Error signing with RS256

[damjtoh]

>>> import jws
>>> header = {'alg': 'RS256'}
>>> payload = { 'claim': 'JSON is the raddest.', 'iss': 'brianb' }
>>> signature = jws.sign(header, payload, 'secret')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Python/2.7/site-packages/jws/__init__.py", line 29, in sign
    signature = signer(_signing_input(head, payload, is_json), key)
  File "/Library/Python/2.7/site-packages/jws/algos.py", line 74, in sign
    return self.padder.new(key).sign(self.hashm)             # pycrypto 2.5
  File "build/bdist.macosx-10.10-intel/egg/Crypto/Signature/PKCS1_v1_5.py", line 106, in sign
AttributeError: 'str' object has no attribute 'n'

I couldn't find anything related to this issue.
I have pycrypto 2.6.1

Thanks.

[ender672]

@damjtoh - I got that error too when I tried passing a string as the secret key.

Try this:

from Crypto.PublicKey import RSA
key = RSA.importKey('secret')
...
signature = jws.sign(header, payload, key)