Online PHP editor | rfc for Db90F

@ 2015-12-22T17:49:18Z

<?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)
]);

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught Error: Call to undefined function openssl_encrypt() in /in/Db90F:29 Stack trace: #0 /in/Db90F(64): DeterministicRandom->getBytes(16) #1 {main} thrown in /in/Db90F on line 29
Process exited with code 255.

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