Fix handshake peer identification

[govpn.git] / src / cypherpunks.ru / govpn / identity.go

diff --git a/src/cypherpunks.ru/govpn/identity.go b/src/cypherpunks.ru/govpn/identity.go
index ece2dfcf0bb2131fd4c4a48c8467d39230728837..d738c5563e091179bd1e1fa287fb1bbcbd6ef1d9 100644 (file)
--- a/src/cypherpunks.ru/govpn/identity.go
+++ b/src/cypherpunks.ru/govpn/identity.go
@@ -1,6 +1,6 @@
 /*
 GoVPN -- simple secure free software virtual private network daemon
-Copyright (C) 2014-2016 Sergey Matveev <stargrave@stargrave.org>
+Copyright (C) 2014-2017 Sergey Matveev <stargrave@stargrave.org>
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -113,9 +113,9 @@ func (mc *MACCache) Find(data []byte) *PeerId {
                mt.l.Lock()
                mt.mac.Reset()
                mt.mac.Write(buf)
-               mt.mac.Sum(buf[:0])
+               sum := mt.mac.Sum(nil)
                mt.l.Unlock()
-               if subtle.ConstantTimeCompare(buf, data[len(data)-8:]) == 1 {
+               if subtle.ConstantTimeCompare(sum[len(sum)-8:], data[len(data)-8:]) == 1 {
                        ppid := PeerId(pid)
                        mc.l.RUnlock()
                        return &ppid