[tor-bugs] #17639 [Core Tor/Tor]: provide an option to display the expiry date of a given ed25519 signing key

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#17639: provide an option to display the expiry date of a given ed25519 signing key
------------------------------------------------+--------------------------
 Reporter:  cypherpunks                         |          Owner:  isis
     Type:  enhancement                         |         Status:
                                                |  needs_revision
 Priority:  High                                |      Milestone:  Tor:
                                                |  0.3.2.x-final
Component:  Core Tor/Tor                        |        Version:  Tor:
                                                |  0.2.7.2-alpha
 Severity:  Normal                              |     Resolution:
 Keywords:  tor-ed25519-proto, review-group-21  |  Actual Points:
Parent ID:                                      |         Points:  1
 Reviewer:  nickm                               |        Sponsor:
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Comment (by isis):

 Replying to [comment:26 nickm]:
 > I vote for something like
 > {{{
 > signing-cert-expiry: 2017-07-25 08:30:15 UTC
 > }}}
 > for the output format, and document that you need to grep for the
 signing-cert-expiry.
 >
 > I guess that's probably enough, plus the manpage.  What do you think?

 Sounds good! This fits in well with the `char *description` for certs, so
 we should be able to expand this output format easily in the future for
 other/new types of certs.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17639#comment:27>
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