[tor-bugs] #26712 [Core Tor/Tor]: EVP_PKEY_HKDF not defined in libressl, src/lib/crypt_ops/crypto_hkdf.c cannot compile

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#26712: EVP_PKEY_HKDF not defined in libressl, src/lib/crypt_ops/crypto_hkdf.c
cannot compile
-------------------------------------------------+-------------------------
 Reporter:  cypherpunks                          |          Owner:  nickm
     Type:  defect                               |         Status:
                                                 |  merge_ready
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  regression, compile-error,           |  Actual Points:
  035-must, 035-triaged-in-20180711              |
Parent ID:                                       |         Points:
 Reviewer:  asn                                  |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by asn):

 * status:  needs_review => merge_ready


Comment:

 I can verify that compilation fails with libressl on master, and that this
 patch makes it compile fine.

 I only managed to test this with libressl built in `/usr/local/lib`. I
 tried to compile this with libressl` built in a custom `DESTDIR` but I
 didn't manage to compile Tor properly like that.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26712#comment:7>
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