Esempio n. 1
0
File: tcp.go Progetto: cirias/myvpn
func (conn *TCPConn) ReadIPPacket(b []byte) (n int, err error) {
	ivheader := make([]byte, cipher.IVSize+IPHeaderSize)
	if _, err = io.ReadFull(conn, ivheader); err != nil {
		glog.V(3).Infoln("fail to read iv and encrypted header", err)
		return
	}
	dec := cipher.NewDecrypter(conn.cipher, ivheader[:cipher.IVSize])
	dec.Decrypt(b[:IPHeaderSize], ivheader[cipher.IVSize:])

	n = int(binary.BigEndian.Uint16(b[2:4]))
	payload := make([]byte, n-IPHeaderSize)
	if _, err = io.ReadFull(conn, payload); err != nil {
		glog.V(3).Infoln("fail to read encrypted payload", err)
		return
	}
	dec.Decrypt(b[IPHeaderSize:n], payload)

	return
}
Esempio n. 2
0
File: tcp.go Progetto: cirias/myvpn
func recieve(cph *cipher.Cipher, tcpConn net.Conn, data interface{}) (err error) {
	iv := make([]byte, cipher.IVSize)
	if _, err = io.ReadFull(tcpConn, iv); err != nil {
		glog.V(3).Infoln("fail to read iv", err)
		return
	}
	dec := cipher.NewDecrypter(cph, iv)
	encrypted := make([]byte, binary.Size(data))
	if _, err = io.ReadFull(tcpConn, encrypted); err != nil {
		glog.V(3).Infoln("fail to read encrypted data", err)
		return
	}
	decrypted := make([]byte, len(encrypted))
	dec.Decrypt(decrypted, encrypted)
	if err = binary.Read(bytes.NewBuffer(decrypted), binary.BigEndian, data); err != nil {
		glog.V(3).Infoln("fail to unmarshal data", err)
		return
	}
	glog.V(3).Infoln("data recieved", data)
	return
}