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annotate algo.h @ 759:76fba0856749 ecc

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More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, ses.hash and ses.session_id are now buffers (doesn't compile)
author Matt Johnston <matt@ucc.asn.au>
date Fri, 29 Mar 2013 00:28:09 +0800
parents bf9dc2d9c2b1
children ac2158e3e403
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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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28
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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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37
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38 const unsigned char *name; /* identifying name */
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39 const 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 ssh_compress[];
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54 extern algo_type ssh_nocompress[];
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56 extern const struct dropbear_cipher dropbear_nocipher;
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57 extern const struct dropbear_cipher_mode dropbear_mode_none;
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58 extern const struct dropbear_hash dropbear_nohash;
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59
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60 struct dropbear_cipher {
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61 const struct ltc_cipher_descriptor *cipherdesc;
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62 const unsigned long keysize;
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63 const unsigned char blocksize;
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64 };
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65
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66 struct dropbear_cipher_mode {
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67 int (*start)(int cipher, const unsigned char *IV,
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68 const unsigned char *key,
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69 int keylen, int num_rounds, void *cipher_state);
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70 int (*encrypt)(const unsigned char *pt, unsigned char *ct,
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71 unsigned long len, void *cipher_state);
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72 int (*decrypt)(const unsigned char *ct, unsigned char *pt,
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73 unsigned long len, void *cipher_state);
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74 };
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75
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76 struct dropbear_hash {
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77 const struct ltc_hash_descriptor *hashdesc;
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78 const unsigned long keysize;
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79 const unsigned char hashsize;
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80 };
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81
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82 struct dropbear_kex {
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83 // "normal" DH KEX
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84 const unsigned char *dh_p_bytes;
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85 const int dh_p_len;
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86
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87 // elliptic curve DH KEX
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88 #ifdef DROPBEAR_ECDH
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89 const struct dropbear_ecc_curve *ecc_curve;
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90 #endif
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91
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92 // both
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93 const struct ltc_hash_descriptor *hashdesc;
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94 };
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95
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96 void crypto_init();
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97 int have_algo(char* algo, size_t algolen, algo_type algos[]);
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98 void buf_put_algolist(buffer * buf, algo_type localalgos[]);
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99
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100 algo_type * svr_buf_match_algo(buffer* buf, algo_type localalgos[],
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101 int *goodguess);
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102 algo_type * cli_buf_match_algo(buffer* buf, algo_type localalgos[],
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103 int *goodguess);
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104
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105 #ifdef ENABLE_USER_ALGO_LIST
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106 int check_user_algos(const char* user_algo_list, algo_type * algos,
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107 const char *algo_desc);
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108 char * algolist_string(algo_type algos[]);
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109 #endif
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110
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111 #ifdef DROPBEAR_ECDH
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112 #define IS_NORMAL_DH(algo) ((algo)->dh_p_bytes != NULL)
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113 #else
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114 #define IS_NORMAL_DH(algo) 1
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115 #endif
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116
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117 enum {
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118 DROPBEAR_COMP_NONE,
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119 DROPBEAR_COMP_ZLIB,
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120 DROPBEAR_COMP_ZLIB_DELAY,
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121 };
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122
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123
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124 #endif /* _ALGO_H_ */