1 /* $OpenBSD: kex.h,v 1.47 2009/05/27 06:34:36 andreas 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"
42 #define COMP_DELAYED 2
44 enum kex_init_proposals {
46 PROPOSAL_SERVER_HOST_KEY_ALGS,
47 PROPOSAL_ENC_ALGS_CTOS,
48 PROPOSAL_ENC_ALGS_STOC,
49 PROPOSAL_MAC_ALGS_CTOS,
50 PROPOSAL_MAC_ALGS_STOC,
51 PROPOSAL_COMP_ALGS_CTOS,
52 PROPOSAL_COMP_ALGS_STOC,
72 #define KEX_INIT_SENT 0x0001
74 typedef struct Kex Kex;
75 typedef struct Mac Mac;
76 typedef struct Comp Comp;
77 typedef struct Enc Enc;
78 typedef struct Newkeys Newkeys;
98 struct umac_ctx *umac_ctx;
112 u_int session_id_len;
113 Newkeys *newkeys[MODE_MAX];
123 const EVP_MD *evp_md;
124 char *client_version_string;
125 char *server_version_string;
126 int (*verify_host_key)(Key *);
127 Key *(*load_host_key)(int);
128 int (*host_key_index)(Key *);
129 void (*kex[KEX_MAX])(Kex *);
132 void kex_prop2buf(Buffer *, char *proposal[PROPOSAL_MAX]);
134 Kex *kex_setup(char *[PROPOSAL_MAX]);
135 void kex_finish(Kex *);
137 void kex_send_kexinit(Kex *);
138 void kex_input_kexinit(int, u_int32_t, void *);
139 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *);
141 Newkeys *kex_get_newkeys(int);
143 void kexdh_client(Kex *);
144 void kexdh_server(Kex *);
145 void kexgex_client(Kex *);
146 void kexgex_server(Kex *);
149 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
150 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
152 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *,
153 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
154 BIGNUM *, BIGNUM *, u_char **, u_int *);
157 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
159 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
160 void dump_digest(char *, u_char *, int);