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/*
* anytun
*
* 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) 2007-2009 Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun 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.
*
* Anytun 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 anytun. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef ANYTUN_cipher_h_INCLUDED
#define ANYTUN_cipher_h_INCLUDED
#include "datatypes.h"
#include "buffer.h"
#include "encryptedPacket.h"
#include "plainPacket.h"
#include "keyDerivation.h"
#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
#endif
class Cipher
{
public:
Cipher() : dir_(KD_INBOUND) {};
Cipher(kd_dir_t d) : dir_(d) {};
virtual ~Cipher() {};
void encrypt(KeyDerivation& kd, PlainPacket& in, EncryptedPacket& out, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
void decrypt(KeyDerivation& kd, EncryptedPacket& in, PlainPacket& out);
protected:
virtual uint32_t cipher(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux) = 0;
virtual uint32_t decipher(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux) = 0;
kd_dir_t dir_;
};
//****** NullCipher ******
class NullCipher : public Cipher
{
protected:
uint32_t cipher(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
uint32_t decipher(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
};
#ifndef NO_CRYPT
//****** AesIcmCipher ******
class AesIcmCipher : public Cipher
{
public:
AesIcmCipher(kd_dir_t d);
AesIcmCipher(kd_dir_t d, uint16_t key_length);
~AesIcmCipher();
static const uint16_t DEFAULT_KEY_LENGTH = 128;
static const uint16_t CTR_LENGTH = 16;
static const uint16_t SALT_LENGTH = 14;
protected:
uint32_t cipher(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
uint32_t decipher(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
private:
void init(uint16_t key_length = DEFAULT_KEY_LENGTH);
void calcCtr(KeyDerivation& kd, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
void calc(KeyDerivation& kd, uint8_t* in, uint32_t ilen, uint8_t* out, uint32_t olen, seq_nr_t seq_nr, sender_id_t sender_id, mux_t mux);
#if defined(USE_SSL_CRYPTO)
AES_KEY aes_key_;
uint8_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
Buffer key_;
Buffer salt_;
#ifdef _MSC_VER
#pragma pack(push, 1)
#endif
union ATTR_PACKED cipher_aesctr_ctr_union {
uint8_t buf_[CTR_LENGTH];
struct ATTR_PACKED {
uint8_t buf_[SALT_LENGTH];
uint16_t zero_;
} salt_;
struct ATTR_PACKED {
uint8_t fill_[SALT_LENGTH - sizeof(mux_t) - sizeof(sender_id_t) - 2*sizeof(uint8_t) - sizeof(seq_nr_t)];
mux_t mux_;
sender_id_t sender_id_;
uint8_t empty_[2];
seq_nr_t seq_nr_;
uint16_t zero_;
} params_;
} ctr_;
#ifdef _MSC_VER
#pragma pack(pop)
#endif
};
#endif
#endif
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