default KeyManagerFactory getKeyManagerFactory() {
        return Unchecked.supplier(() -> {
            val factory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
            factory.init(null, null);
            return factory;
        }).get();
    }
Gets key manager factory.

@return the key manager factory
core/cas-server-core-authentication-api/src/main/java/org/apereo/cas/authentication/CasSSLContext.java