Django Fernet

A library that provides Django model fields to store value encrypted using Fernet.

Installation

With a correctly configured pipenv toolchain:

pipenv install django-fernet

You may also use classic pip to install the package:

pip install django-fernet

Auto-formatter setup

We use ruff (https://github.com/astral-sh/ruff) for local auto-formatting and for linting in the CI pipeline. The pre-commit framework (https://pre-commit.com) provides Git hooks for these tools, so they are automatically applied before every commit.

Steps to activate:

• Install the pre-commit framework: pip install pre-commit (for alternative installation options see https://pre-commit.com/#install)
• Activate the framework (from the root directory of the repository): pre-commit install

Hint: You can also run the formatters manually at any time with the following command: pre-commit run --all-files

Getting started

Example model that defines fernet text fields

from django.db import models
from django_fernet.fields import *


class ExampleTextModel(models.Model):
    example_field = FernetTextField(
        verbose_name="Example field",
    )

Example model that defines fernet binary fields

from django.db import models
from django_fernet.fields import *


class ExampleBinaryModel(models.Model):
    example_field = FernetBinaryField(
        verbose_name="Example field",
    )

How to use

Save encrypted text to the database

from django_fernet.fernet import *

field_data = FernetTextFieldData()
field_data.encrypt("foo", "--secret--")

instance = ExampleTextModel()
instance.example_field = field_data
instance.save()

Save encrypted binary data to the database

from django_fernet.fernet import *

field_data = FernetTextFieldData()
field_data.encrypt(b"foo", "--secret--")

instance = ExampleBinaryModel()
instance.example_field = field_data
instance.save()

Load encrypted text from the database

instance = ExampleTextModel.objects.get(pk=...)
decrypted_str = instance.example_field.decrypt("--secret--")

Load encrypted binary data from the database

instance = ExampleBinaryModel.objects.get(pk=...)
decrypted_bytes = instance.example_field.decrypt("--secret--")

Supported versions

	Django 4.2	Django 5.0	Django 5.1
Python 3.10	✓	✓	✓
Python 3.11	✓	✓	✓
Python 3.12	✓	✓	✓
Python 3.13	✓	✓	✓
PyPy 3.10	✓	✓	✓

Tests

An example Django app that makes use of django-fernet can be found in the tests/ folder. This example Django app also contains the unit tests.

Follow below instructions to run the tests. You may exchange the installed Django version according to your requirements.

# install dependencies
python -m pip install --upgrade pip
pip install -r requirements.txt

# run tests
cd tests && pytest

List of developers

• Andreas Stocker AStocker@anexia-it.com