Open Source .NET License Tool, EasyLicense !

LoveJenny

5.00/5 (19 votes)

Jul 2, 2017

MIT

38439

EasyLicense is an open-source license tool for .NET applications.

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:

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.");

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);

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.