Ошибка при криптографической операции в отладке

Я получаю следующую ошибку. Кажется, это началось только после того, как я обновил свою визуальную студию 2015, чтобы получить первое обновление. Я прочитал несколько тем здесь об этой проблеме с машинным ключом? Я не уверен, как это исправить, и предотвратить это. В настоящее время я получаю эту ошибку на своей локальной машине, когда я запускаю ее при отладке с помощью IIS express.

Exception Details: System.Security.Cryptography.CryptographicException: Error occurred during a cryptographic operation.

Cache = db.UserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == userId);

// place the entry in memory
this.Deserialize((Cache == null) ? null : MachineKey.Unprotect(Cache.cacheBits,"ADALCache"));


[CryptographicException: Error occurred during a cryptographic operation.]
   System.Web.Security.Cryptography.HomogenizingCryptoServiceWrapper.HomogenizeErrors(Func`2 func, Byte[] input) +115
   System.Web.Security.Cryptography.HomogenizingCryptoServiceWrapper.Unprotect(Byte[] protectedData) +70
   System.Web.Security.MachineKey.Unprotect(ICryptoServiceProvider cryptoServiceProvider, Byte[] protectedData, String[] purposes) +62
   System.Web.Security.MachineKey.Unprotect(Byte[] protectedData, String[] purposes) +121
   LEDES.Models.ADALTokenCache..ctor(String signedInUserId) in C:\Users\RLewis\Source\Workspaces\Workspace\LEDES\LEDES\Models\AdalTokenCache.cs:28
   LEDES.Startup.<ConfigureAuth>b__7_0(AuthorizationCodeReceivedNotification context) in C:\Users\RLewis\Source\Workspaces\Workspace\LEDES\LEDES\App_Start\Startup.Auth.cs:54
   Microsoft.Owin.Security.OpenIdConnect.<AuthenticateCoreAsync>d__1a.MoveNext() +4388
   System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +26
   Microsoft.Owin.Security.OpenIdConnect.<AuthenticateCoreAsync>d__1a.MoveNext() +5776
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() +28
   Microsoft.Owin.Security.Infrastructure.<BaseInitializeAsync>d__0.MoveNext() +471
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   System.Runtime.CompilerServices.TaskAwaiter.GetResult() +26
   Microsoft.Owin.Security.Infrastructure.<Invoke>d__0.MoveNext() +218
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   System.Runtime.CompilerServices.TaskAwaiter.GetResult() +26
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.<RunApp>d__5.MoveNext() +170
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   System.Runtime.CompilerServices.TaskAwaiter.GetResult() +26
   Microsoft.Owin.Security.Infrastructure.<Invoke>d__0.MoveNext() +525
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   System.Runtime.CompilerServices.TaskAwaiter.GetResult() +26
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.<RunApp>d__5.MoveNext() +170
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   System.Runtime.CompilerServices.TaskAwaiter.GetResult() +26
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.<DoFinalWork>d__2.MoveNext() +166
   System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +26
   Microsoft.Owin.Host.SystemWeb.Infrastructure.ErrorState.Rethrow() +26
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.StageAsyncResult.End(IAsyncResult ar) +81
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContext.EndFinalWork(IAsyncResult ar) +30
   System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +380
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

Вот код из того, где он терпит неудачу. Это было создано VS, когда я выбираю аутентификацию Azure при настройке проекта.

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Data.Entity;
using System.Linq;
using System.Web;
using System.Web.Security;
using Microsoft.IdentityModel.Clients.ActiveDirectory;

namespace LEDES.Models
{
    public class ADALTokenCache : TokenCache
    {
        private ApplicationDbContext db = new ApplicationDbContext();
        private string userId;
        private UserTokenCache Cache;

        public ADALTokenCache(string signedInUserId)
        {
            // associate the cache to the current user of the web app
            userId = signedInUserId;
            this.AfterAccess = AfterAccessNotification;
            this.BeforeAccess = BeforeAccessNotification;
            this.BeforeWrite = BeforeWriteNotification;
            // look up the entry in the database
            Cache = db.UserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == userId);
            // place the entry in memory
            this.Deserialize((Cache == null) ? null : MachineKey.Unprotect(Cache.cacheBits,"ADALCache"));
        }

        // clean up the database
        public override void Clear()
        {
            base.Clear();
            var cacheEntry = db.UserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == userId);
            db.UserTokenCacheList.Remove(cacheEntry);
            db.SaveChanges();
        }

        // Notification raised before ADAL accesses the cache.
        // This is your chance to update the in-memory copy from the DB, if the in-memory version is stale
        void BeforeAccessNotification(TokenCacheNotificationArgs args)
        {
            if (Cache == null)
            {
                // first time access
                Cache = db.UserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == userId);
            }
            else
            { 
                // retrieve last write from the DB
                var status = from e in db.UserTokenCacheList
                             where (e.webUserUniqueId == userId)
                select new
                {
                    LastWrite = e.LastWrite
                };

                // if the in-memory copy is older than the persistent copy
                if (status.First().LastWrite > Cache.LastWrite)
                {
                    // read from from storage, update in-memory copy
                    Cache = db.UserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == userId);
                }
            }
            this.Deserialize((Cache == null) ? null : MachineKey.Unprotect(Cache.cacheBits, "ADALCache"));
        }

        // Notification raised after ADAL accessed the cache.
        // If the HasStateChanged flag is set, ADAL changed the content of the cache
        void AfterAccessNotification(TokenCacheNotificationArgs args)
        {
            // if state changed
            if (this.HasStateChanged)
            {
                Cache = new UserTokenCache
                {
                    webUserUniqueId = userId,
                    cacheBits = MachineKey.Protect(this.Serialize(), "ADALCache"),
                    LastWrite = DateTime.Now
                };
                // update the DB and the lastwrite 
                db.Entry(Cache).State = Cache.UserTokenCacheId == 0 ? EntityState.Added : EntityState.Modified;
                db.SaveChanges();
                this.HasStateChanged = false;
            }
        }

        void BeforeWriteNotification(TokenCacheNotificationArgs args)
        {
            // if you want to ensure that no concurrent write take place, use this notification to place a lock on the entry
        }

        public override void DeleteItem(TokenCacheItem item)
        {
            base.DeleteItem(item);
        }
    }
}

Информация из стека вызовов и точка попадания в CryptographicEsception

    System.Web.dll!System.Web.Security.Cryptography.HomogenizingCryptoServiceWrapper.HomogenizeErrors(System.Func<byte[], byte[]> func, byte[] input)   Unknown
    System.Web.dll!System.Web.Security.Cryptography.HomogenizingCryptoServiceWrapper.Unprotect(byte[] protectedData)    Unknown
    System.Web.dll!System.Web.Security.MachineKey.Unprotect(System.Web.Security.Cryptography.ICryptoServiceProvider cryptoServiceProvider, byte[] protectedData, string[] purposes) Unknown
    System.Web.dll!System.Web.Security.MachineKey.Unprotect(byte[] protectedData, string[] purposes)    Unknown
>   LEDES.dll!LEDES.Models.ADALTokenCache.ADALTokenCache(string signedInUserId) Line 28 C#
    LEDES.dll!LEDES.Startup.ConfigureAuth.AnonymousMethod__7_0(Microsoft.Owin.Security.Notifications.AuthorizationCodeReceivedNotification context) Line 54 C#
    Microsoft.Owin.Security.OpenIdConnect.dll!Microsoft.Owin.Security.OpenIdConnect.OpenIdConnectAuthenticationHandler.AuthenticateCoreAsync()  Unknown
    mscorlib.dll!System.Runtime.CompilerServices.AsyncMethodBuilderCore.MoveNextRunner.InvokeMoveNext(object stateMachine)  Unknown
    mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx)   Unknown
    mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx)   Unknown
    mscorlib.dll!System.Runtime.CompilerServices.AsyncMethodBuilderCore.MoveNextRunner.Run()    Unknown
    mscorlib.dll!System.Threading.Tasks.AwaitTaskContinuation.InvokeAction(object state)    Unknown
    mscorlib.dll!System.Threading.Tasks.AwaitTaskContinuation.RunCallback(System.Threading.ContextCallback callback, object state, ref System.Threading.Tasks.Task currentTask) Unknown
    mscorlib.dll!System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation.Run(System.Threading.Tasks.Task task, bool canInlineContinuationTask)   Unknown
    mscorlib.dll!System.Threading.Tasks.Task.FinishContinuations()  Unknown
    mscorlib.dll!System.Threading.Tasks.Task.FinishStageThree() Unknown
    mscorlib.dll!System.Threading.Tasks.Task<System.__Canon>.TrySetResult(System.__Canon result)    Unknown
    mscorlib.dll!System.Runtime.CompilerServices.AsyncTaskMethodBuilder<Microsoft.Owin.IFormCollection>.SetResult(Microsoft.Owin.IFormCollection result)    Unknown
    Microsoft.Owin.dll!Microsoft.Owin.OwinRequest.ReadFormAsync()   Unknown
    mscorlib.dll!System.Runtime.CompilerServices.AsyncMethodBuilderCore.MoveNextRunner.InvokeMoveNext(object stateMachine)  Unknown
    mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx)   Unknown
    mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx)   Unknown
    mscorlib.dll!System.Runtime.CompilerServices.AsyncMethodBuilderCore.MoveNextRunner.Run()    Unknown
    mscorlib.dll!System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation..cctor.AnonymousMethod__8_0(object state)   Unknown
    System.Web.dll!System.Web.AspNetSynchronizationContext.Post.AnonymousMethod__0()    Unknown
    System.Web.dll!System.Web.Util.SynchronizationHelper.SafeWrapCallback(System.Action action) Unknown
    System.Web.dll!System.Web.Util.SynchronizationHelper.QueueAsynchronous.AnonymousMethod__0(System.Threading.Tasks.Task _)    Unknown
    mscorlib.dll!System.Threading.Tasks.ContinuationTaskFromTask.InnerInvoke()  Unknown
    mscorlib.dll!System.Threading.Tasks.Task.Execute()  Unknown
    mscorlib.dll!System.Threading.Tasks.Task.ExecutionContextCallback(object obj)   Unknown
    mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx)   Unknown
    mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx)   Unknown
    mscorlib.dll!System.Threading.Tasks.Task.ExecuteWithThreadLocal(ref System.Threading.Tasks.Task currentTaskSlot)    Unknown
    mscorlib.dll!System.Threading.Tasks.Task.ExecuteEntry(bool bPreventDoubleExecution) Unknown
    mscorlib.dll!System.Threading.Tasks.Task.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem() Unknown
    mscorlib.dll!System.Threading.ThreadPoolWorkQueue.Dispatch()    Unknown
    mscorlib.dll!System.Threading._ThreadPoolWaitCallback.PerformWaitCallback() Unknown
    [Native to Managed Transition]  

Ответы

userId = signedInUserId;
this.AfterAccess = AfterAccessNotification;
this.BeforeAccess = BeforeAccessNotification;
this.BeforeWrite = BeforeWriteNotification;
// look up the entry in the database
Cache = db.UserTokenCacheList.FirstOrDefault(c => c.webUserUniqueId == userId);
// place the entry in memory
this.Deserialize((Cache == null) ? null : MachineKey.Unprotect(Cache.cacheBits,"ADALCache"));

{
    public class ApplicationDbContext : DbContext
    {
        public ApplicationDbContext()
            : base("DefaultConnection")
        {
        }

        public DbSet<UserTokenCache> UserTokenCacheList { get; set; }
    }

    public class UserTokenCache
    {
        [Key]
        public int UserTokenCacheId { get; set; }
        public string webUserUniqueId { get; set; }
        public byte[] cacheBits { get; set; }
        public DateTime LastWrite { get; set; }
    }
}

<system.web>    
    <machineKey
      validationKey="your validationKey"
      decryptionKey="your decryptionKey"      
    />
</system.web>