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"""
This module imports the Fernet symmetric encryption algorithm from the cryptography library.
It allows for secure encryption and decryption of data using a secret key.
"""
from cryptography.fernet import Fernet
VAULT_FILE = "vault.sqlite"
def generate_key() -> bytes:
"""Generates a new encryption key."""
return Fernet.generate_key()
def load_key(key_file: str) -> bytes:
"""
Loads an existing encryption key from the file.
Args:
key_file (str): Path to the key file.
"""
with open(key_file, "rb") as key:
return key.read()
def encrypt(key: bytes, filename: str = VAULT_FILE) -> None:
"""Encrypts the data in the specified file using the provided key."""
f = Fernet(key)
with open(filename, "rb") as vault:
data = vault.read()
encrypted_data = f.encrypt(data)
with open(filename, "wb") as vault:
vault.write(encrypted_data)
def decrypt(key: bytes, filename: str = VAULT_FILE) -> None:
"""Decrypts the data in the specified file using the provided key."""
f = Fernet(key)
with open(filename, "rb") as vault:
encrypted_data = vault.read()
decrypted_data = f.decrypt(encrypted_data)
with open(filename, "wb") as vault:
vault.write(decrypted_data)
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