cypher.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 _CYPHER_H_
  32 #define _CYPHER_H_
  33
  34 #include "datatypes.h"
  35 #include "buffer.h"
  36
  37
  38 class Cypher
  39 {
  40 public:
  41   Cypher() {};
  42   virtual ~Cypher() {};
  43
  44   void setKey(Buffer key) {};
  45   void setSalt(Buffer salt) {};
  46   void cypher(Buffer& buf, seq_nr_t seq_nr, sender_id_t sender_id);
  47
  48 protected:
  49   void exor(Buffer& buf, const Buffer& bit_stream);
  50   virtual Buffer getBitStream(u_int32_t length, seq_nr_t seq_nr, sender_id_t sender_id) = 0;
  51 };
  52
  53 class NullCypher : public Cypher
  54 {
  55 protected:
  56   Buffer getBitStream(u_int32_t length, seq_nr_t seq_nr, sender_id_t sender_id);
  57 };
  58
  59 class AesIcmCypher : public Cypher
  60 {
  61 public:
  62   AesIcmCypher() : key_(Buffer(0)), salt_(Buffer(14)) {};
  63   void setKey(Buffer key);
  64   void setSalt(Buffer salt);
  65 //  void cypher(Buffer& buf, seq_nr_t seq_nr, sender_id_t sender_id);
  66
  67 protected:
  68   Buffer getBitStream(u_int32_t length, seq_nr_t seq_nr, sender_id_t sender_id);
  69
  70 private:
  71   Buffer key_;
  72   Buffer salt_;   // size: 112 bit
  73 };
  74
  75 #endif