crypto_stash.py 文件源码

def _load_dkey(self):
        """
        Load derived key from existing stash file.
        """
        with open(self._path,'r',encoding='ascii') as fr:
            try:
                outer_data = json.load(fr)
            except json.decoder.JSONDecodeError:
                raise SSError("Invalid stash file structure")

        try:
            validate(outer_data,OUTER_SCHEMA)
        except ValidationError:
            raise SSError("Invalid outer schema")

        self._hash = outer_data['hash']
        self._salt = hex_str_to_bytes(outer_data['salt'])
        self._iterations = outer_data['iterations']

        # Derive key from password:
        dk = pbkdf2_hmac(self._hash,
                self._password,
                self._salt,
                self._iterations,
                nacl.secret.SecretBox.KEY_SIZE)

        self._box = nacl.secret.SecretBox(dk)