How to choose your own password in cryptography library in python?

Question

I have this sample code that generates the key (password) by the fernet function to encrypt the string but what I want to do is choosing the password myself. How can I do it, please?

from cryptography.fernet import Fernet
key = Fernet.generate_key()
print(key)
message = "Hello World".encode()
key_obj = Fernet(key)
encrypted_message = key_obj.encrypt(message)
print(encrypted_message)
decrypted_message = key_obj.decrypt(encrypted_message)
print(decrypted_message)

From the documentation [using passwords with Fernet](https://cryptography.io/en/latest/fernet.html#using-passwords-with-fernet). Alternatively possible answers [here](https://stackoverflow.com/questions/44432945/generating-own-key-with-python-fernet/44527133), or [here](https://incolumitas.com/2014/10/19/using-the-python-cryptography-module-with-custom-passwords/). — Thymen, Mar 29 '21 at 14:59

score 1 · Answer 1 · answered Mar 29 '21 at 15:43

Fernet uses the key with "32 url-safe base64-encoded". If you want to set your own password, it should be of 32 bytes, e.g:

from cryptography.fernet import Fernet
import base64
key = base64.urlsafe_b64encode(b"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA")
print(key)
message = "Hello World".encode()
key_obj = Fernet(key)
encrypted_message = key_obj.encrypt(message)
print(encrypted_message)
decrypted_message = key_obj.decrypt(encrypted_message)
print(decrypted_message)

How to choose your own password in cryptography library in python?

1 Answers1