Generate a machineKey element for use in ASP.Net application. The method used below is based on the powershell script found in https://support.microsoft.com/en-gb/help/2915218/resolving-view-state-message-authentication-code-mac-errors. This tool is provided "AS IS" and the use of its' output is entirely at your own risk.
Important Security Message: we do not store or record machineKey's generated using this tool.