prototype of vpndialer

common/crypto/auth.go

@@ -60,6 +60,13 @@ func (v *AEADAuthenticator) Seal(dst, plainText []byte) ([]byte, error) {
 	return v.AEAD.Seal(dst, iv, plainText, additionalData), nil
 }
 
+type StreamMode int
+
+const (
+	ModeStream StreamMode = iota
+	ModePacket
+)
+
 type AuthenticationReader struct {
 	auth       Authenticator
 	buffer     *buf.Buffer

common/serial/bytes.go

@@ -20,6 +20,13 @@ func BytesToUint32(value []byte) uint32 {
 		uint32(value[3])
 }
 
+func BytesToInt(value []byte) int {
+	return int(value[0])<<24 |
+		int(value[1])<<16 |
+		int(value[2])<<8 |
+		int(value[3])
+}
+
 // BytesToInt64 deserializes a byte array to an int64 in big endian order. The byte array must have at least 8 elements.
 func BytesToInt64(value []byte) int64 {
 	return int64(value[0])<<56 |