[wdmaudiodev] Problem with test signed driver package
- From: "Paul Titchener" <pt@xxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Sat, 25 Sep 2010 13:25:10 -0700
(whoops, last email was accidentally sent before it was completed, sorry about
that)
I'm working on getting the sysfx sAPO example from the DDK to run.
I've got it running now in non-secure mode, with this reg key set to specify
the non-secure mode:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Audio
"DisableProtectedAudioDG"=dword:00000001
Now I need to get it functioning in secure mode without using that registry
setting, so I followed the instructions here:
http://msdn.microsoft.com/en-us/library/ff546236(v=VS.85).aspx
These instructions describe "How to Test Sign a Driver Package". The
instructions include an example script which I used as the starting point.
First I created a certificate as shown below:
Makecert -r -pe -ss PrivateCertStore -n "CN=TestCertforWDK" TestCert.cer
Then I made a .cat file for the driver install .inf and .dll files:
inf2cat /driver:sysfxAPO /os:7_X86
Then I signed the .cat file and .dll files:
SignTool sign /s PrivateCertStore sysfx.cat
SignTool sign /s PrivateCertStore swapAPO.dll
SignTool sign /s PrivateCertStore PropPageExt.dll
Then I added the test certificate to the certificate store:
certmgr.exe -add testcert.cer -s -r localMachine root
certmgr.exe -add testcert.cer -s -r localMachine trustedpublisher
After doing this, when installing the driver I do see less error messages
relating to verfication occurring in the setupapi log files than prior to the
signing.
However, with the DisableProtectedAudioDG registry setting off, the swapAPO.dll
is not getting called during the audio processing, ie the processing isn't
occuring.
Turning that reg setting back on and rebooting makes the swapAPO.dll do the
processing correctly.
Also when you do a Properties->Driver->Driver Details on the installed swap
driver, it shows all the expected installed dlls, but the swapAPO and
PropPageExt dll don't have a certificate icon next to them, the other files
shown do have the certificate, as do all the files for other audio drivers I've
looked at.
If you do Properties on the swapAPO and PropPageExt dll files themselves, it
shows there is a Digital Signatures tab, and as expected is shows a signature
list with TestCertforWDK as the name of the signer.
One thing that's confusing to me though is none of the other installed dll
files in the folder, which must signed correctly, even have a Digital
Signatures tab.
Does anyone have any suggestions on what additional steps I need to take to get
these test signatures to function correctly?
Thanks,
Paul T.
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