blwstraw.h

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/*
**  Command & Conquer Generals Zero Hour(tm)
**  Copyright 2025 Electronic Arts Inc.
**
**  This program is free software: you can redistribute it and/or modify
**  it under the terms of the GNU General Public License as published by
**  the Free Software Foundation, either version 3 of the License, or
**  (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
 
/*********************************************************************************************** 
 ***              C O N F I D E N T I A L  ---  W E S T W O O D  S T U D I O S               *** 
 *********************************************************************************************** 
 *                                                                                             * 
 *                 Project Name : Command & Conquer                                            * 
 *                                                                                             * 
 *                     $Archive:: /Commando/Library/BLWSTRAW.H                                $* 
 *                                                                                             * 
 *                      $Author:: Greg_h                                                      $*
 *                                                                                             * 
 *                     $Modtime:: 7/22/97 11:37a                                              $*
 *                                                                                             * 
 *                    $Revision:: 1                                                           $*
 *                                                                                             *
 *---------------------------------------------------------------------------------------------* 
 * Functions:                                                                                  * 
 * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 
#ifndef BLWSTRAW_H
#define BLWSTRAW_H
 
#include    "straw.h"
#include    "blowfish.h"
 
 
/*
**  Performs Blowfish encryption/decryption to the data that is drawn through this straw. The
**  process is controlled by the key which must be submitted to the class before any data
**  manipulation will occur. The Blowfish algorithm is symmetric, thus the same key is used
**  for encryption as is for decryption.
*/
class BlowStraw : public Straw
{
    public:
        typedef enum CryptControl {
            ENCRYPT,
            DECRYPT
        } CryptControl;
 
        BlowStraw(CryptControl control) : BF(NULL), Counter(0), Control(control) {}
        virtual ~BlowStraw(void) {delete BF;BF = NULL;}
 
        virtual int Get(void * source, int slen);
 
        // Submit key for blowfish engine.
        void Key(void const * key, int length);
 
    protected:
        /*
        **  The Blowfish engine used for encryption/decryption. If this pointer is
        **  NULL, then this indicates that the blowfish engine is not active and no
        **  key has been submitted. All data would pass through this straw unchanged
        **  in that case.
        */
        BlowfishEngine * BF;
 
    private:
        char Buffer[8];
        int Counter;
        CryptControl Control;
 
        BlowStraw(BlowStraw & rvalue);
        BlowStraw & operator = (BlowStraw const & straw);
};
 
 
#endif