Mercurial > dropbear

annotate algo.h @ 1060:4c733310c21d nocircbuffer

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reword comment for clarity
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Mar 2015 23:26:42 +0800
parents deed0571cacc
children 2052b53d3034
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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 DROPBEAR_ALGO_H_
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27 #define DROPBEAR_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 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_delaycompress[];
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55 extern algo_type ssh_nocompress[];
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56
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57 extern const struct dropbear_cipher dropbear_nocipher;
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58 extern const struct dropbear_cipher_mode dropbear_mode_none;
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59 extern const struct dropbear_hash dropbear_nohash;
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60
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61 struct dropbear_cipher {
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62 const struct ltc_cipher_descriptor *cipherdesc;
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63 const unsigned long keysize;
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64 const unsigned char blocksize;
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65 };
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66
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67 struct dropbear_cipher_mode {
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68 int (*start)(int cipher, const unsigned char *IV,
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69 const unsigned char *key,
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70 int keylen, int num_rounds, void *cipher_state);
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71 int (*encrypt)(const unsigned char *pt, unsigned char *ct,
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72 unsigned long len, void *cipher_state);
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73 int (*decrypt)(const unsigned char *ct, unsigned char *pt,
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74 unsigned long len, void *cipher_state);
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75 };
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76
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77 struct dropbear_hash {
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78 const struct ltc_hash_descriptor *hash_desc;
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79 const unsigned long keysize;
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80 /* hashsize may be truncated from the size returned by hash_desc,
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81 eg sha1-96 */
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82 const unsigned char hashsize;
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83 };
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84
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85 enum dropbear_kex_mode {
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86 DROPBEAR_KEX_NORMAL_DH,
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87 DROPBEAR_KEX_ECDH,
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88 DROPBEAR_KEX_CURVE25519,
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89 };
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90
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91 struct dropbear_kex {
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92 enum dropbear_kex_mode mode;
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93
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94 /* "normal" DH KEX */
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95 const unsigned char *dh_p_bytes;
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96 const int dh_p_len;
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97
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98 /* elliptic curve DH KEX */
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99 #ifdef DROPBEAR_ECDH
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100 const struct dropbear_ecc_curve *ecc_curve;
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101 #else
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102 const void* dummy;
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103 #endif
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104
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105 /* both */
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106 const struct ltc_hash_descriptor *hash_desc;
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107 };
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108
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109 int have_algo(char* algo, size_t algolen, algo_type algos[]);
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110 void buf_put_algolist(buffer * buf, algo_type localalgos[]);
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111
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112 enum kexguess2_used {
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113 KEXGUESS2_LOOK,
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114 KEXGUESS2_NO,
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115 KEXGUESS2_YES,
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116 };
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117
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118 #define KEXGUESS2_ALGO_NAME "[email protected]"
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119 #define KEXGUESS2_ALGO_ID 99
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120
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121
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122 algo_type * buf_match_algo(buffer* buf, algo_type localalgos[],
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123 enum kexguess2_used *kexguess2, int *goodguess);
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124
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125 #ifdef ENABLE_USER_ALGO_LIST
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126 int check_user_algos(const char* user_algo_list, algo_type * algos,
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127 const char *algo_desc);
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128 char * algolist_string(algo_type algos[]);
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129 #endif
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130
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131 enum {
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132 DROPBEAR_COMP_NONE,
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133 DROPBEAR_COMP_ZLIB,
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134 DROPBEAR_COMP_ZLIB_DELAY,
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135 };
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136
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137 #endif /* DROPBEAR_ALGO_H_ */