#include <iostream>
#include <sstream>
#include <iomanip>


std::string encrypttoken(std::string str) {
    unsigned short key = 0, _secret = 0x9EE;
    int _length = str.size();
    std::ostringstream result;

    for (int i = 0; i < _length; i++) {
        str[i] = key = str[i] ^ (_secret >> 8);
        result << std::hex << std::setfill('0') << std::setw(2) << key;
        _secret = key = (_secret + key) * 0xD201 + 0x7F6A;
    }
    return result.str();
}

int main() {

    std::cout << "\tMtk_Auth_Oneclick_V3.3 KeyGen\n" <<
        " \tBy EarthMan123 - AT4RE TEAM\n" << std::endl;

    std::string name, hardwareid, serial = "";

    std::cout << "Desired name: ";
    std::getline(std::cin, name);
    name = "AT4RE-" + name;

    std::cout << "HardwareID: ";
    std::cin >> hardwareid;

    unsigned short namelen = name.size();

    serial = hardwareid + name[0];
    if (namelen >= 4) {
        serial += name[3];
        if (namelen >= 6) {
            serial += name[5];
            if (namelen >= 10) {
                serial += name[9];
            }
        }
    }

    std::cout << "\n\n\n<<< Registration Information >>>\n";
    std::cout << "==> UserID: " << name << std::endl;
    std::cout << "==> Serial: " << encrypttoken(serial) << std::endl;
    std::cout << "********************************\n";

    system("pause");

    return 0;
}