The decrypt-2fas-backup from wodny

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Raise cryptography.exceptions.InvalidTag

Greetings,

Thanks for your work on this script.
I'm trying to decrypt an exported file from Google Authenticator app.

Requirements:

% uname -a
Linux wattpad 6.0.7-arch1-1 #1 SMP PREEMPT_DYNAMIC Thu, 03 Nov 2022 18:01:58 +0000 x86_64 GNU/Linux

% python -V
Python 3.10.8

% pip3 install cryptography
Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: cryptography in /usr/lib/python3.10/site-packages (38.0.3)
Requirement already satisfied: cffi>=1.12 in /usr/lib/python3.10/site-packages (from cryptography) (1.15.1)
Requirement already satisfied: pycparser in /usr/lib/python3.10/site-packages (from cffi>=1.12->cryptography) (2.21)

Executing the script:

% ./decrypt-2fas-backup.py mypass ~/Downloads/2fas-backup-20221107223516.2fas
Traceback (most recent call last):
  File "/home/userspace/workspace/crypto/decrypt-2fas-backup/./decrypt-2fas-backup.py", line 51, in <module>
    main()
  File "/home/userspace/workspace/crypto/decrypt-2fas-backup/./decrypt-2fas-backup.py", line 46, in main
    credentials_dec = aesgcm.decrypt(nonce, credentials_enc, None)
  File "/usr/lib/python3.10/site-packages/cryptography/hazmat/primitives/ciphers/aead.py", line 210, in decrypt
    return aead._decrypt(backend, self, nonce, data, [associated_data], 16)
  File "/usr/lib/python3.10/site-packages/cryptography/hazmat/backends/openssl/aead.py", line 249, in _decrypt
    raise InvalidTag
cryptography.exceptions.InvalidTag

Would you have any clue?
Thanks.

Kindly,
W

Add default_backend to PBKDF2HMAC

Hi Wodny, thanks for the great script. It's simple and easy to understand.
The call to PBKDF2HMAC needs an extra argument before the closing paren backend=default_backend()
so the script needs this extra import
from cryptography.hazmat.backends import default_backend

Thanks again for your great code
Best wishes
Rob Howell

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