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robthree
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twofactorauth
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lib
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Providers
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Rng
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File: HashRNGProvider.php
<?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; } }