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Tool1 has seen Tool2 has seen The processing (Document 1) Too11 has seen Tool2 has seen processing. processing. will not succeed. that processing is complete. that processing is complete.

Document traduit. (Document 2) Spellchecked document. (Document 2) Repaginated document. (Document 2) Highlighting 'millennium' (Document 2) Too11 has seen that processing is complete. Tool2 has seen that processing is complete. Tool1 has seen processing. Tool2 has seen processing. Document traduit. (Document 3) Spellchecked document. (Document 3) Repaginated document. (Document 3) (Document 3) Too11 has seen that processing is complete. Tool2 has seen that processing is complete. Executed 9 processes.

You might notice that the event handlers have been executed in the order in which we added them. This is not guaranteed to be the case, and you cannot depend on this behavior. If you need deterministic ordering (as we did for our processes, for example) you should not use an event.

Earlier, I alluded to the fact that we can customize the data we send through with the event. We do this by deriving our own class from EventArgs, and adding extra properties or methods to it. Let s say we want to send the current document through in the event; we can create a class like the one shown in Example 5-24.

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class ProcessEventArgs : EventArgs { // Handy constructor public ProcessEventArgs(Document document) { Document = document; } // // // // // // The extra property We don't want subscribers to be able to update this property, so we make it private (Of course, this doesn't prevent them from changing the Document itself)

As mentioned in Section 14.1, don t forget to use different keys for encryption and MACs. For instance, if the same key that is used for AES CBC encryption is also used to compute an AES CBC MAC, an adversary would be able to modify an entire message up to the last block without detection. It would be advisable to call in a security expert for help and advice prior to deciding which MAC algorithms to use, and to have your code reviewed to make sure you are not doing anything dangerous.

Drag the RSS block onto the block building space. After a brief animation, the block appears, and you can drag and drop the block anywhere on the visible canvas. To get more space to work, you can minimize the icon in the upper-left corner of the block window. Hover the mouse over the block on the design surface to see the default operation the block can perform and the default parameters of the operation (see Figure 3-4).

}

public Document Document { get; private set; }

We also need to create a suitable delegate for the event, one that takes a ProcessEven tArgs as its second parameter rather than the EventArgs base class. We could do this by hand, sticking to the convention of calling the first parameter sender and the data parameter e:

delegate void ProcessEventHandler(object sender, ProcessEventArgs e);

We now describe an alternate MAC algorithm called HMAC. Instead of attempting to build a MAC based on a block cipher, HMAC uses a secure hash function to compute a MAC. The security of HMAC is dependent upon the strength of the underlying secure hash function that is used. One key difference between a secure hash function and a MAC is that a secure hash function takes a message as input, whereas a MAC takes a message and a secret key as input. To construct a MAC from a secure hash function, you might imagine that you could feed both a key and a message into a hash function as input. However, due to the way that hash functions work internally, if you were to simply prepend a secret key k onto message M, and use H(k||M) as a MAC, an attacker would be able to easily compute a MAC for another message, M' = M||N (where N is of the attacker s choice), without knowing the key! If M ended with a dollar amount, such as $10, then the attacker could set N to be a couple extra zeros, and produce M' with a matching tag. The HMAC construction is a bit more involved than just prepending the secret key to the message and hashing. The HMAC construction is as follows:

Once again, this is such a common thing to need that the framework provides us with a generic type, EventHandler<T>, to save us the boilerplate code. So we can replace the ProcessEventHandler with an EventHandler<ProcessEventArgs>. Let s update our event declarations (see Example 5-25).

public event EventHandler<ProcessEventArgs> Processing; public event EventHandler<ProcessEventArgs> Processed;

and then our helper methods which raise the event that will need to take a ProcessE ventArgs (see Example 5-26).

private void OnProcessing(ProcessEventArgs e) { if (Processing != null) { Processing(this, e); } } private void OnProcessed(ProcessEventArgs e) { if (Processed != null) { Processed(this, e); } }

And finally, our calls to those methods will need to create an appropriate ProcessEven tArgs object, as shown in Example 5-27.

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