keyDerivation.h

   1 /*
   2  *  anytun
   3  *
   4  *  The secure anycast tunneling protocol (satp) defines a protocol used
   5  *  for communication between any combination of unicast and anycast
   6  *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
   7  *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
   8  *  ethernet, ip, arp ...). satp directly includes cryptography and
   9  *  message authentication based on the methodes used by SRTP.  It is
  10  *  intended to deliver a generic, scaleable and secure solution for
  11  *  tunneling and relaying of packets of any protocol.
  12  *
  13  *
  14  *  Copyright (C) 2007 anytun.org <satp@wirdorange.org>
  15  *
  16  *  This program is free software; you can redistribute it and/or modify
  17  *  it under the terms of the GNU General Public License version 2
  18  *  as published by the Free Software Foundation.
  19  *
  20  *  This program is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *  GNU General Public License for more details.
  24  *
  25  *  You should have received a copy of the GNU General Public License
  26  *  along with this program (see the file COPYING included with this
  27  *  distribution); if not, write to the Free Software Foundation, Inc.,
  28  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  29  */
  30
  31 #ifndef _KEYDERIVATION_H_
  32 #define _KEYDERIVATION_H_
  33
  34 #include "datatypes.h"
  35 #include "buffer.h"
  36 #include "threadUtils.hpp"
  37 #include "syncBuffer.h"
  38
  39 #include <gcrypt.h>
  40 #include <boost/archive/text_oarchive.hpp>
  41 #include <boost/archive/text_iarchive.hpp>
  42
  43
  44 typedef enum {
  45   LABEL_SATP_ENCRYPTION  = 0x00,
  46   LABEL_SATP_MSG_AUTH    = 0x01,
  47   LABEL_SATP_SALT        = 0x02,
  48 } satp_prf_label;
  49
  50
  51 class KeyDerivation
  52 {
  53 public:
  54   KeyDerivation() : ld_kdr_(-1), salt_(0), cipher_(NULL) {};
  55   virtual ~KeyDerivation();
  56
  57   void init(Buffer key, Buffer salt);
  58   void setLogKDRate(const u_int8_t ld_rate);
  59   void generate(satp_prf_label label, seq_nr_t seq_nr, Buffer& key, u_int32_t length);
  60
  61 private:
  62   void updateKey();
  63
  64         KeyDerivation(const KeyDerivation & src);
  65         friend class boost::serialization::access;
  66         template<class Archive>
  67         void serialize(Archive & ar, const unsigned int version)
  68         {
  69                 Lock lock(mutex_);
  70           ar & ld_kdr_;
  71           ar & salt_;
  72     ar & key_;
  73     updateKey();
  74         }
  75
  76 protected:
  77   int8_t ld_kdr_;     // ld(key_derivation_rate)
  78   SyncBuffer salt_;
  79   SyncBuffer key_;
  80
  81   gcry_cipher_hd_t cipher_;
  82   Mutex mutex_;
  83 };
  84
  85
  86 #endif
  87