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Get-AuthenticodeSignature TimeStamperCertificate broken

Problem:

Get-AuthenticodeSignature does not return a time stamper certificate for files which have been time stamped with a valid time stamp server.

Steps to reproduce:

Using signtool.exe (from Windows SDK), view the signature info for signtool.exe. Verify that it has been time stamped, and that you can see the time stamper certificate.

Using Get-AuthenticodeSignature, view the signature of signtool.exe. Notice that the TimeStamperCertificate field is blank.

Consequences:

Powershell will report any signed file as valid as long as the signature is valid, regardless of whether or not the timestamp is valid.

Powershell version:
Major Minor Build Revision
----- ----- ----- --------
5 1 14393 1066

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