wireguard-go/device/keypair.go

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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2020 WireGuard LLC. All Rights Reserved.
*/
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package device
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import (
"crypto/cipher"
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"sync"
"sync/atomic"
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"time"
"unsafe"
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"golang.zx2c4.com/wireguard/replay"
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)
/* Due to limitations in Go and /x/crypto there is currently
* no way to ensure that key material is securely ereased in memory.
*
* Since this may harm the forward secrecy property,
* we plan to resolve this issue; whenever Go allows us to do so.
*/
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type Keypair struct {
sendNonce uint64 // accessed atomically
send cipher.AEAD
receive cipher.AEAD
replayFilter replay.Filter
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isInitiator bool
created time.Time
localIndex uint32
remoteIndex uint32
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}
type Keypairs struct {
sync.RWMutex
current *Keypair
previous *Keypair
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next *Keypair
}
func (kp *Keypairs) storeNext(next *Keypair) {
atomic.StorePointer((*unsafe.Pointer)((unsafe.Pointer)(&kp.next)), (unsafe.Pointer)(next))
}
func (kp *Keypairs) loadNext() *Keypair {
return (*Keypair)(atomic.LoadPointer((*unsafe.Pointer)((unsafe.Pointer)(&kp.next))))
}
func (kp *Keypairs) Current() *Keypair {
kp.RLock()
defer kp.RUnlock()
return kp.current
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}
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func (device *Device) DeleteKeypair(key *Keypair) {
if key != nil {
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device.indexTable.Delete(key.localIndex)
}
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}