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Python Cryptographic (File Locking) Library

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Python Cryptographic (File Locking) Library


Use pip or pip3 to install PyFLocker

pip install pyflocker


pip3 install pyflocker


PyFLocker aims to be your last cryptographic library you will need for both portability and ease of use. Before you read on, check if you agree to at least one of these points:

  • PyCryptodome(x) and pyca/cryptography have very different public interfaces, which makes remembering all the imports very difficult, and leaves you reading docs under deadline.
  • Although pycryptodome(x) is easy to use, it is not as fast as pyca/cryptography.
  • The interface of pyca/cryptography is very difficult to use, let alone remember the import:
    from cryptography.hazmat.primitives.ciphers.algorithms import AES
    from cryptography.hazmat.primitives.ciphers import Modes
    from cryptography.hazmat.backends import default_backend
    # and so on...
  • You wish that only if pyca/cryptography would have been as easy to use as Pycryptodome(x), it would have made life more easy.
  • You sometimes think that the file locking script you wrote were faster somehow and played with both backends very well, but you weren't sure what to do.
    • And all the other solutions (and nonsolutions!) on the internet just confuses you more!

Look no more, you have arrived at the right destination!

PS: At least, those were my points which irritated me when I first used those libraries :)

Usage Overview

Not a "Yet Another Cryptographic Library"

PyFLocker provides you a seamless interface to both the backends, and switching is very easy:

from pyflocker.ciphers import AES, Backends
enc =, key, AES.MODE_GCM, nonce, backend=Backends.CRYPTOGRAPHY)

Want only a single backend throughout your code?

from pyflocker import set_default_backend, Backends

Ease of Use

PyFLocker provides reasonable defaults wherever possible:

from pyflocker.ciphers import RSA
priv = RSA.generate(2048)
with open('private_key.pem', 'xb') as f:

Don't believe me, try to do the same operation with pyca/cryptography, or just any other initialization.

In short, the interface is very fluid and easy on developer's mind.

Writing into file or file like objects

This is often a related problem when it comes to encryption, but think no more!

from pyflocker.ciphers import AES, Backends
# ... (key, nonce) already made
f1 = open('MySecretData.txt', 'rb')
f2 = open('MySecretData.txt.enc', 'xb')
enc =, key, AES.MODE_EAX, nonce,
              backend=Backends.CRYPTOGRAPHY, file=f1)
tag = enc.calculate_tag()

You can also use BytesIO in place of file objects.

Directly encrypting files

Just want to encrypt your file with AES, and even with various available modes?

from import locker
from pyflocker.ciphers import AES

passwd = b'no not this'
locker('./MySuperSecretFile.txt', passwd, aes_mode=AES.MODE_CFB)  # default is AES-GCM-256
# file stored as MySuperSecretFile.txt.pyflk

Base classes and tools for wrapping more backends

You can even wrap other tools and ciphers, if you are so inclined...

from pyflocker.ciphers import base

class MyCustomCipher(base.Cipher):
    def update(self, data):

    def update_into(self):

    def authenticate(self, data):

    def calculate_tag(self, data):

    def finalize(self):

    def my_other_finalizer(self):



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