Game Keygen

//Generates valid registration keys for a game on the PocketPC
#include<iostream>
#include<ctime>

const char gameId[] = {'D', 'A', 'T', 'A'};

char to_char(char i) {
    if(i>=36) return 0;
    if(i<10) return char(i)+'0';
    return i-10+'A';
}

int main() {
    unsigned char ikeys[8];
    unsigned int a[6];
    unsigned int u1 = gameId[0] + gameId[1];
    unsigned int u2 = gameId[2] + gameId[3];
    srand(time(NULL));
    for(int i=0;i<8;++i)
        ikeys[i] = rand() % 0x24;
    a[0] = (ikeys[0] + ikeys[1] + ikeys[2] + ikeys[3]) % 0x24;
    a[1] = (ikeys[4] + ikeys[5] + ikeys[6] + ikeys[7]) % 0x24;

    a[2] = (ikeys[0] * ikeys[1] * ikeys[2] * ikeys[3]) % 0x24;
    a[3] = (ikeys[4] * ikeys[5] * ikeys[6] * ikeys[7]) % 0x24;

    a[4] = (a[0] * u1) % 0x24;
    a[5] = (a[1] * u2) % 0x24;

    char skeys[] = { to_char(ikeys[0]), to_char(ikeys[4]), to_char(a[2]),
                     to_char(ikeys[1]), to_char(ikeys[5]), to_char(a[3]),
                     to_char(ikeys[2]), to_char(ikeys[6]), to_char(a[4]),
                     to_char(ikeys[3]), to_char(ikeys[7]), to_char(a[5]) };

    std::cout << "Random valid key: ";
    for(auto c: skeys) std::cout << c << " ";
    std::cout << '\n';
}