Cryptography in Python

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• Python Code Examples

Organizatorium

Symmetric Cryptography

requirements.txt:

cryptography == 3.4.7

NOT TESTED:

from cryptography.fernet import Fernet
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC

def init_fernet(password):
    key = PBKDF2HMAC(algorithm=hashes.SHA256(), length=32, salt=b'some-salt',
                     iterations=1000, backend=default_backend()).derive(password)
    return Fernet(base64.urlsafe_b64encode(key))

# encrypt
password = ...
clear_data = ...
encrypted_file_path=....
cypher_data = init_fernet(password.encode('utf-8')).encrypt(clear_data)
with open(encrypted_file_path, mode='wb') as f:
  f.write(cypher_data)

# decrypt
clear_data_2 = init_fernet(password.encode('utf-8')).decrypt(cypher_data)