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Before we get into the specific C# syntax, I just want to show you that there isn t anything mystical about a delegate; in fact, there is a class in the .NET Framework called Delegate which encapsulates the behavior for us. As you might expect, it uses properties to store the reference to the function. There are two, in fact: Method (which indicates which member function to use) and Target (which tells us the object on which the method should be executed, if any). As you can see, the whole thing is not totally dissimilar in concept from our previous DocumentProcess base class, but we don t need to derive from Delegate to supply the function to call. That ability has moved into a property instead. That s all there is to a delegate, really.

However, it is such a powerful and useful tool that the C# language designers have provided us with special language syntax to declare new Delegate types, assign the appropriate function, and then call it in a much more compact and expressive fashion. It also allows the compiler to check that all the parameter and return types match up along the way, rather than producing errors at runtime if you get it wrong. It is so compact, expressive, and powerful that you can probably get through your entire C# programming career without ever worrying about the classes the C# compiler emits which derive from that Delegate class and implement it all.

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So, why have we just spent a page or so discussing these implementation details, if we re never going to see them again While you don t usually need to use the Delegate class directly, it is easy to get confused by language-specific voodoo and lose track of what a delegate really is: it is just an object, which in turn calls whichever function we like, all specified through a couple of properties.

Let s start by defining a new delegate type to reference our document processing functions. As I mentioned earlier, rather than using that Delegate class, C# lets us define a delegate type using syntax which looks pretty much like a function declaration, prefixed with the keyword delegate:

delegate void DocumentProcess(Document doc);

At the same time, the smart card chip, even with the help of a cryptographic accelerator, has a limited amount of CPU power One disadvantage of using some smart cards to store secrets is that when a user inserts a smart card into a reader and enters a PIN, the reader is trusted with that PIN If the reader is malicious (ie, has been constructed by an attacker), the reader can capture the PIN, and, for instance, execute multiple transactions instead of just one Another disadvantage of using some smart card implementations is that they are vulnerable to power attacks Though the bits of the key are protected on the tamper-resistant chip, Paul Kocher and others were able to devise some attacks against the smart card While the card is doing computation, an attacker can read and gather data about the card.

That defines a delegate type for a method which returns void, and takes a single Document parameter. The delegate s type name is DocumentProcess.

Anyone who has sensibly decided not to go any further into the implementation details can skip this sidebar. For those still reading... When you declare a delegate like this, under the covers C# emits a class called DocumentProcess, derived from MulticastDelegate (which is a subclass of Delegate). Among other things, that emitted class has a function called Invoke(int param) which matches the signature we declared on the delegate. So how is Invoke implemented Surprisingly, it doesn t have any method body at all! Instead, all of the members of the emitted class are marked as special by the compiler, and the runtime actually provides the implementations so that it can (more or less) optimally dispatch the delegated function.

Summary

Having added the delegate, we have two types called DocumentProcess, which is not going to work. Let s get rid of our old DocumentProcess abstract base class, and the three

classes we derived from it. Isn t it satisfying, getting rid of code There is less to test and you are statistically likely to have fewer bugs. So how are we going to adapt our DocumentProcessor to use our new definition for the DocumentProcess type Take a look at Example 5-9.

class DocumentProcessor { private readonly List<DocumentProcess> processes = new List<DocumentProcess>(); public List<DocumentProcess> Processes { get { return processes; } } public void Process(Document doc) { foreach(DocumentProcess process in Processes) { // Hmmm... this doesn't work anymore process.Process(doc); } }

This information includes the amount of power that the various circuits are using, and how long the smart card takes to conduct certain computations With this information, the attacker might be able to construct a power attack to extract bits of the key Even with the limitations that smart cards have, they provide a better alternative to storing secrets than source code, files, or the Windows registry While they are not perfect, smart cards do raise the bar of effort required on the part of the attacker to steal stored secrets..

}

We re still storing a set of DocumentProcess objects, but those objects are now delegates to member functions that conform to the signature specified by the DocumentProcess delegate. We can still iterate over the process collection, but we no longer have a Process method on the object. The equivalent function on the delegate type is a method called Invoke which matches the signature of our delegated function:

process.Invoke(doc);

While this works just fine, it is such a common thing to need to do with a delegate that C# lets us dispense with .Invoke entirely and treat the delegate as though it really was the function to which it delegates:

Storing Secrets on a Hardware Security Module (HSM)

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