Generating a unique computer/user ID using C#

using System;
using System.Management;
using System.Net.NetworkInformation;
using System.Security.Cryptography;
using System.IO;
using System.Text;

namespace UniqueID
{
	class Program
	{
		public static void Main(string[] args)
		{
			Console.WriteLine(GetUniqueID());
			
			// TODO: Implement Functionality Here
			
			Console.Write("Press any key to continue . . . ");
			Console.ReadKey(true);
		}
		

		public static string GetCPUId()
		{
			string cpuInfo = String.Empty;
			string temp = String.Empty;
			ManagementClass mc = new ManagementClass("Win32_Processor");
			ManagementObjectCollection moc = mc.GetInstances();
			foreach (ManagementObject mo in moc)
			{
				if (cpuInfo == String.Empty)
				{// only return cpuInfo from first CPU
					cpuInfo = mo.Properties["ProcessorId"].Value.ToString();
				}
			}
			return cpuInfo;
		}
		
		public static string GetMotherBoardID()
		{
			ManagementObjectCollection mbCol = new ManagementClass("Win32_BaseBoard").GetInstances();
			//Enumerating the list
			ManagementObjectCollection.ManagementObjectEnumerator mbEnum = mbCol.GetEnumerator();
			//Move the cursor to the first element of the list (and most probably the only one)
			mbEnum.MoveNext();
			//Getting the serial number of that specific motherboard
			return ((ManagementObject)(mbEnum.Current)).Properties["SerialNumber"].Value.ToString();
		}
		
		public static string GetMacAddress()
		{
			string macs = "";

			// get network interfaces physical addresses
			NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();
			foreach (NetworkInterface ni in interfaces)
			{
				PhysicalAddress pa = ni.GetPhysicalAddress();
				macs += pa.ToString();
			}
			return macs;
		}
		
		/// <summary>
		/// return Volume Serial Number from hard drive
		/// </summary>
		/// <param name="strDriveLetter">[optional] Drive letter</param>
		/// <returns>[string] VolumeSerialNumber</returns>
		public static string GetVolumeSerial()
		{
			string strDriveLetter = "";
			
			ManagementClass mc = new ManagementClass("Win32_PhysicalMedia");
			ManagementObjectCollection moc = mc.GetInstances();
			foreach (ManagementObject mo in moc)
			{
				try
				{
					if ((UInt16)mo["MediaType"] == 29)
					{
						String serial = mo["SerialNumber"].ToString().Trim();
						if (!String.IsNullOrEmpty(serial))
						{
							Console.WriteLine("Harddrive serial: " + (string)mo["SerialNumber"]);
							strDriveLetter = (string)mo["SerialNumber"];
							return strDriveLetter;
						}
					}
					
				}
				catch{}
				
			}
			return strDriveLetter;
		}

		
		public static string GetUniqueID()
		{
			string ID = GetCPUId() + GetMotherBoardID() + GetMacAddress() + GetVolumeSerial();
			// generate hash
			HMACSHA1 hmac = new HMACSHA1();
			hmac.Key = Encoding.ASCII.GetBytes(GetMotherBoardID());
			hmac.ComputeHash(Encoding.ASCII.GetBytes(ID));

			// convert hash to hex string
			StringBuilder sb = new StringBuilder();
			for (int i = 0; i < hmac.Hash.Length; i++)
			{
				sb.Append(hmac.Hash[i].ToString("X2"));
			}

			return sb.ToString();

		}

	}
}

/// 

/// Return the serial number of the motherboard
/// 

/// [string] SN of motherboard
public static string GetMBSN()
{
            //Getting list of motherboards
            ManagementObjectCollection mbCol = new ManagementClass("Win32_BaseBoard").GetInstances();
            //Enumerating the list
            ManagementObjectCollection.ManagementObjectEnumerator mbEnum = mbCol.GetEnumerator();
            //Move the cursor to the first element of the list (and most probably the only one)
            mbEnum.MoveNext();
            //Getting the serial number of that specific motherboard
            return ((ManagementObject)(mbEnum.Current)).Properties["SerialNumber"].Value.ToString();
}

Fabrice Vergnenegre wrote:

I think this can be of value for your licensing scheme

hk11 wrote:

Win32_ComputerSystemProduct.UUID ? This is unique

Felipe Amorim wrote:

Does removable drives (pen drives) count as logical drives? In a more controlled environment (corporate, small business) this maybe a good alternative but when you have a global scope of users maybe the use of a username/password system allowing only one session foreach user might be a better solution.