[tor-bugs] #17807 [Tor]: Use OpenSSL 1.1.0 ASYNC engine support

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#17807: Use OpenSSL 1.1.0 ASYNC engine support
-----------------------------+--------------------------
     Reporter:  nickm        |      Owner:
         Type:  enhancement  |     Status:  new
     Priority:  Medium       |  Milestone:  Tor: 0.2.???
    Component:  Tor          |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |    Sponsor:
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 OpenSSL 1.1.0 will add a neat feature:
 {{{
   *) Added ASYNC support. Libcrypto now includes the async sub-library to
 enable
      cryptographic operations to be performed asynchronously as long as an
      asynchronous capable engine is used. See the ASYNC_start_job() man
 page for
      further details. Libssl has also had this capability integrated with
 the
      introduction of the new mode SSL_MODE_ASYNC and associated error
      SSL_ERROR_WANT_ASYNC. See the SSL_CTX_set_mode() and SSL_get_error()
 man
      pages. This work was developed in partnership with Intel Corp.
      [Matt Caswell]
 }}}

 If this works the way I imagine it would, we could have OpenSSL stick the
 RSA/DH/ECDH operations for TLS in another thread (for performance) or even
 in another process (for isolation).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17807>
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