如何在C＃3.0中以简单的方式加密Cookie内容？ [英] How can I encrypt a cookie content in a simple way in C# 3.0?

问题描述

如何以直接而简单的方式加密Cookie？

How can I encrypt a cookie in a direct and simple way?

谢谢!!

推荐答案

你可能不应该这样做。如果cookie是敏感的，只存储在服务器上。

You probably shouldn't be doing this. If the cookie is sensitive, store it only on the server.

如果你真的需要，有很多方法。首先，您需要将明文转换为字节数组，如下所示：

If you really need to, there are a number of ways to do it. First, you will need to convert the plaintext to a byte array, like this:

var plainBytes = Encoding.UTF8.GetBytes(plaintext);

如果您确定您的纯文本永远不会使用Unicode，您可以使用 Encoding.ASCII 这将导致更小的cookie）。

If you're sure that your plaintext will never use Unicode, you can use Encoding.ASCII instead; this will result in a smaller cookie).

然后，您需要加密它。最简单的方法是使用DPAPI，像这样。 （首先，添加对 System.Security.dll 的引用）。注意，这不会在服务器场上工作。

Then, you will need to encrypt it. The easiest way to do that is to use DPAPI, like this. (First, add a reference to System.Security.dll). Note that this will not work on a server farm.

var encryptedBytes = ProtectedData.Protect(plainBytes, null, DataProtectionScope.CurrentUser);

最后，您需要将其转换回文本，以便将其放入cookie。这最好在Base64中完成，像这样：

Finally, you need to convert it back to text so you can put it in the cookie. This is best done in Base64, like this:

Response.AddCookie("MyEncryptedCookie", Convert.ToBase64String(encryptedBytes));

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要解密Cookie，请按照以下步骤操作：

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To decrypt the cookie, you'll need to reverse these steps, like this:

var encryptedBytes = Convert.FromBase64String(Request.Cookies["MyEncryptedCookie"].Value);
var decryptedBytes = ProtectedData.Unprotect(encryptedBytes , null, DataProtectionScope.CurrentUser);
var plaintext = Encoding.UTF8.GetString(decryptedBytes);

请注意，即使对于小的明文，cookie也会非常大。

Note that the cookie will be very large, even for small plaintexts.

如果要在服务器场上使用此选项，可以使用AES;请查看 System.Security。 Cryptography.RijndaelManaged 。

If you want to use this on a server farm, you can use AES; look at System.Security.Cryptography.RijndaelManaged.

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