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
        if isinstance(key, six.text_type):
            key = key.encode("utf8")
        formatted_key = base64.urlsafe_b64encode(hashlib.sha256(key).digest())
        return Fernet(formatted_key)