From 00b53d39c3ec4a7609b4878f1ae83f6b2329b732 Mon Sep 17 00:00:00 2001
From: Joe Kyo <xunianzu@gmail.com>
Date: Mon, 16 Oct 2017 07:25:14 +0100
Subject: [PATCH] crypto/tls: remove bookkeeping code from pHash function

Since copy function can figure out how many bytes of data to copy when
two slices have different length, it is not necessary to check how many
bytes need to copy each time before copying the data.

Change-Id: I5151ddfe46af5575566fe9c9a2648e111575ec3d
Reviewed-on: https://go-review.googlesource.com/71090
Reviewed-by: Filippo Valsorda <hi@filippo.io>
Run-TryBot: Filippo Valsorda <hi@filippo.io>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
---
 prf.go | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/prf.go b/prf.go
index 27a22f1..d07be11 100644
--- a/prf.go
+++ b/prf.go
@@ -35,12 +35,8 @@ func pHash(result, secret, seed []byte, hash func() hash.Hash) {
 		h.Write(a)
 		h.Write(seed)
 		b := h.Sum(nil)
-		todo := len(b)
-		if j+todo > len(result) {
-			todo = len(result) - j
-		}
-		copy(result[j:j+todo], b)
-		j += todo
+		copy(result[j:], b)
+		j += len(b)
 
 		h.Reset()
 		h.Write(a)