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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
+