assertNotNull(digest);
    }

    @Test
    @DisplayName("Test constructor with MAC signing key only (Kerberos mode)")
    void testConstructorKerberosMode() {
        SMB1SigningDigest digest = new SMB1SigningDigest(testMacSigningKey);
        assertNotNull(digest);
    }

    @Test
    @DisplayName("Test constructor with MAC signing key and initial sequence")