1 /* $OpenBSD: kex.h,v 1.52 2010/09/22 05:01:29 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>
32 #ifdef OPENSSL_HAS_ECC
33 #include <openssl/ec.h>
36 #define KEX_COOKIE_LEN 16
38 #define KEX_DH1 "diffie-hellman-group1-sha1"
39 #define KEX_DH14 "diffie-hellman-group14-sha1"
40 #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
41 #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
42 #define KEX_RESUME "resume@appgate.com"
43 /* The following represents the family of ECDH methods */
44 #define KEX_ECDH_SHA2_STEM "ecdh-sha2-"
48 #define COMP_DELAYED 2
50 enum kex_init_proposals {
52 PROPOSAL_SERVER_HOST_KEY_ALGS,
53 PROPOSAL_ENC_ALGS_CTOS,
54 PROPOSAL_ENC_ALGS_STOC,
55 PROPOSAL_MAC_ALGS_CTOS,
56 PROPOSAL_MAC_ALGS_STOC,
57 PROPOSAL_COMP_ALGS_CTOS,
58 PROPOSAL_COMP_ALGS_STOC,
82 #define KEX_INIT_SENT 0x0001
84 typedef struct Kex Kex;
85 typedef struct Mac Mac;
86 typedef struct Comp Comp;
87 typedef struct Enc Enc;
88 typedef struct Newkeys Newkeys;
106 const EVP_MD *evp_md;
108 struct umac_ctx *umac_ctx;
122 u_int session_id_len;
123 Newkeys *newkeys[MODE_MAX];
134 const EVP_MD *evp_md;
141 char *client_version_string;
142 char *server_version_string;
143 int (*verify_host_key)(Key *);
144 Key *(*load_host_public_key)(int);
145 Key *(*load_host_private_key)(int);
146 int (*host_key_index)(Key *);
147 void (*kex[KEX_MAX])(Kex *);
150 int kex_names_valid(const char *);
152 Kex *kex_setup(char *[PROPOSAL_MAX]);
153 void kex_finish(Kex *);
155 void kex_send_kexinit(Kex *);
156 void kex_input_kexinit(int, u_int32_t, void *);
157 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *);
159 Newkeys *kex_get_newkeys(int);
161 void kexdh_client(Kex *);
162 void kexdh_server(Kex *);
163 void kexgex_client(Kex *);
164 void kexgex_server(Kex *);
165 void kexecdh_client(Kex *);
166 void kexecdh_server(Kex *);
169 void kexgss_client(Kex *);
170 void kexgss_server(Kex *);
174 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
175 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
177 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *,
178 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
179 BIGNUM *, BIGNUM *, u_char **, u_int *);
180 #ifdef OPENSSL_HAS_ECC
182 kex_ecdh_hash(const EVP_MD *, const EC_GROUP *, char *, char *, char *, int,
183 char *, int, u_char *, int, const EC_POINT *, const EC_POINT *,
184 const BIGNUM *, u_char **, u_int *);
185 int kex_ecdh_name_to_nid(const char *);
186 const EVP_MD *kex_ecdh_name_to_evpmd(const char *);
188 # define kex_ecdh_name_to_nid(x) (-1)
189 # define kex_ecdh_name_to_evpmd(x) (NULL)
193 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
195 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
196 void dump_digest(char *, u_char *, int);