/**
        * initialise the RSA engine.
        *
        * @param forEncryption true if we are encrypting, false otherwise.
        * @param param the necessary RSA key parameters.
        */
        public void Init(
            bool				forEncryption,
            ICipherParameters	parameters)
        {
            if (core == null)
                core = new RsaCoreEngine();

            core.Init(forEncryption, parameters);
        }
        /**
         * initialise the RSA engine.
         *
         * @param forEncryption true if we are encrypting, false otherwise.
         * @param param the necessary RSA key parameters.
         */
        public void Init(
            bool forEncryption,
            ICipherParameters parameters)
        {
            if (core == null)
            {
                core = new RsaCoreEngine();
            }

            core.Init(forEncryption, parameters);
        }