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Diffstat (limited to 'src/algo.h')
| -rw-r--r-- | src/algo.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/src/algo.h b/src/algo.h new file mode 100644 index 0000000..c46b409 --- /dev/null +++ b/src/algo.h @@ -0,0 +1,147 @@ +/* + * 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 DROPBEAR_ALGO_H_ + +#define DROPBEAR_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 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 sigalgs[]; +extern algo_type sshciphers[]; +extern algo_type sshhashes[]; +extern algo_type ssh_compress[]; +extern algo_type ssh_delaycompress[]; +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; + +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); + int (*aead_crypt)(unsigned int seq, + const unsigned char *in, unsigned char *out, + unsigned long len, unsigned long taglen, + void *cipher_state, int direction); + int (*aead_getlength)(unsigned int seq, + const unsigned char *in, unsigned int *outlen, + unsigned long len, void *cipher_state); + const struct dropbear_hash *aead_mac; +}; + +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 { +#if DROPBEAR_NORMAL_DH + DROPBEAR_KEX_NORMAL_DH, +#endif +#if DROPBEAR_ECDH + DROPBEAR_KEX_ECDH, +#endif +#if DROPBEAR_CURVE25519 + DROPBEAR_KEX_CURVE25519, +#endif +}; + +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 */ +#if DROPBEAR_ECDH + const struct dropbear_ecc_curve *ecc_curve; +#else + const void* dummy; +#endif + + /* both */ + const struct ltc_hash_descriptor *hash_desc; +}; + +/* Includes all algorithms is useall is set */ +void buf_put_algolist_all(buffer * buf, const algo_type localalgos[], int useall); +/* Includes "usable" algorithms */ +void buf_put_algolist(buffer * buf, const algo_type localalgos[]); + +#define KEXGUESS2_ALGO_NAME "kexguess2@matt.ucc.asn.au" + +int buf_has_algo(buffer *buf, const char *algo); +algo_type * first_usable_algo(algo_type algos[]); +algo_type * buf_match_algo(buffer* buf, algo_type localalgos[], + int kexguess2, int *goodguess); + +#if DROPBEAR_USER_ALGO_LIST +int check_user_algos(const char* user_algo_list, algo_type * algos, + const char *algo_desc); +char * algolist_string(const algo_type algos[]); +#endif + +enum { + DROPBEAR_COMP_NONE, + DROPBEAR_COMP_ZLIB, + DROPBEAR_COMP_ZLIB_DELAY, +}; + +#endif /* DROPBEAR_ALGO_H_ */ |