}

    /**
     * Derives the SMB3 decryption key from the session key using the appropriate KDF for the dialect.
     *
     * @param dialect the SMB dialect version
     * @param sessionKey the base session key
     * @param preauthIntegrity the pre-authentication integrity hash (for SMB 3.1.1) or null
     * @return derived decryption key
     */

...
```

### Encrypted/Object locked objects

        assertEquals(invertibleCryptographer, provider.providePrimaryInvertibleCryptographer());
        assertEquals(md5, provider.providePrimaryOneWayCryptographer());
    }

    // Test encryption and decryption functionality
    public void test_invertibleCryptography() {
        // Test that invertible cryptography works correctly

    /**
     * Gets the flags field which contains flags in SMB 3.1.1 or encryption algorithm ID in SMB 3.0/3.0.2
     *
     * @return the flags (SMB 3.1.1) or encryption algorithm (SMB 3.0/3.0.2)
     */
    public int getFlags() {
        return this.flags;
    }

    /**
     * Sets the flags field which contains flags in SMB 3.1.1 or encryption algorithm ID in SMB 3.0/3.0.2
     *
     * @param flags

import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

import jcifs.CIFSUnsupportedCryptoException;

/**
 * Cryptographic utility class providing encryption and decryption functionality for jCIFS.
 * Handles security provider initialization and cryptographic operations for SMB authentication.
 *
 * @author mbechler
 */
public final class Crypto {

          // Consuming server Finished handshake message
          // Produced ClientHello handshake message
          //
          // Raw write
          // Raw read
          // Plaintext before ENCRYPTION
          // Plaintext after DECRYPTION
          val message = record.message
          val parameters = record.parameters

          if (parameters != null && !message.startsWith("Raw") && !message.startsWith("Plaintext")) {

import javax.security.auth.Destroyable;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Secure credential storage with encryption at rest.
 *
 * Provides secure storage of passwords and other sensitive credentials
 * using AES-GCM encryption with PBKDF2 key derivation.
 *
 * Features:
 * - Encrypts credentials at rest using AES-256-GCM
 * - Uses PBKDF2 for key derivation from master password

        assertFalse(session.isConnected());
        assertTrue(session.isFailed());
    }

    @Test
    @DisplayName("encryption: flags, encryption, and decryption delegation")
    void testEncryptionDelegation() throws Exception {
        SmbSessionImpl session = newSession();

        // No encryption context -> throws
        CIFSException notEnabled = assertThrows(CIFSException.class, () -> session.encryptMessage(new byte[] { 1 }));

    /**
     * The key for user roles in the request attribute.
     */
    protected static final String USER_ROLES = "userRoles";

    /**
     * The cached cipher for encryption and decryption.
     */
    protected CachedCipher cipher;

    /**
     * The separator for values in the role string.
     */
    protected String valueSeparator = "\n";

    /**

	isCompressed, err := oi.IsCompressedOK()
	if err != nil {
		return nil, 0, 0, err
	}

	// if object is encrypted and it is a restore request or if NoDecryption
	// was requested, fetch content without decrypting.
	if opts.Transition.RestoreRequest != nil || opts.NoDecryption {
		isEncrypted = false
		isCompressed = false
	}

	// Calculate range to read (different for encrypted/compressed objects)
	switch {