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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 methodes 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 anytun.org <satp@wirdorange.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program 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 this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _KEYDERIVATION_H_
#define _KEYDERIVATION_H_
#include "datatypes.h"
#include "buffer.h"
#include "threadUtils.hpp"
#include "syncBuffer.h"
#include <gcrypt.h>
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/text_iarchive.hpp>
typedef enum {
LABEL_SATP_ENCRYPTION = 0x00,
LABEL_SATP_MSG_AUTH = 0x01,
LABEL_SATP_SALT = 0x02,
} satp_prf_label;
class KeyDerivation
{
public:
KeyDerivation() : ld_kdr_(0), master_salt_(0), master_key_(0) {};
virtual ~KeyDerivation() {};
void setLogKDRate(const u_int8_t ld_rate);
virtual void init(Buffer key, Buffer salt) = 0;
virtual void generate(satp_prf_label label, seq_nr_t seq_nr, Buffer& key) = 0;
virtual std::string printType() { return "KeyDerivation"; };
protected:
virtual void updateMasterKey() = 0;
KeyDerivation(const KeyDerivation & src);
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
Lock lock(mutex_);
ar & ld_kdr_;
ar & master_salt_;
ar & master_key_;
updateMasterKey();
}
int8_t ld_kdr_; // ld(key_derivation_rate)
SyncBuffer master_salt_;
SyncBuffer master_key_;
Mutex mutex_;
};
BOOST_IS_ABSTRACT(KeyDerivation)
//****** NullKeyDerivation ******
class NullKeyDerivation : public KeyDerivation
{
public:
NullKeyDerivation() {};
~NullKeyDerivation() {};
void init(Buffer key, Buffer salt) {};
void generate(satp_prf_label label, seq_nr_t seq_nr, Buffer& key);
std::string printType() { return "NullKeyDerivation"; };
private:
void updateMasterKey() {};
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & boost::serialization::base_object<KeyDerivation>(*this);
}
};
//****** AesIcmKeyDerivation ******
class AesIcmKeyDerivation : public KeyDerivation
{
public:
AesIcmKeyDerivation() : cipher_(NULL) {};
~AesIcmKeyDerivation();
void init(Buffer key, Buffer salt);
void generate(satp_prf_label label, seq_nr_t seq_nr, Buffer& key);
std::string printType() { return "AesIcmKeyDerivation"; };
private:
void updateMasterKey();
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & boost::serialization::base_object<KeyDerivation>(*this);
}
gcry_cipher_hd_t cipher_;
};
#endif
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