How to use MachineKey.Protect for a cookie?

Question

I want to encrypt the ID that I am using in a cookie. I am using ASP.NET 4.5 so I want to use MachineKey.Protect to do it.

Code

    public static string Protect(string text, string purpose)     {         if (string.IsNullOrEmpty(text))             return string.Empty;                  byte[] stream = Encoding.Unicode.GetBytes(text);         byte[] encodedValue = MachineKey.Protect(stream, purpose);         return HttpServerUtility.UrlTokenEncode(encodedValue);     }      public static string Unprotect(string text, string purpose)     {         if (string.IsNullOrEmpty(text))             return string.Empty;          byte[] stream = HttpServerUtility.UrlTokenDecode(text);         byte[] decodedValue = MachineKey.Unprotect(stream, purpose);         return HttpServerUtility.UrlTokenEncode(decodedValue);     } 

When I use the following test data:

Protect():

Input: 775119337

Output: (Cookie) "HyV7ShLrb61cm9HWoHl2lUJtGMlMxLn60q27xwl7Ae1wpv31p7sJqfRDD8TMoSR8n8PPN1K7k7LsrjqWH6A-P17OblK3MApsDQRQLa8xj9A1"

UnProtect():

Output: "NwA3ADUAMQAxADkAMwAzADcA0"

The output isn't correct, of course, it should be the original ID I Input.

How do I get decrypt the cookie using MachineKey.UnProtect()?

Answer 1

decodedValue is the bytes you passed to MachineKey.Protect().
This is not UrlTokenEncoded; it's Unicode-encoded bytes.

You need to call Encoding.Unicode.GetString().

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From the OP:

public static string Protect(string text, string purpose) {     if (string.IsNullOrEmpty(text))         return null;      byte[] stream = Encoding.UTF8.GetBytes(text);     byte[] encodedValue = MachineKey.Protect(stream, purpose);     return HttpServerUtility.UrlTokenEncode(encodedValue); }  public static string Unprotect(string text, string purpose) {     if (string.IsNullOrEmpty(text))         return null;      byte[] stream = HttpServerUtility.UrlTokenDecode(text);     byte[] decodedValue = MachineKey.Unprotect(stream, purpose);     return Encoding.UTF8.GetString(decodedValue); }