As a small clarification - while Chrome has included the certificates, as
noted in the readme, the whitelist is based on SPKI. This was intentional,
to avoid situations of interoperability issues.
Whitelisting by certificate, rather than either SPKI or SPKI-Tuple, brings
with it significant compatibility risks to the ecosystem in terms of being
able to respond to issues. We've already seen this born out with respect to
DigiCert and their Managed PKI intermediates, and wanted to avoid
disruption to both Apple and Google that would otherwise destablize the
For example, if you note, there are two Google certificates, but they share
the same SPKI and Subject Name - which is why the Chromium whitelist only
has one certificate listed, as it extracts the SPKI from that resource as
part of the whitelist.
Apologies if the README didn't make that clearer, and happy if there are
suggestions or corrections based on that :)
On Fri, Feb 9, 2018 at 1:55 PM, Wayne Thayer via dev-security-policy <
> On Thu, Feb 8, 2018 at 7:26 AM, Kai Engert via dev-security-policy <
> firstname.lastname@example.org> wrote:
> > On 16.10.2017 19:32, Gervase Markham via dev-security-policy wrote:
> > > The subCAs that we know of that fall into this category belong to
> > > and Apple. If there are any other subCAs that fall into this category,
> > > please let us know immediately. Google has one such subCA; Apple has
> > seven.
> > Besides the informal list of 9 subCAs (8 unexpired) that Gerv has posted
> > on 2017-10-17, has Mozilla learned about any additional subCAs that will
> > require a similar treatment?
> > The Chrome team has posted a set of subordinate CAs to whitelist  that
> contains some differences from the list that Gerv posted. I will ask Apple,
> Google, and DigiCert to confirm which subordinates need to be whitelisted.
> I assume that the end of the primary development phase for Firefox 60,
> > which is early March 2018, will be the deadline to add whitelisting for
> > any such subCAs.
> > Kai
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