Exception during sign. 'SHA512' object has no attribute 'oid'

I created a key pair like so:

> openssl genrsa -out key.pem 4096
> openssl rsa -in key.pem -pubout -out pubkey.pem

Then in the python REPL:

>>> from jwt.contrib.algorithms.pycrypto import RSAAlgorithm
>>> import jwt
>>> jwt.register_algorithm('RS512', RSAAlgorithm(RSAAlgorithm.SHA512))
>>> with open('.keys/key.pem') as fo: private_key_bytes = fo.read()
...
>>> result = jwt.encode({'name':'John'}, private_key_bytes, algorithm='RS512')

This raises an exception:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "build/bdist.macosx-10.10-intel/egg/jwt/api.py", line 103, in encode
  File "build/bdist.macosx-10.10-intel/egg/jwt/contrib/algorithms/pycrypto.py", line 44, in sign
  File "site-packages/Crypto/Signature/PKCS1_v1_5.py", line 110, in sign
    em = EMSA_PKCS1_V1_5_ENCODE(mhash, k)
  File "site-packages/Crypto/Signature/PKCS1_v1_5.py", line 211, in EMSA_PKCS1_V1_5_ENCODE
    digestAlgo  = DerSequence([hash.oid, DerNull().encode()])
AttributeError: 'SHA512' object has no attribute 'oid'

[johnlockwood-wf]

PyCrypto just seems to be building badly in this virtualenv, so I’m going to close this. Thanks

[johnlockwood-wf]

I used pip installs instead of installing from cloned git repos.