public Optional<EncryptionPluginService> findEncryptionService(String algorithmName) {
        return Optional.ofNullable(ENCRYPTION_SPI_MAP.get(algorithmName));
    }
@Test
    void testFindEncryptionService() {
        EncryptionPluginManager instance = EncryptionPluginManager.instance();
        Optional<EncryptionPluginService> optional = instance.findEncryptionService("aes");
        assertTrue(optional.isPresent());
    }