related to Magniber sample: 19599cad1bbca18ac6473e64710443b7

magniber_key_iv.cpp

#include <Windows.h>
#include <iostream>

#define KEY_SIZE 16

DWORD g_storedVal1 = 0;
DWORD g_storedVal2 = 0;

signed int get_next_val(signed int min_val, signed int max_val)
{
    int tick1;
    signed int res_val;
    if (g_storedVal1 & 1)
    {
        tick1 = g_storedVal2;
    }
    else
    {
        g_storedVal1 |= 1u;
        tick1 = GetTickCount();
    }
    g_storedVal2 = tick1 ^ 1;

    int tick2 = GetTickCount();
    g_storedVal2 = (tick2 + g_storedVal2 + (tick2 + g_storedVal2) / 0x3E8u) & 0x11EE0FFF;
    res_val = min_val + g_storedVal2 % (unsigned int)(max_val - min_val + 1);
    if (res_val < min_val || res_val > max_val)
        res_val = get_next_val(min_val, max_val);
    return res_val;
}

void make_pseudorandom(char buffer[KEY_SIZE])
{
    int indx2 = 0;
    char next_val = 0;
    do
    {
        if (get_next_val(0, 1))
            next_val = get_next_val('0', '9');
        else
            next_val = get_next_val('a', 'z');
        buffer[indx2++] = next_val;
    } while (indx2 < 16);
}

void make_key_iv()
{
    char key[KEY_SIZE + 1] = { 0 };
    char iv[KEY_SIZE + 1] = { 0 };

    make_pseudorandom(key);
    make_pseudorandom(iv);
    std::cout << key << " : " << iv << std::endl;
}

int main()
{
    // make sample set:
    for (size_t i = 0; i < 10; i++) {
        make_key_iv();
    }
    system("pause");
    return 0;
}