// Using a key with a known value for reproducibility
        SecretKeySpec key = new SecretKeySpec(new byte[16], "ARCFOUR");
        byte[] mac = PacMac.calculateMacArcfourHMACMD5(3, key, TEST_DATA);
        assertNotNull(mac);
        assertEquals(16, mac.length);

        // Test with a different key usage
        byte[] mac2 = PacMac.calculateMacArcfourHMACMD5(9, key, TEST_DATA);
        assertNotNull(mac2);

    /**
     * Retrieves the MAC address of the remote network interface. Samba returns all zeros.
     *
     * @param tc
     *            context to use
     *
     * @return the MAC address as an array of six bytes
     * @throws UnknownHostException
     *             if the host cannot be resolved to
     *             determine the MAC address.
     */

     * signing/verifying SMB using kerberos session key.
     * The MAC Key = concat(Session Key, Digest of Challenge);
     * Because of Kerberos Authentication don't have challenge,
     * The MAC Key = Session Key
     *
     * @param macSigningKey
     *            The MAC key used to sign or verify SMB.
     */
    public SMB1SigningDigest(final byte[] macSigningKey) {

        "darwin"  | "x64"     | VENDOR_OPENJDK      | OPENJDK_VERSION_OLD  | "Contents/Home/bin/java" | "(old version)"
        "mac"     | "x64"     | VENDOR_OPENJDK      | OPEN_JDK_VERSION     | "Contents/Home/bin/java" | ""
        "mac"     | "x64"     | VENDOR_OPENJDK      | OPENJDK_VERSION_OLD  | "Contents/Home/bin/java" | "(old version)"

	return plaintext, err
}

// MAC generates the checksum of the given req.Message using the key
// with the req.Name at the KMS.
func (k *KMS) MAC(ctx context.Context, req *MACRequest) ([]byte, error) {
	if req.Name == "" {
		req.Name = k.DefaultKey
	}

	start := time.Now()
	mac, err := k.conn.MAC(ctx, req)
	k.updateMetrics(err, time.Since(start))

	return mac, err
}

	if err != nil {
		return nil, ErrDecrypt
	}
	return plaintext, nil
}

// MAC generate hmac for the request
func (s secretKey) MAC(_ context.Context, req *MACRequest) ([]byte, error) {
	mac := hmac.New(sha256.New, s.key)
	mac.Write(req.Message)
	return mac.Sum(make([]byte, 0, mac.Size())), nil
}

// parseCiphertext parses and converts a ciphertext into
// the format expected by a secretKey.

    /**
     * <code>line.separator</code> system property. For example, on Mac OS X: <code>"\n"</code>
     */
    public static final String LINE_SEPARATOR = System.getProperty("line.separator");

    /**
     * <code>path.separator</code> system property. For example, on Mac OS X: <code>":"</code>
     */
    public static final String PATH_SEPARATOR = System.getProperty("path.separator");

 * <p>
 * This service provides a platform-independent way to:
 * <ul>
 * <li>Query basic OS information like name, architecture, and version</li>
 * <li>Determine the OS family (e.g., Windows, Unix, Mac)</li>
 * <li>Check if the current OS is Windows-based</li>
 * </ul>
 * <p>
 * The service implementation uses system properties to detect OS characteristics:
 * <ul>
 * <li>os.name: The operating system name</li>

.project
.classpath
.settings/
.svn/
.jbang/

# Intellij
*.ipr
*.iml
.idea
!.idea/icon.png
/bootstrap
/dependencies.xml
.java-version
.checkstyle
.factorypath

# VSCode
.vscode/

# Mac

    }

    @Test
    public void testCapitalOsName() {
        Profile profile = newProfile(ActivationOS.newBuilder()
                .family("Mac")
                .name("Mac OS X")
                .arch("aarch64")
                .version("14.5"));

        assertActivation(false, profile, newContext(null, newProperties("linux", "6.5.0-1014-aws", "amd64")));