HashRNGProvider.php
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HashRNGProvider.php
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	<?php

	namespace RobThree\Auth\Providers\Rng;

	class HashRNGProvider implements IRNGProvider
	{
	/** @var string */
	private $algorithm;

	/**
	* @param string $algorithm
	*/
	public function __construct($algorithm = 'sha256')
	{
	$algos = array_values(hash_algos());
	if (!in_array($algorithm, $algos, true)) {
	throw new RNGException('Unsupported algorithm specified');
	}
	$this->algorithm = $algorithm;
	}

	/**
	* {@inheritdoc}
	*/
	public function getRandomBytes($bytecount)
	{
	$result = '';
	$hash = mt_rand();
	for ($i = 0; $i < $bytecount; $i++) {
	$hash = hash($this->algorithm, $hash . mt_rand(), true);
	$result .= $hash[mt_rand(0, strlen($hash) - 1)];
	}
	return $result;
	}

	/**
	* {@inheritdoc}
	*/
	public function isCryptographicallySecure()
	{
	return false;
	}
	}