diff --git a/demo/httpsig.py b/demo/httpsig.py
index 5e3b22c..65e7a29 100644
--- a/demo/httpsig.py
+++ b/demo/httpsig.py
@@ -15,7 +15,7 @@ from datetime import datetime
 from loguru import logger
 
 from dataclasses import dataclass
-from demo.config import ID
+from demo.config import ID, KEY_PATH
 
 
 
@@ -165,3 +165,8 @@ class HTTPXSigAuth(httpx.Auth):
         logger.debug(f"signed request {sig_value=}")
         request.headers["signature"] = sig_value
         yield request
+
+
+k = KEY_PATH.read_text()
+k = RSA.importKey(k)
+auth = HTTPXSigAuth(k)