diff --git a/sigil/keys.py b/sigil/keys.py
index b787d81..d583da3 100644
--- a/sigil/keys.py
+++ b/sigil/keys.py
@@ -37,6 +37,10 @@ def public_bytes(public: PublicKey) -> bytes:
     )
 
 
+def public_from_private(private: PrivateKey) -> PublicKey:
+    return private.public_key()
+
+
 def from_public_bytes(raw: bytes) -> PublicKey:
     return Ed25519PublicKey.from_public_bytes(raw)