assertTrue(ex.getMessage().contains("signing key"));
        }

        @Test
        @DisplayName("initSecContext throws on invalid ranges")
        void testInitSecContextInvalidRanges() {
            DummySSPContext ctx = new DummySSPContext(new byte[] { 1 }, false, null, null, 0, false);
            byte[] buf = new byte[] { 1, 2, 3 };