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137 lines
3.9 KiB
C
137 lines
3.9 KiB
C
/*
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* Dropbear - a SSH2 server
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*
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* Copyright (c) 2002,2003 Matt Johnston
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE. */
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#ifndef _ALGO_H_
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#define _ALGO_H_
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#include "includes.h"
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#include "buffer.h"
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#define DROPBEAR_MODE_UNUSED 0
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#define DROPBEAR_MODE_CBC 1
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#define DROPBEAR_MODE_CTR 2
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struct Algo_Type {
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const unsigned char *name; /* identifying name */
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char val; /* a value for this cipher, or -1 for invalid */
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const void *data; /* algorithm specific data */
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char usable; /* whether we can use this algorithm */
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const void *mode; /* the mode, currently only used for ciphers,
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points to a 'struct dropbear_cipher_mode' */
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};
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typedef struct Algo_Type algo_type;
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/* lists mapping ssh types of algorithms to internal values */
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extern algo_type sshkex[];
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extern algo_type sshhostkey[];
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extern algo_type sshciphers[];
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extern algo_type sshhashes[];
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extern algo_type ssh_compress[];
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extern algo_type ssh_nocompress[];
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extern const struct dropbear_cipher dropbear_nocipher;
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extern const struct dropbear_cipher_mode dropbear_mode_none;
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extern const struct dropbear_hash dropbear_nohash;
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struct dropbear_cipher {
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const struct ltc_cipher_descriptor *cipherdesc;
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const unsigned long keysize;
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const unsigned char blocksize;
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};
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struct dropbear_cipher_mode {
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int (*start)(int cipher, const unsigned char *IV,
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const unsigned char *key,
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int keylen, int num_rounds, void *cipher_state);
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int (*encrypt)(const unsigned char *pt, unsigned char *ct,
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unsigned long len, void *cipher_state);
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int (*decrypt)(const unsigned char *ct, unsigned char *pt,
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unsigned long len, void *cipher_state);
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};
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struct dropbear_hash {
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const struct ltc_hash_descriptor *hash_desc;
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const unsigned long keysize;
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/* hashsize may be truncated from the size returned by hash_desc,
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eg sha1-96 */
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const unsigned char hashsize;
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};
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enum dropbear_kex_mode {
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DROPBEAR_KEX_NORMAL_DH,
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DROPBEAR_KEX_ECDH,
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DROPBEAR_KEX_CURVE25519,
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};
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struct dropbear_kex {
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enum dropbear_kex_mode mode;
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/* "normal" DH KEX */
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const unsigned char *dh_p_bytes;
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const int dh_p_len;
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/* elliptic curve DH KEX */
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#ifdef DROPBEAR_ECDH
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const struct dropbear_ecc_curve *ecc_curve;
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#else
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const void* dummy;
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#endif
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/* both */
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const struct ltc_hash_descriptor *hash_desc;
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};
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int have_algo(char* algo, size_t algolen, algo_type algos[]);
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void buf_put_algolist(buffer * buf, algo_type localalgos[]);
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enum kexguess2_used {
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KEXGUESS2_LOOK,
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KEXGUESS2_NO,
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KEXGUESS2_YES,
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};
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#define KEXGUESS2_ALGO_NAME "kexguess2@matt.ucc.asn.au"
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#define KEXGUESS2_ALGO_ID 99
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algo_type * buf_match_algo(buffer* buf, algo_type localalgos[],
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enum kexguess2_used *kexguess2, int *goodguess);
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#ifdef ENABLE_USER_ALGO_LIST
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int check_user_algos(const char* user_algo_list, algo_type * algos,
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const char *algo_desc);
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char * algolist_string(algo_type algos[]);
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#endif
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enum {
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DROPBEAR_COMP_NONE,
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DROPBEAR_COMP_ZLIB,
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DROPBEAR_COMP_ZLIB_DELAY,
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};
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#endif /* _ALGO_H_ */
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