.thenThrow(new GeneralSecurityException("Decryption error"));

            PACDecodingException e = assertThrows(PACDecodingException.class, () -> new KerberosTicket(token, (byte) 0, keys));
            assertTrue(e.getMessage().startsWith("Decryption failed"));
        }
    }

    @Test

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

    @Test
    @DisplayName("Should derive decryption key for SMB 3.1.1 dialect")
    void testDeriveDecryptionKey_SMB311() {

import org.codelibs.core.exception.UnsupportedEncodingRuntimeException;
import org.codelibs.core.misc.Base64Util;

/**
 * A high-performance utility class for encrypting and decrypting data using cached {@link Cipher} instances.
 * <p>
 * This class provides efficient encryption/decryption by pooling and reusing cipher instances,
 * reducing the overhead of repeated cipher initialization. It supports both string-based keys

                // Log but don't fail - concurrent encryption/decryption with same context is complex
                System.out.println("Sample decryption failed (acceptable for concurrent test): " + e.getMessage());
            }
        }

        // Cleanup
        context.close();
    }

    @Test
    @DisplayName("Should handle AES-CCM encryption correctly")
    void testAESCCMEncryption() throws Exception {

## Acronyms

- **AEAD**: Authenticated Encryption with Associated Data
- **CSPRNG**: Cryptographically Secure Pseudo Random Number Generator
- **EK**: External Key
- **IV**: Initialization Vector
- **KEK**: Key Encryption Key
- **OEK**: Object Encryption Key
- **PRF**: Pseudo Random Function
- **SSE**: Server-Side Encryption
- **SSE-C**: Server-Side Encryption with client-provided Keys

    /**
     * Decrypts Kerberos encrypted data using the specified key.
     *
     * @param data the encrypted data to decrypt
     * @param key the decryption key
     * @param type the encryption type
     * @return the decrypted data
     * @throws GeneralSecurityException if decryption fails
     */
    public static byte[] decrypt(byte[] data, Key key, int type) throws GeneralSecurityException {
        Cipher cipher = null;

// objects are slightly larger due to encryption overhead.
// Further, it decrypts all single-part SSE-S3 encrypted objects
// and formats ETags of SSE-C / SSE-KMS encrypted objects to
// be AWS S3 compliant.
//
// DecryptETags uses a KMS bulk decryption API, if available, which
// is more efficient than decrypting ETags sequentially.

	// the ciphertext.
	Name string

	// Version is the version of the master used for
	// decryption. If empty, the latest key version
	// is used.
	Version int

	// Ciphertext is the encrypted data that gets
	// decrypted.
	Ciphertext []byte

	// AssociatedData is the crypto. associated data.
	// It must match the data used during encryption
	// or data key generation.
	AssociatedData Context
}

          // 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")) {

        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 }));