[tahoe-lafs-trac-stream] [Tahoe-LAFS] #1792: make Tahoe-LAFS work under PyPy

[Tahoe-LAFS]

#1792: make Tahoe-LAFS work under PyPy
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     Reporter:  davidsarah  |      Owner:
         Type:  defect      |     Status:  new
     Priority:  normal      |  Milestone:  eventually
    Component:  packaging   |    Version:  1.9.2
   Resolution:              |   Keywords:  pypy cpyext packaging pycryptopp
Launchpad Bug:              |
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Old description:

> If I remember correctly, the main obstacle was extension modules. Current
> PyPy [http://morepypy.blogspot.co.uk/2010/04/using-cpython-extension-
> modules-with.html supports extension modules compiled for CPython], but
> is not 100% compatible with the CPython extension API.
>
> [https://bugs.pypy.org/issue735 Twisted apparently now builds correctly
> with PyPy.]

New description:

 If I remember correctly, the main obstacle was extension modules. Current
 PyPy [http://morepypy.blogspot.co.uk/2010/04/using-cpython-extension-
 modules-with.html supports extension modules compiled for CPython], but is
 not 100% compatible with the CPython extension API.

 [https://bugs.pypy.org/issue735 Twisted apparently now builds correctly
 with PyPy.]

--

Comment (by hawkowl):

 From an IRC discussion about why it doesn't work (pycryptopp), I decided
 to look at Cryptography and pynacl, and what uses pycryptopp in tahoe.

 - ed25519 is supported by pynacl.
 - AES is supported by Cryptography.
 - RSA keys (in many formats) are supported by Cryptography.
 - SHA256 hashes are supported by Cryptography.

 Zooko mentioned that Cryptography has a hard dependency on OpenSSL (which
 he rightfully dislikes) but my unqualified self thinks that it might not
 be so bad. Worth a shot, maybe? I have (some) time on Tuesday's PyCon AU
 sprint session to maybe take a hack on it, if the maintainers don't find
 the current-hard-dep on OpenSSL a dealbreaker.

--
Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1792#comment:2>
Tahoe-LAFS <https://Tahoe-LAFS.org>
secure decentralized storage