Mercurial > dropbear

annotate algo.h @ 1702:8f93f37c01de

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Allow DH to be completely disabled (#97) Reduces binary size by ~2kB by default and by 21kB with no other libtommath functions users, ex. with curve25519 kex and ed25519 key only.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Thu, 28 May 2020 20:01:48 +0500
parents 41bf8f216644
children
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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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26
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27 #define DROPBEAR_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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37
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38 const 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 sigalgs[];
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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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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 int (*aead_crypt)(unsigned int seq,
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76 const unsigned char *in, unsigned char *out,
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77 unsigned long len, unsigned long taglen,
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78 void *cipher_state, int direction);
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79 int (*aead_getlength)(unsigned int seq,
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80 const unsigned char *in, unsigned int *outlen,
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81 unsigned long len, void *cipher_state);
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82 const struct dropbear_hash *aead_mac;
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83 };
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84
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85 struct dropbear_hash {
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86 const struct ltc_hash_descriptor *hash_desc;
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87 const unsigned long keysize;
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88 /* hashsize may be truncated from the size returned by hash_desc,
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89 eg sha1-96 */
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90 const unsigned char hashsize;
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91 };
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92
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93 enum dropbear_kex_mode {
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94 #if DROPBEAR_NORMAL_DH
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95 DROPBEAR_KEX_NORMAL_DH,
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96 #endif
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97 #if DROPBEAR_ECDH
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98 DROPBEAR_KEX_ECDH,
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99 #endif
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100 #if DROPBEAR_CURVE25519
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101 DROPBEAR_KEX_CURVE25519,
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102 #endif
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103 };
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104
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105 struct dropbear_kex {
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106 enum dropbear_kex_mode mode;
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107
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108 /* "normal" DH KEX */
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109 const unsigned char *dh_p_bytes;
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110 const int dh_p_len;
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111
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112 /* elliptic curve DH KEX */
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113 #if DROPBEAR_ECDH
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114 const struct dropbear_ecc_curve *ecc_curve;
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115 #else
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116 const void* dummy;
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117 #endif
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118
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119 /* both */
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120 const struct ltc_hash_descriptor *hash_desc;
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121 };
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122
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123 /* Includes all algorithms is useall is set */
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124 void buf_put_algolist_all(buffer * buf, const algo_type localalgos[], int useall);
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125 /* Includes "usable" algorithms */
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126 void buf_put_algolist(buffer * buf, const algo_type localalgos[]);
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127
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128 #define KEXGUESS2_ALGO_NAME "[email protected]"
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129
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130 int buf_has_algo(buffer *buf, const char *algo);
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131 algo_type * first_usable_algo(algo_type algos[]);
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132 algo_type * buf_match_algo(buffer* buf, algo_type localalgos[],
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133 int kexguess2, int *goodguess);
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134
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135 #if DROPBEAR_USER_ALGO_LIST
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136 int check_user_algos(const char* user_algo_list, algo_type * algos,
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137 const char *algo_desc);
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138 char * algolist_string(const algo_type algos[]);
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139 #endif
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140
755
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141 enum {
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142 DROPBEAR_COMP_NONE,
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143 DROPBEAR_COMP_ZLIB,
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144 DROPBEAR_COMP_ZLIB_DELAY,
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145 };
682
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146
1036
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147 #endif /* DROPBEAR_ALGO_H_ */