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110 lines
3.4 KiB
110 lines
3.4 KiB
/***************************************************************************
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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 <wincrypt.h>
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#include <QSysInfo>
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#endif
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#include <QCryptographicHash>
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#include <QCursor>
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#include <QDataStream>
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#include <QDateTime>
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#include <QTime>
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void initStdRand();
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bool getNativeEntropy(quint8* buffer, int length);
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void getEntropy(quint8* buffer, int length){
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if (!getNativeEntropy(buffer, length)) {
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qWarning("Entropy collection failed, using fallback");
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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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}
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quint32 randint(quint32 limit){
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quint32 rand;
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randomize(&rand, 4);
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return (rand % limit);
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}
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quint32 randintRange(quint32 min, quint32 max){
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return min + randint(max-min+1);
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}
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#if defined(Q_WS_X11) || defined(Q_WS_MAC)
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extern bool getNativeEntropy(quint8* buffer, int length) {
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QFile dev_urandom("/dev/urandom");
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if (!dev_urandom.open(QIODevice::ReadOnly|QIODevice::Unbuffered))
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return false;
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return (dev_urandom.read((char*)buffer,length) == length);
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}
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#elif defined(Q_WS_WIN)
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extern bool getNativeEntropy(quint8* buffer, int length) {
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HCRYPTPROV handle;
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if (!CryptAcquireContext(&handle, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
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return false;
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CryptGenRandom(handle, length, buffer);
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CryptReleaseContext(handle, 0);
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return true;
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}
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#endif
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extern void 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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#ifdef Q_WS_WIN
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stream << (quint32) GetCurrentProcessId();
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#else
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stream << getpid();
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#endif
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/* On a modern OS code, stack and heap base are randomized */
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quint64 code_value = (quint64)initStdRand;
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stream << code_value;
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stream << (quint64)&code_value;
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QByteArray hash = QCryptographicHash::hash(buffer, QCryptographicHash::Sha1);
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qsrand( *((uint*) hash.data()) );
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initalized = true;
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}
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