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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) 2007-2008 Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* Anytun 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 anytun. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _MPI_H_
#define _MPI_H_
#include "datatypes.h"
#include "buffer.h"
#include <gcrypt.h>
/**
* This class is a wrapper for the libgcrypt multi precision integer library [1]
* [1] http://www.gnupg.org/documentation/manuals/gcrypt/MPI-library.html
*
*/
class Mpi
{
public:
Mpi();
virtual ~Mpi();
Mpi(u_int8_t length);
Mpi(const Mpi &src);
Mpi(const u_int8_t * src, u_int32_t len);
void operator=(const Mpi &src);
void operator=(u_int32_t src);
Mpi operator+(const Mpi &b) const;
Mpi operator+(const u_int32_t &b) const;
Mpi operator*(const u_int32_t n) const;
Mpi operator/(const Mpi &b) const;
Mpi operator^(const Mpi &b) const;
Mpi mul2exp(u_int32_t e) const; // value * 2^e
/**
* returns a new[] u_int8_t* buffer with the MPI value in the
* GCRYMPI_FMT_STD (2-complement stored without a length header).<br>
* you have to delete it by hand with delete[]!
* @param buf_len size of the new buffer that is returned
* @return a byte buffer of size buf_len
*/
u_int8_t *getNewBuf(size_t* written) const;
std::string getHexDump() const;
u_int32_t getLength() const;
protected:
gcry_mpi_t val_;
};
#endif
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