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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 
32 struct 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 
41 typedef struct Algo_Type algo_type;
42 
43 /* lists mapping ssh types of algorithms to internal values */
44 extern algo_type sshkex[];
45 extern algo_type sshhostkey[];
46 extern algo_type sshciphers[];
47 extern algo_type sshhashes[];
48 extern algo_type sshcompress[];
49 
50 extern const struct dropbear_cipher dropbear_nocipher;
51 extern const struct dropbear_hash dropbear_nohash;
52 
53 struct dropbear_cipher {
54 	const struct ltc_cipher_descriptor *cipherdesc;
55 	unsigned long keysize;
56 	unsigned char blocksize;
57 };
58 
59 struct dropbear_hash {
60 	const struct ltc_hash_descriptor *hashdesc;
61 	unsigned long keysize;
62 	unsigned char hashsize;
63 };
64 
65 void crypto_init();
66 int have_algo(char* algo, size_t algolen, algo_type algos[]);
67 void buf_put_algolist(buffer * buf, algo_type localalgos[]);
68 
69 algo_type * svr_buf_match_algo(buffer* buf, algo_type localalgos[],
70 		int *goodguess);
71 algo_type * cli_buf_match_algo(buffer* buf, algo_type localalgos[],
72 		int *goodguess);
73 
74 #endif /* _ALGO_H_ */
75