Uknown hazmat backend issue on Ubuntu 12.04 LTS

[orion-napofearth]

I'm getting an error when running a very simple test of Fernet on Ubuntu 12.04 LTS after upgrading from cryptography 0.9 to 1.3.1.

Using the sample code found at https://cryptography.io/en/latest/fernet/ I get:

(virtualenv)root@web-dev# python
Python 2.7.3 (default, Dec 18 2014, 19:10:20) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from cryptography.fernet import Fernet
>>> key = Fernet.generate_key()
>>> f = Fernet(key)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/mediagraph/src/web/build/virtualenv/local/lib/python2.7/site-packages/cryptography-1.3.1-py2.7-linux-x86_64.egg/cryptography/fernet.py", line 32, in __init__
    backend = default_backend()
  File "/opt/mediagraph/src/web/build/virtualenv/local/lib/python2.7/site-packages/cryptography-1.3.1-py2.7-linux-x86_64.egg/cryptography/hazmat/backends/__init__.py", line 35, in default_backend
    _default_backend = MultiBackend(_available_backends())
  File "/opt/mediagraph/src/web/build/virtualenv/local/lib/python2.7/site-packages/cryptography-1.3.1-py2.7-linux-x86_64.egg/cryptography/hazmat/backends/__init__.py", line 22, in _available_backends
    "cryptography.backends"
AttributeError: 'EntryPoint' object has no attribute 'resolve'
>>> 

The cryptography egg is built from source on pypi. Any thoughts on what might be going wrong here? Much appreciated.

[alex]

How did you install cryptography? This error is caused by using an old version of setuptools. pip install cryptography will install a new version of setuptools.

[orion-napofearth]

Thanks @alex for the quick response! An old version of setuptools might indeed be the issue. It looks like I have something that is fairly old

python -m easy_install --version
distribute 0.6.24

Is this dependency something that changed between cryptography 0.9 and 1.3.1?

[alex]

Yes, it did. It started with cryptography 1.3:
30e199e

On Fri, Mar 25, 2016 at 8:08 PM, Orion Reblitz-Richardson <
notifications@github.com> wrote:

Thanks @alex https://github.com/alex for the quick response! An old
version of setuptools might indeed be the issue. It looks like I have
something that is fairly old

python -m easy_install --version
distribute 0.6.24

Is this dependency something that changed between cryptography 0.9 and
1.3.1?

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[orion-napofearth]

I verified that after running pip install --upgrade distribute the test does pass. Unfortunately we do our own python packaging, so I'll need to determine how to exactly get that dependency in. Thank you for your help, though! That was incredibly helpful.

[ik-grit]

setuptools appears to be the cause of the issue. this worked for me

wget https://bootstrap.pypa.io/ez_setup.py -O - | sudo python

[fusco]

thanks @ik-grit , it works like a charm !