* This class provides methods for computing MACs using various Kerberos encryption types including
 * ARCFOUR-HMAC-MD5 and AES-based HMAC algorithms.
 */
public class PacMac {

    /**
     * Private constructor to prevent instantiation of utility class.
     */
    private PacMac() {
        // Utility class
    }

    /**
     *
     */
    private static final String HMAC_KEY = "HMAC";

        byte[] mac3 = PacMac.calculateMacArcfourHMACMD5(23, key, TEST_DATA);
        assertNotNull(mac3);
        assertEquals(16, mac3.length);

        // Test with a standard usage
        byte[] mac4 = PacMac.calculateMacArcfourHMACMD5(15, key, TEST_DATA);
        assertNotNull(mac4);
        assertEquals(16, mac4.length);
    }

    /**
     * Test method for

        // Test with mocked PacMac to avoid complex signature calculation
        try (MockedStatic<PacMac> pacMacMock = mockStatic(PacMac.class)) {
            // Mock the calculateMac method to return a valid checksum
            byte[] mockChecksum = new byte[16];
            pacMacMock.when(() -> PacMac.calculateMac(anyInt(), any(), any())).thenReturn(mockChecksum);

                    this.serverSignature.getType(), Hexdump.toHexString(this.serverSignature.getChecksum())));
        }

        byte checksum[] = PacMac.calculateMac(this.serverSignature.getType(), keys, checksumData);
        if (!MessageDigest.isEqual(this.serverSignature.getChecksum(), checksum)) {
            if (log.isDebugEnabled()) {

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