Online PHP editor | refs for Db90F

<?php class DeterministicRandom { protected $counter; public function __construct(string $seed = '', int $counter = 0) { $this->seed('set', $seed); $this->counter = 0; } private function seed(string $action = 'get', string $data = '') { static $seed = null; if ($action === 'set') { $seed = $data; } elseif ($action === 'get') { return $data; } else { throw new \Error( 'Unknown action' ); } } public function getBytes(int $numBytes): string { return \openssl_encrypt( \str_repeat("\0", $numBytes), 'aes-128-ctr', $this->seed('get'), OPENSSL_RAW_DATA, $this->getNonce($numBytes) ); } public function getInt(int $min, int $max): int { /** * @todo */ return 0; } protected function getNonce(int $increment = 0): string { $nonce = ''; $ctr = $this->counter; while ($ctr > 0) { $nonce = \chr($ctr & 0xFF) . $nonce; $ctr >>= 8; } $this->counter += $increment; return \str_pad($nonce, 16, "\0", STR_PAD_LEFT); } } $seed = str_repeat("\x80", 16); $rnd1 = new DeterministicRandom($seed); $rnd2 = new DeterministicRandom($seed); $out1 = $rnd1->getBytes(16); $out2 = $rnd1->getBytes(16); $out3 = $rnd2->getBytes(32); var_dump([ bin2hex($out1), bin2hex($out2), bin2hex($out3) ]);