1/*
2 * Dropbear - a SSH2 server
3 *
4 * Copyright (c) 2002,2003 Matt Johnston
5 * All rights reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE. */
24
25#ifndef _ALGO_H_
26
27#define _ALGO_H_
28
29#include "includes.h"
30#include "buffer.h"
31
32struct Algo_Type {
33
34	unsigned char *name; /* identifying name */
35	char val; /* a value for this cipher, or -1 for invalid */
36	void *data; /* algorithm specific data */
37	unsigned usable : 1; /* whether we can use this algorithm */
38
39};
40
41typedef struct Algo_Type algo_type;
42
43/* lists mapping ssh types of algorithms to internal values */
44extern algo_type sshkex[];
45extern algo_type sshhostkey[];
46extern algo_type sshciphers[];
47extern algo_type sshhashes[];
48extern algo_type sshcompress[];
49
50extern const struct dropbear_cipher dropbear_nocipher;
51extern const struct dropbear_hash dropbear_nohash;
52
53struct dropbear_cipher {
54	const struct ltc_cipher_descriptor *cipherdesc;
55	unsigned long keysize;
56	unsigned char blocksize;
57};
58
59struct dropbear_hash {
60	const struct ltc_hash_descriptor *hashdesc;
61	unsigned long keysize;
62	unsigned char hashsize;
63};
64
65void crypto_init();
66int have_algo(char* algo, size_t algolen, algo_type algos[]);
67void buf_put_algolist(buffer * buf, algo_type localalgos[]);
68
69algo_type * svr_buf_match_algo(buffer* buf, algo_type localalgos[],
70		int *goodguess);
71algo_type * cli_buf_match_algo(buffer* buf, algo_type localalgos[],
72		int *goodguess);
73
74#endif /* _ALGO_H_ */
75