http://www.zedwood.com/article/cpp-sha256-function

vector<int> sha256genroll(string const &value, string const &seed, string const &lotto)
{
    int str = std::stoi(value.substr(0, 6));
    int end = std::stoi(value.substr(7, 6));
    vector<int> int_list;
    int length = end - str;
    for( int i = 0; i <= length; i++ )
    {
        string msgh = seed + "-" + lotto + "-" + to_string(str + i);
        string hash = sha256(msgh).substr(0, 8);

        unsigned long x;
        stringstream ss;
        ss << hex << hash;
        ss >> x;
        x = x % 15;
        if( x > 0 && x < 8  )
            x = 1;
        else
        if( x > 7 && x < 15 )
            x = 2;
        int_list.push_back(x);
    }
    return int_list;
}