The timestamp isn't extracted yet, but the digest match is already
checked correctly and the certificate is exposed.

Change-Id: Ieca002a5c4ca0b96f4dc397c460adb7f88f5ffc7
Reviewed-on: https://gerrit.libreoffice.org/30499Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>