[tor-dev] [tor-assistants] Python metrics-lib

Beck Chen csybeck at gmail.com
Mon May 7 17:49:23 UTC 2012

On Mon, May 7, 2012 at 5:13 PM, Karsten Loesing <karsten at torproject.org>wrote:

> On 5/6/12 3:36 AM, Damian Johnson wrote:
> > First I'd like to make sure that I'm clear on what we're trying to do.
> > The javadocs for VerifyDescriptors [1] says that it...
> >
> >> Verify server descriptors using the contained signing key.  Verify that
> >> 1) a contained fingerprint is actually a hash of the signing key and
> >> 2) a router signature was created using the signing key.
> >>
> >> Verify consensuses using the separate certs.  Verify that
> >> 1) the fingerprint in a cert is actually a hash of the identity key,
> >> 2) a cert was signed using the identity key,
> >> 3) a consensus was signed using the signing key from the cert.
> >
> > Honestly I'm not yet sure what most of this means. The first #2 is
> > simply checking that the descriptor content can be verified using the
> > router-signature and signing-key, right?
> Yup.  But you also need the first #1, or metrics-db could modify server
> descriptors at will, put in its own key, and re-sign the descriptor with
> that key, and stem would think everything's valid.

Then is it possible that metrics-db modifies the fingerprint at the same
so that the first #1 would pass? Any why would metrics-db try to do this at

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