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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Security\Core\Tests\Util;
use Symfony\Component\Security\Core\Util\SecureRandom;
/**
* @group legacy
*/
class SecureRandomTest extends \PHPUnit_Framework_TestCase
{
/**
* T1: Monobit test.
*/
public function testMonobit()
{
$secureRandom = new SecureRandom();
$nbOnBits = substr_count($this->getBitSequence($secureRandom, 20000), '1');
$this->assertTrue($nbOnBits > 9654 && $nbOnBits < 10346, 'Monobit test failed, number of turned on bits: '.$nbOnBits);
}
/**
* T2: Chi-square test with 15 degrees of freedom (chi-Quadrat-Anpassungstest).
*/
public function testPoker()
{
$secureRandom = new SecureRandom();
$b = $this->getBitSequence($secureRandom, 20000);
$c = array();
for ($i = 0; $i <= 15; ++$i) {
$c[$i] = 0;
}
for ($j = 1; $j <= 5000; ++$j) {
$k = 4 * $j - 1;
++$c[8 * $b[$k - 3] + 4 * $b[$k - 2] + 2 * $b[$k - 1] + $b[$k]];
}
$f = 0;
for ($i = 0; $i <= 15; ++$i) {
$f += $c[$i] * $c[$i];
}
$Y = 16 / 5000 * $f - 5000;
$this->assertTrue($Y > 1.03 && $Y < 57.4, 'Poker test failed, Y = '.$Y);
}
/**
* Run test.
*/
public function testRun()
{
$secureRandom = new SecureRandom();
$b = $this->getBitSequence($secureRandom, 20000);
$runs = array();
for ($i = 1; $i <= 6; ++$i) {
$runs[$i] = 0;
}
$addRun = function ($run) use (&$runs) {
if ($run > 6) {
$run = 6;
}
++$runs[$run];
};
$currentRun = 0;
$lastBit = null;
for ($i = 0; $i < 20000; ++$i) {
if ($lastBit === $b[$i]) {
++$currentRun;
} else {
if ($currentRun > 0) {
$addRun($currentRun);
}
$lastBit = $b[$i];
$currentRun = 0;
}
}
if ($currentRun > 0) {
$addRun($currentRun);
}
$this->assertTrue($runs[1] > 2267 && $runs[1] < 2733, 'Runs of length 1 outside of defined interval: '.$runs[1]);
$this->assertTrue($runs[2] > 1079 && $runs[2] < 1421, 'Runs of length 2 outside of defined interval: '.$runs[2]);
$this->assertTrue($runs[3] > 502 && $runs[3] < 748, 'Runs of length 3 outside of defined interval: '.$runs[3]);
$this->assertTrue($runs[4] > 233 && $runs[4] < 402, 'Runs of length 4 outside of defined interval: '.$runs[4]);
$this->assertTrue($runs[5] > 90 && $runs[5] < 223, 'Runs of length 5 outside of defined interval: '.$runs[5]);
$this->assertTrue($runs[6] > 90 && $runs[6] < 233, 'Runs of length 6 outside of defined interval: '.$runs[6]);
}
/**
* Long-run test.
*/
public function testLongRun()
{
$secureRandom = new SecureRandom();
$b = $this->getBitSequence($secureRandom, 20000);
$longestRun = $currentRun = 0;
$lastBit = null;
for ($i = 0; $i < 20000; ++$i) {
if ($lastBit === $b[$i]) {
++$currentRun;
} else {
if ($currentRun > $longestRun) {
$longestRun = $currentRun;
}
$lastBit = $b[$i];
$currentRun = 0;
}
}
if ($currentRun > $longestRun) {
$longestRun = $currentRun;
}
$this->assertTrue($longestRun < 34, 'Failed longest run test: '.$longestRun);
}
/**
* Serial Correlation (Autokorrelationstest).
*/
public function testSerialCorrelation()
{
$secureRandom = new SecureRandom();
$shift = mt_rand(1, 5000);
$b = $this->getBitSequence($secureRandom, 20000);
$Z = 0;
for ($i = 0; $i < 5000; ++$i) {
$Z += $b[$i] === $b[$i + $shift] ? 1 : 0;
}
$this->assertTrue($Z > 2326 && $Z < 2674, 'Failed serial correlation test: '.$Z);
}
private function getBitSequence($secureRandom, $length)
{
$bitSequence = '';
for ($i = 0; $i < $length; $i += 40) {
$value = unpack('H*', $secureRandom->nextBytes(5));
$value = str_pad(base_convert($value[1], 16, 2), 40, '0', STR_PAD_LEFT);
$bitSequence .= $value;
}
return substr($bitSequence, 0, $length);
}
}
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