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HttpSecureCookie, A Way to Encrypt Cookies with ASP.NET 2.0

, 3 Apr 2006 Ms-PL 195.4K 3.1K 110
Discussing how to encode and tamper-proof text and cookies using the MachineKey, by using reflection.
httpsecurecookie_demo.zip
Bin
AdamTibi.Web.Security.dll
httpsecurecookie_src.zip
Release
AdamTibi.Web.Security.dll
Properties
<%@ Page Language="C#" %>
<%@ Import Namespace="AdamTibi.Web.Security" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    protected void btnStore_Click(object sender, EventArgs e) {
        HttpCookie cookie = new HttpCookie("UserName", "Terminator");
        cookie.Expires = DateTime.Now.AddDays(1);
        HttpCookie encodedCookie = HttpSecureCookie.Encode(cookie);
        Response.Cookies.Add(encodedCookie);
    }

    protected void btnDisplay_Click(object sender, EventArgs e) {
        HttpCookie cookie = Request.Cookies["UserName"];
        lblDisplayBefore.Text = cookie.Value;
        HttpCookie decodedCookie = HttpSecureCookie.Decode(cookie);
        lblDisplayAfter.Text = decodedCookie.Value;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        Clicking this button will encode and store a cookie with Name=UserName and Value=Terminator<br />
        <asp:Button ID="btnStore" runat="server" OnClick="btnStore_Click" Text="Store" /><br />
        <br />
        Clicking this button will decode and display the content of the cookie havine Name=UserName<br />
        <asp:Button ID="btnDisplay" runat="server" OnClick="btnDisplay_Click" Text="Display" /><br />
        Before Decoding:
        <asp:Label ID="lblDisplayBefore" runat="server"></asp:Label><br />
        After Decoding:&nbsp; &nbsp;&nbsp;<asp:Label ID="lblDisplayAfter" runat="server"></asp:Label></div>
    </form>
</body>
</html>

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License

This article, along with any associated source code and files, is licensed under The Microsoft Public License (Ms-PL)

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About the Author

Adam Tibi
Architect
United Kingdom United Kingdom
Passionate about refining software practices, promoting self-motivated teams and orchestrating agile projects that hit the deadline.
Lives in London, UK and works as a .NET architect consultant in the City.

Need a pro service to help your organisation? Contact me via my website www.AdamTibi.net.
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