public boolean verifyTimeoutCode(long currentInterval, String timeoutCode)
      throws GeneralSecurityException {
    return verifyTimeoutCode(timeoutCode, currentInterval,
                             ADJACENT_INTERVALS, ADJACENT_INTERVALS);
  }
Verify a timeout code. The timeout code will be valid for a time
determined by the interval period and the number of adjacent intervals
checked.

@param timeoutCode The timeout code
@return True if the timeout code is valid
java/com/google/android/apps/authenticator/otp/PasscodeGenerator.java