {
84	Enc		enc [MODE_MAX];
85	Mac		mac [MODE_MAX];
86	Comp		comp[MODE_MAX];
87	int		we_need;
88	int		server;
89	char		*name;
90	char		*hostkeyalg;
91};
92
93Buffer	*kex_init(char *myproposal[PROPOSAL_MAX]);
94void
95kex_exchange_kexinit(
96    Buffer *my_kexinit, Buffer *peer_kexint,
97    char *peer_proposal[PROPOSAL_MAX]);
98Kex *
99kex_choose_conf(char *cprop[PROPOSAL_MAX],
100    char *sprop[PROPOSAL_MAX], int server);
101int	kex_derive_keys(Kex *k, unsigned char *hash, BIGNUM *shared_secret);
102void	packet_set_kex(Kex *k);
103int	dh_pub_is_valid(DH *dh, BIGNUM *dh_pub);
104DH	*dh_new_group1();
105
106unsigned char *
107kex_hash(
108    char *client_version_string,
109    char *server_version_string,
110    char *ckexinit, int ckexinitlen,
111    char *skexinit, int skexinitlen,
112    char *serverhostkeyblob, int sbloblen,
113    BIGNUM *client_dh_pub,
114    BIGNUM *server_dh_pub,
115    BIGNUM *shared_secret);
116
117#endif
118