手动解密由asp.net核心身份

Question

基于我从How to manually decrypt and asp.net core auth cookie学到的知识 我试着做类似的事情。唯一的区别是cookie是由asp.net核心身份设置的。这是SetUp.cs中的部分：

    services.AddIdentity<ApplicationUser, IdentityRole>( options =>
        {
            options.Cookies.ApplicationCookie.AuthenticationScheme = "Cookies";
            options.Cookies.ApplicationCookie.DataProtectionProvider = DataProtectionProvider.Create(new DirectoryInfo(@"c:\shared-auth-ticket-keys\"));
        })
        .AddEntityFrameworkStores<ApplicationDbContext>()
        .AddDefaultTokenProviders();

以下是我在homeController.cs中尝试设置decrypt的方法：

    var cookies = HttpContext.Request.Cookies;

    var provider = DataProtectionProvider.Create(new DirectoryInfo(@"c:\shared-auth-ticket-keys\"));

    //Get a data protector to use with either approach
    var dataProtector = provider.CreateProtector("Identity.Application", "Cookies", "v2");

    //Get the decrypted cookie as plain text
    UTF8Encoding specialUtf8Encoding = new UTF8Encoding(encoderShouldEmitUTF8Identifier: false, throwOnInvalidBytes: true);

    foreach (var cookie in cookies)
    {
        byte[] protectedBytes = Base64UrlTextEncoder.Decode(cookie.Value);
        byte[] plainBytes = dataProtector.Unprotect(protectedBytes);
        string plainText = specialUtf8Encoding.GetString(plainBytes);
    }

但我总是收到以下错误： 钥匙圈中找不到钥匙{****** - ****}。

如何匹配key / dataProtectionProvider？