From d6add122d84e95157e2d771e1d2a741afefc2eee Mon Sep 17 00:00:00 2001
From: Marten Seemann <martenseemann@gmail.com>
Date: Wed, 6 Nov 2019 12:40:47 +0700
Subject: [PATCH] update the label used for the key update derivation

---
 internal/handshake/updatable_aead.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/internal/handshake/updatable_aead.go b/internal/handshake/updatable_aead.go
index 2444bc50f..e7cdcaeb0 100644
--- a/internal/handshake/updatable_aead.go
+++ b/internal/handshake/updatable_aead.go
@@ -110,7 +110,7 @@ func (a *updatableAEAD) rollKeys(now time.Time) {
 }
 
 func (a *updatableAEAD) getNextTrafficSecret(hash crypto.Hash, ts []byte) []byte {
-	return qtls.HkdfExpandLabel(hash, ts, []byte{}, "traffic upd", hash.Size())
+	return qtls.HkdfExpandLabel(hash, ts, []byte{}, "quic ku", hash.Size())
 }
 
 // For the client, this function is called before SetWriteKey.