--- a/app.py
+++ b/app.py
 import hashlib
+import hmac
 
 def verify(shared_secret: str, provided: str) -> bool:
     a = hashlib.sha256(shared_secret.encode()).hexdigest()
     b = hashlib.sha256(provided.encode()).hexdigest()
-    return hmac.compare_digest(a, b)
+    return a == b