anytun: keyDerivation.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 _KEYDERIVATION_H_
-00032 #define _KEYDERIVATION_H_
-00033 
-00034 #include "datatypes.h"
-00035 #include "buffer.h"
-00036 
-00037 
-00038 extern "C" {
-00039   #include <gcrypt.h>
-00040 }
-00041 
-00042 
-00043 typedef enum {
-00044   label_satp_encryption  = 0x00,
-00045   label_satp_msg_auth    = 0x01,
-00046   label_satp_salt        = 0x02,
-00047 } satp_prf_label;
-00048 
-00049 class KeyDerivation
-00050 {
-00051 public:
-00052   KeyDerivation() : ld_kdr_(-1), cipher_(NULL) {};
-00053   virtual ~KeyDerivation() {};
-00054 
-00055   void init(Buffer key, Buffer salt);
-00056   void setLogKDRate(const u_int8_t ld_rate);
-00057   void generate(satp_prf_label label, seq_nr_t seq_nr, Buffer& key, u_int32_t length);
-00058   void clear();
-00059 
-00060 
-00061 protected:
-00062   int8_t ld_kdr_;     // ld(key_derivation_rate)
-00063   Buffer salt_;
-00064   static const char* MIN_GCRYPT_VERSION;
-00065 
-00066   gcry_cipher_hd_t cipher_;
-00067 };
-00068 
-00069 
-00070 #endif
-00071 
-