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Crypto nonce must be bytes instead of string for python3

File "stem/stem/descriptor/hidden_service_descriptor.py", line 329, in _decrypt_basic_auth
    cipher = Cipher(algorithms.AES(authentication_cookie), modes.CTR('\x00' * len(iv)), default_backend())
  File "/usr/lib/python3.5/site-packages/cryptography/hazmat/primitives/ciphers/modes.py", line 139, in __init__
    raise TypeError("nonce must be bytes")
TypeError: nonce must be bytescipher = Cipher(algorithms.AES(authentication_cookie), modes.CTR('\x00' * len(iv)), default_backend())

  File "/usr/lib/python3.5/site-packages/cryptography/hazmat/primitives/ciphers/modes.py", line 139, in !__init!__
    raise !TypeError("nonce must be bytes")

TypeError: nonce must be bytes

The above error shows up in python3. Most likely it is due to the recent migration from pycrypto to cryptography.

Fix: https://github.com/paraschetal/stem/commit/c09c9c723806d933445c5a33bceb20d31dcb99d3

Trac:
Username: feignix

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