Testing and Opening an SSL Connection in Microsoft Word

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Testing and Opening an SSL Connection
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In this brief walkthrough, you will test if you can establish a secure connection to a remote server (PayPal), and then you will write a small Windows Phone 7 application that programmatically loads secure content from the PayPal web site. 1. The quickest way to test whether a connection to a secure web site can be established is to open up Internet Explorer on Windows Phone 7 Emulator or a Windows Phone 7 device and type the URL of a secure remote server. Launch Windows Phone 7 Emulator by clicking Start All Programs Windows Phone Developer Tools Windows Phone 7 Emulator. Once the emulator loads, click the Internet Explorer icon and type in https://www.paypal.com to go to the secure PayPal site. You should see the main screen of the PayPal web site.
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Tip It may get quite tiresome having to click all of the keyboard buttons on the emulator. To enable the use of computer keyboard in the emulator window, you can press the PgUp key once the emulator loads up. To discontinue using the keyboard in the emulator, press the PgDn key.
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Now, you will create a small Windows Phone 7 application that will access the PayPal site via a secure connection. You could access any secure remote service in a similar manner, but only if that service has a certificate issued by a CA that Windows Phone 7 device trusts. In the next section of this chapter, you will go through creating, exporting, and installing the self-signed certificates, which is a bit more complicated. As usual, launch Visual Studio 2010 Express for Windows Phone and create a new Windows Phone 7 Application project. Name that project SSLConnection and click OK. MainPage.xaml is presented in the Designer.
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CHAPTER 19 SECURITY
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From the toolbox, drag and drop the WebBrowser control onto the design surface. Make the width and height of that control to be the full width and height of available design surface on MainPage.xaml. Switch to code view (right-click MainPage.xaml and select View Code) and add the following code to the MainPage() constructor. This code will create a WebClient object, register the callback function for that object (you will write in in the next section), and create a request to retrieve the contents of paypal.com securely. WebClient client = new WebClient(); client.OpenReadCompleted += new OpenReadCompletedEventHandler(HandleResponse); client.OpenReadAsync(new Uri("https://www.paypal.com"));
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Write the HandleResponse callback function for the request. This function will display the contents of whatever was returned as a result of the previous request to https://www.paypal.com.
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void HandleResponse(object sender, OpenReadCompletedEventArgs e) { StreamReader reader = new StreamReader(e.Result); string res = reader.ReadToEnd(); webBrowser1.NavigateToString(res); } 7. Press F5 to run the application. You should see the PayPal page displayed in the web browser window.
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As you can see from the previous example, establishing a secure connection to the remote service is fairly straightforward if a remote service has a certificate issued by a major CA with whom Windows Phone 7 has an existing trust relationship. Just remember to use Apress Standard Book Blank.doc instead of Apress Standard Book Blank.doc when accessing a remote web service securely. But certificates issued by a major certification authority can be expensive, and may not be necessary if all users of remote service trust that the service is legitimate. In addition, you may want to experiment or test your secure service without spending a lot of money on the certificates. Self-signed SSL certificates offer the same degree of data protection in transit (data is encrypted using SSL), without the expense of using the certification authority. There is a slight administrative overhead in issuing and installing those certificates, but you will easily tackle it in a few steps in the next walkthrough. There are three steps to enabling the use of self-signed certificates on Windows Phone 7 device: first, you have to create a self-signed certificate; second, you have to export that certificate for installation on the mobile device; and third, you have to install that certificate on the Windows Phone 7 device. Creating and exporting the self-signed certificate steps occur on the server where the secure service resides. Installing the certificate, of course, happens on each device that will need to establish a secure connection to the service using a self-signed certificate.
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