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/* $OpenBSD: kex.h,v 1.22 2001/04/04 20:25:37 markus Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef KEX_H
#define KEX_H
#include <openssl/evp.h>
#include "buffer.h"
#include "cipher.h"
#include "key.h"
#define KEX_DH1 "diffie-hellman-group1-sha1"
#define KEX_DHGEX "diffie-hellman-group-exchange-sha1"
enum kex_init_proposals {
PROPOSAL_KEX_ALGS,
PROPOSAL_SERVER_HOST_KEY_ALGS,
PROPOSAL_ENC_ALGS_CTOS,
PROPOSAL_ENC_ALGS_STOC,
PROPOSAL_MAC_ALGS_CTOS,
PROPOSAL_MAC_ALGS_STOC,
PROPOSAL_COMP_ALGS_CTOS,
PROPOSAL_COMP_ALGS_STOC,
PROPOSAL_LANG_CTOS,
PROPOSAL_LANG_STOC,
PROPOSAL_MAX
};
enum kex_modes {
MODE_IN,
MODE_OUT,
MODE_MAX
};
enum kex_exchange {
DH_GRP1_SHA1,
DH_GEX_SHA1
};
#define KEX_INIT_SENT 0x0001
typedef struct Kex Kex;
typedef struct Mac Mac;
typedef struct Comp Comp;
typedef struct Enc Enc;
typedef struct Newkeys Newkeys;
struct Enc {
char *name;
Cipher *cipher;
int enabled;
u_char *key;
u_char *iv;
};
struct Mac {
char *name;
int enabled;
EVP_MD *md;
int mac_len;
u_char *key;
int key_len;
};
struct Comp {
int type;
int enabled;
char *name;
};
struct Newkeys {
Enc enc;
Mac mac;
Comp comp;
};
struct Kex {
u_char *session_id;
int session_id_len;
Newkeys *newkeys[MODE_MAX];
int we_need;
int server;
char *name;
int hostkey_type;
int kex_type;
Buffer my;
Buffer peer;
int done;
int flags;
char *client_version_string;
char *server_version_string;
int (*check_host_key)(Key *hostkey);
Key *(*load_host_key)(int type);
};
Kex *kex_setup(char *proposal[PROPOSAL_MAX]);
void kex_finish(Kex *kex);
void kex_send_kexinit(Kex *kex);
void kex_input_kexinit(int type, int plen, void *ctxt);
void kex_derive_keys(Kex *k, u_char *hash, BIGNUM *shared_secret);
void kexdh(Kex *);
void kexgex(Kex *);
Newkeys *kex_get_newkeys(int mode);
#if defined(DEBUG_KEX) || defined(DEBUG_KEXDH)
void dump_digest(char *msg, u_char *digest, int len);
#endif
#endif
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