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101 lines
2.7 KiB
101 lines
2.7 KiB
/***************************************************************************
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* Copyright (C) 2005 by Joris Guisson *
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* joris.guisson@gmail.com *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
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***************************************************************************/
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#include <time.h>
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#include <string.h>
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#include <stdlib.h>
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#include <util/log.h>
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#include <util/functions.h>
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#include <torrent/globals.h>
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#include "bigint.h"
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using namespace bt;
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namespace mse
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{
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BigInt::BigInt(Uint32 num_bits)
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{
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mpz_init2(val,num_bits);
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}
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BigInt::BigInt(const TQString & value)
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{
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mpz_init2(val,(value.length() - 2)*4);
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mpz_set_str(val,value.ascii(),0);
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}
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BigInt::BigInt(const BigInt & bi)
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{
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mpz_set(val,bi.val);
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}
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BigInt::~BigInt()
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{
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mpz_clear(val);
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}
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BigInt & BigInt::operator = (const BigInt & bi)
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{
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mpz_set(val,bi.val);
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return *this;
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}
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BigInt BigInt::powerMod(const BigInt & x,const BigInt & e,const BigInt & d)
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{
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BigInt r;
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mpz_powm(r.val,x.val,e.val,d.val);
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return r;
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}
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BigInt BigInt::random()
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{
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static Uint32 rnd = 0;
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if (rnd % 10 == 0)
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{
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TimeStamp now = bt::GetCurrentTime();
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srand(now);
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rnd = 0;
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}
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rnd++;
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Uint8 tmp[20];
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for (Uint32 i = 0;i < 20;i++)
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tmp[i] = (Uint8)rand() % 0x100;
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return BigInt::fromBuffer(tmp,20);
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}
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Uint32 BigInt::toBuffer(Uint8* buf,Uint32 max_size) const
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{
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size_t foo;
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mpz_export(buf,&foo,1,1,1,0,val);
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return foo;
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}
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BigInt BigInt::fromBuffer(const Uint8* buf,Uint32 size)
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{
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BigInt r(size*8);
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mpz_import(r.val,size,1,1,1,0,buf);
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return r;
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}
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}
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