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POHow can I use encrypted xml file as application resources for xaml data binding?
 

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  1. POHow can I use encrypted xml file as application resources for xaml data binding?
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    <p>I want to use encrypted xml file as application resource for easy xaml data binding. Xml file are encrypted in different application. I can use unencrypted xml for data binding. I cant use the same method for encrypted xml because the file is encrypted when it is loaded. I have to decrypt it first before it can be use. Problem is, where do I put decryption algorithm?</p> <p>Here how i create the encrypted files(code for decrypt and verifying decrypted data are omitted)</p> <pre><code> RijndaelManaged algorithm = null; algorithm = new RijndaelManaged(); string passwordBytes = "password"; //password here byte[] saltBytes = Encoding.UTF8.GetBytes("salt"); // salt here (another string) var p = new Rfc2898DeriveBytes(passwordBytes, saltBytes); algorithm.IV = p.GetBytes(algorithm.BlockSize / 8); algorithm.Key = p.GetBytes(algorithm.KeySize / 8); var xmlDoc = new XmlDocument(); xmlDoc.PreserveWhitespace = true; xmlDoc.Load("Bands.xml"); // Encrypt the "Bands" element. Encrypt(xmlDoc, "Bands", algorithm); xmlDoc.Save("encryptedBands.xml"); </code></pre> <p>To decrypt, i just call these(assuming xmlDoc and algorithm are same as above.</p> <pre><code>Decrypt(xmlDoc, algorithm); </code></pre> <p>Here are encrypt and decrypt algorithm based on msdn(nothing special).</p> <pre><code> public static void Encrypt(XmlDocument Doc, string ElementName, SymmetricAlgorithm Key) { // Check the arguments. if (Doc == null) throw new ArgumentNullException("Doc"); if (ElementName == null) throw new ArgumentNullException("ElementToEncrypt"); if (Key == null) throw new ArgumentNullException("Alg"); var elementToEncrypt = Doc.GetElementsByTagName(ElementName)[0] as XmlElement; // Throw an XmlException if the element was not found. if (elementToEncrypt == null) { throw new XmlException("The specified element was not found"); } var eXml = new EncryptedXml(); byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, Key, false); var edElement = new EncryptedData(); edElement.Type = EncryptedXml.XmlEncElementUrl; string encryptionMethod = null; if (Key is TripleDES) { encryptionMethod = EncryptedXml.XmlEncTripleDESUrl; } else if (Key is DES) { encryptionMethod = EncryptedXml.XmlEncDESUrl; } if (Key is Rijndael) { switch (Key.KeySize) { case 128: encryptionMethod = EncryptedXml.XmlEncAES128Url; break; case 192: encryptionMethod = EncryptedXml.XmlEncAES192Url; break; case 256: encryptionMethod = EncryptedXml.XmlEncAES256Url; break; } } else { // Throw an exception if the transform is not in the previous categories throw new CryptographicException("The specified algorithm is not supported for XML Encryption."); } edElement.EncryptionMethod = new EncryptionMethod(encryptionMethod); // Add the encrypted element data to the // EncryptedData object. edElement.CipherData.CipherValue = encryptedElement; EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false); } public static void Decrypt(XmlDocument Doc, SymmetricAlgorithm Alg) { // Check the arguments. if (Doc == null) throw new ArgumentNullException("Doc"); if (Alg == null) throw new ArgumentNullException("Alg"); // Find the EncryptedData element in the XmlDocument. var encryptedElement = Doc.GetElementsByTagName("EncryptedData")[0] as XmlElement; // If the EncryptedData element was not found, throw an exception. if (encryptedElement == null) { throw new XmlException("The EncryptedData element was not found."); } // Create an EncryptedData object and populate it. var edElement = new EncryptedData(); edElement.LoadXml(encryptedElement); // Create a new EncryptedXml object. var exml = new EncryptedXml(); // Decrypt the element using the symmetric key. byte[] rgbOutput = exml.DecryptData(edElement, Alg); // Replace the encryptedData element with the plaintext XML element. exml.ReplaceData(encryptedElement, rgbOutput); } </code></pre> <p>I want to use the encrypted xml data as data source for easy data binding in xaml. I declare xml data at application level for application wide access. Here's how I declared it in App.xaml.</p> <pre><code> &lt;Application.Resources&gt; &lt;ResourceDictionary&gt; &lt;XmlDataProvider x:Key="encryptedBandsDataSource" Source="/RemoteConfigurator;component/encryptedBands.xml" d:IsDataSource="True"/&gt; &lt;/ResourceDictionary&gt; &lt;/Application.Resources&gt; </code></pre> <p>Problem is, I need to decrypt the xml file before App.xaml is even loaded. Is it possible to do that. How do I do that. Where do I decrypt the xml file? </p> <p>In short, how can I use encrypted xml file as application resources?</p>
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