Add an ed25519-identity file to the data directory

Relays print their RSA fingerprint to a "fingerprint" file in their data directory.

We need an equivalent file for base-64 encoded ed25519 public keys.

changed milestone to %Tor: 0.4.4.x-final in legacy/trac

added 044-can in Legacy / Trac component::core tor/tor in Legacy / Trac easy in Legacy / Trac milestone::Tor: 0.4.4.x-final in Legacy / Trac owner::neel in Legacy / Trac points::1 in Legacy / Trac priority::medium in Legacy / Trac reviewer::dgoulet in Legacy / Trac severity::normal in Legacy / Trac status::needs-review in Legacy / Trac tor-relay in Legacy / Trac type::enhancement in Legacy / Trac labels

Trac:
Owner: N/A to neel
Status: new to assigned

Please make a separate branch for this change, it is independent of the parent ticket.

Please write unit tests, and update the files section in the man page.

This ticket hasn't made progress, so I'm un-assigning it.

Trac:
Owner: neel to N/A

Trac:
Parent: legacy/trac#22029 (moved) to N/A
Keywords: tor-relay deleted, tor-relay easy added

legacy/trac#22029 (moved) was accepted and will get merged, so re-assigning this to me.

Trac:
Owner: N/A to neel

PR: https://github.com/torproject/tor/pull/1651

Trac:
Status: assigned to needs_review

Don't have tests, setting as needs revision.

Trac:
Status: needs_review to needs_revision

Added tests, setting as needs review.

Trac:
Status: needs_revision to needs_review

Trac:
Keywords: tor-relay easy deleted, tor-relay easy 043-can added
Milestone: Tor: unspecified to Tor: 0.4.3.x-final

Trac:
Reviewer: N/A to mikeperry

I made a suggestion on the pull request:

Rather than copying and pasting code from router_write_fingerprint(), we could add an argument to that function that makes it write the ed25519 identity.

Trac:
Status: needs_review to needs_revision

Trac:
Status: needs_revision to needs_review

Trac:
Reviewer: mikeperry to N/A

teor's suggestion has not been fixed but I also see they were waiting for mikeperry to weigh in.

I think that is a good request. Within keys/, we use the underscore but at the root of the DataDirectory everything uses a dash - so lets go with that which is ed25519-identity file name.

Trac:
Status: needs_review to needs_revision
Reviewer: N/A to dgoulet

Trac:
Summary: Add an ed25519_identity file to the data directory to Add an ed25519-identity file to the data directory

0.4.3 is in feature freeze, this will have to go in 0.4.4 or later.

Trac:
Keywords: tor-relay easy 043-can deleted, tor-relay easy prop311-can added
Sponsor: N/A to Sponsor55-can
Parent: N/A to legacy/trac#33050 (moved)
Milestone: Tor: 0.4.3.x-final to Tor: 0.4.4.x-final

We don't need to do this task as part of the Relay IPv6 project any more, because in legacy/trac#33428 (moved) we loaded the key file directly into chutney.

Trac:
Keywords: tor-relay easy prop311-can deleted, tor-relay easy added
Sponsor: Sponsor55-can to N/A

Trac:
Parent: legacy/trac#33050 (moved) to N/A