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POPadding is invalid and cannot be removed?
 

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    <p>I have looked online for what this exception means in relation to my program but can't seem to find a solution or the reason why it's happening to my specific program. I have been using the example provided my msdn for encrypting and decrypting an XmlDocument using the Rijndael algorithm. The encryption works fine but when I try to decrypt, I get the following exception: </p> <blockquote> <p>Padding is invalid and cannot be removed</p> </blockquote> <p>Can anyone tell me what I can do to solve this issue? My code below is where I get the key and other data. If the cryptoMode is false, it will call the decrypt method, which is where the exception occurs:</p> <pre><code>public void Cryptography(XmlDocument doc, bool cryptographyMode) { RijndaelManaged key = null; try { // Create a new Rijndael key. key = new RijndaelManaged(); const string passwordBytes = "Password1234"; //password here byte[] saltBytes = Encoding.UTF8.GetBytes("SaltBytes"); Rfc2898DeriveBytes p = new Rfc2898DeriveBytes(passwordBytes, saltBytes); // sizes are devided by 8 because [ 1 byte = 8 bits ] key.IV = p.GetBytes(key.BlockSize/8); key.Key = p.GetBytes(key.KeySize/8); if (cryptographyMode) { Ecrypt(doc, "Content", key); } else { Decrypt(doc, key); } } catch (Exception ex) { MessageBox.Show(ex.Message); } finally { // Clear the key. if (key != null) { key.Clear(); } } } private 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. XmlElement 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. EncryptedData edElement = new EncryptedData(); edElement.LoadXml(encryptedElement); // Create a new EncryptedXml object. EncryptedXml exml = new EncryptedXml(); // Decrypt the element using the symmetric key. byte[] rgbOutput = exml.DecryptData(edElement, alg); &lt;---- I GET THE EXCEPTION HERE // Replace the encryptedData element with the plaintext XML element. exml.ReplaceData(encryptedElement, rgbOutput); } </code></pre>
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    1. COCan you give it a try by explicitly setting the padding mode to be identical on both the encryption and decryption to be indentical. For example: alg.Padding = PaddingMode.NONE;
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    2. COWhat does the Encrypt() method look like?
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    3. COThanks guys that worked.
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