namespace FindKey { internal class Program { static void Main() { var parallelOptions = new ParallelOptions { MaxDegreeOfParallelism = 6 }; Parallel.For(0, 10000, parallelOptions, (i, state) => { for (int j = 0; j <= 9999; j++) { if (CheckIfMatchesCondition(i, j)) { Console.WriteLine($"Found match: {i:D4}-{j:D4}"); state.Stop(); break; } } }); } static bool CheckIfMatchesCondition(int p1, int p2) { uint edx = (uint)p1; uint ecx = (uint)p2; uint ebx; int eax = 0xD00B; do { edx ^= ecx; ebx = (ecx << 2) + (edx >> 2); ecx = ebx ^ edx; } while (--eax > 0); return ebx == 0x6F3AAD5A; } } }