How to encrypt/decrypt different xml element with different RSA keys

[madrat]

I tried following code to encrypt and decrypt different XML elements using different RSA keys (Asymmetric keys). I was able to encrypt, bur unable to decrypt. I got "unable to retrieve the decryption key".Can any one point to the mistake? Thanks\[code\]namespace ConsoleApplication5{ class Program { static void Main(string[] args) { XmlDocument xmlDoc = new XmlDocument(); try { xmlDoc.PreserveWhitespace = true; xmlDoc.Load("test.xml"); } catch (Exception e) { Console.WriteLine(e.Message); } CspParameters cspParams = new CspParameters(); cspParams.KeyContainerName = "XML_ENC_RSA_KEY"; CspParameters cspParams2 = new CspParameters(); cspParams2.KeyContainerName = "XML_ENC_RSA_KEY2"; RSACryptoServiceProvider rsaKey = new RSACryptoServiceProvider(cspParams); RSACryptoServiceProvider rsaKey2 = new RSACryptoServiceProvider(cspParams2); try { // Encrypt the "creditcard" element. Encrypt(xmlDoc, "creditcard", "EncryptedElement1", rsaKey, "rsaKey"); Encrypt(xmlDoc, "tt", "EncryptedElement2", rsaKey2, "rsaKey2"); // Save the XML document. xmlDoc.Save("test.xml"); // Display the encrypted XML to the console. Console.WriteLine("Encrypted XML:"); Console.WriteLine(); Console.WriteLine(xmlDoc.OuterXml); Decrypt(xmlDoc, rsaKey, "rsaKey"); Decrypt(xmlDoc, rsaKey2, "rsaKey2"); xmlDoc.Save("test.xml"); // Display the encrypted XML to the console. Console.WriteLine(); Console.WriteLine("Decrypted XML:"); Console.WriteLine(); Console.WriteLine(xmlDoc.OuterXml); } catch (Exception e) { Console.WriteLine(e.Message); } finally { // Clear the RSA key. rsaKey.Clear(); rsaKey2.Clear(); } Console.ReadLine(); } public static void Encrypt(XmlDocument Doc, string ElementToEncrypt, string EncryptionElementID, RSA Alg, string KeyName) { // Check the arguments. if (Doc == null) throw new ArgumentNullException("Doc"); if (ElementToEncrypt == null) throw new ArgumentNullException("ElementToEncrypt"); //if (EncryptionElementID == null) // throw new ArgumentNullException("EncryptionElementID"); if (Alg == null) throw new ArgumentNullException("Alg"); if (KeyName == null) throw new ArgumentNullException("KeyName"); XmlElement elementToEncrypt = Doc.GetElementsByTagName(ElementToEncrypt)[0] as XmlElement; // Throw an XmlException if the element was not found. if (elementToEncrypt == null) { throw new XmlException("The specified element was not found"); } RijndaelManaged sessionKey = null; try { ////////////////////////////////////////////////// // Create a new instance of the EncryptedXml class // and use it to encrypt the XmlElement with the // a new random symmetric key. ////////////////////////////////////////////////// // Create a 256 bit Rijndael key. sessionKey = new RijndaelManaged(); sessionKey.KeySize = 256; EncryptedXml eXml = new EncryptedXml(); byte[] encryptedElement = eXml.EncryptData(elementToEncrypt, sessionKey, false); //////////////////////////////////////////////// // Construct an EncryptedData object and populate // it with the desired encryption information. //////////////////////////////////////////////// EncryptedData edElement = new EncryptedData(); edElement.Type = EncryptedXml.XmlEncElementUrl; edElement.Id = EncryptionElementID; // Create an EncryptionMethod element so that the // receiver knows which algorithm to use for decryption. edElement.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncAES256Url); // Encrypt the session key and add it to an EncryptedKey element. EncryptedKey ek = new EncryptedKey(); ek.Id = KeyName; byte[] encryptedKey = EncryptedXml.EncryptKey(sessionKey.Key, Alg, false); ek.CipherData = http://stackoverflow.com/questions/15592970/new CipherData(encryptedKey); ek.EncryptionMethod = new EncryptionMethod(EncryptedXml.XmlEncRSA15Url); KeyReference kryRef = new KeyReference("#KeyName"); ek.AddReference(kryRef); // Create a new DataReference element // for the KeyInfo element. This optional // element specifies which EncryptedData // uses this key. An XML document can have // multiple EncryptedData elements that use // different keys. DataReference dRef = new DataReference(); // Specify the EncryptedData URI. dRef.Uri = "#" + EncryptionElementID; // Add the DataReference to the EncryptedKey. ek.AddReference(dRef); // Add the encrypted key to the // EncryptedData object. edElement.KeyInfo.AddClause(new KeyInfoEncryptedKey(ek)); // Set the KeyInfo element to specify the // name of the RSA key. // Create a new KeyInfoName element. KeyInfoName kin = new KeyInfoName(); // Specify a name for the key. kin.Value = http://stackoverflow.com/questions/15592970/KeyName; // Add the KeyInfoName element to the // EncryptedKey object. ek.KeyInfo.AddClause(kin); // Add the encrypted element data to the // EncryptedData object. edElement.CipherData.CipherValue = encryptedElement; //////////////////////////////////////////////////// // Replace the element from the original XmlDocument // object with the EncryptedData element. //////////////////////////////////////////////////// EncryptedXml.ReplaceElement(elementToEncrypt, edElement, false); } catch (Exception e) { // re-throw the exception. throw e; } finally { if (sessionKey != null) { sessionKey.Clear(); } } } public static void Decrypt(XmlDocument Doc, RSA Alg, string KeyName) { // Check the arguments. if (Doc == null) throw new ArgumentNullException("Doc"); if (Alg == null) throw new ArgumentNullException("Alg"); if (KeyName == null) throw new ArgumentNullException("KeyName"); // Create a new EncryptedXml object. EncryptedXml exml = new EncryptedXml(Doc); // Add a key-name mapping. // This method can only decrypt documents // that present the specified key name. exml.AddKeyNameMapping(KeyName, Alg); // Decrypt the element. exml.DecryptDocument(); } }}\[/code\]