core.py 文件源码

def make_fernet(self, key):
        """
        Given a single encryption key, returns a Fernet instance using it.
        """

        from cryptography.fernet import Fernet
        key = key.encode('utf8')
        formatted_key = base64.urlsafe_b64encode(hashlib.sha256(key).digest())
        return Fernet(formatted_key)