@Override
    public JcePrimitiveT getInstance(String algorithm) throws GeneralSecurityException {
      return this.jceFactory.getInstance(algorithm, null);
    }
The default policy, which uses the JDK priority for providers. If a list of preferred providers
is provided, then these will be used first in the order they are given.
java_src/src/main/java/com/google/crypto/tink/subtle/EngineFactory.java