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/*

 * Copyright (C) 2024 by Andreas Theofilu <andreas@theosys.at>

 *

 * 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, write to the Free Software Foundation,

 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA

 */

#ifndef TSCRAMBLE_H

#define TSCRAMBLE_H

#include <string>

#include <openssl/core.h>

#define AES128_KEY_SIZE     16

#define AES128_SALT_SIZE    8

class TScramble

{

    public:

        TScramble();

        ~TScramble();

        bool aesInit(const std::string& key, const std::string& salt);

        bool aesDecodeFile(std::ifstream& is);

        bool aesDecodeFile(const std::string& fname);

        unsigned char *getAesKey(size_t& len) { len = AES128_KEY_SIZE; return mAesKey; }

        unsigned char *getAesSalt(size_t& len) { len = AES128_SALT_SIZE; return mAesSalt; }

        unsigned char *getAesIV(size_t& len) { len = AES128_KEY_SIZE; return mAesIV; }

        std::string& getDecrypted() { return mDecrypted; }

        void aesReset() { mAesInitialized = false; }

    private:

        unsigned char mAesKey[AES128_KEY_SIZE];     // Key used for decryption/encryption

        unsigned char mAesSalt[AES128_SALT_SIZE];   // Salt for decryption/encryption

        unsigned char mAesIV[AES128_KEY_SIZE];      // Initialization Vector

        EVP_CIPHER_CTX *mCtx{nullptr};              // Context

        std::string mDecrypted;                     // Buffer for clear (decrypted) text

        bool mAesInitialized{false};                // TRUE if initialized

};

#endif // TSCRAMBLE_H