private static function createRoundKey($expandedKey,$roundKeyPointer){
		$roundKey = array();
		for ($i = 0; $i < 4; $i++)
			for ($j = 0; $j < 4; $j++)
				$roundKey[$j*4+$i] = $expandedKey[$roundKeyPointer + $i*4 + $j];
		return $roundKey;
	}