t = stopTimer();
uart_putstr_P(PSTR("\r\n\tencrypt time: "));
ultoa((unsigned long)t, str, 10);
uart_putstr(str);
startTimer(1);
t = stopTimer();
uart_putstr_P(PSTR("\r\n\tencrypt time: "));
ultoa((unsigned long)t, str, 10);
uart_putstr(str);
startTimer(1);