what does sigverif.exe do?

[mynick]

it is supposed to check file signatures
against the certificates that were used to sign the files -is that
enough to verify the signed driver is not corrupted?

 

[Bob I]

No, that is not what it does.
http://www.updatexp.com/sigverif-exe.html

 

[mynick]

No, that is not what it does.http://www.updatexp.com/sigverif-exe.html

a signature of the file includes a cheksum and
since sigverif brings up file signature verification window saying-
critical files have been digitaly signed so that any changes to these
files can be quickly detected,
sigverif can detect corrupt signed drivers

 

[Bob I]

Since you can have the same checksum for different files your assumption
is incorrect. It MIGHT indicate a corrupted file, and it might NOT.