public static String createGcpKmsKeyUri(
      String projectId, String location, String ringId, String keyId) {
    return String.format(
        "projects/%s/locations/%s/keyRings/%s/cryptoKeys/%s", projectId, location, ringId, keyId);
  }
@return a KMS key URI in a format defined by Google Cloud KMS.
java_src/src/main/java/com/google/crypto/tink/testing/TestUtil.java