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annotate algo.h @ 502:43bbe17d6ba0

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- Add Counter Mode support
author Matt Johnston <matt@ucc.asn.au>
date Mon, 29 Sep 2008 13:53:31 +0000
parents e972be139cb5
children f9b5dc0cba61
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #ifndef _ALGO_H_
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27 #define _ALGO_H_
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29 #include "includes.h"
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30 #include "buffer.h"
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31
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32 #define DROPBEAR_MODE_UNUSED 0
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33 #define DROPBEAR_MODE_CBC 1
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34 #define DROPBEAR_MODE_CTR 2
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35
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36 struct Algo_Type {
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38 unsigned char *name; /* identifying name */
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39 char val; /* a value for this cipher, or -1 for invalid */
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40 const void *data; /* algorithm specific data */
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41 char usable; /* whether we can use this algorithm */
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42 const void *mode; /* the mode, currently only used for ciphers,
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43 points to a 'struct dropbear_cipher_mode' */
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44 };
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45
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46 typedef struct Algo_Type algo_type;
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47
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48 /* lists mapping ssh types of algorithms to internal values */
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49 extern algo_type sshkex[];
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50 extern algo_type sshhostkey[];
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51 extern algo_type sshciphers[];
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52 extern algo_type sshhashes[];
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53 extern algo_type sshcompress[];
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54
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55 extern const struct dropbear_cipher dropbear_nocipher;
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56 extern const struct dropbear_cipher_mode dropbear_mode_none;
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57 extern const struct dropbear_hash dropbear_nohash;
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58
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59 struct dropbear_cipher {
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60 const struct ltc_cipher_descriptor *cipherdesc;
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61 unsigned long keysize;
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62 unsigned char blocksize;
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63 };
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64
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65 struct dropbear_cipher_mode {
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66 int (*start)(int cipher, const unsigned char *IV,
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67 const unsigned char *key,
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68 int keylen, int num_rounds, void *cipher_state);
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69 int (*encrypt)(const unsigned char *pt, unsigned char *ct,
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70 unsigned long len, void *cipher_state);
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71 int (*decrypt)(const unsigned char *ct, unsigned char *pt,
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72 unsigned long len, void *cipher_state);
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73 };
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74
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75 struct dropbear_hash {
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76 const struct ltc_hash_descriptor *hashdesc;
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77 unsigned long keysize;
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78 unsigned char hashsize;
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79 };
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80
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81 void crypto_init();
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82 int have_algo(char* algo, size_t algolen, algo_type algos[]);
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83 void buf_put_algolist(buffer * buf, algo_type localalgos[]);
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84
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85 algo_type * svr_buf_match_algo(buffer* buf, algo_type localalgos[],
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86 int *goodguess);
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87 algo_type * cli_buf_match_algo(buffer* buf, algo_type localalgos[],
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88 int *goodguess);
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90 #endif /* _ALGO_H_ */