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By default, the machine key is auto generated unless you specify it directly in Web.config. However if you just let the machine key be auto generated, what happens is, if you move your site to a different server, the machine key is different and therefore it cannot decrypt the passwords and all your accounts would be locked out. The MachineKey class provides methods that expose the hashing and encryption logic that ASP.NET provides. For information about which encryption and hashing algorithms ASP.NET uses, and the key values that it uses with them, see machineKey Element (ASP.NET Settings Schema). Add Machine Key to machine.config in Load Balancing environment to multiple versions of.net framework. Ask Question Asked 7 years. How do I add a machine key to the machine.config file? Do I do it at server level in IIS or at website/application level for each site? You can add it to your web site's web.config. If there are multiple. Mar 14, 2018  Set Machine key parameters in webconfig. Mar 13, 2018 07:12 AM fatemeh97 LINK. I read How To: Configure MachineKey in ASP.NET in enter link description here It said: validationKey. This specifies the key that the HMAC algorithm uses to make ViewState tamper proof. This specifies the hashing algorithm used to generate HMACs.

• Machine.config Location
• Machine Key Web.config Generator Manual
• Cisco Config Generator

The implementation of the <machineKey> element in ASP.NET is replaceable. This allows most calls to ASP.NET cryptographic routines to be routed through a replacement data protection mechanism, including the new data protection system.

Package installation

Note

The new data protection system can only be installed into an existing ASP.NET application targeting .NET 4.5.1 or later. Installation will fail if the application targets .NET 4.5 or lower.

Ms office key free. To install the new data protection system into an existing ASP.NET 4.5.1+ project, install the package Microsoft.AspNetCore.DataProtection.SystemWeb. This will instantiate the data protection system using the default configuration settings.

When you install the package, it inserts a line into Web.config that tells ASP.NET to use it for most cryptographic operations, including forms authentication, view state, and calls to MachineKey.Protect. The line that's inserted reads as follows.

Tip

You can tell if the new data protection system is active by inspecting fields like __VIEWSTATE, which should begin with 'CfDJ8' as in the example below. 'CfDJ8' is the base64 representation of the magic '09 F0 C9 F0' header that identifies a payload protected by the data protection system.

Package configuration

The data protection system is instantiated with a default zero-setup configuration. However, since by default keys are persisted to the local file system, this won't work for applications which are deployed in a farm. To resolve this, you can provide configuration by creating a type which subclasses DataProtectionStartup and overrides its ConfigureServices method.

Below is an example of a custom data protection startup type which configured both where keys are persisted and how they're encrypted at rest. It also overrides the default app isolation policy by providing its own application name.

Tip

You can also use <machineKey applicationName='my-app' .. /> in place of an explicit call to SetApplicationName. This is a convenience mechanism to avoid forcing the developer to create a DataProtectionStartup-derived type if all they wanted to configure was setting the application name.

To enable this custom configuration, go back to Web.config and look for the <appSettings> element that the package install added to the config file. It will look like the following markup:

Fill in the blank value with the assembly-qualified name of the DataProtectionStartup-derived type you just created. If the name of the application is DataProtectionDemo, this would look like the below.

The newly-configured data protection system is now ready for use inside the application.

Definition

Provides a way to encrypt or hash data (or both) by using the same algorithms and key values that are used for ASP.NET forms authentication and view state.

Remarks

The MachineKey class provides methods that expose the hashing and encryption logic that ASP.NET provides. For information about which encryption and hashing algorithms ASP.NET uses, and the key values that it uses with them, see machineKey Element (ASP.NET Settings Schema).

Warning

Machine.config Location

The MachineKey APIs should only be used in an ASP.NET app. Behavior of the MachineKey APIs outside the context of an ASP.NET application is undefined

Methods

Machine Key Web.config Generator Manual

Cisco Config Generator

Applies to