release/src/router/dropbear/algo.h

   1 /*
   2  * Dropbear - a SSH2 server
   3  *
   4  * Copyright (c) 2002,2003 Matt Johnston
   5  * All rights reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE. */
  24
  25 #ifndef _ALGO_H_
  26
  27 #define _ALGO_H_
  28
  29 #include "includes.h"
  30 #include "buffer.h"
  31
  32 #define DROPBEAR_MODE_UNUSED 0
  33 #define DROPBEAR_MODE_CBC 1
  34 #define DROPBEAR_MODE_CTR 2
  35
  36 struct Algo_Type {
  37
  38         unsigned char *name; /* identifying name */
  39         char val; /* a value for this cipher, or -1 for invalid */
  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' */
  44 };
  45
  46 typedef struct Algo_Type algo_type;
  47
  48 /* lists mapping ssh types of algorithms to internal values */
  49 extern algo_type sshkex[];
  50 extern algo_type sshhostkey[];
  51 extern algo_type sshciphers[];
  52 extern algo_type sshhashes[];
  53 extern algo_type ssh_compress[];
  54 extern algo_type ssh_nocompress[];
  55
  56 extern const struct dropbear_cipher dropbear_nocipher;
  57 extern const struct dropbear_cipher_mode dropbear_mode_none;
  58 extern const struct dropbear_hash dropbear_nohash;
  59
  60 struct dropbear_cipher {
  61         const struct ltc_cipher_descriptor *cipherdesc;
  62         unsigned long keysize;
  63         unsigned char blocksize;
  64 };
  65
  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
  76 struct dropbear_hash {
  77         const struct ltc_hash_descriptor *hashdesc;
  78         unsigned long keysize;
  79         unsigned char hashsize;
  80 };
  81
  82 void crypto_init();
  83 int have_algo(char* algo, size_t algolen, algo_type algos[]);
  84 void buf_put_algolist(buffer * buf, algo_type localalgos[]);
  85
  86 algo_type * svr_buf_match_algo(buffer* buf, algo_type localalgos[],
  87                 int *goodguess);
  88 algo_type * cli_buf_match_algo(buffer* buf, algo_type localalgos[],
  89                 int *goodguess);
  90
  91 #endif /* _ALGO_H_ */