From f7a152b871cb1c70e4a049954176fd9b345798be Mon Sep 17 00:00:00 2001
From: v2ray <admin@v2ray.com>
Date: Tue, 12 Jan 2016 13:39:02 +0100
Subject: [PATCH] remove unnecessary memory allocation in id generation

---
 proxy/vmess/id.go | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/proxy/vmess/id.go b/proxy/vmess/id.go
index d40f5b7e..afc51ff1 100644
--- a/proxy/vmess/id.go
+++ b/proxy/vmess/id.go
@@ -33,18 +33,15 @@ func (this *ID) UUID() *uuid.UUID {
 	return this.uuid
 }
 
+func (v ID) CmdKey() []byte {
+	return v.cmdKey[:]
+}
+
 func NewID(uuid *uuid.UUID) *ID {
+	id := &ID{uuid: uuid}
 	md5hash := md5.New()
 	md5hash.Write(uuid.Bytes())
 	md5hash.Write([]byte("c48619fe-8f02-49e0-b9e9-edf763e17e21"))
-	cmdKey := md5.Sum(nil)
-
-	return &ID{
-		uuid:   uuid,
-		cmdKey: cmdKey,
-	}
-}
-
-func (v ID) CmdKey() []byte {
-	return v.cmdKey[:]
+	md5.Sum(id.cmdKey[:0])
+	return id
 }