@Test
public void testEncrytDecrypt() throws Exception {

  KeysetHandle keysetHandle = KeysetHandle.generateNew(DeterministicAeadKeyTemplates.AES256_SIV);
  DeterministicAead aead = DeterministicAeadFactory.getPrimitive(keysetHandle);
  byte[] plaintext = Random.randBytes(20);
  byte[] associatedData = Random.randBytes(20);
  byte[] ciphertext = aead.encryptDeterministically(plaintext, associatedData);
  byte[] ciphertext2 = aead.encryptDeterministically(plaintext, associatedData);
  byte[] decrypted = aead.decryptDeterministically(ciphertext, associatedData);
  byte[] decrypted2 = aead.decryptDeterministically(ciphertext2, associatedData);
  assertArrayEquals(ciphertext, ciphertext2);
  assertArrayEquals(plaintext, decrypted);
  assertArrayEquals(plaintext, decrypted2);
}