crackz

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    class Program
    {
        static uint Crc32(params byte[] data)
        {
            uint crc = 0xFFFFFFFF;
            for (int i = 0; i < data.Length; i++)
            {
                crc = crc ^ data[i];
                for (int j = 0; j < 8; j++)
                {
                    if ((crc & 1) == 1)
                    {
                        crc = (crc >> 1) ^ 0xEDB88320;
                    }
                    else
                    {
                        crc >>= 1;
                    }
                }
            }
            return crc ^ 0xFFFFFFFF;
        }


        static void Main(string[] args)
        {
            const string giveawayLetters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
            byte[] giveawayBytes = Encoding.ASCII.GetBytes(giveawayLetters);

            Parallel.ForEach(giveawayBytes, ( l1, state ) =>
                {
                    foreach (byte l2 in giveawayBytes)
                    {
                        foreach (byte l3 in giveawayBytes)
                        {
                            foreach (byte l4 in giveawayBytes)
                            {
                                foreach (byte l5 in giveawayBytes)
                                {
                                    if (Crc32(l1, l2, l3, l4, l5) == 0x01A72207)
                                    {
                                        Console.WriteLine("{0}{1}{2}{3}{4}",
                                            Convert.ToChar(l1),
                                            Convert.ToChar(l2),
                                            Convert.ToChar(l3),
                                            Convert.ToChar(l4),
                                            Convert.ToChar(l5));
                                        state.Break();
                                    }
                                }
                            }
                        }
                    }
                });
            Console.WriteLine();
        }
    }
}