/// <summary>
/// Combine CPU ID, Disk C Volume Serial Number and Motherboard Serial Number as device Id
/// </summary>
/// <param name="appName">Name of the application.</param>
/// <returns>System.String.</returns>
internal static string GenerateUID(string appName)
{
//Combine the IDs and get bytes
var _id = $"{appName}.{GetProcessorId()}{GetMotherboardID()}";
var _byteIds = Encoding.UTF8.GetBytes(_id);
//Use MD5 to get the fixed length checksum of the ID string
var _md5 = new MD5CryptoServiceProvider();
var _checksum = _md5.ComputeHash(_byteIds);
//Convert checksum into 4 ulong parts and use BASE36 to encode both
var _part1Id = BASE36.Encode(BitConverter.ToUInt32(_checksum, 0));
var _part2Id = BASE36.Encode(BitConverter.ToUInt32(_checksum, 4));
var _part3Id = BASE36.Encode(BitConverter.ToUInt32(_checksum, 8));
var _part4Id = BASE36.Encode(BitConverter.ToUInt32(_checksum, 12));
//Concat these 4 part into one string
return($"{_part1Id}-{_part2Id}-{_part3Id}-{_part4Id}".Substring(0, 28));
}
/// <summary>
/// Gets the uid in bytes.
/// </summary>
/// <param name="UID">The uid.</param>
/// <returns>System.Byte[].</returns>
/// <exception cref="ArgumentException">Wrong UID</exception>
/// <exception cref="System.ArgumentException">Wrong UID</exception>
internal static byte[] GetUIDInBytes(string UID)
{
//Split 4 part Id into 4 ulong
var _ids = UID.Split('-');
if (_ids.Length != 4)
{
throw new ArgumentException("Wrong UID");
}
//Combine 4 part Id into one byte array
var _value = new byte[16];
Buffer.BlockCopy(BitConverter.GetBytes(BASE36.Decode(_ids[0])), 0, _value, 0, 8);
Buffer.BlockCopy(BitConverter.GetBytes(BASE36.Decode(_ids[1])), 0, _value, 8, 8);
Buffer.BlockCopy(BitConverter.GetBytes(BASE36.Decode(_ids[2])), 0, _value, 16, 8);
Buffer.BlockCopy(BitConverter.GetBytes(BASE36.Decode(_ids[3])), 0, _value, 24, 8);
return(_value);
}