[tor-bugs] #23071 [Core Tor/Tor]: test_hs_ntor.sh fails with recent pysha3

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#23071: test_hs_ntor.sh fails with recent pysha3
-----------------------------+------------------------------------
 Reporter:  nickm            |          Owner:  nickm
     Type:  defect           |         Status:  needs_review
 Priority:  Medium           |      Milestone:  Tor: 0.3.1.x-final
Component:  Core Tor/Tor     |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  python tests hs  |  Actual Points:  .1
Parent ID:                   |         Points:  .1
 Reviewer:  asn              |        Sponsor:  SponsorR
-----------------------------+------------------------------------

Comment (by asn):

 Hmm, the code is now:


 {{{
 try:
     import sha3
 except ImportError:
     # In python 3.6, the sha3 functions are in hashlib whether we
     # import sha3 or not.
     pass

 try:
     # Pull the sha3 functions in.
     from hashlib import sha3_256, shake_256
     shake_squeeze = shake_256.digest
 except ImportError:
     if hasattr(sha3, "SHA3256"):
 }}}

 I think there is a problem here: If the `sha3` import fails, and the `from
 hashlib...` import fails, then the `if hasattr(sha3, "SHA3256"):` will
 also fail since sha3 is undefined. That's when we should return 77, right?

 How about the following patch on top of your patch?
 {{{
 -    if hasattr(sha3, "SHA3256"):
 +    if "sha3" in sys.modules and hasattr(sha3, "SHA3256"):
 }}}

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23071#comment:4>
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