JWT with Python SDK giving "Could not unserialize key data."
I am using Python 3.5. Here is my code,which is straight out of the docs, followed by the error.
from boxsdk import JWTAuth
auth = JWTAuth(
client_id='k29xaarbpae4znkghpay6rsixiitg1xc',
client_secret='AajZ60HOdKhsuX0PRe0mkv5agV1J61sf',
enterprise_id='XXXXXXX',
jwt_key_id='XXXXX',
rsa_private_key_file_sys_path='C:\\Users\\H470722\\Documents\\Keys\\private_key.pem',
rsa_private_key_passphrase='XXXXXXX',
store_tokens=lambda x, y: None,
)
access_token = auth.authenticate_instance()
Error:
>>>
RESTART: C:/Users/H470722/Documents/EIV Reporting ETL/Python Scripts/BoxTest.py
From cffi callback :
Traceback (most recent call last):
File "C:\Users\H470722\AppData\Roaming\Python\Python35\site-packages\cryptography\hazmat\backends\openssl\backend.py", line 101, in _pem_password_cb
pw_buf[:len(ud.password)] = ud.password
TypeError: a bytes-like object is required, not 'str'
Traceback (most recent call last):
File "C:/Users/H470722/Documents/EIV Reporting ETL/Python Scripts/BoxTest.py", line 10, in
store_tokens=lambda x, y: None,
File "C:\Users\H470722\AppData\Roaming\Python\Python35\site-packages\boxsdk\auth\jwt_auth.py", line 102, in __init__
backend=default_backend(),
File "C:\Users\H470722\AppData\Roaming\Python\Python35\site-packages\cryptography\hazmat\primitives\serialization.py", line 20, in load_pem_private_key
return backend.load_pem_private_key(data, password)
File "C:\Users\H470722\AppData\Roaming\Python\Python35\site-packages\cryptography\hazmat\backends\multibackend.py", line 305, in load_pem_private_key
return b.load_pem_private_key(data, password)
File "C:\Users\H470722\AppData\Roaming\Python\Python35\site-packages\cryptography\hazmat\backends\openssl\backend.py", line 1084, in load_pem_private_key
password,
File "C:\Users\H470722\AppData\Roaming\Python\Python35\site-packages\cryptography\hazmat\backends\openssl\backend.py", line 1253, in _load_key
self._handle_key_loading_error()
File "C:\Users\H470722\AppData\Roaming\Python\Python35\site-packages\cryptography\hazmat\backends\openssl\backend.py", line 1325, in _handle_key_loading_error
raise ValueError("Could not unserialize key data.")
ValueError: Could not unserialize key data.
What am I doing wrong?
-
I am not sure why you are seeing this error, but according to this thread it might be an issue with the format of the private key you are using.
-
I was looking at the Box SDK and it looks like it's in the JWTAuth object (jwt_auth.py) specifically:
```
with open(rsa_private_key_file_sys_path) as key_file:
self._rsa_private_key = serialization.load_pem_private_key(
key_file.read(),
password=rsa_private_key_passphrase,
backend=default_backend(),
)```
key_file.read() is passing it a string and it expects a bytes array (https://cryptography.io/en/latest/hazmat/primitives/asymmetric/serialization/#cryptography.hazmat.primitives.serialization.load_pem_private_key)
I am just manually writing my JWT Auth but I believe the key_file.read() should be wrapped with bytes.
```
with open(rsa_private_key_file_sys_path) as key_file:
self._rsa_private_key = serialization.load_pem_private_key(
bytes(key_file.read()),
password=rsa_private_key_passphrase,
backend=default_backend(),
)```
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