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/*
* uAnytun
*
* uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation uAnytun has no support for multiple connections
* or synchronisation. It is a small single threaded implementation intended
* to act as a client on small platforms.
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methods used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2014 Christian Pointner <equinox@anytun.org>
*
* This file is part of uAnytun.
*
* uAnytun is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* uAnytun is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with uAnytun. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#ifndef UANYTUN_cipher_h_INCLUDED
#define UANYTUN_cipher_h_INCLUDED
#ifndef NO_CRYPT
#if defined(USE_SSL_CRYPTO)
#include <openssl/aes.h>
#elif defined(USE_NETTLE)
#include <nettle/aes.h>
#else // USE_GCRYPT is the default
#include <gcrypt.h>
#endif
#include "key_derivation.h"
#else
enum key_derivation_dir_enum { kd_inbound = 0, kd_outbound = 1 };
typedef enum key_derivation_dir_enum key_derivation_dir_t;
typedef u_int8_t key_derivation_t;
#endif
enum cipher_type_enum { c_unknown, c_null, c_aes_ctr };
typedef enum cipher_type_enum cipher_type_t;
struct cipher_struct {
cipher_type_t type_;
u_int16_t key_length_;
buffer_t key_;
buffer_t salt_;
void* params_;
};
typedef struct cipher_struct cipher_t;
int cipher_init(cipher_t* c, const char* type);
void cipher_close(cipher_t* c);
int cipher_encrypt(cipher_t* c, key_derivation_t* kd, key_derivation_dir_t dir, plain_packet_t* in, encrypted_packet_t* out, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
int cipher_decrypt(cipher_t* c, key_derivation_t* kd, key_derivation_dir_t dir, encrypted_packet_t* in, plain_packet_t* out);
int32_t cipher_null_crypt(u_int8_t* in, u_int32_t ilen, u_int8_t* out, u_int32_t olen);
#ifndef NO_CRYPT
#define C_AESCTR_DEFAULT_KEY_LENGTH 128
#define C_AESCTR_CTR_LENGTH 16
#define C_AESCTR_SALT_LENGTH 14
union __attribute__((__packed__)) cipher_aesctr_ctr_union {
u_int8_t buf_[C_AESCTR_CTR_LENGTH];
struct __attribute__ ((__packed__)) {
u_int8_t buf_[C_AESCTR_SALT_LENGTH];
u_int16_t zero_;
} salt_;
struct __attribute__((__packed__)) {
u_int8_t fill_[C_AESCTR_SALT_LENGTH - sizeof(mux_t) - sizeof(sender_id_t) - 2*sizeof(u_int8_t) - sizeof(seq_nr_t)];
mux_t mux_;
sender_id_t sender_id_;
u_int8_t empty_[2];
seq_nr_t seq_nr_;
u_int16_t zero_;
} params_;
};
typedef union cipher_aesctr_ctr_union cipher_aesctr_ctr_t;
struct cipher_aesctr_param_struct {
#if defined(USE_SSL_CRYPTO)
AES_KEY aes_key_;
u_int8_t ecount_buf_[AES_BLOCK_SIZE];
#elif defined(USE_NETTLE)
struct aes_ctx ctx_;
#else // USE_GCRYPT is the default
gcry_cipher_hd_t handle_;
#endif
cipher_aesctr_ctr_t ctr_;
};
typedef struct cipher_aesctr_param_struct cipher_aesctr_param_t;
int cipher_aesctr_init(cipher_t* c);
void cipher_aesctr_close(cipher_t* c);
int cipher_aesctr_calc_ctr(cipher_t* c, key_derivation_t* kd, key_derivation_dir_t dir, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
int32_t cipher_aesctr_crypt(cipher_t* c, key_derivation_t* kd, key_derivation_dir_t dir, u_int8_t* in, u_int32_t ilen, u_int8_t* out, u_int32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
#endif
#endif
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