I've been signing a msi and its external cabs without issue.

Can you provide the steps you are using to see if I can spot anything?

On Jul 8, 2013, at 9:30 AM, "Georg von Kries" <g...@creativbox.net> wrote:

> Hi all,
> 
> 
> 
> I've been using a <PatchCertificates> element in our installers for several
> years now, just in case we want to provide a patch and allow UAC patching.
> After switching to use external cab files, I have mentioned that this is
> broken. 
> 
> 
> 
> When using external cabs, singing them and inscribing the digital
> certificate via Insignia.exe, it will remove the certificates provided in
> the PatchCertificates element from the MsiDigitalCertificate table and add a
> new entry with the certificate used for singing the cab files. This is
> actually the same certificate (in our case), but the identifier in the
> MsiDigitalCertificate table is being replaced. Insignia (or actually the
> Inscriber) will use the certificates thumbprint as the identifier. This
> invalidates the foreign key in the MsiPatchCertificate table.
> 
> Additionally I cannot just use the certificate thumbprint as the identifier
> in  the <DigitalCertificate> element, because it might start with a number
> which makes it invalid as an identifier. 
> 
> 
> 
> Therefore I think there are two bugs in the Inscriber. InscribeDatabase()
> method:
> 
> 1.       It should not remove existing certificates from the
> MsiDigitalCertificate table
> 
> 2.       The used identifier can be invalid, if the certificate thumbprint
> starts with a number. E.g. an underscore should be added at the beginning
> 
> 
> 
> Am I missing something or is this a known limitation/bug? 
> 
> 
> 
> Kind regards,
> 
> Georg von Kries
> 
> 
> 
> 
> 
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