public CKR C_EX_SignInvisibleInit(NativeULong session, ref CK_MECHANISM mechanism, NativeULong key)
        {
            if (_disposed)
                throw new ObjectDisposedException(GetType().FullName);

            NativeULong rv = _rutokenDelegates.C_EX_SignInvisibleInit(session, ref mechanism, key);
            return (CKR)rv;
        }