* @throws CIFSException if encryption fails or is not enabled
     */
    public byte[] encryptMessage(byte[] message) throws CIFSException {
        if (this.encryptionContext == null) {
            throw new CIFSException("Encryption not enabled for this session");
        }
        return this.encryptionContext.encryptMessage(message, this.sessionId);
    }

    /**