@Override
  public KeyData newKeyData(ByteString serializedKeyFormat) throws GeneralSecurityException {
    throw new UnsupportedOperationException("not needed for tests");
  }
A KeyManager for HybridDecrypt with a custom type URL for testing.
java_src/src/main/java/com/google/crypto/tink/hybrid/internal/testing/LegacyHybridDecryptKeyManager.java