using System;
using System.Management;
using System.Security.Cryptography;
using System.Security;
using System.Collections;
using System.Text;
namespace Security
{/// <summary>/// Generates a 16 byte Unique Identification code of a computer/// Example: 4876-8DB5-EE85-69D3-FE52-8CF7-395D-2EA9/// </summary>public class FingerPrint  {private static string fingerPrint = string.Empty;public static string Value(){if (string.IsNullOrEmpty(fingerPrint)){fingerPrint = GetHash("CPU >> " + cpuId() + "\nBIOS >> " + biosId() + "\nBASE >> " + baseId()//+"\nDISK >> "+ diskId() + "\nVIDEO >> " + videoId() +"\nMAC >> "+ macId());}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();elses += n2.ToString();if (n1 > 9)s += ((char)(n1 - 10 + (int)'A')).ToString();elses += n1.ToString();if ((i + 1) != bt.Length && (i + 1) % 2 == 0) s += "-";}return s;}#region Original Device ID Getting Code//Return a hardware identifierprivate 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 oneif (result == ""){try{result = mo[wmiProperty].ToString();break;}catch{}}}}return result;}//Return a hardware identifierprivate 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 oneif (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 consumingstring 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 securityretVal += identifier("Win32_Processor", "MaxClockSpeed");}}return retVal;}//BIOS Identifierprivate 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 IDprivate static string diskId(){return identifier("Win32_DiskDrive", "Model")+ identifier("Win32_DiskDrive", "Manufacturer")+ identifier("Win32_DiskDrive", "Signature")+ identifier("Win32_DiskDrive", "TotalHeads");}//Motherboard IDprivate static string baseId(){return identifier("Win32_BaseBoard", "Model")+ identifier("Win32_BaseBoard", "Manufacturer")+ identifier("Win32_BaseBoard", "Name")+ identifier("Win32_BaseBoard", "SerialNumber");}//Primary video controller IDprivate static string videoId(){return identifier("Win32_VideoController", "DriverVersion")+ identifier("Win32_VideoController", "Name");}//First enabled network card IDprivate static string macId(){return identifier("Win32_NetworkAdapterConfiguration", "MACAddress", "IPEnabled");}#endregion}
}

        private static string localkey(){string path=Environment.CurrentDirectory + "client.key";if (File.Exists(path)){StreamReader sr = new StreamReader(path);string key= sr.ReadToEnd();sr.Close();return key;}else{StreamWriter sw = File.CreateText(path);string key = Guid.NewGuid().ToString();sw.WriteLine(key);sw.Close();return key;}}