cffi is missing when cryptography is installed using poetry

[dimaqq]

Possible upstream: python-poetry/poetry#6102

python -c 'from cryptography.hazmat.primitives.ciphers.aead import AESGCM'

Fails with:

    from cryptography.hazmat.backends.openssl import aead
  File ...
    from cryptography.hazmat.backends.openssl.backend import backend
  File ...
    from cryptography.hazmat.bindings.openssl import binding
  File ...
    from cryptography.hazmat.bindings._openssl import ffi, lib
ModuleNotFoundError: No module named '_cffi_backend'

When cryptography is a dep in a poetry project. cffi is missing.

If cryptography is installed using pip, then cffi is installed, and the code above works.

[reaperhulk]

This issue, if it exists, is unlikely to be a cryptography issue, but rather a poetry one. That said, it also appears from the linked issue that upstream needs details as they are unable to reproduce.

[dimaqq]

You are correct, it was the manifestation of python-poetry/poetry#5970