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The GtkColorButton widget provides a simple way for you to allow your users to select a specific color. These colors can be specified as six-digit hexadecimal values or the RGB value. The color button itself displays the selected color in a rectangular block set as the child widget of the button. An example of this can be viewed in Figure 4-9.

routes.MapRoute("catalog", "{action}", new{controller="Catalog"}, new{action=@"basket|checkout"});

When clicked, the color button opens a dialog that allows the user to enter in the color value or browse for a choice on the color wheel. The color wheel is provided so the user is not required to know the numeric values of the colors. Listing 4-9 shows how to use the GtkColorButton widget in an application. Listing 4-9. Color Buttons and GdkColors (colorbuttons.c) #include <gtk/gtk.h> static void color_changed (GtkColorButton*, GtkWidget*); int main (int argc, char *argv[]) { GtkWidget *window, *button, *label, *hbox; GdkColor color; gtk_init (&argc, &argv);

When used incorrectly, they can give rise to dangerous security holes, and give a false perception of security simply because cryptography is being used (albeit incorrectly) As such, before using cryptographic primitives, we strongly recommend that you consult a security expert to review your design and your code The design review can help ensure that you are accomplishing your intended goals by using cryptography, and the code review can help identify vulnerabilities in your implementation of the design If you are interested in using cryptographic primitives, you should consider using one of many existing cryptographic libraries; do not attempt to build your own! In the next few chapters, we will discuss important cryptographic concepts and popular ciphers You should keep in mind that cryptography is often a small (but critical) part of an overall software security solution.

We ve now added static and dynamic routes to serve up content for various URLs in our site. What happens if a request comes in that doesn t match any requests In this event, an exception is thrown, which is hardly what you d want in a real application. To handle this, we use catchall routes.

window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Color Button"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); /* Set the initial color as #003366 and set the dialog title. */ gdk_color_parse ("#003366", &color); button = gtk_color_button_new_with_color (&color); gtk_color_button_set_title (GTK_COLOR_BUTTON (button), "Select a Color"); label = gtk_label_new ("Look at my color!"); gtk_widget_modify_fg (label, GTK_STATE_NORMAL, &color); g_signal_connect (G_OBJECT (button), "color_set", G_CALLBACK (color_changed), (gpointer) label); hbox = gtk_hbox_new (FALSE, 5); gtk_box_pack_start_defaults (GTK_BOX (hbox), button); gtk_box_pack_start_defaults (GTK_BOX (hbox), label); gtk_container_add (GTK_CONTAINER (window), hbox); gtk_widget_show_all (window); gtk_main (); return 0; } /* Retrieve the selected color and set it as the GtkLabel's foreground color. */ static void color_changed (GtkColorButton *button, GtkWidget *label) { GdkColor color; gtk_color_button_get_color (button, &color); gtk_widget_modify_fg (label, GTK_STATE_NORMAL, &color); } In most cases, you will want to create a GtkColorButton with an initial color value, which is done by specifying a GdkColor object to gtk_color_button_new_with_color(). The default color, if none is provided, is opaque black with the alpha option disabled.

16.3.4 Catchall routes The final route we ll add to the sample application is a catchall route to match any URL not yet matched by another rule. The purpose of this route is to display our HTTP 404 error message. Global catchall routes, like the one in listing 16.8, will catch anything, and as such should be the last route defined.

Cryptography on its own cannot be used to achieve security goals, but it is an important component Careful use of cryptography in applications, together with well-designed and correctly deployed software, good policies and procedures, and physical security, can result in real security We divide our study of applied cryptography into two general areas: low-level primitives and higher-level protocols Our discussion of low-level primitives includes cryptographic algorithms that serve as building blocks These building blocks can be put together to implement higher-level protocols, such as digital signature generation and verification A digital signature is a sequence of bits that can feasibly be constructed only by a principal that has a secret signing key We will discuss digital signatures in more detail once we have covered low-level primitives in this chapter and the next This chapter focuses on symmetric encryption in which Alice and Bob use the same key.