static Parameters aesGcm128Parameters() throws GeneralSecurityException {
      StringValue format = StringValue.of(AEAD_AES_128_GCM);
      KeyTemplate template =
          KeyTemplate.newBuilder()
              .setValue(format.toByteString())
              .setTypeUrl(TYPE_URL)
              .setOutputPrefixType(OutputPrefixType.RAW)
              .build();
      return TinkProtoParametersFormat.parse(template.toByteArray());
    }
A custom implementation of {@link com.google.crypto.tink.KeyManager} for AES GCM 128.

<p>It only implements the methods of the KeyManager interface that are needed.
java_src/src/test/java/com/google/crypto/tink/custom/CustomAeadKeyManagerTest.java