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By inheriting from ViewPage<T> instead of ViewPage, we now have a strongly typed view. In the next section, we ll look at how we can use our view model object to display information in a view.

glong (gulong)

Typically, to display information in a view, we ll use the HtmlHelper object to help us use our view model to generate HTML. Consider listing 3.8, where we render a collection of profiles.

s Caution In the following example, as well as some other examples presented in later chapters, the simple toy protocols that we discuss are for instructive and illustration purposes only. They are designed to make concepts easy to understand, and are vulnerable to various types of attacks that we do not necessarily describe. Do not implement these protocols as is in software.

gpointer gshort (gushort)

<th>Username</th> <th>First name</th> <th>Last name</th> <th>Email</th> <th> </th> Iterates over </tr> all profiles <% foreach (var profile in Model) { %> <tr> <td> <%= Html.Encode(profile.Username) %> Displays profile </td> information <td> <%= Html.Encode(profile.FirstName) %> </td> <td> <%= Html.Encode(profile.LastName) %> </td> <td> <%= Html.Encode(profile.Email) %> </td> <td> <%= Html.ActionLink("View Profile", "Show", new{username = profile.Username}) %> </td> </tr> <% } %> </table>

gsize (gssize)

Let s consider a scenario in which Bob has a public/private key pair, and Alice wants to authenticate Bob. Assuming that Alice received Bob s public key certificate and trusts that, say, Kp, is indeed Bob's public key, she can encrypt a challenge message using Bob s public key (see Figure 13-1).

In our profile list screen, we want to iterate over the profiles passed in our model B and display select information from each C. Because we d rather not open ourselves to the myriad of scripting attacks possible when displaying unencoded user input to the screen, we encode all user-entered information by using the Encode method on HtmlHelper, which is exposed through the Html property on our base ViewPage<T> (and ViewPage) class. In our login page, we use a view model object to represent the entire form, as shown in listing 3.9.

You used to be able to check whether gint64 and guint64 were supported on the platform by using the G_HAVE_GINT64 macro. However, since the release of GLib 2.0, 64-bit integers have been required, so this macro is always defined, as well as both data types. These two types have the following definitions: G_GNUC_EXTENSION typedef signed long long gint64; G_GNUC_EXTENSION typedef unsigned long long guint64;

public class LogOnModel { [Required] [DisplayName("User name")] public string UserName { get; set; } [Required] [DataType(DataType.Password)] [DisplayName("Password")] public string Password { get; set; } public bool RememberMe { get; set; } }

Note Some options such as -pedantic cause warnings for extensions in GNU C. Typing __extension__

Figure 13-1. Authentication with encryption The challenge message contains a nonce (some random number) in it. In Figure 13-1, Alice encrypted the number 384764342 with Bob s public key and sent the nonce to Bob. Bob can use his private key to decrypt the message to retrieve the plain text 384764342, and send it back to Alice. Since Bob is the only person who can decrypt this message with his private key, Alice can be satisfied that she is communicating with Bob if he can respond with the nonce that she encrypted with his public key. An impostor such as Mallory would not possess Bob s private key and would not be able to decrypt the challenge. Obviously, Alice should send a different, unpredictable nonce each time, or else Mallory may be able to replay a message that Bob previously decrypted to impersonate him. In this example, we have used public key encryption to achieve authentication. Encryption can also be used to implement digital signatures and message integrity, among other things. In 15, we show how encryption can be used to implement digital signature schemes and message authentication codes.

The LogOnModel class is simple, containing only auto properties. The attributes B you see here are data annotations, and you ll learn more about them in chapter 4. The logon screen shows input elements for each of these properties, as you can see in figure 3.2.

before the expression can prevent this. G_GNUC_EXTENSION is equivalent to __extension__.