Cleanup / temp buffers for various things

peer/on_multicast.go

@@ -23,8 +23,9 @@ func (a *App) onMulticastDiscovery(pkt multicast.Packet) {
 		return
 	}
 
-	// Authenticate the beacon against the peer's known sign key.
-	if !pkt.Verify(a.mcVerifyBuf, &peer.SignPubKey) {
+	// Authenticate the beacon against the peer's known sign key. scratch[:0]
+	// gives sign.Open an empty-but-capacity buffer to decode into.
+	if !pkt.Verify(a.scratch[:0], &peer.SignPubKey) {
 		return
 	}