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In the dialog s center, select the Console Application template. This creates an oldfashioned command-line application that runs in a console window. It might not be the most exciting kind of program, but it s the easiest to create and understand, so that s where we ll start. You need to pick a name for your program by default, Visual Studio will suggest something unimaginative such as ConsoleApplication1. In the Name field near the bottom of the dialog, type HelloWorld. (OK, so that s equally unimaginative, but at least it s descriptive.) Visual Studio also wants to know where you d like to put the project on your hard disk put it wherever you like. It can also create a separate solution directory. That s something you d do in a larger program made up of multiple components, but for this simple example, you want the Create directory for solution checkbox to be unchecked. When you click the OK button, Visual Studio will create a new project, a collection of files that are used to build a program. C# projects always contain source code files, but they often include other types of files, such as bitmaps. This newly created project will contain a C# source file called Program.cs, which should be visible in Visual Studio s text editor. In case you re not following along in Visual Studio as you read this, the code is reproduced in Example 2-1. By the way, there s no particular significance to the filename Program.cs. Visual Studio doesn t care what you call your source files; by convention, they have a .cs extension, short for C#, although even that s optional.

using using using using System; System.Collections.Generic; System.Linq; System.Text;

namespace HelloWorld { class Program { static void Main(string[] args) { } } }

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In addition, you should eliminate keys from memory immediately after using them, as process memory may periodically get paged or swapped to disk by the virtual memory subsystem of your operating system If, for instance, your application uses a dialog box to ask a user for a password, be sure to zero out and free the memory objects used to construct that dialog box after you have received the password In fact, one way to attack a system and steal passwords and keys is to cause it to core dump and then look through the swap file for passwords and keys! Finally, it is often desirable to generate a key from a password However, as we demonstrated in 9, passwords (and hence keys generated from them) can be susceptible to dictionary attacks The number of possible 128-bit keys is significantly larger than, say, the number of 8-character alphanumeric passwords.

This program doesn t do anything yet. To turn it into the traditional first example, you ll need to add one line of code. This will go in between the two lines that contain the most-indented pair of braces ({ and }). The modified version is shown in Example 2-2, with the new line in bold.

using using using using System; System.Collections.Generic; System.Linq; System.Text;

The first line of code is the most important in relation to using the block test harness to test your blocks. A call is made to an object called componentManager:

namespace HelloWorld { class Program { static void Main(string[] args) { Console.WriteLine("Hello, world"); } } }

This example is now ready to run. From the Debug menu select the Start Without Debugging item, or just press Ctrl-F5. The program will run, and because you ve written a console application, a console window will open. The first line of this window will contain the text Hello, world and this will be followed by a prompt saying Press any key to continue... Once you ve finished admiring the fruits of your creation, press a key to dismiss the window.

Don t use Debug Start Debugging or F5 this will run the application in Visual Studio s debugging mode, which doesn t keep the window open once the application has finished. That s not helpful for this example, which will most likely run to completion and then close the window before you ve had a chance to see the output.

As such, if you need to generate a cryptographic key from a password, you should use a password-based encryption scheme such as PKCS #5, as specified in RFC 2898 (see wwwietforg/rfc/rfc2898txt) In the most basic PKCS #5 scheme, passwords are salted and then hashed many times (eg, 1,000 times) to make dictionary attacks harder Of course, you should not implement password-based encryption schemes yourself, but instead use already implemented ones as provided by, for instance, the PBEKeySpec and PBEParameterSpec classes in the Java Cryptography Extension (JCE)..

Now that we have a complete program, let s look at the code to see what each part is for all of the pieces are things you ll deal with every time you write in C#. Starting from the top, Program.cs has several lines beginning with using:

using using using using System; System.Collections.Generic; System.Linq; System.Text;

These using directives help the C# compiler work out what external code this particular source file will be using. No code is an island to get any useful work done, your programs will rely on other code. All C# programs depend on the .NET Framework class library, for example: the one line of code we added to our program uses the class library to display a message. Using directives can declare an intent to use classes from any library yours, Microsoft s, or anyone s. All the directives in our example start with System, which indicates that we want to use something from the .NET Framework. This text that follows the using keyword denotes a namespace.

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