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In this case, the ToString() method uses the conventions of the query string, separating each value from the name with an equal sign (=) and separating each subsequent name/value pair with the ampersand (&) However, for this to work, you need to make sure the names and values of the actual item in the collection don t include these special characters To solve this problem, the ToString() method uses the HttpServerUtilityUrlEncode() method to escape the strings before joining them..

Here s the first portion of the ToString() method, which escapes and joins the collection settings into one string: public override string ToString() { StringBuilder Content = new StringBuilder(); // Go through the contents and build a // typical query string foreach (string key in baseKeys) { ContentAppend(HttpUtilityUrlEncode(key)); ContentAppend("="); ContentAppend(HttpUtilityUrlEncode(base[key])); ContentAppend("&"); } // Remove the last '&' ContentRemove(ContentLength-1, 1); .. The next step is to use the ProtectedData class to encrypt the data This class uses the DPAPI to encrypt the information and its Protect method to return a byte array, so you need to take additional steps to convert the byte array to a string form that s suitable for the query string One approach that seems reasonable is the static ConvertToBase64String() method, which creates a Base64-encoded string.

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Unfortunately, Base64 strings can include symbols that aren t allowed in the query string (namely, the equal sign) Although you could create a Base64 string and then URLencode it, this further complicates the decoding stage The problem is that the ToBase64String() method may also introduce a series of characters that look like URL-encoded character sequences These character sequences will then be incorrectly replaced when you decode the string A simpler approach is to use a different form of encoding This example uses hex encoding, which replaces each character with an alphanumeric code The methods for hex encoding aren t shown in this example, but they are available with the downloadable code .. // Now encrypt the contents using DPAPI byte[] EncryptedData = ProtectedDataProtect( EncodingUTF8GetBytes(ContentToString()), null, DataProtectionScope.

Don t Repeat Yourself (DRY)

LocalMachine); // Convert encrypted byte array to a URL-legal string // This would also be a good place to check that data // is not larger than typical 4 KB query string return HexEncodingGetString(EncryptedData); } You can place the string returned from EncryptedQueryStringToString() directly into a query string using the ResponseRedirect() method The destination page that receives the query data needs a way to deserialize and decrypt the string The first step is to create a new EncryptedQueryString object and supply the encrypted data To make this step easier, it makes sense to add a new constructor to the EncryptedQueryString class that accepts the encrypted string, as follows:.

public EncryptedQueryString(string encryptedData) { // Decrypt data passed in using DPAPI byte[] RawData = HexEncoding.GetBytes(encryptedData); byte[] ClearRawData = ProtectedData.Unprotect( RawData, null, DataProtectionScope.LocalMachine); string StringData = Encoding.UTF8.GetString(ClearRawData); // Split the data and add the contents int Index; string[] SplittedData = StringData.Split(new char[] { '&' }); foreach (string SingleData in SplittedData) { Index = SingleData.IndexOf('='); base.Add( HttpUtility.UrlDecode(SingleData.Substring(0, Index)), HttpUtility.UrlDecode(SingleData.Substring(Index + 1)) ); } } This constructor first decodes the hexadecimal information from the string passed in and uses the DPAPI to decrypt information stored in the query string. It then splits the information back into its parts and adds the key/value pairs to the base StringCollection. Now you have the entire infrastructure in place to create a simple test page and transmit information from one page to another in a secure fashion.

To try the EncryptedQueryString class, you need two pages one that sets the query string and redirects the user and another that retrieves the query string. The first one contains a text box for entering information, as follows: <form id="form1" runat="server"> <div> Enter some data here: <asp:TextBox runat="server" ID="MyData" /> <br /> <br /> <asp:Button ID="SendCommand" runat="server" Text="Send Info" OnClick="SendCommand_Click" /> </div> </form> When the user clicks the SendCommand button, the page sends the encrypted query string to the receiving page, as follows: protected void SendCommand_Click(object sender, EventArgs e) { EncryptedQueryString QueryString = new EncryptedQueryString(); QueryString.Add("MyData", MyData.Text); QueryString.Add("MyTime", DateTime.Now.ToLongTimeString()); QueryString.Add("MyDate", DateTime.Now.ToLongDateString()); Response.Redirect("QueryStringRecipient.aspx data=" + QueryString.ToString()); }

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