hide.py 文件源码

def decrypt(data, password):
    """Decrypts data using the password.

    Decrypts the data using the provided password using the cryptography module.
    If the pasword or data is incorrect this will return None. 
    """

    password = bytes(password)

    #Salt is equal to password as we want the encryption to be reversible only
    #using the password itself
    kdf = PBKDF2HMAC(algorithm=hashes.AES(),
                     length=32,
                     salt=bytes(password),
                     iterations=100000,
                     backend=default_backend())

    key = base64.urlsafe_b64encode(kdf.derive(password))
    f = Fernet(key)
    token = f.decrypt(data)
    return token