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abstract class FirefighterBase : INamedPerson, ISalariedPerson { public string Name { get; set; } public decimal Salary { get; set; } } // ...

Notice that we can happily implement the setter on our FirefighterBase, even though the interface only requires a getter. The restrictions on how you implement the interface as long as you conform to the contract it specifies are much looser than those on overrides of a base class. Also, C# doesn t allow you to use the simple property syntax to define virtual properties or their overrides, but there is no such restriction when you re implementing an interface. So we ve been able to use simple property syntax here rather than having to implement using full-blown properties. We can now make use of this interface in our FireStation class. Instead of a list of objects, we can use a list of INamedPerson, and call on the Name property in our RollCall method, as shown in Example 4-23.

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On Windows, the CryptGenKey() OS library call can be used to securely generate keys. In Java, you can use the SecureRandom class in the java.security package that we introduced in 9 to generate random numbers. Depending upon what OS your Java program is running on, the SecureRandom class may make underlying calls to CryptGenRandom or /dev/random, or make some other underlying OS library call. SecureRandom does not offer guarantees on how random the returned bits will be. Yet, using SecureRandom is a much better option than using the Random class that exists within the java.util package, for the same reason that rand() in C is not a good option java.util. Random can be used to generate statistically random, but not cryptographically secure, random numbers. The reason that the SecureRandom class does not offer guarantees about the level of entropy of random numbers it returns is because it is cross-platform; it may use different mechanisms on different OSs. The SecureRandom class will do its best to take advantage of whatever OS-level primitives are available to it on the given system that it is running on in order to generate random numbers. Yet, if the underlying OS does not have a good source of randomness, then neither will the returned values from SecureRandom. Nevertheless, SecureRandom is preferable to java.util.Random.

class FireStation { List<INamedPerson> clockedInStaff = new List<INamedPerson>(); public void ClockIn(INamedPerson staffMember) { if (!clockedInStaff.Contains(staffMember)) { clockedInStaff.Add(staffMember); Console.WriteLine("Clocked in {0}", staffMember.Name); } } public void RollCall() { foreach (INamedPerson staffMember in clockedInStaff) { Console.WriteLine(staffMember.Name);

}

}

}

If you ve been following through the code in Visual Studio (which I thoroughly recommend), you ll also need to change your object initializers back to this form:

Keys are a type of a secret that may need to be stored for later use. For instance, once you generate a public/private key pair for a user, the private key needs to be stored in a confidential manner such that the user (and no one else) can decrypt messages with that private key. More generally, a secret could mean a cryptographic key, a password, or any piece of information that the security of your program depends on. As Kerckhoff s principle states, the security of one s program should not depend upon the secrecy (obscurity) of the algorithm itself, but should instead depend upon the secrecy of cryptographic keys. In this section, we talk about some options for storing secrets such as cryptographic keys and passwords.

Firefighter joe = new Firefighter { Name = "Joe" };

If we compile and run, we get the output we hoped for a roll call of everyone in the station:

Clocked in Joe Clocked in Bill Clocked in Harry Clocked in Mr Arthur Askey Joe Bill Harry Mr Arthur Askey

The SDK object componentManager uses these parameters to load the block into the test harness. You can see if your block has been loaded by looking below the text box when the test harness is running (see Figure 8-24).

Interfaces support inheritance too, just like classes. If you want, you could create a named, salaried person interface like this:

Consider a scenario in which you are writing a program that needs to store a file on disk such that no other program can read that file. Your program might need to use a key to encrypt the bits of that file. Yet, the question arises, where exactly should you store the key There are a number of options that are available.

interface INamedSalariedPerson : INamedPerson, ISalariedPerson { }

What happens if you have conflicting names Imagine the interface ISettable NamedPerson:

interface ISettableNamedPerson { string Name { get; set; } }

abstract class FirefighterBase : INamedPerson, ISettableNamedPerson, ISalariedPerson { // ... }

The answer is that everything is just fine! Each interface requires that we implement a string property called Name; one requires at least a getter, the other a getter and a setter.

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