Mercurial > dropbear
annotate algo.h @ 946:17d874ae93a1
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author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 27 Jul 2014 22:06:26 +0800 |
parents | c19acba28590 |
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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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26 |
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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 |
502 | 32 #define DROPBEAR_MODE_UNUSED 0 |
33 #define DROPBEAR_MODE_CBC 1 | |
34 #define DROPBEAR_MODE_CTR 2 | |
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 */ |
502 | 40 const void *data; /* algorithm specific data */ |
41 char usable; /* whether we can use this algorithm */ | |
42 const void *mode; /* the mode, currently only used for ciphers, | |
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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55 |
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56 extern const struct dropbear_cipher dropbear_nocipher; |
502 | 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 |
502 | 66 struct dropbear_cipher_mode { |
67 int (*start)(int cipher, const unsigned char *IV, | |
68 const unsigned char *key, | |
69 int keylen, int num_rounds, void *cipher_state); | |
70 int (*encrypt)(const unsigned char *pt, unsigned char *ct, | |
71 unsigned long len, void *cipher_state); | |
72 int (*decrypt)(const unsigned char *ct, unsigned char *pt, | |
73 unsigned long len, void *cipher_state); | |
74 }; | |
75 | |
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76 struct dropbear_hash { |
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77 const struct ltc_hash_descriptor *hash_desc; |
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78 const unsigned long keysize; |
857 | 79 /* hashsize may be truncated from the size returned by hash_desc, |
80 eg sha1-96 */ | |
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81 const unsigned char hashsize; |
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82 }; |
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83 |
848 | 84 enum dropbear_kex_mode { |
85 DROPBEAR_KEX_NORMAL_DH, | |
86 DROPBEAR_KEX_ECDH, | |
87 DROPBEAR_KEX_CURVE25519, | |
88 }; | |
89 | |
756 | 90 struct dropbear_kex { |
848 | 91 enum dropbear_kex_mode mode; |
92 | |
93 /* "normal" DH KEX */ | |
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94 const unsigned char *dh_p_bytes; |
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95 const int dh_p_len; |
756 | 96 |
848 | 97 /* elliptic curve DH KEX */ |
756 | 98 #ifdef DROPBEAR_ECDH |
99 const struct dropbear_ecc_curve *ecc_curve; | |
848 | 100 #else |
101 const void* dummy; | |
756 | 102 #endif |
103 | |
848 | 104 /* both */ |
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105 const struct ltc_hash_descriptor *hash_desc; |
756 | 106 }; |
107 | |
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108 int have_algo(char* algo, size_t algolen, algo_type algos[]); |
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109 void buf_put_algolist(buffer * buf, algo_type localalgos[]); |
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110 |
740 | 111 enum kexguess2_used { |
112 KEXGUESS2_LOOK, | |
113 KEXGUESS2_NO, | |
114 KEXGUESS2_YES, | |
115 }; | |
116 | |
117 #define KEXGUESS2_ALGO_NAME "[email protected]" | |
118 #define KEXGUESS2_ALGO_ID 99 | |
119 | |
120 | |
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121 algo_type * buf_match_algo(buffer* buf, algo_type localalgos[], |
740 | 122 enum kexguess2_used *kexguess2, int *goodguess); |
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123 |
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124 #ifdef ENABLE_USER_ALGO_LIST |
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125 int check_user_algos(const char* user_algo_list, algo_type * algos, |
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126 const char *algo_desc); |
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127 char * algolist_string(algo_type algos[]); |
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128 #endif |
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129 |
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130 enum { |
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131 DROPBEAR_COMP_NONE, |
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132 DROPBEAR_COMP_ZLIB, |
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133 DROPBEAR_COMP_ZLIB_DELAY, |
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134 }; |
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135 |
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136 #endif /* _ALGO_H_ */ |