class Encryption {
private $replacement = 'urskydMeIV';
private $prefix = "8";
private $match = "111111";
private $replaceenc;
private $replacedec;
function __construct() {
for($i =0; $i < 10; $i++) {
$this->replaceenc['/'.$i.'/'] = $this->replacement{$i};
$this->replacedec['/'.$this->replacement{$i}.'/'] = $i;
}
}
public function encrypt($str) {
return preg_replace(
array_keys($this->replaceenc),
$this->replaceenc,
$this->mynotin(preg_replace("/(.)(.)/", "${2}${1}", $str))
);
}
public function decrypt($str) {
return preg_replace("/(.)(.)/", "${2}${1}",
$this->mynotout(preg_replace(array_keys($this->replacedec),$this->replacedec,$str))
);
}
private function mynotin($str) {
$str_out = "";
$i = 0;
while(isset($str{7*$i})) {
$str_out .= (($this->prefix.substr($str, $i*7, 7))+0)^$this->match;
$i++;
}
return $str_out;
}
private function mynotout($str) {
$str_out = "";
$i = 0;
while(isset($str{8*$i})) {
$str_out .= substr((substr($str, $i*8, 8)+0)^$this->match, 1);
$i++;
}
return $str_out;
}
}
?>
