diff --git a/Ed25519/Extensions.cs b/Ed25519/Extensions.cs
index 7e2ff16..e6ee0f4 100644
--- a/Ed25519/Extensions.cs
+++ b/Ed25519/Extensions.cs
@@ -120,5 +120,10 @@ namespace Ed25519
             var bigA = Constants.B.ScalarMul(a);
             return bigA.EncodePoint();
         }
+
+        public static ReadOnlySpan<byte> ExtractPublicKey(this Span<byte> privateKey)
+        {
+            return new ReadOnlySpan<byte>(privateKey.ToArray()).ExtractPublicKey();
+        }
     }
 }