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/*
* Dropbear - a SSH2 server
*
* Copyright (c) 2002,2003 Matt Johnston
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE. */
#ifndef _ALGO_H_
#define _ALGO_H_
#include "includes.h"
#include "buffer.h"
#define DROPBEAR_MODE_UNUSED 0
#define DROPBEAR_MODE_CBC 1
#define DROPBEAR_MODE_CTR 2
struct Algo_Type {
const unsigned char *name; /* identifying name */
char val; /* a value for this cipher, or -1 for invalid */
const void *data; /* algorithm specific data */
char usable; /* whether we can use this algorithm */
const void *mode; /* the mode, currently only used for ciphers,
points to a 'struct dropbear_cipher_mode' */
};
typedef struct Algo_Type algo_type;
/* lists mapping ssh types of algorithms to internal values */
extern algo_type sshkex[];
extern algo_type sshhostkey[];
extern algo_type sshciphers[];
extern algo_type sshhashes[];
extern algo_type ssh_compress[];
extern algo_type ssh_nocompress[];
extern const struct dropbear_cipher dropbear_nocipher;
extern const struct dropbear_cipher_mode dropbear_mode_none;
extern const struct dropbear_hash dropbear_nohash;
extern const struct dropbear_kex kex_curve25519;
struct dropbear_cipher {
const struct ltc_cipher_descriptor *cipherdesc;
const unsigned long keysize;
const unsigned char blocksize;
};
struct dropbear_cipher_mode {
int (*start)(int cipher, const unsigned char *IV,
const unsigned char *key,
int keylen, int num_rounds, void *cipher_state);
int (*encrypt)(const unsigned char *pt, unsigned char *ct,
unsigned long len, void *cipher_state);
int (*decrypt)(const unsigned char *ct, unsigned char *pt,
unsigned long len, void *cipher_state);
};
struct dropbear_hash {
const struct ltc_hash_descriptor *hash_desc;
const unsigned long keysize;
// hashsize may be truncated from the size returned by hash_desc,
// eg sha1-96
const unsigned char hashsize;
};
enum dropbear_kex_mode {
DROPBEAR_KEX_NORMAL_DH,
DROPBEAR_KEX_ECDH,
DROPBEAR_KEX_CURVE25519,
};
struct dropbear_kex {
enum dropbear_kex_mode mode;
/* "normal" DH KEX */
const unsigned char *dh_p_bytes;
const int dh_p_len;
/* elliptic curve DH KEX */
#ifdef DROPBEAR_ECDH
const struct dropbear_ecc_curve *ecc_curve;
#else
const void* dummy;
#endif
/* both */
const struct ltc_hash_descriptor *hash_desc;
};
int have_algo(char* algo, size_t algolen, algo_type algos[]);
void buf_put_algolist(buffer * buf, algo_type localalgos[]);
enum kexguess2_used {
KEXGUESS2_LOOK,
KEXGUESS2_NO,
KEXGUESS2_YES,
};
#define KEXGUESS2_ALGO_NAME "kexguess2@matt.ucc.asn.au"
#define KEXGUESS2_ALGO_ID 99
algo_type * buf_match_algo(buffer* buf, algo_type localalgos[],
enum kexguess2_used *kexguess2, int *goodguess);
#ifdef ENABLE_USER_ALGO_LIST
int check_user_algos(const char* user_algo_list, algo_type * algos,
const char *algo_desc);
char * algolist_string(algo_type algos[]);
#endif
enum {
DROPBEAR_COMP_NONE,
DROPBEAR_COMP_ZLIB,
DROPBEAR_COMP_ZLIB_DELAY,
};
#endif /* _ALGO_H_ */
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