Open Source .NET License Tool, EasyLicense !

Introduction

I used to wonder whether there is a license tool, which makes it easy to create a license, and easy to validate the license.

Although this feature is very common when you need to license your software, I can't find a license tool, which is easy to use. Most of the license tools are too complex, and have more features, but I don't need to use them.

So I created this project to make the license process easier. Its code is short, and easy to understand.

Using the Code

Easy License is very easy to use.

To license a software, we need these three steps:

1. Create a public/private Key:

   if (File.Exists("privateKey.xml") || File.Exists("publicKey.xml"))
   {
       var result = MessageBox.Show("The key is existed, 
       override it?", "Warning", MessageBoxButton.YesNo);
       if (result == MessageBoxResult.No)
       {
           return;
       }
   }
   
   var privateKey = "";
   var publicKey = "";
   LicenseGenerator.GenerateLicenseKey(out privateKey, out publicKey);
   
   File.WriteAllText("privateKey.xml", privateKey);
   File.WriteAllText("publicKey.xml", publicKey);
   
   MessageBox.Show("The Key is created, please backup it.");

2. Use private key to create a license:

   if (!File.Exists("privateKey.xml"))
   			{
   				MessageBox.Show("Please create a license key first");
   				return;
   			}
    
   			var privateKey = File.ReadAllText(@"privateKey.xml");
   			var generator = new LicenseGenerator(privateKey);
    
   			var dictionary = new Dictionary<string, string>();
    
   			// generate the license
   			var license = generator.Generate("EasyLicense", Guid.NewGuid(), 
                                                 DateTime.UtcNow.AddYears(1), dictionary,
   				                              LicenseType.Standard);
   			
   			txtLicense.Text = license;
   			File.WriteAllText("license.lic", license);

3. Use public key to validate the license:

   private static void ValidateLicense()
   		{
   			if (!File.Exists("publicKey.xml"))
   			{
   				MessageBox.Show("Please create a license key first");
   				return;
   			}
   			
   			var publicKey = File.ReadAllText(@"publicKey.xml");
    
   			var validator = new LicenseValidator(publicKey, @"license.lic");
    
   			try
   			{
   				validator.AssertValidLicense();
   			}
   			catch (Exception ex)
   			{
   				Console.WriteLine(ex.Message);
   			}

Points of Interest

All these functions are provided by a LicenseTool tool, you can download the source, and run this tool to see how EasyLicense creates, validates a license.

To validate the license, I create a demo project:

Git

• https://github.com/EasyHelper/EasyLicense

License

History

add Rhino Licensing author mail.

• 4^th July, 2017: Initial version
• Add Rhino-licensing author mail.