[tor-bugs] #34139 [Core Tor/Tor]: Build Tor without warnings or test failures with OpenSSL 3.0.0

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#34139: Build Tor without warnings or test failures with OpenSSL 3.0.0
------------------------------+--------------------------------
     Reporter:  nickm         |      Owner:  (none)
         Type:  enhancement   |     Status:  new
     Priority:  High          |  Milestone:  Tor: 0.4.4.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:  2             |   Reviewer:
      Sponsor:                |
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 According to the OpenSSL release strategy [release-strat] they're planning
 to release openssl 3.0.0 in early Q4 of this year.

 Currently, many of the APIs that Tor uses are deprecated in OpenSSL
 3.0.0-alpha [openssl-3].   It's still possible to build Tor with it, but
 you get a lot of deprecated-item warnings.  We should fix those warnings
 before OpenSSL 3 is released.

 Further, if we build without fatal warnings, there are some test failures.
 We should see if they are tor bugs or new openssl bugs, and fix them in
 the first case or report them in the second.

 I don't think we necessarily need to backport this: OpenSSL 1.1 will be
 supported until 2023-09-11 [release-strat], whereas support for 0.3.5 is
 scheduled to end on 2020-02-02.

 [release-strat] https://www.openssl.org/policies/releasestrat.html

 [openssl-3] https://www.openssl.org/blog/blog/2020/04/23/OpenSSL3.0Alpha1/

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34139>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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