diff --git a/src/shamira/util.py b/src/shamira/util.py
new file mode 100644
--- /dev/null
+++ b/src/shamira/util.py
@@ -0,0 +1,7 @@
+try:
+	from functools import cache
+except ImportError:  # Python<3.9
+	from functools import lru_cache
+
+	def cache(f):
+		return lru_cache(maxsize=None)(f)