assertEquals(16, signingKey.length, "Should still produce 16-byte key");
    }

    @Test
    @DisplayName("Should handle null preauth integrity for SMB 3.0.0")
    void testDeriveKeys_NullPreauthForSMB300() {
        // Given
        int dialect = Smb2Constants.SMB2_DIALECT_0300;

        // When - SMB 3.0.0 doesn't use preauth integrity, so null should be acceptable