[Cryptography-dev] Python cryptography fails to load due to _rust DDL import error

[Gualtiero Scotti]

Thank you Alex for your response.  Could you provide me more details?
Thanks in advance

Il Ven 4 Ago 2023, 18:02 Alex Gaynor <alex.gaynor at gmail.com> ha scritto:

> This very likely indicates that however you've packaged and installed
> the application in your environment isn't properly including the
> extension module for cryptography.
>
> Alex
>
> On Fri, Aug 4, 2023 at 11:20 AM Gualtiero Scotti <tierox at gmail.com> wrote:
> >
> > I'm struggling with this issue from few days...
> >
> > I've a Python application that can run in two ways:
> >
> > Stand alone -> launched directly using the python interpreter
> > From a windows service -> wrapping application with pywin32 and using
> the same interpreter
> >
> > When app starts in standalone mode it works fine but when starts through
> Windows service it fails with the following stackTrace:
> >
> > .............................
> > from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
> > File "C:\Program Files
> (x86)\...\Python\Lib\site-package\cryptography\hazmat\primitives\kdf\pbkdf2.py",
> line 10, in <module>
> > from cryptography.exceptions import (
> > File "C:\Program Files
> (x86)\...\Python\Lib\site-packages\cryptography\exceptions.py", line 9, in
> <module>
> > from cryptography.hazmat.bindings._rust import exceptions as
> rust_exceptions
> > ImportError: DLL load failed while importing _rust: The specified module
> could not be found."
> >
> > I' don't know wich DLLs cryptography uses.....maybe they are not in
> librarypath???
> >
> > Python 3.11.3 32-bit
> > Windows 11
> >
> > Requirements.txt
> >
> > pywin32==305 pywin32-ctypes~=0.2.0 Flask~=2.1.2 flask-login~=0.6.1
> Werkzeug~=2.0.2 waitress~=2.1.2 websockets~=10.3 transitions~=0.8.11
> bitstruct~=8.15.1 PyYAML~=6.0 passlib~=1.7.4 dacite~=1.5.1 paho-mqtt~=1.6.1
> setuptools~=60.2.0 six~=1.16.0 MarkupSafe~=2.1.1 click~=8.1.3
> itsdangerous~=2.1.2 Jinja2~=3.1.2 pythonnet~=3.0.1 requests~=2.29.0
> pyserial~=3.5.0 zeep~=4.2.1 cryptography~=41.0.2 pycryptodome~=3.18.0
> >
> > Did someone have the same issue? Any suggestion is appreciated.
> >
> > Thanks in advance.
> >
> > _______________________________________________
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> > Cryptography-dev at python.org
> > https://mail.python.org/mailman/listinfo/cryptography-dev
>
>
>
> --
> All that is necessary for evil to succeed is for good people to do nothing.
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