1 /* $OpenBSD: kex.h,v 1.46 2007/06/07 19:37:34 pvalchev 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_DH1 "diffie-hellman-group1-sha1"
34 #define KEX_DH14 "diffie-hellman-group14-sha1"
35 #define KEX_DHGEX_SHA1 "diffie-hellman-group-exchange-sha1"
36 #define KEX_DHGEX_SHA256 "diffie-hellman-group-exchange-sha256"
40 #define COMP_DELAYED 2
42 enum kex_init_proposals {
44 PROPOSAL_SERVER_HOST_KEY_ALGS,
45 PROPOSAL_ENC_ALGS_CTOS,
46 PROPOSAL_ENC_ALGS_STOC,
47 PROPOSAL_MAC_ALGS_CTOS,
48 PROPOSAL_MAC_ALGS_STOC,
49 PROPOSAL_COMP_ALGS_CTOS,
50 PROPOSAL_COMP_ALGS_STOC,
70 #define KEX_INIT_SENT 0x0001
72 typedef struct Kex Kex;
73 typedef struct Mac Mac;
74 typedef struct Comp Comp;
75 typedef struct Enc Enc;
76 typedef struct Newkeys Newkeys;
96 struct umac_ctx *umac_ctx;
110 u_int session_id_len;
111 Newkeys *newkeys[MODE_MAX];
121 const EVP_MD *evp_md;
122 char *client_version_string;
123 char *server_version_string;
124 int (*verify_host_key)(Key *);
125 Key *(*load_host_key)(int);
126 int (*host_key_index)(Key *);
127 void (*kex[KEX_MAX])(Kex *);
130 Kex *kex_setup(char *[PROPOSAL_MAX]);
131 void kex_finish(Kex *);
133 void kex_send_kexinit(Kex *);
134 void kex_input_kexinit(int, u_int32_t, void *);
135 void kex_derive_keys(Kex *, u_char *, u_int, BIGNUM *);
137 Newkeys *kex_get_newkeys(int);
139 void kexdh_client(Kex *);
140 void kexdh_server(Kex *);
141 void kexgex_client(Kex *);
142 void kexgex_server(Kex *);
145 kex_dh_hash(char *, char *, char *, int, char *, int, u_char *, int,
146 BIGNUM *, BIGNUM *, BIGNUM *, u_char **, u_int *);
148 kexgex_hash(const EVP_MD *, char *, char *, char *, int, char *,
149 int, u_char *, int, int, int, int, BIGNUM *, BIGNUM *, BIGNUM *,
150 BIGNUM *, BIGNUM *, u_char **, u_int *);
153 derive_ssh1_session_id(BIGNUM *, BIGNUM *, u_int8_t[8], u_int8_t[16]);
155 #if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
156 void dump_digest(char *, u_char *, int);