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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* [email protected] *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program 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 this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#ifndef MSEBIGINT_H
#define MSEBIGINT_H
#include <qstring.h>
#include <util/constants.h>
#include <stdio.h>
#include <gmp.h>
using bt::Uint8;
using bt::Uint16;
using bt::Uint32;
using bt::Uint64;
namespace mse
{
/**
* @author Joris Guisson <[email protected]>
*
* Class which can hold an arbitrary large integer. This will be a very important part of our
* MSE implementation.
*/
class BigInt
{
public:
/**
* Create a big integer, with num_bits bits.
* All bits will be set to 0.
* @param num_bits The number of bits
*/
BigInt(Uint32 num_bits = 0);
/**
* Create a big integer of a string. The string must be
* a hexadecimal representation of an integer. For example :
* 12AFFE123488BBBE123
*
* Letters can be upper or lower case. Invalid chars will create an invalid number.
* @param value The hexadecimal representation of the number
*/
BigInt(const QString & value);
/**
* Copy constructor.
* @param bi BigInt to copy
*/
BigInt(const BigInt & bi);
virtual ~BigInt();
/**
* Assignment operator.
* @param bi The BigInt to copy
* @return *this
*/
BigInt & operator = (const BigInt & bi);
/**
* Calculates
* (x ^ e) mod d
* ^ is power
*/
static BigInt powerMod(const BigInt & x,const BigInt & e,const BigInt & d);
/// Make a random BigInt
static BigInt random();
/// Export the bigint ot a buffer
Uint32 toBuffer(Uint8* buf,Uint32 max_size) const;
/// Make a BigInt out of a buffer
static BigInt fromBuffer(const Uint8* buf,Uint32 size);
private:
mpz_t val;
};
}
#endif
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