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Old March 1st, 2006, 02:31 PM
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Default Bad Data Error

Has anyone ever received the message below when attempting to run an application? Does anyone know what it means?

System.Security.Cryptography.CryptographicExceptio n: Bad Data.

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Old March 4th, 2006, 02:09 AM
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The error occurs when I am authenticating users using the code below. The code appears in the global.asax.cs file. The error occurs when it gets to the line:
FormsAuthenticationTicket authTicket = FormsAuthentication.Decrypt(httpcook.Value);

public void WindowsAuthentication_OnAuthenticate(Object sender, WindowsAuthenticationEventArgs e)
    WindowsIdentity id = e.Identity;
    string userIdentity = id.Name;
    string[] userRoles;
    string roleStr = "";

    //Make sure user is an authenticated user (use the User class)
    User user = new User();
    int userID = user.ValidateUser(Utilities.ParseUserLogin(userIde ntity));

    //User is not valid
    if (userID == 0)

    //If user is valid, get roles
    user = new User();
    userRoles = user.GetUserRoles(userID);

    // Create a string to persist the roles
    foreach (string role in userRoles)
        roleStr += role;

    FormsAuthenticationTicket authTicket =
        new FormsAuthenticationTicket(

    //Produces a string containing an encrypted authentication ticket suitable
    //for use in an HTTP cookie, given a FormsAuthenticationTicket.
    string encTicket = FormsAuthentication.Encrypt(authTicket);

    HttpCookie httpcook = new HttpCookie("authCookie", encTicket);


protected void Application_AuthenticateRequest(Object sender, EventArgs e)

    HttpCookie httpcook = Context.Request.Cookies["authCookie"];
    FormsAuthenticationTicket authTicket = FormsAuthentication.Decrypt(httpcook.Value);

    GenericIdentity genIdentity = new GenericIdentity(authTicket.Name);
    string[] roles = authTicket.UserData.Split(new char[] {'|'} ); //if more than one role

    GenericPrincipal genPrincipal = new GenericPrincipal(genIdentity, roles);

    //The principal object thus created would be accessed in the application
    //pages before allowing access to the individual functionality
    HttpContext.Current.User = genPrincipal;


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