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,
79 #define KEX_INIT_SENT 0x0001
81 typedef struct Kex Kex;
82 typedef struct Mac Mac;
83 typedef struct Comp Comp;
84 typedef struct Enc Enc;
85 typedef struct Newkeys Newkeys;
103 const EVP_MD *evp_md;
105 struct umac_ctx *umac_ctx;
119 u_int session_id_len;
120 Newkeys *newkeys[MODE_MAX];
131 const EVP_MD *evp_md;
132 char *client_version_string;
133 char *server_version_string;
134 int (*verify_host_key)(Key *);
135 Key *(*load_host_public_key)(int);
136 Key *(*load_host_private_key)(int);
137 int (*host_key_index)(Key *);
138 void (*kex[KEX_MAX])(Kex *);
141 int kex_names_valid(const char *);
143 void kex_prop2buf(Buffer *, char *proposal[PROPOSAL_MAX]);
145 Kex *kex_setup(char *[PROPOSAL_MAX]);
146 void kex_finish(Kex *);
148 void kex_send_kexinit(Kex *);
149 void kex_input_kexinit(int, u_int32_t, void *);
150 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *);
152 Newkeys *kex_get_newkeys(int);
154 void kexdh_client(Kex *);
155 void kexdh_server(Kex *);
156 void kexgex_client(Kex *);
157 void kexgex_server(Kex *);
158 void kexecdh_client(Kex *);
159 void kexecdh_server(Kex *);
162 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
163 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
165 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *,
166 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
167 BIGNUM *, BIGNUM *, u_char **, u_int *);
168 #ifdef OPENSSL_HAS_ECC
170 kex_ecdh_hash(const EVP_MD *, const EC_GROUP *, char *, char *, char *, int,
171 char *, int, u_char *, int, const EC_POINT *, const EC_POINT *,
172 const BIGNUM *, u_char **, u_int *);
173 int kex_ecdh_name_to_nid(const char *);
174 const EVP_MD *kex_ecdh_name_to_evpmd(const char *);
176 # define kex_ecdh_name_to_nid(x) (-1)
177 # define kex_ecdh_name_to_evpmd(x) (NULL)
181 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
183 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH) || defined(DEBUG_KEXECDH)
184 void dump_digest(char *, u_char *, int);