1 /* $OpenBSD: kex.h,v 1.49 2010/02/26 20:29:54 djm Exp $ */
5 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #include <openssl/evp.h>
32 #include <openssl/hmac.h>
34 #define KEX_COOKIE_LEN 16
36 #define KEX_DH1 "diffie-hellman-group1-sha1"
37 #define KEX_DH14 "diffie-hellman-group14-sha1"
38 #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
39 #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
40 #define KEX_RESUME "resume@appgate.com"
44 #define COMP_DELAYED 2
46 enum kex_init_proposals {
48 PROPOSAL_SERVER_HOST_KEY_ALGS,
49 PROPOSAL_ENC_ALGS_CTOS,
50 PROPOSAL_ENC_ALGS_STOC,
51 PROPOSAL_MAC_ALGS_CTOS,
52 PROPOSAL_MAC_ALGS_STOC,
53 PROPOSAL_COMP_ALGS_CTOS,
54 PROPOSAL_COMP_ALGS_STOC,
74 #define KEX_INIT_SENT 0x0001
76 typedef struct Kex Kex;
77 typedef struct Mac Mac;
78 typedef struct Comp Comp;
79 typedef struct Enc Enc;
80 typedef struct Newkeys Newkeys;
100 struct umac_ctx *umac_ctx;
114 u_int session_id_len;
115 Newkeys *newkeys[MODE_MAX];
126 const EVP_MD *evp_md;
127 char *client_version_string;
128 char *server_version_string;
129 int (*verify_host_key)(Key *);
130 Key *(*load_host_public_key)(int);
131 Key *(*load_host_private_key)(int);
132 int (*host_key_index)(Key *);
133 void (*kex[KEX_MAX])(Kex *);
136 #ifdef NONE_CIPHER_ENABLED
137 void kex_prop2buf(Buffer *, char *[PROPOSAL_MAX]);
140 Kex *kex_setup(char *[PROPOSAL_MAX]);
141 void kex_finish(Kex *);
143 void kex_send_kexinit(Kex *);
144 void kex_input_kexinit(int, u_int32_t, void *);
145 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *);
147 Newkeys *kex_get_newkeys(int);
149 void kexdh_client(Kex *);
150 void kexdh_server(Kex *);
151 void kexgex_client(Kex *);
152 void kexgex_server(Kex *);
155 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
156 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
158 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *,
159 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
160 BIGNUM *, BIGNUM *, u_char **, u_int *);
163 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
165 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
166 void dump_digest(char *, u_char *, int);