if ($lblok - ($i+2) >= 0) //warunek
{
    $random = 'abcdefghijklmnop';
    $xor= [];
        for ($y = 1; $y <= aes::BLOCK_SIZE; $y++)
        {
        for ($z = 1; $z < $y; $z++)
        {
            $random[aes::BLOCK_SIZE - $z] = chr($y ^ $xor[$z-1]); // zmiana wartosci
        }
        for ($j = 0; $j < 256; $j++)
        {
            $random[aes::BLOCK_SIZE - $y] = chr($j); // wyciaganie bajtow
        if (aes::padding($random . $bloki[$lblok - ($i+1)]))
        {
            $pxor = ($y ^ $j); //padding XOR
            $xor[] = $pxor;
            $litera = (ord($bloki[$lblok - ($i+2)][aes::BLOCK_SIZE - $y]) ^ $pxor);
            $deszyfr = chr($litera) . $deszyfr;
            continue;