AuthenticationBuilder authBuilder = new AuthenticationBuilder();
            authBuilder.addUsername(auth.getUsername()).addPassword(auth.getPassword());
            authBuilder.addPrivateKey(auth.getPrivateKey(), auth.getPassphrase());
            result = authBuilder.build();
        }
        return result;
    }

    private static Proxy toProxy(org.apache.maven.repository.Proxy proxy) {
        Proxy result = null;