diff --git a/python_custom_client/auth.py b/python_custom_client/auth.py
index 65da869e62288ae4cacac63dbd73e67c99a9bb5d..10d649383f2e1de6ac4ccefe8abe057b6b4ae479 100644
--- a/python_custom_client/auth.py
+++ b/python_custom_client/auth.py
@@ -71,9 +71,6 @@ def pack_boolean(b):
 def pack_bytes(bytes_data):
     return struct.pack(f">{len(bytes_data)}s", bytes_data)
 
-def pack_rsa_key(key):
-    return struct.pack(f">{len(bytes(key.get_base64(), 'utf-8'))}s", key.get_bits())
-
 def _get_session_blob(key, service, username, algorithm, session_id, userauth_request):
     global public_key_bits