missing module with cryptography.hazmat

Nuitka seems to compile my project fine, but it fails at runtime with this error:

Traceback (most recent call last):
  File "/.../demo_crypt/main.py", line 1, in <module>
    from cryptography.hazmat.primitives.kdf.scrypt import Scrypt
  File "/.../demo_crypt/venv/lib/python3.7/site-packages/cryptography/hazmat/primitives/kdf/scrypt.py", line 14, in <module cryptography.hazmat.primitives.kdf.scrypt>
    from cryptography.hazmat.primitives import constant_time
  File "/.../demo_crypt/venv/lib/python3.7/site-packages/cryptography/hazmat/primitives/constant_time.py", line 11, in <module cryptography.hazmat.primitives.constant_time>
    from cryptography.hazmat.bindings._constant_time import lib
ModuleNotFoundError: No module named 'cryptography.hazmat.bindings._constant_time'

Here are the commands to reproduce it:

1. Make a virtualenv: python3.7 -m venv demo_crypt/venv
2. cd demo_crypt
3. pip install wheel cryptography
4. pip install -U "https://github.com/Nuitka/Nuitka/archive/develop.zip"
5. Create a main.py that contains:

from cryptography.hazmat.primitives.kdf.scrypt import Scrypt
from cryptography.hazmat.backends import default_backend

def scrypt(passphrase, salt, scrypt_n=1<<12, scrypt_r=12, scrypt_p=1):
    kdf = Scrypt(salt, length=32, n=scrypt_n, r=scrypt_r, p=scrypt_p, backend=default_backend())
    return kdf.derive(passphrase)

print(scrypt(b"junk", b"sea"))

1. Run python main.py to ensure that there are no errors.
2. python -m nuitka --follow-imports -j 10 --plugin-enable=pylint-warnings main.py
3. ./main.bin

[nixargh]

Looks like I’m having some similar issue:

    from cryptography.fernet import Fernet, InvalidToken
  File "/usr/lib/python3/dist-packages/cryptography/fernet.py", line 17, in <module cryptography.fernet>
    from cryptography.hazmat.primitives import hashes, padding
  File "/usr/lib/python3/dist-packages/cryptography/hazmat/primitives/padding.py", line 13, in <module cryptography.hazmat.primitives.padding>
    from cryptography.hazmat.bindings._padding import lib
ModuleNotFoundError: No module named 'cryptography.hazmat.bindings._padding'

I’ve got this trying to run my app after compilation.

I’ve checked nuitka/plugins/standard/ImplicitImports.py and it includes:

          elif full_name in (
              "cryptography.hazmat.bindings._openssl",
              "cryptography.hazmat.bindings._constant_time",
              "cryptography.hazmat.bindings._padding",
          ):
              yield "_cffi_backend", True

Any thoughts?

[kayhayen]

Closing this, to me the issue is failed, because I don’t have a reproducer, I don’t know what parts are fixed, please open new issues with full description. The things posted here are probably all different ones, but it’s unclear how relevant they are now.