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RC4 is a very popular stream cipher that approximates a one-time pad. Since it is impractical to have a key that is as long as the plaintext itself, RC4 uses a fixed-size key as a seed that is used to generate an infinite stream of key bits. Before we cover RC4 in more detail, we first review modular arithmetic, since it is used in the implementation of RC4. You have probably seen modular arithmetic at some point. To review, the modulus of two operands X and Y is the remainder when X is divided by Y. For example, 10 mod 3 = 1, since the remainder of 10 / 3 is 1. The modulus operator can also be applied after any operator. For example, we could take various powers of a number and then apply the mod operator if g = 5, then g mod 3 = 2. To calculate g2 mod 3, we first calculate g2 = 25, and then calculate 25 mod 3 = 1. Similarly, g3 mod 3 = 2.

We can now use the object initializer syntax for all the properties we want to set. As Example 3-37 shows, this makes our code look somewhat neater we only need one style of code to initialize the object.

Plane someBoeing777 = new Plane { Identifier = "BA0049", Direction = DirectionOfApproach.Approaching, SpeedInMilesPerHour = 150 };

Tester.sln, Tester.csproj, and Web.config. These files are used by the tool that I will introduce in the next section.

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Object initializer syntax provides one big advantage over offering lots of specialized constructors: people using your class can provide any combination of properties they want. They might decide to set the Position property inline in this object initializer too, as Example 3-38 does if we d been relying on constructors, default or named arguments wouldn t have helped if there was no constructor available that accepted a Position. We ve not had to provide an additional constructor overload to make this possible developers using our class have a great deal of flexibility. Of course, this approach only makes sense if our type is able to work sensibly with default values for the properties in question. If you absolutely need certain values to be provided on initialization, you re better off with constructors.

Plane someBoeing777 = new Plane { Identifier = "BA0049", Direction = DirectionOfApproach.Approaching, SpeedInMilesPerHour = 150, Position = new PolarPoint3D(20, 180, 14500) };

RC4 is the most widely used stream cipher (at the time at which this book was written). It is approximately ten times faster than DES.

So, we ve addressed the data part of our Plane; but the whole point of a class is that it can encapsulate both state and operations. What methods are we going to define in our class

When deciding what methods a class might need, we generally scan our specifications or scenarios for verbs that relate to the object of that class. If we look back at the ATC system description at the beginning of this chapter, we can see several plane-related actions, to do with granting permissions to land and permissions to take off. But do we need functions on the Plane class to deal with that Possibly not. It might be better to deal with that in another part of the model, to do with our ground control, runways, and runway management (that, you ll be pleased to hear, we won t be building). But we will periodically need to update the position of all the planes. This involves changing the state of the plane we will need to modify its Position. And it s a change of state whose details depend on the existing state we need to take the direction and

speed into account. This sounds like a good candidate for a method that the Plane class should offer. Example 3-39 shows the code to add inside the class.

public void UpdatePosition(double minutesToAdvance) { double hours = minutesToAdvance / 60.0; double milesMoved = SpeedInMilesPerHour * hours; double milesToTower = Position.Distance; if (Direction == DirectionOfApproach.Approaching) { milesToTower -= milesMoved; if (milesToTower < 0) { // We've arrived! milesToTower = 0; } } else { milesToTower += milesMoved; } PolarPoint3D newPosition = new PolarPoint3D( milesToTower, Position.Angle, Position.Altitude); }

This method takes a single argument, indicating how much elapsed time the calculation should take into account. It looks at the speed, the direction, and the current position, and uses this information to calculate the new position.

s Caution While we describe how RC4 works here, you should not try to implement it on your own. Use an

This code illustrates that our design is some way from being finished. We never change the altitude, which suggests that our planes are going to have a hard time reaching the ground. (Although since this code makes them stop moving when they get directly above the tower, they ll probably reach the ground soon enough...) Apparently our initial specification did not fully and accurately describe the problem our software should be solving. This will not come as astonishing news to anyone who has worked in the software industry. Clearly we need to talk to the client to get clarification, but let s implement what we can for now.

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