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System::Configuration::Configuration^ config = ConfigurationManager::OpenExeConfiguration(exePath); ConfigurationSection^ section = config->GetSection(sectionName); if (!section->SectionInformation->IsProtected) { section->SectionInformation->ProtectSection(Provider); section->SectionInformation->ForceSave = true; config->Save(); } } int main(array<System::String ^> ^args) { String^ EncryptProvider = "RsaProtectedConfigurationProvider"; // String^ EncryptProvider = "DataProtectionConfigurationProvider"; EncryptConfigurationSection("appSettings", EncryptProvider); return 0; } The first thing to notice is the IsProtected property. As you might expect, it returns true if the section has already been protected that is, encrypted: if (!section->SectionInformation->IsProtected) When this returns false, we continue into the if statement and then execute the ProtectSection() method on the section you want encrypted: section->SectionInformation->ProtectSection(Protection_Provider); That s it. You have seen everything else in this code except for the two protection providers provided by the .NET Framework: RSAProtectedConfigurationProvider class DpapiProtectedConfigurationProvider class

You need to pass the protect provider name of DataProtectionConfigurationProvider instead of DpapiProtectedConfigurationProvider to the ProtectSection() method. Go figure.

changes in each window (using the Next Change and the Previous Change buttons in the lower right).

Both providers offer strong encryption of data. However, if you plan on using the same encrypted .config file on multiple servers, only the RSAProtectedConfigurationProvider has the ability to export encryption keys that can be later imported on a different server. Exporting and importing encryption keys is pretty painless. To export, you run the following command on the machine where you encrypted the .config file: aspnet_regiis -px "NetFrameworkConfigurationKey" keys.xml pri

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That's all! Add this to Dudel-Info.plist, and build and run that on your iPad. Now, while your iPad is still connected to your computer, go into iTunes on your computer, select your iPad in the navigation area on the left, and then click the Apps tab to bring it forward. You'll see all the installed apps as usual, but with one new twist: a new File Sharing section at the bottom of the window's content area. This section shows all the apps that have sharable document content, and Dudel is there! Select Dudel, and you can see everything in our Documents directory, as shown in Figure 10 3. You can drag files out to the Finder to save them on your computer, and you can drag other files from your computer back in. You'll see whatever documents you've created in Dudel, and perhaps also a subdirectory called Inbox. (The Inbox directory is the place where the system puts files temporarily when your app is asked to open them. You should probably just leave it alone.)

Then import the generated key.xml file on all the servers where you want to use the .config file with the following command: aspnet_regiis -pi "NetFrameworkConfigurationKey" keys.xml There is one last issue I need to cover, which only has an impact on Windows Vista users. Due to its (overly ) heightened security features, you need to run the encryption application as an administrator. If you don t, you will be blasted with an ugly message like this: Unhandled Exception: System.Configuration.ConfigurationErrorsException: An error occurred executing the configuration section handler for appSettings. ---> System.Configuration.ConfigurationErrorsException: Failed to encrypt the section 'appSettings' using provider 'RsaProtectedConfigurationProvider'. Error message from the provider: Object already exists. ---> System.Security.Cryptography.CryptographicException: Object already exists. Figure 9-6 shows before and after dumps of the .config file when encrypted using RSAProtectedConfigurationProvider.

The exclamation mark tells you there is an unresolved conflict. Checking the Navigate conflicts only check box in the lower left corner of the dialog allows you to move between items that VSTS cannot figure out on its own. The only actual conflict that exists in the file is the boxed area (in the lower window) on line 10. The changes made in one file or another, but not both, are resolved automatically.

Figure 9-6. RSAProtectedConfigurationProvider before and after encryption Figure 9-7 shows before and after dumps of the .config file when encrypted using DpapiProtectedConfigurationProvider.

Note If Auto Merge was selected, this dialog box would still have been displayed because VSTS cannot

The first thing you should be aware of is that you don t need to decrypt the .config file for your application to work. That is all done for you, as long as you have the appropriate keys on the machine running the application using the encrypted .config file. The decryption process simply converts the .config file to its original form, presumably so that it can be edited before encrypting it again. Like the encryption section earlier, I m just going to throw the code of Listing 9-7 at you, as there is nothing special in it. Listing 9-7. Decrypting a Configuration Section using namespace System; using namespace System::Configuration; void DecryptConfigurationSection(String^ sectionName) { String^ tmpPath = Reflection::Assembly::GetExecutingAssembly()->Location; String^ exePath = Path::GetDirectoryName(tmpPath) + "\\EncryptSection.exe"; System::Configuration::Configuration^ config = ConfigurationManager::OpenExeConfiguration(exePath); ConfigurationSection^ section = config->GetSection(sectionName); if (section->SectionInformation->IsProtected) { section->SectionInformation->UnprotectSection(); section->SectionInformation->ForceSave = true; config->Save(); } }

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