snow/wireguard-go
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send: more precise padding calculation

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This commit is contained in:
Jason A. Donenfeld 2018-09-16 23:42:31 +02:00
parent 47d1140361
commit 942abf948a
1 changed files with 7 additions and 5 deletions
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10
send.go
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@ -488,11 +488,13 @@ func (device *Device) RoutineEncryption() {
// pad content to multiple of 16
mtu := int(atomic.LoadInt32(&device.tun.mtu))
rem := len(elem.packet) % PaddingMultiple
if rem > 0 {
for i := 0; i < PaddingMultiple-rem && len(elem.packet) < mtu; i++ {
elem.packet = append(elem.packet, 0)
lastUnit := len(elem.packet) % mtu
paddedSize := (lastUnit + PaddingMultiple - 1) & ^(PaddingMultiple - 1)
if paddedSize > mtu {
paddedSize = mtu
}
for i := len(elem.packet); i < paddedSize; i++ {
elem.packet = append(elem.packet, 0)
}
// encrypt content and release to consumer