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/***************************************************************************
* *
* copyright (C) 2003, 2004 by Michael Buesch *
* email: mbuesch@freenet.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License version 2 *
* as published by the Free Software Foundation. *
* *
***************************************************************************/
/***************************************************************************
* copyright (C) 2004 by Ulf Schenk
* This file is originaly based on version 1.1 of pwmanager
* and was modified to run on embedded devices that run microkde
*
* $Id$
**************************************************************************/
#include "randomizer.h"
#include "pwmexception.h"
#include <qfile.h>
#include <kapplication.h>
#include <stdlib.h>
#include <time.h>
#ifdef PWM_EMBEDDED
#ifndef Q_LONG
#define Q_LONG long
#endif
#endif //PWM_EMBEDDED
#ifdef _WIN32_
int rand_r( uint * seed ) {
srand(*seed);
return rand();
}
#endif
Randomizer * Randomizer::rndObj (0);
Randomizer::Randomizer()
{
rndDev = new QFile;
seed = time(0);
#if 1 // set to 0 to test rand_r() fallback
// probe for /dev/urandom
rndDev->setName("/dev/urandom");
if (rndDev->exists() &&
rndDev->open(QIODevice::ReadOnly)) {
printDebug("Randomizer: using /dev/urandom");
return;
}
// probe for /dev/random
rndDev->setName("/dev/random");
if (rndDev->exists() &&
rndDev->open(QIODevice::ReadOnly)) {
printDebug("Randomizer: using /dev/random");
return;
}
// probe for EGD
char *fn = getenv("RANDFILE");
if (fn) {
rndDev->setName(fn);
if (rndDev->exists() &&
rndDev->open(QIODevice::ReadOnly)) {
printDebug(string("Randomizer: using $RANDFILE \"")
+ fn
+ "\" (aka EGD)");
return;
}
}
#endif
/* no secure randomizer found.
* Fall back to stdlib randomizer.
*/
delete_and_null(rndDev);
printWarn("neither /dev/*random nor EGD found! "
"Falling back to insecure rand_r()!");
}
Randomizer::~Randomizer()
{
#ifndef PWM_EMBEDDED
while (mutex.locked()) {
/* wait for the mutex to unlock.
* Don't block the GUI here, so processEvents()
*/
kapp->processEvents();
}
#endif
if (rndDev) {
rndDev->close();
delete rndDev;
}
}
char Randomizer::genRndChar()
{
char ret;
#ifndef PWM_EMBEDDED
mutex.lock();
#endif
if (rndDev) {
/* we have a file which provides random data.
* Simply read it.
*/
ret = rndDev->getch();
} else {
/* fall back to rand_r() */
ret = rand_r(&seed) % 0xFF;
}
#ifndef PWM_EMBEDDED
mutex->unlock();
#endif
return ret;
}
int Randomizer::genRndInt()
{
int ret;
#ifndef PWM_EMBEDDED
mutex->lock();
#endif
if (rndDev) {
if (sizeof(int) == 4) {
(reinterpret_cast<char *>(&ret))[0] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[1] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[2] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[3] = rndDev->getch();
} else if (sizeof(int) == 8) {
(reinterpret_cast<char *>(&ret))[0] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[1] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[2] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[3] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[4] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[5] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[6] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[7] = rndDev->getch();
} else {
printWarn(string(__FILE__) + ":" + tostr(__LINE__)
+ ": sizeof(int) != 4 && sizeof(int) != 8");
ret = rand_r(&seed);
}
} else {
ret = rand_r(&seed);
}
#ifndef PWM_EMBEDDED
mutex->unlock();
#endif
return ret;
}
unsigned int Randomizer::genRndUInt()
{
unsigned int ret;
#ifndef PWM_EMBEDDED
mutex->lock();
#endif
if (rndDev) {
if (sizeof(unsigned int) == 4) {
(reinterpret_cast<char *>(&ret))[0] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[1] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[2] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[3] = rndDev->getch();
} else if (sizeof(unsigned int) == 8) {
(reinterpret_cast<char *>(&ret))[0] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[1] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[2] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[3] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[4] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[5] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[6] = rndDev->getch();
(reinterpret_cast<char *>(&ret))[7] = rndDev->getch();
} else {
printWarn(string(__FILE__) + ":" + tostr(__LINE__)
+ ": sizeof(unsigned int) != 4 && sizeof(unsigned int) != 8");
ret = rand_r(&seed);
}
} else {
ret = rand_r(&seed);
}
#ifndef PWM_EMBEDDED
mutex->unlock();
#endif
return ret;
}
void Randomizer::genRndBuf(unsigned char *buf, size_t len)
{
#ifndef PWM_EMBEDDED
mutex->lock();
#endif
if (rndDev) {
Q_LONG n;
n = rndDev->readBlock(reinterpret_cast<char *>(buf), len);
WARN_ON(n != static_cast<Q_LONG>(len));
} else {
size_t i;
for (i = 0; i < len; ++i)
buf[i] = rand_r(&seed) % 0xFF;
}
#ifndef PWM_EMBEDDED
mutex->unlock();
#endif
}
string Randomizer::genRndBuf(size_t len)
{
string ret;
unsigned char *buf;
buf = new unsigned char[len];
genRndBuf(buf, len);
ret.assign(reinterpret_cast<const char *>(buf), len);
return ret;
}
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