1 /* $OpenBSD: kex.h,v 1.52 2010/09/22 05:01:29 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>
33 #ifdef OPENSSL_HAS_ECC
34 #include <openssl/ec.h>
37 #define KEX_COOKIE_LEN 16
39 #define KEX_DH1 "diffie-hellman-group1-sha1"
40 #define KEX_DH14 "diffie-hellman-group14-sha1"
41 #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
42 #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
43 #define KEX_RESUME "resume@appgate.com"
44 /* The following represents the family of ECDH methods */
45 #define KEX_ECDH_SHA2_STEM "ecdh-sha2-"
49 #define COMP_DELAYED 2
51 enum kex_init_proposals {
53 PROPOSAL_SERVER_HOST_KEY_ALGS,
54 PROPOSAL_ENC_ALGS_CTOS,
55 PROPOSAL_ENC_ALGS_STOC,
56 PROPOSAL_MAC_ALGS_CTOS,
57 PROPOSAL_MAC_ALGS_STOC,
58 PROPOSAL_COMP_ALGS_CTOS,
59 PROPOSAL_COMP_ALGS_STOC,
80 #define KEX_INIT_SENT 0x0001
82 typedef struct Kex Kex;
83 typedef struct Mac Mac;
84 typedef struct Comp Comp;
85 typedef struct Enc Enc;
86 typedef struct Newkeys Newkeys;
104 const EVP_MD *evp_md;
106 struct umac_ctx *umac_ctx;
120 u_int session_id_len;
121 Newkeys *newkeys[MODE_MAX];
132 const EVP_MD *evp_md;
133 char *client_version_string;
134 char *server_version_string;
135 int (*verify_host_key)(Key *);
136 Key *(*load_host_public_key)(int);
137 Key *(*load_host_private_key)(int);
138 int (*host_key_index)(Key *);
139 void (*kex[KEX_MAX])(Kex *);
142 int kex_names_valid(const char *);
144 #ifdef NONE_CIPHER_ENABLED
145 void kex_prop2buf(Buffer *, char *[PROPOSAL_MAX]);
148 Kex *kex_setup(char *[PROPOSAL_MAX]);
149 void kex_finish(Kex *);
151 void kex_send_kexinit(Kex *);
152 void kex_input_kexinit(int, u_int32_t, void *);
153 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *);
155 Newkeys *kex_get_newkeys(int);
157 void kexdh_client(Kex *);
158 void kexdh_server(Kex *);
159 void kexgex_client(Kex *);
160 void kexgex_server(Kex *);
161 void kexecdh_client(Kex *);
162 void kexecdh_server(Kex *);
165 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
166 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
168 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *,
169 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
170 BIGNUM *, BIGNUM *, u_char **, u_int *);
171 #ifdef OPENSSL_HAS_ECC
173 kex_ecdh_hash(const EVP_MD *, const EC_GROUP *, char *, char *, char *, int,
174 char *, int, u_char *, int, const EC_POINT *, const EC_POINT *,
175 const BIGNUM *, u_char **, u_int *);
176 int kex_ecdh_name_to_nid(const char *);
177 const EVP_MD *kex_ecdh_name_to_evpmd(const char *);
179 # define kex_ecdh_name_to_nid(x) (-1)
180 # define kex_ecdh_name_to_evpmd(x) (NULL)
184 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
186 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
187 void dump_digest(char *, u_char *, int);