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Now we re ready to look at another important piece for connecting Spring services to the user interface BlazeDS, a technology for remotely connecting to Java objects and for sending messages between clients. As Adobe points out, BlazeDS allows you to connect to back-end distributed data and push data in real time to Adobe Flex and Adobe AIR rich Internet applications (RIA). You can think of Blaze as a bridge between Adobe Flex (the presentation layer) and Java Spring Services (the business logic layer), as shown in Figure 1-3. Figure 1-4 outlines the BlazeDS server architecture.

Figure 25-6. Ready to view metadata using MEX Your host now exposes two different endpoints (one for the service and one for MEX), so your host s console output will appear like this: ***** Console Based WCF Host ***** ***** Host Info ***** Address: http://localhost:8080/MagicEightBallService Binding: BasicHttpBinding Contract: IEightBall Address: http://localhost:8080/MagicEightBallService/mex Binding: MetadataExchangeHttpBinding Contract: IMetadataExchange ********************** The service is ready.

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Now you can create a Web page for testing the class you created previously. Just create a page that allows you to generate a key and enter clear-text data through a text box. You can output the encrypted data through Convert.ToBase64String() easily. For decryption, you just need to revert the operation through Convert.FromBase64String() to get the encrypted bytes back and pass them into the DecryptData method. Dim KeyFileName As String Dim AlgorithmName As String = "DES" Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) SymmetricEncryptionUtility.AlgorithmName = AlgorithmName KeyFileName = Server.MapPath("~/") & "\symmetric_key.config" End Sub Protected Sub GenerateKeyCommand_Click(ByVal sender As Object, ByVal e As EventArgs) SymmetricEncryptionUtility.ProtectKey = EncryptKeyCheck.Checked SymmetricEncryptionUtility.GenerateKey(KeyFileName) Response.Write("Key generated successfully!") End Sub Protected Sub EncryptCommand_Click(ByVal sender As Object, ByVal e As EventArgs) ' Check for encryption key If (Not File.Exists(KeyFileName)) Then Response.Write("Missing encryption key. Please generate key!") End If Dim data As Byte() = SymmetricEncryptionUtility.EncryptData(ClearDataText.Text, KeyFileName) EncryptedDataText.Text = Convert.ToBase64String(data) End Sub Protected Sub DecryptCommand_Click(ByVal sender As Object, ByVal e As EventArgs) ' Check for encryption key If (Not File.Exists(KeyFileName)) Then Response.Write("Missing encryption key. Please generate key!") End If Dim data As Byte() = Convert.FromBase64String(EncryptedDataText.Text)

Source Code You can find the MagicEightBallServiceHost project under the MagicEightBallServiceHTTP directory of 25.

ClearDataText.Text = SymmetricEncryptionUtility.DecryptData(data, KeyFileName) End Sub The previous page uses the DES algorithm because you set the AlgorithmName of your utility class appropriately. Within the Click event of the GenerateKeyCommand button, it calls the GenerateKey() method. Depending on the check box of the page, it encrypts the key itself through the DPAPI or not. After the data has been encrypted through your utility class within the Click event of the EncryptCommand button, it converts the encrypted bytes to a Base64 string and then writes it to the EncryptedDataText text box. Therefore, if you want to decrypt information again, you have to create a byte array based on this Base64 string representation and then call the method for decryption. You can see the result in Figure 25-6.

Now that your host is in place, the final task is to build a piece of software to communicate with this WCF service type. While you could take the long road and build the necessary infrastructure by hand (a feasible, but labor-intensive task), the .NET Framework 4.0 SDK provides several approaches to generate a client-side proxy quickly. Begin by creating a new Console Application named MagicEightBallServiceClient.

Using asymmetric algorithms is similar to using symmetric algorithms. You will see just a handful of differences. The major difference has to do with key management. Symmetric algorithms just have one key, and asymmetric algorithms have two keys: one for encrypting data (public key) and one for decrypting data (private key). While the public key can be available to everyone who wants to encrypt data, the private key should be available only to those decrypting information. In this section, you will create a utility class similar to the previous one. Because the .NET Framework ships with only one asymmetric algorithm for real data encryption (RSA; remember, DSA is used for digital signatures only), you don t need to include a way to select the algorithm (for a while). Public Class AsymmetricEncryptionUtility Private Sub New()

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