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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.

<%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %> <%@ Import Namespace="RssWidgetPortableArea"%> Imports helper <asp:Content ID="indexTitle" ContentPlaceHolderID="TitleContent" runat="server"> Home Page </asp:Content> <asp:Content ID="indexContent" ContentPlaceHolderID="MainContent" runat="server">

Lastly, depending on how your application handles messages, you may want to make other types of messages fatal. By default, only the G_LOG_LEVEL_ERROR flag will cause the application to be terminated. No matter what, this level is always fatal. To make another type of message fatal, you can call g_log_set_always_fatal(). This will associate the G_LOG_FLAG_FATAL flag with the specified level. g_log_set_always_fatal (G_LOG_LEVEL_DEBUG | G_LOG_LEVEL_WARNING); For example, the preceding example command will force the application to terminate when you report debugging and warning messages to the user. This feature should be used sparingly, because not all errors or warnings should cause the application to terminate!

RssWidget helper <% Html.RssWidget( "http://search.twitter.com/search.atom q=%23mvc2inaction"); %> </asp:Content>

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)..

Memory management is an extremely important aspect of any application and becomes increasingly significant as your application grows in size and complexity. While there are a large number of functions provided for memory management in GLib, this section will cover only those that are used most often.

The only line of code in the application that calls the portable area is the call to the RssWidget method B. After calling that method and running a simple view, the resulting web page is displayed in figure 22.4. The view merely references an RSS feed for Twitter messages containing MVC2InAction. The title and user will show up on the screen. The RssWidget HTML helper method that s used in the view is the syntactic sugar that makes consuming this portable area simple. If this method weren t made available, developers using the portable area would have to know some of the internals of how the area was constructed. For example, the RssWidget was intended to be used with the RenderAction method calling the RssWidgetController s Index method. To make that call, the area name registered in the area s registration is required, and in this case the area name is RssWidget. The implementation of the RssWidget helper is shown in listing 22.7.

Prior to GLib 2.10 memory allocators and memory chunks were used for the allocation of pieces of memory. However, a much more efficient method has been introduced in the current release in the form of memory slices. Therefore, memory slices are the only type of allocator that will be covered in this section. If you are using an older version of GLib for any reason, you should check out GMemChunk in the API documentation. The advantage of using memory slices is that they avoid excessive memory waste and fix scalability and performance problems that plagued memory chunks. This is achieved by using slab allocation. Memory slices very efficiently allocate memory as equally sized chunks. This means that they can be used to allocate individual objects as small as two pointers or many objects of the same size.