[wdmaudiodev] Re: How to sign up with MS with the Win10 driver no charge "attestment" option

  • From: "Vincent Burel \(VB-Audio\)" <vincent.burel@xxxxxxxxxxxx>
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Mon, 26 Oct 2015 10:46:13 +0100

It sounds like the same problem I got some days ago

The driver was maybe not well cross signed (because missing Microsoft CER for

BTW: I found one trick to check that a sys file is well cross signed:

findstr /m "MicrosoftCodeVerifRoot" "mydriver.sys" (output nothing if not found)

(source reference: http://winprogger.com/cross-signing-kernel-mode-drivers/)


Vincent Burel


De : wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx]
De la part de Paul Titchener
Envoyé : dimanche 25 octobre 2015 20:38
À : wdmaudiodev@xxxxxxxxxxxxx
Objet : [wdmaudiodev] Re: How to sign up with MS with the Win10 driver no
charge "attestment" option

We’re now shipping our software that includes a Win 10 signed driver and for
most users it working correctly, both for users that did an upgrade to Win 10
and those that bought new Win 10 machines.

For now we detect the OS version during installation and Win 10 machines get
drivers signed both by us and MS, other OS’s get the drivers only signed by us.

But we’re occasionally hitting installation problems on some machines, commonly
(and maybe exclusively) Win7 ones, where they report that they get a message
about attempting to install an unsigned driver.

I’m wondering if these cases are being caused by a faulty OS detection by the

Tim, you had mentioned that here is an approach to build a single driver that
installs both on Win 10 and Win 7, 8 and 8.1 machines.

I thought the way we were signing our drivers, which is to sign them first with
our cert before submitting to MS, was the method that allowed this single

But Win 7 and Win 8 machines give us a bad cert message when we try to install
these dual signed drivers.

Was there another step (or different method) we need to take to build a single
driver that will install on a Win 7, 8 and 10 machine?


Paul Titcener

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