Try default tapo credentials for klap and aes (#685)

* Try default tapo credentials for klap and aes

* Add tests

kasa/protocol.py

@@ -10,6 +10,7 @@ which are licensed under the Apache License, Version 2.0
 http://www.apache.org/licenses/LICENSE-2.0
 """
 import asyncio
+import base64
 import contextlib
 import errno
 import logging
@@ -17,13 +18,14 @@ import socket
 import struct
 from abc import ABC, abstractmethod
 from pprint import pformat as pf
-from typing import Dict, Generator, Optional, Union
+from typing import Dict, Generator, Optional, Tuple, Union
 
 # When support for cpython older than 3.11 is dropped
 # async_timeout can be replaced with asyncio.timeout
 from async_timeout import timeout as asyncio_timeout
 from cryptography.hazmat.primitives import hashes
 
+from .credentials import Credentials
 from .deviceconfig import DeviceConfig
 from .exceptions import SmartDeviceException
 from .json import dumps as json_dumps
@@ -361,6 +363,18 @@ class TPLinkSmartHomeProtocol(BaseProtocol):
         ).decode()
 
 
+def get_default_credentials(tuple: Tuple[str, str]) -> Credentials:
+    """Return decoded default credentials."""
+    un = base64.b64decode(tuple[0].encode()).decode()
+    pw = base64.b64decode(tuple[1].encode()).decode()
+    return Credentials(un, pw)
+
+
+DEFAULT_CREDENTIALS = {
+    "KASA": ("a2FzYUB0cC1saW5rLm5ldA==", "a2FzYVNldHVw"),
+    "TAPO": ("dGVzdEB0cC1saW5rLm5ldA==", "dGVzdA=="),
+}
+
 # Try to load the kasa_crypt module and if it is available
 try:
     from kasa_crypt import decrypt, encrypt