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/***************************************************************************
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* Copyright (C) 2005 by Tarek Saidi *
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* mail@tarek-saidi.de *
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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; version 2 of the License. *
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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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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include "random.h"
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#if defined(Q_WS_X11) || defined(Q_WS_MAC)
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#include <QFile>
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#elif defined(Q_WS_WIN)
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#include <windows.h>
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#include <QSysInfo>
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#endif
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#include <QCursor>
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#include <QDateTime>
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#include <QTime>
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void Random::getEntropy(quint8* buffer, int length){
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#if defined(Q_WS_X11) || defined(Q_WS_MAC)
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QFile dev_urandom("/dev/urandom");
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if (dev_urandom.open(QIODevice::ReadOnly|QIODevice::Unbuffered) && dev_urandom.read((char*)buffer,length)==length)
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return;
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#elif defined(Q_WS_WIN)
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// RtlGenRandom
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if (QSysInfo::WindowsVersion>=QSysInfo::WV_XP){
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bool success=false;
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HMODULE hLib=LoadLibraryA("ADVAPI32.DLL");
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if (hLib) {
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BOOLEAN (APIENTRY *pfn)(void*, ULONG) = (BOOLEAN (APIENTRY *)(void*,ULONG))GetProcAddress(hLib,"SystemFunction036");
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if (pfn && pfn(buffer,length)) {
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success=true;
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}
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FreeLibrary(hLib);
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}
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if (success)
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return;
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}
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#endif
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initStdRand();
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for(int i=0;i<length;i++){
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((quint8*)buffer)[i] = (quint8) (qrand()%256);
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}
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}
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void Random::initStdRand(){
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static bool initalized = false;
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if (initalized)
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return;
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QByteArray buffer;
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QDataStream stream(&buffer, QIODevice::WriteOnly);
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stream << QCursor::pos();
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stream << QDateTime::currentDateTime().toTime_t();
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stream << QTime::currentTime().msec();
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quint8 hash[32];
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SHA256::hashBuffer(buffer.data(), hash, buffer.size());
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qsrand( (uint) *hash );
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initalized = true;
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}
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