SignatureAndHashAlgorithmsExtensionPreparator extends
        ExtensionPreparator<SignatureAndHashAlgorithmsExtensionMessage> { @Override public void prepareExtensionContent() { LOGGER.debug("Preparing SignatureAndHashAlgorithmsExtensionMessage"); prepareSignatureAndHashAlgorithms(msg); prepareSignatureAndHashAlgorithmsLength(msg); } SignatureAndHashAlgorithmsExtensionPreparator(Chooser chooser,
            SignatureAndHashAlgorithmsExtensionMessage message, SignatureAndHashAlgorithmsExtensionSerializer serializer); @Override void prepareExtensionContent();  }
@Test public void testPrepareExtensionContent() { }