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In this tutorial, i will explain you about How to Encryption of QueryString Module Tested Working. Now write the following code to get the right result:
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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Security.Cryptography; using System.Web; namespace Common { public class QueryStringModule : IHttpModule { // private ILog m_Logger = LogManager.GetLogger(typeof(QueryStringModule)); #region IHttpModule Members public void Dispose() { // Nothing to dispose } public void Init(HttpApplication context) { context.BeginRequest += new EventHandler(context_BeginRequest); } #endregion private const string PARAMETER_NAME = "enc="; private const string ENCRYPTION_KEY = "bnsingh"; void context_BeginRequest(object sender, EventArgs e) { HttpContext context = HttpContext.Current; string query = string.Empty; string path = string.Empty; try { if (context.Request.Url.OriginalString.Contains("aspx") && context.Request.RawUrl.Contains("?")) { query = ExtractQuery(context.Request.RawUrl); path = GetVirtualPath(); if (query.StartsWith(PARAMETER_NAME, StringComparison.OrdinalIgnoreCase)) { // Decrypts the query string and rewrites the path. string rawQuery = query.Replace(PARAMETER_NAME, string.Empty); string decryptedQuery = Decrypt(rawQuery); context.RewritePath(path, string.Empty, decryptedQuery); } else if (context.Request.HttpMethod == "GET") { // Encrypt the query string and redirects to the encrypted URL. // Remove if you don't want all query strings to be encrypted automatically. string encryptedQuery = Encrypt(query); context.Response.Redirect(path + encryptedQuery, false); } } } catch (Exception ex) { // m_Logger.Error("An error occurred while parsing the query string in the URL: " + path, ex); context.Response.Redirect("~/Common/ErrorHandler.aspx?ErrorMsg=" + ex.Message); //context.Response.Redirect("~/error.aspx?error="+ex.Message); } } /// <summary> /// Parses the current URL and extracts the virtual path without query string. /// </summary> /// <returns>The virtual path of the current URL.</returns> private static string GetVirtualPath() { string path = HttpContext.Current.Request.RawUrl; path = path.Substring(0, path.IndexOf("?")); path = path.Substring(path.LastIndexOf("/") + 1); return path; } /// <summary> /// Parses a URL and returns the query string. /// </summary> /// <param name="url">The URL to parse.</param> /// <returns>The query string without the question mark.</returns> private static string ExtractQuery(string url) { int index = url.IndexOf("?") + 1; return url.Substring(index); } #region Encryption/decryption /// <summary> /// The salt value used to strengthen the encryption. /// </summary> private readonly static byte[] SALT = Encoding.ASCII.GetBytes(ENCRYPTION_KEY.Length.ToString()); /// <summary> /// Encrypts any string using the Rijndael algorithm. /// </summary> /// <param name="inputText">The string to encrypt.</param> /// <returns>A Base64 encrypted string.</returns> public static string Encrypt(string inputText) { RijndaelManaged rijndaelCipher = new RijndaelManaged(); byte[] plainText = Encoding.Unicode.GetBytes(inputText); PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(ENCRYPTION_KEY, SALT); using (ICryptoTransform encryptor = rijndaelCipher.CreateEncryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16))) { using (MemoryStream memoryStream = new MemoryStream()) { using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write)) { cryptoStream.Write(plainText, 0, plainText.Length); cryptoStream.FlushFinalBlock(); return "?" + PARAMETER_NAME + Convert.ToBase64String(memoryStream.ToArray()); } } } } /// <summary> /// Decrypts a previously encrypted string. /// </summary> /// <param name="inputText">The encrypted string to decrypt.</param> /// <returns>A decrypted string.</returns> public static string Decrypt(string inputText) { RijndaelManaged rijndaelCipher = new RijndaelManaged(); byte[] encryptedData = Convert.FromBase64String(inputText); PasswordDeriveBytes secretKey = new PasswordDeriveBytes(ENCRYPTION_KEY, SALT); using (ICryptoTransform decryptor = rijndaelCipher.CreateDecryptor(secretKey.GetBytes(32), secretKey.GetBytes(16))) { using (MemoryStream memoryStream = new MemoryStream(encryptedData)) { using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read)) { byte[] plainText = new byte[encryptedData.Length]; int decryptedCount = cryptoStream.Read(plainText, 0, plainText.Length); return Encoding.Unicode.GetString(plainText, 0, decryptedCount); } } } } public static string EncryptPassword(string inputText) { RijndaelManaged rijndaelCipher = new RijndaelManaged(); byte[] plainText = Encoding.Unicode.GetBytes(inputText); PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(ENCRYPTION_KEY, SALT); using (ICryptoTransform encryptor = rijndaelCipher.CreateEncryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16))) { using (MemoryStream memoryStream = new MemoryStream()) { using (CryptoStream cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write)) { cryptoStream.Write(plainText, 0, plainText.Length); cryptoStream.FlushFinalBlock(); return Convert.ToBase64String(memoryStream.ToArray()); } } } } #endregion } } |
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