:) "Your static only class" is any class you like. In C# every function belongs to a class. For some generic functions (that are not related to an object or class) you normally create a static class (you can't create an instance of this class). A static class can only contain static members (variables and functions). Generally you can call your class whatever you want, but in your case the class should be named "Md5".

Otherwise this code wouldn't work:

var hash=Md5.Md5Sum(name + score + secretKey);

When you already have an own static class for your other static methods, you can add the Md5Sum function to that class but then you have to use:

var hash=YourStaticClassName.Md5Sum(name + score + secretKey);

There´s a way to do it with the .js version?