ms_usage = 8;
        case 23:
            ms_usage = 13;
        }
        return ms_usage;
    }

    /**
     * Calculates a MAC using HMAC-SHA1 with AES key derivation.
     * This method supports both AES-128 and AES-256 encryption types.
     *
     * @param usage the Kerberos key usage number for this operation
     * @param baseKey the base Kerberos key for key derivation

    public static final int NEGO_CTX_ENC_TYPE = 0x2;

    /**
     * AES 128 CCM
     */
    public static final int CIPHER_AES128_CCM = 0x1;

    /**
     * AES 128 GCM
     */
    public static final int CIPHER_AES128_GCM = 0x2;

    /**
     * AES 256 CCM
     */
    public static final int CIPHER_AES256_CCM = 0x3;

    /**
     * AES 256 GCM
     */
    public static final int CIPHER_AES256_GCM = 0x4;

    }

    @Test
    @DisplayName("Should handle AES encryption operations")
    void testAESOperations() throws Exception {
        // Given
        byte[] key = new byte[16]; // 128-bit key
        byte[] iv = new byte[16]; // 128-bit IV
        byte[] plaintext = "This is test data for AES encryption test".getBytes();

        new SecureRandom().nextBytes(key);

- Configurable: Min/max versions can be set via configuration properties

### SMB3 Encryption Support
- **SMB2 Transform Header**: Encrypted message wrapping
- **AES-CCM/GCM Support**: Both AES-128-CCM (SMB 3.0/3.0.2) and AES-128-GCM (SMB 3.1.1) cipher suites
- **Encryption Context**: Per-session encryption state management
- **Key Derivation**: SMB3 KDF implementation with dialect-specific parameters

                return "AES";
            }

            @Override
            public String getAppCipherKey() {
                return "1234567890123456"; // 16 bytes for AES
            }
        });

        // Create test cipher - use proper constructor with simple implementation
        InvertibleCryptographer cookieCipher = new InvertibleCryptographer("AES", "1234567890123456", null) {
            @Override

 * supporting various checksum algorithms including HMAC-MD5 and HMAC-SHA1 with AES.
 */
public class PacSignature {

    /**
     * Kerberos checksum type for HMAC-MD5 (ARCFOUR-HMAC).
     */
    public static final int KERB_CHECKSUM_HMAC_MD5 = 0xFFFFFF76;
    /**
     * Kerberos checksum type for HMAC-SHA1-96 with AES-128.
     */
    public static final int HMAC_SHA1_96_AES128 = 0x0000000F;
    /**

@DisplayName("CIFSUnsupportedCryptoException Tests")
class CIFSUnsupportedCryptoExceptionTest extends BaseTest {

    private static final String CRYPTO_ERROR_MESSAGE = "Unsupported cryptographic algorithm: AES-256-GCM";
    private static final String ALGORITHM_NAME = "AES-256-GCM";

    @Test
    @DisplayName("Default constructor should create exception with null message and cause")
    void testDefaultConstructor() {
        // Given & When

            this.preauthSalt = salt;

            if (config.isEncryptionEnabled()) {
                // Build cipher list based on AES-256 support
                List<Integer> ciphers = new ArrayList<>();

                // Prefer GCM over CCM for better performance
                if (config.isAES256Enabled()) {

    }

    @Test
    @DisplayName("Test log encryption")
    void testLogEncryption() {
        logger.logEncryption(true, "AES-128-GCM", "SMB3.1.1");

        Map<EventType, Long> stats = logger.getStatistics();
        assertEquals(Long.valueOf(1), stats.get(EventType.ENCRYPTION_ENABLED), "Should have 1 encryption event");
    }

    @Test