break;
        case KerberosConstants.RC4_ENC_TYPE:
            decrypt = decryptRC4(data, key);
            break;
        default:
            throw new GeneralSecurityException("Unsupported encryption type " + type);
        }
        return decrypt;
    }


    /**
     * @param data
     * @param key
     * @return
     * @throws GeneralSecurityException

     * 
     * This is an experimental option allowing to indicate support during protocol
     * negotiation, SMB encryption is not implemented yet.
     * 
     * @return whether SMB encryption is enabled
     * @since 2.1
     */
    boolean isEncryptionEnabled ();


    /**
     * 

     */
    @Override
    public SmbTransportImpl acquire () {
        return (SmbTransportImpl) super.acquire();
    }


    /**
     * @return the server's encryption key
     */
    @Override
    public byte[] getServerEncryptionKey () {
        if ( this.negotiated == null ) {
            return null;
        }