[PHP] RSA-make key

<?php

$p = 17; //praštevilo 1
$q = 11; //praštevilo 2
$javni = 7; //javni kjuc

$n = $p * $q; //modul
$o = ($p-1)*($q-1); //koeficient

$x = 0;
$y = 1;
$lastx = 1;
$lasty = 0;
$a = $o;
$b = $javni;

while($b !=0)
{
    $quotient = intval($a / $b);
    $temp = $a;
    $a = $b;
    $b = bcmod($temp,$b);
    $temp = $x;
    $x = ($lastx - $quotient * $x);
    $lastx = $temp;
    $temp = $y;
    $y = ($lasty - $quotient * $y);
    $lasty = $temp;
}

if($lasty <0)
{
    $lasty = $o - $lasty;
}
echo 'N (modul) je '.$n.'<br>Zasebni kjuc je '.$lasty.'<br>Javni kjuc je '.$javni;
?>