> It doesn't help that Microsoft does not embed the name of the party
who submitted an UEFI driver for signing in the signature itself.
Microsoft does do this; it's in an authenticated attribute with OID
1.3.6.1.4.1.311.2.1.12, aka "SPC_SP_OPUS_INFO_OBJID", it's documented as
part of Office document file formats (VBA signing):
https://docs.microsoft.com/en-us/openspecs/office_file_formats/ms-oshared/91755632-4b0d-44ca-89a9-9699afbbd268
The same thing is done for Windows drivers that they sign; Windows
understands this attribute (binaries from specific parties can be
blocked by the CiPolicy/SiPolicy which is Microsoft's current
Windows-specific revocation list du jour), but UEFI firmware does not
(yet).
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