[prop220] Check all new certificate types (incl cross-cert and ed25519)

If we're using ed25519 authentication, we should understand and check all the relevant certificate types when they're presented in the CERTS cell.

Partially implemented in my work-in-progress legacy/trac#15055 (moved) branch.

changed milestone to %Tor: 0.2.9.x-final in legacy/trac

added TorCoreTeam201608 in Legacy / Trac actualpoints::2 in Legacy / Trac component::core tor/tor in Legacy / Trac milestone::Tor: 0.2.9.x-final in Legacy / Trac owner::nickm in Legacy / Trac parent::15055 in Legacy / Trac points::1 in Legacy / Trac priority::medium in Legacy / Trac prop220 in Legacy / Trac resolution::implemented in Legacy / Trac severity::normal in Legacy / Trac sponsor::U-must in Legacy / Trac status::closed in Legacy / Trac type::enhancement in Legacy / Trac labels

Trac:
Type: defect to enhancement

Remove "TorCoreTeam201605" keyword. The time machine is broken.

Trac:
Keywords: TorCoreTeam201605 prop220 deleted, prop220 added

Trac:
Sponsor: N/A to SponsorU-must

Trac:
Status: new to assigned

Partially implemented in my frequently-rebased 15055_wip branch, which parses the new types.

Trac:
Keywords: N/A deleted, TorCoreTeam201608 added

Next steps here:

• complete the or_handshake_certs_ed25519_ok function.
• Resolve all XXX items in it.
• Make it check expiration times.
• actually call it in the same places we call or_handshake_certs_rsa_ok.

Done in my 15055_wip branch.

Trac:
Actualpoints: N/A to 2

These are implemented in 15055_wip; folding them into legacy/trac#15055 (moved) as their parent ticket.

Trac:
Resolution: N/A to implemented
Status: assigned to closed

closed

changed time estimate to 8h

added 16h of time spent

moved from legacy/trac#19157 (moved)

added Feature + 1 deleted label and removed 1 deleted label

removed 1 deleted label