"golang.org/x/crypto/blake2b"
)
-const (
- IDSize = 128 / 8
-)
+// IDSize is size a GoVPN peer ID must be
+const IDSize = 128 / 8
+// PeerID is identifier of a single GoVPN peer (client)
type PeerID [IDSize]byte
+// String return a string from a peer ID
func (id PeerID) String() string {
return base64.RawStdEncoding.EncodeToString(id[:])
}
+// MarshalJSON return a JSON string from a peer ID
func (id PeerID) MarshalJSON() ([]byte, error) {
return []byte(`"` + id.String() + `"`), nil
}
+// MACAndTimeSync is a single peer MAC and timesync
type MACAndTimeSync struct {
mac hash.Hash
ts int
l sync.Mutex
}
+// MACCache cache all MACAndTimeSync for peers allowed to connect
type MACCache struct {
cache map[PeerID]*MACAndTimeSync
l sync.RWMutex
}
+// NewMACCache return a new MACCache instance
func NewMACCache() *MACCache {
return &MACCache{cache: make(map[PeerID]*MACAndTimeSync)}
}
-// Remove disappeared keys, add missing ones with initialized MACs.
+// Update remove disappeared keys, add missing ones with initialized MACs.
func (mc *MACCache) Update(peers *map[PeerID]*PeerConf) {
mc.l.Lock()
for pid := range mc.cache {
mc.l.Unlock()
}
-// If timeSync > 0, then XOR timestamp with the data.
+// AddTimeSync XOR timestamp with data if timeSync > 0
func AddTimeSync(ts int, data []byte) {
if ts == 0 {
return
}
}
-// Try to find peer's identity (that equals to MAC)
+// Find try to find peer's identity (that equals to MAC)
// by taking first blocksize sized bytes from data at the beginning
// as plaintext and last bytes as cyphertext.
func (mc *MACCache) Find(data []byte) *PeerID {