class EphemeralKeyManager {

    @Nullable
    @VisibleForTesting
    EphemeralKey getEphemeralKey() {
        return mEphemeralKey;
    }

      EphemeralKeyManager(
            @NonNull EphemeralKeyProvider ephemeralKeyProvider,
            @NonNull KeyManagerListener keyManagerListener,
            long timeBufferInSeconds,
            @Nullable Calendar overrideCalendar);

}