void cipher(fstream& input, fstream& output, fstream& key) {
    char keyBuffer[9];
    char inputBuffer[2];
    uint16_t in;
    uint16_t out;
    uint32_t k;
    int fileLength = 0;
    stringstream stream;
    bitset<4> outputBitset;


    int i,j;
    bool a;

    input.seekg(0);
    output.seekg(0);

    fileLength = input.tellg();

    input.clear();
    key.clear();

    //Weź klucz
    key.get(keyBuffer, 9);
    stream << hex << keyBuffer;
    stream >> k;
    stream.clear();
    bitset<32> keyBitset(k);
    //CZYTAJ

    for (i = 0; i < fileLength; i++) {
        input.get(inputBuffer,2);
        stream << hex << inputBuffer;
        stream >> in;
        stream.clear();
        bitset<4> inputBitset(in);

        for(j = 0; j < 4;j++) {
            a = keyBitset[0] ^ keyBitset[3] ^ keyBitset[31];
            outputBitset[j] = inputBitset[j] ^ keyBitset[j];
            keyBitset <<= 1;
            keyBitset[0] = a;
        }
        stream << hex << outputBitset.to_ulong();
        stream >> out;
        stream.clear();
        //wypełnij zerami
        inputBitset.reset();
        outputBitset.reset();
        output << hex << out;
        cout << hex << out;
    }
    cout << endl;
    input.close();
    key.close();
    output.close();


}