// Then
        assertNotNull(signingKey, "Signing key should not be null");
        assertEquals(16, signingKey.length, "Signing key should be 16 bytes");
        assertFalse(Arrays.equals(sessionKey, signingKey), "Signing key should be different from session key");
    }

    @Test
    @DisplayName("Should derive signing key for SMB 3.1.1 dialect")
    void testDeriveSigningKey_SMB311() {
        // Given

    /**
     * Checks whether the server has SMB message signing enabled.
     *
     * @return whether the server has signing enabled
     */
    boolean isSigningEnabled();

    /**
     * Checks whether the server requires SMB message signing.
     *
     * @return whether the server requires signing
     */
    boolean isSigningRequired();

    /**

     */
    int encode(byte[] dst, int dstIndex);

    /**
     * Sets the signing digest for this message.
     *
     * @param digest the signing digest to set
     */
    void setDigest(SMBSigningDigest digest);

    /**
     * Gets the signing digest for this message.
     *
     * @return the signing digest
     */
    SMBSigningDigest getDigest();

    /**

import jcifs.internal.SMBSigningDigest;
import jcifs.internal.util.SMBUtil;
import jcifs.util.Crypto;

/**
 * SMB2/SMB3 message signing digest implementation.
 *
 * This class handles cryptographic signing of SMB2/SMB3 messages to ensure
 * message integrity and authenticity. It supports different signing algorithms
 * used in various SMB2/SMB3 dialect versions.
 *
 * @author mbechler
 */

    private boolean bypass = false;
    private int updates;
    private int signSequence;

    /**
     * Constructs a new signing digest with the specified MAC signing key.
     *
     * @param macSigningKey the MAC signing key for message authentication
     * @param bypass whether to bypass MAC signing
     * @throws SmbException if MD5 algorithm is not available
     */

    }

    /**
     * Constructs a signing digest with bypass option and initial sequence number
     *
     * @param macSigningKey
     *            The MAC signing key used for generating signatures
     * @param bypass
     *            Whether to bypass signature verification
     * @param initialSequence
     *            The initial sequence number for signing
     */

    }

    /**
     * Test that signing is properly configured
     */
    @Test
    public void testSigningConfiguration() throws CIFSException {
        BaseConfiguration config = new BaseConfiguration(true);

        // Verify IPC signing is enforced (this is a security requirement)
        assertTrue("IPC signing should be enforced for security", config.isIpcSigningEnforced());
    }

    @DisplayName("Test isSigningEnforced returns true when signing is enforced")
    void testIsSigningEnforcedReturnsTrue() {
        // Given
        when(negotiationRequest.isSigningEnforced()).thenReturn(true);

        // When
        boolean result = negotiationRequest.isSigningEnforced();

        // Then
        assertTrue(result, "isSigningEnforced should return true when signing is enforced");

    /**
     * Checks if message signing is supported but not mandatory.
     *
     * @return whether signatures are supported but not required
     * @throws SmbException if an error occurs checking signing status
     */
    boolean isSigningOptional() throws SmbException;

    /**
     * Checks if message signing is mandatory for this connection.
     *

package jcifs.internal;

/**
 * Interface for SMB message signing and verification operations.
 * Provides cryptographic signing capabilities for SMB protocol messages to ensure
 * message integrity and authenticity using MAC (Message Authentication Code) algorithms.
 *
 * @author mbechler
 */
public interface SMBSigningDigest {

    /**
     * Performs MAC signing of the SMB. This is done as follows.