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//CPU ID
string sQuery = "SELECT ProcessorId FROM Win32_Processor";
ManagementObjectSearcher oManagementObjectSearcher = new ManagementObjectSearcher(sQuery);
ManagementObjectCollection oCollection = oManagementObjectSearcher.Get();
foreach (ManagementObject oManagementObject in oCollection)
{
sProcessorID = (string)oManagementObject["ProcessorId"];
}  
//HDD ID
ManagementObjectSearcher searcher = new
ManagementObjectSearcher("SELECT * FROM Win32_DiskDrive");
foreach(ManagementObject wmi_HD in searcher.Get())
{
HardDrive hd = new HardDrive();
hd.Model = wmi_HD["Model"].ToString();
hd.Type = wmi_HD["InterfaceType"].ToString();
hdCollection.Add(hd);
}
 
//HDD SERI NO
ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_PhysicalMedia");
foreach(ManagementObject wmi_HD in searcher.Get())
{
HardDrive hd = (HardDrive)hdCollection[i];
if (wmi_HD["SerialNumber"] == null)
hd.SerialNo = "None";
else
hd.SerialNo = wmi_HD["SerialNumber"].ToString();
}
 
//BIOS BILGILERI
ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_BIOS");
ManagementObjectCollection collection = searcher.Get();
var items = new List<Win32_BIOS>();
foreach (ManagementObject obj in collection)
{
var item = new Win32_BIOS();
item.BuildNumber = (string)obj["BuildNumber"];
item.IdentificationCode = (string)obj["IdentificationCode"];;
item.SerialNumber = (string)obj["SerialNumber"];
item.SoftwareElementID = (string)obj["SoftwareElementID"];
items.Add(item);
}

/* ---------------------------------- */

/// <summary>
/// Generates a 16 byte Unique Identification code of a computer
/// Example: 4876-8DB5-EE85-69D3-FE52-8CF7-395D-2EA9
/// </summary>
public class Security
{
    private static string fingerPrint = string.Empty;
    public static string Value()
    {
        if (string.IsNullOrEmpty(fingerPrint))
        {

            fingerPrint = GetHash("CPU >> " + cpuId() + "\nBIOS >> " + biosId() + "\nBASE >> " + baseId() + videoId());
            //+ "\nMAC >> " + macId()
            //+"\nDISK >> "+ diskId() + "\nVIDEO >> " + 

        }
        return fingerPrint;
    }
    private static string GetHash(string s)
    {
        MD5 sec = new MD5CryptoServiceProvider();
        ASCIIEncoding enc = new ASCIIEncoding();
        byte[] bt = enc.GetBytes(s);
        return GetHexString(sec.ComputeHash(bt));
    }
    private static string GetHexString(byte[] bt)
    {
        string s = string.Empty;
        for (int i = 0; i < bt.Length; i++)
        {
            byte b = bt[i];
            int n, n1, n2;
            n = (int)b;
            n1 = n & 15;
            n2 = (n >> 4) & 15;
            if (n2 > 9)
                s += ((char)(n2 - 10 + (int)'A')).ToString();
            else
                s += n2.ToString();
            if (n1 > 9)
                s += ((char)(n1 - 10 + (int)'A')).ToString();
            else
                s += n1.ToString();
            if ((i + 1) != bt.Length && (i + 1) % 2 == 0) s += "-";
        }
        return s;
    }
    #region Original Device ID Getting Code
    //Return a hardware identifier
    private static string identifier
    (string wmiClass, string wmiProperty, string wmiMustBeTrue)
    {
        string result = "";
        System.Management.ManagementClass mc =
    new System.Management.ManagementClass(wmiClass);
        System.Management.ManagementObjectCollection moc = mc.GetInstances();
        foreach (System.Management.ManagementObject mo in moc)
        {
            if (mo[wmiMustBeTrue].ToString() == "True")
            {
                //Only get the first one
                if (result == "")
                {
                    try
                    {
                        result = mo[wmiProperty].ToString();
                        break;
                    }
                    catch
                    {
                    }
                }
            }
        }
        return result;
    }
    //Return a hardware identifier
    private static string identifier(string wmiClass, string wmiProperty)
    {
        string result = "";
        System.Management.ManagementClass mc =
    new System.Management.ManagementClass(wmiClass);
        System.Management.ManagementObjectCollection moc = mc.GetInstances();
        foreach (System.Management.ManagementObject mo in moc)
        {
            //Only get the first one
            if (result == "")
            {
                try
                {
                    result = mo[wmiProperty].ToString();
                    break;
                }
                catch
                {
                }
            }
        }
        return result;
    }
    private static string cpuId()
    {
        //Uses first CPU identifier available in order of preference
        //Don't get all identifiers, as it is very time consuming
        string retVal = identifier("Win32_Processor", "UniqueId");

        if (retVal == "") //If no UniqueID, use ProcessorID
        {
            retVal = identifier("Win32_Processor", "ProcessorId");
            if (retVal == "") //If no ProcessorId, use Name
            {
                retVal = identifier("Win32_Processor", "Name");
                if (retVal == "") //If no Name, use Manufacturer
                {
                    retVal = identifier("Win32_Processor", "Manufacturer");
                }
                //Add clock speed for extra security
                retVal += identifier("Win32_Processor", "MaxClockSpeed");
            }
        }
        return retVal;
    }
    //BIOS Identifier
    private static string biosId()
    {
        return identifier("Win32_BIOS", "Manufacturer")
        + identifier("Win32_BIOS", "SMBIOSBIOSVersion")
        + identifier("Win32_BIOS", "IdentificationCode")
        + identifier("Win32_BIOS", "SerialNumber")
        + identifier("Win32_BIOS", "ReleaseDate")
        + identifier("Win32_BIOS", "Version");
    }
    //Main physical hard drive ID
    private static string diskId()
    {
        return identifier("Win32_DiskDrive", "Model")
        + identifier("Win32_DiskDrive", "Manufacturer")
        + identifier("Win32_DiskDrive", "Signature")
        + identifier("Win32_DiskDrive", "TotalHeads");
    }
    //Motherboard ID
    private static string baseId()
    {
        return identifier("Win32_BaseBoard", "Model")
        + identifier("Win32_BaseBoard", "Manufacturer")
        + identifier("Win32_BaseBoard", "Name")
        + identifier("Win32_BaseBoard", "SerialNumber");
    }
    //Primary video controller ID
    private static string videoId()
    {
        return identifier("Win32_VideoController", "DriverVersion")
        + identifier("Win32_VideoController", "Name");
    }
    //First enabled network card ID
    private static string macId()
    {
        return identifier("Win32_NetworkAdapterConfiguration",
            "MACAddress", "IPEnabled");
    }
    #endregion
}