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POBad Data cryptographicexception in xml using Linq in c#
 

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  1. POBad Data cryptographicexception in xml using Linq in c#
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    <p>My XML file:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;dskh&gt; &lt;khachhang maso="kh01"&gt; &lt;ten_kh&gt;thehung&lt;/ten_kh&gt; &lt;tuoi_kh&gt;15&lt;/tuoi_kh&gt; &lt;dchi_kh&gt;hochiminh&lt;/dchi_kh&gt; &lt;/khachhang&gt; &lt;khachhang maso="kh02"&gt; &lt;ten_kh&gt;hung&lt;/ten_kh&gt; &lt;tuoi_kh&gt;15&lt;/tuoi_kh&gt; &lt;dchi_kh&gt;hcm&lt;/dchi_kh&gt; &lt;/khachhang&gt; &lt;/dskh&gt; </code></pre> <p>My Encrypt and Decrypt code:</p> <pre><code>class Program { // Call this function to remove the key from memory after use for security. [System.Runtime.InteropServices.DllImport("KERNEL32.DLL", EntryPoint = "RtlZeroMemory")] public static extern bool ZeroMemory(ref string Destination, int Length); // Function to Generate a 64 bits Key. static string GenerateKey() { // Create an instance of Symetric Algorithm. Key and IV is generated automatically. DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create(); // Use the Automatically generated key for Encryption. return ASCIIEncoding.ASCII.GetString(desCrypto.Key); } static void EncryptFile(string sInputFilename, string sOutputFilename, string sKey) { FileStream fsInput = new FileStream(sInputFilename,FileMode.Open,FileAccess.Read); FileStream fsEncrypted = new FileStream(sOutputFilename,FileMode.Create,FileAccess.Write); DESCryptoServiceProvider DES = new DESCryptoServiceProvider(); DES.Key = Encoding.UTF8.GetBytes(sKey); DES.IV = Encoding.UTF8.GetBytes(sKey); ICryptoTransform desencrypt = DES.CreateEncryptor(); CryptoStream cryptostream = new CryptoStream(fsEncrypted,desencrypt,CryptoStreamMode.Write); byte[] bytearrayinput = new byte[fsInput.Length - 1]; fsInput.Read(bytearrayinput, 0, bytearrayinput.Length); cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length); } static void DecryptFile(string sInputFilename, string sOutputFilename, string sKey) { DESCryptoServiceProvider DES = new DESCryptoServiceProvider(); //A 64 bit key and IV is required for this provider. //Set secret key For DES algorithm. DES.Key = Encoding.UTF8.GetBytes(sKey); //Set initialization vector. DES.IV = Encoding.UTF8.GetBytes(sKey); //Create a file stream to read the encrypted file back. FileStream fsread = new FileStream(sInputFilename, FileMode.Open, FileAccess.Read); //Create a DES decryptor from the DES instance. ICryptoTransform desdecrypt = DES.CreateDecryptor(); //Create crypto stream set to read and do a //DES decryption transform on incoming bytes. CryptoStream cryptostreamDecr = new CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read); //Print the contents of the decrypted file. StreamWriter fsDecrypted = new StreamWriter(sOutputFilename); fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd()); fsDecrypted.Flush(); fsDecrypted.Close(); } static void Main(string[] args) { // Must be 64 bits, 8 bytes. // Distribute this key to the user who will decrypt this file. string sSecretKey; // Get the key for the file to encrypt. sSecretKey = GenerateKey(); // For additional security pin the key. GCHandle gch = GCHandle.Alloc(sSecretKey, GCHandleType.Pinned); // Encrypt the file. EncryptFile(@"C:\xml_kh.xml", @"C:\xml_encry.xml", sSecretKey); //Decrypt the file. DecryptFile(@"C:\xml_encry.xml", @"C:\xml_decry.xml", sSecretKey); } } </code></pre> <p>When i excute Decrypt code, i get <strong>Cryptographicexception: Bad Data</strong> here:</p> <pre><code>//Print the contents of the decrypted file. StreamWriter fsDecrypted = new StreamWriter(sOutputFilename); fsDecrypted.Write(new StreamReader(cryptostreamDecr).ReadToEnd()); fsDecrypted.Flush(); fsDecrypted.Close(); </code></pre> <p>Please help me!!!</p>
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