Align 64-bit atomics

64-bit varibles that are accessed using the Go atomic functions must be
8-byte aligned on 32-bit platforms. Otherwise there are crashes.

keypair.go

@@ -14,10 +14,10 @@ import (
  */
 
 type KeyPair struct {
+	sendNonce    uint64
 	send         cipher.AEAD
 	receive      cipher.AEAD
 	replayFilter ReplayFilter
-	sendNonce    uint64
 	isInitiator  bool
 	created      time.Time
 	localIndex   uint32

peer.go

@@ -13,9 +13,9 @@ const (
 )
 
 type Peer struct {
+	persistentKeepaliveInterval uint64
 	isRunning                   AtomicBool
 	mutex                       sync.RWMutex
-	persistentKeepaliveInterval uint64
 	keyPairs                    KeyPairs
 	handshake                   Handshake
 	device                      *Device