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fsWrite(Key, 0, KeyLength) End Using End Sub The GenerateKey() method of the SymmetricAlgorithm class generates a new key through cryptographically strong random number algorithms and initializes the Key property with this new key If configured appropriately, it encrypts the key using the DPAPI The ReadKey method reads the key from the file created by the GenerateKey method, as follows: Public Shared Sub ReadKey(ByVal algorithm As SymmetricAlgorithm, ByVal keyFile As String) Dim Key As Byte() Using fs As New FileStream(keyFile, FileModeOpen) Key = New Byte(fsLength - 1) {} fsRead(Key, 0, CInt(fsLength)) End Using If ProtectKey Then algorithmKey = ProtectedDataUnprotect(Key, Nothing, DataProtectionScopeLocalMachine) Else algorithmKey = Key End If End Sub If the key was protected previously, the ReadKey method uses the DPAPI for unprotecting the encrypted key when reading it from the file.

Table 25-9. Sub-elements of <service.serviceModel> (continued)

This element contains settings for the diagnostic features of WCF. The user can enable/disable tracing, performance counters, and the WMI provider; the user can also add custom message filters. This element contains a collection of WCF services exposed by the host.

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The method furthermore requires passing in an existing instance of a symmetric algorithm It directly initializes the key property of the algorithm so that this key will be used automatically for all subsequent operations The function itself is used by both the EncryptData and DecryptData functions Public Shared Function EncryptData(ByVal data As String, ByVal keyFile As String) As Byte() End Function Public Shared Function DecryptData(ByVal data As Byte(), ByVal keyFile As String) As String End Function As you can see, both methods require a keyFile parameter with the path to the file that stores the key They subsequently call the ReadKey method for initializing their algorithm instance with the key While the EncryptData method accepts a string and returns a byte array with the encrypted representation, the DecryptData accepts the encrypted byte array and returns the clear-text string.

Recall that WCF client applications communicate with the WCF service through an intervening proxy type While you could author the proxy code completely by hand, doing so would be tedious and errorprone Ideally, you could use a tool to generate the necessary grunge code (including the client-side *config file) Thankfully, the NET Framework 40 SDK provides a command-line tool (svcutilexe) for this purpose Also, Visual Studio 2010 provides similar functionality through its Project Add Service Reference menu option For these tools to generate the necessary proxy code/*config file, however, they must be able to discover the format of the WCF service interfaces and any defined data contracts (eg, the method names and type of parameters) Metadata exchange (MEX) is a WCF service behavior that you can use to fine-tune how the WCF runtime handles your service.

Let s get started with the EncryptData method: Public Shared Function EncryptData(ByVal data As String, ByVal keyFile As String) As Byte() ' Convert string data to byte array Dim ClearData As Byte() = EncodingUTF8GetBytes(data) ' Now create the algorithm Dim Algorithm As SymmetricAlgorithm = SymmetricAlgorithmCreate(AlgorithmName) ReadKey(Algorithm, keyFile).

Simply put, each <behavior> element can define a set of activities a given service can subscribe to WCF provides numerous behaviors out of the box, and it is possible to build your own The MEX behavior (which is disabled by default) will intercept any metadata requests sent through HTTP GET You must enable MEX if you want to allow svcutilexe or Visual Studio 2010 to automate the creation of the required client-side proxy *config file Enabling MEX is a matter of tweaking the host s *config file with the proper settings (or authoring the corresponding C# code) First, you must add a new <endpoint> just for MEX Second, you need to define a WCF behavior to allow HTTP GET access Third, you need to associate this behavior by name to your service using the behaviorConfiguration attribute on the opening <service> element.

A key advantage of Hibernate from my point of view is its integration with Spring. In fact, Spring provides a Hibernate Template that simplifies the use of Hibernate. The Hibernate Template provides convenience methods that enable the developer to write less code, as you can see from the following:. public v oid remove(User user) { getHibernateTemplate().delete(user); } Hibernate also provides hooks so Spring can manage sessions and transactions in a transparent and elegant way.

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