anytun: cypher.h Source File

00001 /*
-00002  *  anytun
-00003  *
-00004  *  The secure anycast tunneling protocol (satp) defines a protocol used
-00005  *  for communication between any combination of unicast and anycast
-00006  *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
-00007  *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
-00008  *  ethernet, ip, arp ...). satp directly includes cryptography and
-00009  *  message authentication based on the methodes used by SRTP.  It is
-00010  *  intended to deliver a generic, scaleable and secure solution for
-00011  *  tunneling and relaying of packets of any protocol.
-00012  *
-00013  *
-00014  *  Copyright (C) 2007 anytun.org <satp@wirdorange.org>
-00015  *
-00016  *  This program is free software; you can redistribute it and/or modify
-00017  *  it under the terms of the GNU General Public License version 2
-00018  *  as published by the Free Software Foundation.
-00019  *
-00020  *  This program is distributed in the hope that it will be useful,
-00021  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
-00022  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-00023  *  GNU General Public License for more details.
-00024  *
-00025  *  You should have received a copy of the GNU General Public License
-00026  *  along with this program (see the file COPYING included with this
-00027  *  distribution); if not, write to the Free Software Foundation, Inc.,
-00028  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-00029  */
-00030 
-00031 #ifndef _CYPHER_H_
-00032 #define _CYPHER_H_
-00033 
-00034 
-00035 
-00036 #include "datatypes.h"
-00037 #include "buffer.h"
-00038 
-00039 extern "C" {
-00040 #include <gcrypt.h>
-00041 }
-00042 
-00043 
-00044 class Cypher
-00045 {
-00046 public:
-00047   Cypher() {};
-00048   virtual ~Cypher() {};
-00049  
-00050   void setKey(Buffer key) {};
-00051   void setSalt(Buffer salt) {};
-00052   void cypher(Buffer& buf, seq_nr_t seq_nr, sender_id_t sender_id);
-00053   
-00054 protected:
-00055   void exor(Buffer& buf, const Buffer& bit_stream);
-00056   virtual Buffer getBitStream(u_int32_t length, seq_nr_t seq_nr, sender_id_t sender_id) = 0;
-00057 };
-00058 
-00059 class NullCypher : public Cypher
-00060 {
-00061 protected:
-00062   Buffer getBitStream(u_int32_t length, seq_nr_t seq_nr, sender_id_t sender_id);
-00063 };
-00064 
-00065 class AesIcmCypher : public Cypher
-00066 {
-00067 public:
-00068   AesIcmCypher();
-00069   ~AesIcmCypher();
-00070   void setKey(Buffer key);
-00071   void setSalt(Buffer salt);
-00072 
-00073   static const char* MIN_GCRYPT_VERSION;
-00074   static const u_int32_t GCRYPT_SEC_MEM = 16384;    // 16k secure memory
-00075 
-00076 protected:
-00077   Buffer getBitStream(u_int32_t length, seq_nr_t seq_nr, sender_id_t sender_id);
-00078   gcry_cipher_hd_t cipher_;
-00079   Buffer salt_;
-00080 
-00081 private:
-00082   static bool gcrypt_initialized_;
-00083 };
-00084 
-00085 
-00086 #endif
-