shoghicp/gist:3968829

## gistfile1.txt
		protected function _shiftIV($IV, $str){ //Only for CFB
			if(strlen($str) < 16){
				$len = min($this->IVLenght, strlen($str));
				return substr($IV, $len).substr($str, -$len);
			}
			return substr($str, -$this->IVLenght);
		}
	protected function _shiftIV($IV, $str){ //Only for CFB
	if(strlen($str) < 16){
	$len = min($this->IVLenght, strlen($str));
	return substr($IV, $len).substr($str, -$len);
	}
	return substr($str, -$this->IVLenght);
	}