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Problem with private_key.pem

See original GitHub issue

I have done some tests with push notification and works. But when I integrate with django, I get this error:

File "/Users/myuser/.virtualenvs/myenv/lib/python3.6/site-packages/pywebpush/__init__.py", line 359, in webpush
    vv = Vapid.from_string(private_key=vapid_private_key)
  File "/Users/myuser/.virtualenvs/myenv/lib/python3.6/site-packages/py_vapid/__init__.py", line 142, in from_string
    return cls.from_der(pkey)
  File "/Users/myuser/.virtualenvs/myenv/lib/python3.6/site-packages/py_vapid/__init__.py", line 99, in from_der
    backend=default_backend())
  File "/Users/myuser/.virtualenvs/myenv/lib/python3.6/site-packages/cryptography/hazmat/primitives/serialization.py", line 28, in load_der_private_key
    return backend.load_der_private_key(data, password)
  File "/Users/myuser/.virtualenvs/myenv/lib/python3.6/site-packages/cryptography/hazmat/backends/multibackend.py", line 323, in load_der_private_key
    return b.load_der_private_key(data, password)
  File "/Users/myuser/.virtualenvs/myenv/lib/python3.6/site-packages/cryptography/hazmat/backends/openssl/backend.py", line 1018, in load_der_private_key
    password,
  File "/Users/myuser/.virtualenvs/myenv/lib/python3.6/site-packages/cryptography/hazmat/backends/openssl/backend.py", line 1160, in _load_key
    self._handle_key_loading_error()
  File "/Users/myuser/.virtualenvs/myenv/lib/python3.6/site-packages/cryptography/hazmat/backends/openssl/backend.py", line 1229, in _handle_key_loading_error
    raise ValueError("Could not deserialize key data.")
ValueError: Could not deserialize key data.

Why?

Issue Analytics

State:
Created 6 years ago
Comments:7 (4 by maintainers)

Top GitHub Comments

1reaction

jrconlincommented, Nov 30, 2017

Cool. No worries about the keys, I’m sure I can duplicate the problem.

1reaction

jrconlincommented, Nov 30, 2017

I’m not sure. The error is happening inside of the cryptography library, so there could be a number of reasons.

Is the private key data a valid PEM file? You can use a command like openssl ec -inform pem -in YourKeyFile.pem -text -noout

it should produce something like:

read EC key
Private-Key: (256 bit)
priv:
    00:96:70:09:fd:aa:7b:ff:29:22:fd:c3:af:5b:4e:
    4a:41:f2:0f:07:6f:89:9b:a5:46:d2:f0:64:d0:95:
    87:77:83
pub:
    04:46:cb:95:b6:e2:dd:7a:ed:eb:88:5a:00:bc:96:
    4a:41:f2:0f:07:6f:89:9b:a5:46:d2:f0:64:d0:95:
    00:96:70:09:fd:aa:7b:ff:29:22:fd:c3:af:5b:4e:
    56:4f:66:95:4d:0f:29:7d:12:ea:2f:4f:39:b0:4a:
    ef:e6:3d:43:ac
ASN1 OID: prime256v1
NIST CURVE: P-256

If not, the file may not be a proper key.

If that does work, (and if I understand that you’re able to send push notifications using something like pywebpush, just not if the library is integrated into django), then I’ve no idea. It may be a library version conflict, or some monkey patch, or anything, really. (cryptography and openssl can be terrible about randomly changing how things work via “minor” updates)

I don’t have a lot of time right now to dig into this, but I’ll try to get to it as soon as I can.