1 /* $OpenBSD: kex.h,v 1.49 2010/02/26 20:29:54 djm Exp $ */
4 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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.
30 #include <openssl/evp.h>
31 #include <openssl/hmac.h>
33 #define KEX_COOKIE_LEN 16
35 #define KEX_DH1 "diffie-hellman-group1-sha1"
36 #define KEX_DH14 "diffie-hellman-group14-sha1"
37 #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
38 #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
39 #define KEX_RESUME "resume@appgate.com"
43 #define COMP_DELAYED 2
45 enum kex_init_proposals {
47 PROPOSAL_SERVER_HOST_KEY_ALGS,
48 PROPOSAL_ENC_ALGS_CTOS,
49 PROPOSAL_ENC_ALGS_STOC,
50 PROPOSAL_MAC_ALGS_CTOS,
51 PROPOSAL_MAC_ALGS_STOC,
52 PROPOSAL_COMP_ALGS_CTOS,
53 PROPOSAL_COMP_ALGS_STOC,
73 #define KEX_INIT_SENT 0x0001
75 typedef struct Kex Kex;
76 typedef struct Mac Mac;
77 typedef struct Comp Comp;
78 typedef struct Enc Enc;
79 typedef struct Newkeys Newkeys;
99 struct umac_ctx *umac_ctx;
113 u_int session_id_len;
114 Newkeys *newkeys[MODE_MAX];
125 const EVP_MD *evp_md;
126 char *client_version_string;
127 char *server_version_string;
128 int (*verify_host_key)(Key *);
129 Key *(*load_host_public_key)(int);
130 Key *(*load_host_private_key)(int);
131 int (*host_key_index)(Key *);
132 void (*kex[KEX_MAX])(Kex *);
135 Kex *kex_setup(char *[PROPOSAL_MAX]);
136 void kex_finish(Kex *);
138 void kex_send_kexinit(Kex *);
139 void kex_input_kexinit(int, u_int32_t, void *);
140 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *);
142 Newkeys *kex_get_newkeys(int);
144 void kexdh_client(Kex *);
145 void kexdh_server(Kex *);
146 void kexgex_client(Kex *);
147 void kexgex_server(Kex *);
150 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
151 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
153 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *,
154 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
155 BIGNUM *, BIGNUM *, u_char **, u_int *);
158 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
160 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
161 void dump_digest(char *, u_char *, int);