@Test
public void testConstructorWith128BitCiphers() throws Exception {

  RegistryEciesAeadHkdfDemHelper helper;
  // Supported templates.
  helper = new RegistryEciesAeadHkdfDemHelper(AeadKeyTemplates.AES128_GCM);
  assertEquals(16, helper.getSymmetricKeySizeInBytes());
  helper = new RegistryEciesAeadHkdfDemHelper(AeadKeyTemplates.AES128_CTR_HMAC_SHA256);
  assertEquals(48, helper.getSymmetricKeySizeInBytes());
}