[C#] 라이선스용 컴퓨터 유일키 생성

[C#] 라이선스용 컴퓨터 유일키 생성 Introduction For licensing purpose according to me the best way and secure way is to generate an unique key for client's machine and providing a corresponding license key for that key. For this purpose you can take help of the unique id of client's computer's motherboard, BIOS and processor's. When you get these IDs you can generate any key of your preferable format. Year ago I found a very handy and useful code in C# by searching net to get these IDs. And its serving me perfectly so far. Thanks to the original author of the code. I added some additional code to generate a 128 bit key of a machine. The output is a nice looking key in hexadecimal format (eg. 4876-8DB5-EE85-69D3-FE52-8CF7-395D-2EA9) Suggestions I have few suggestions on this regard. *) Generate key from only Motherboard, Processor and BIOS. Since user normally doesn't chagne these parts. *) Don't use MAC ID, Graphics Card ID AND Disk ID. Since its very common to change these devices. *) It takes significant time to get IDs of devices. So make the finger print generating fucntion static and save it in a static variable so that it generates the key only for one time in the whole application. The Code Here is the class. The code in the region "Original Device ID Getting Code" is from the original author.  ============================================================================== 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();                 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 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     } }