* This method registers the default resolvers.
*/
public static void registerDefaultResolvers() {
List<KeyResolver> keyResolverList = new ArrayList<KeyResolver>();
keyResolverList.add(new KeyResolver(new RSAKeyValueResolver()));
keyResolverList.add(new KeyResolver(new DSAKeyValueResolver()));
keyResolverList.add(new KeyResolver(new X509CertificateResolver()));
keyResolverList.add(new KeyResolver(new X509SKIResolver()));
keyResolverList.add(new KeyResolver(new RetrievalMethodResolver()));
keyResolverList.add(new KeyResolver(new X509SubjectNameResolver()));