mirror of
https://gogs.blitter.com/RLabs/xs
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168 lines
4.3 KiB
Go
168 lines
4.3 KiB
Go
/* Herradura - a Key exchange scheme in the style of Diffie-Hellman Key Exchange.
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Copyright (C) 2017 Omar Alejandro Herrera Reyna
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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golang implementation by Russ Magee (rmagee_at_gmail.com) */
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package herradurakex
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// Implementation of HKEx-wrapped versions of the golang standard
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// net package interfaces, allowing clients and servers to simply replace
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// 'net.Dial', 'net.Listen' etc. with 'hkex.Dial', 'hkex.Listen' and so
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// forth.
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import (
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"bytes"
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"crypto/cipher"
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"fmt"
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"math/big"
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"net"
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)
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/*---------------------------------------------------------------------*/
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type Conn struct {
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c net.Conn // which also implements io.Reader, io.Writer, ...
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h *HerraduraKEx
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r cipher.Stream
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w cipher.Stream
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}
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// Dial as net.Dial(), but with implicit HKEx PeerD read on connect
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func Dial(protocol string, ipport string) (hc *Conn, err error) {
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c, err := net.Dial(protocol, ipport)
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if err != nil {
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return nil, err
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}
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hc = &Conn{c, New(0, 0), nil, nil}
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fmt.Fprintf(c, "0x%s\n", hc.h.d.Text(16))
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d := big.NewInt(0)
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_, err = fmt.Fscanln(c, d)
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if err != nil {
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return nil, err
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}
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hc.h.PeerD = d
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fmt.Printf("** D:%s\n", hc.h.d.Text(16))
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fmt.Printf("**(c)** peerD:%s\n", hc.h.PeerD.Text(16))
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hc.h.FA()
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fmt.Printf("**(c)** FA:%s\n", hc.h.fa)
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hc.r = hc.getStream(hc.h.fa, 0x0)
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hc.w = hc.getStream(hc.h.fa, 0x0)
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return
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}
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func (hc *Conn) Close() (err error) {
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err = hc.c.Close()
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fmt.Println("[Conn Closing]")
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return
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}
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/*---------------------------------------------------------------------*/
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type HKExListener struct {
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l net.Listener
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}
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func Listen(protocol string, ipport string) (hl HKExListener, e error) {
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l, err := net.Listen(protocol, ipport)
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if err != nil {
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return HKExListener{nil}, err
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}
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fmt.Println("[Listening]")
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hl.l = l
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return
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}
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func (hl *HKExListener) Close() {
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hl.l.Close()
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fmt.Println("[Listener Closed]")
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}
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func (hl *HKExListener) Accept() (hc Conn, err error) {
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c, err := hl.l.Accept()
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fmt.Println("[Accepted]")
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if err != nil {
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return Conn{nil, nil, nil, nil}, err
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}
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hc = Conn{c: c, h: New(0, 0), r: nil, w: nil}
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d := big.NewInt(0)
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_, err = fmt.Fscanln(c, d)
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if err != nil {
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fmt.Println("[Error]")
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return hc, err
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}
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hc.h.PeerD = d
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fmt.Printf("** D:%s\n", hc.h.d.Text(16))
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fmt.Printf("**(s)** peerD:%s\n", hc.h.PeerD.Text(16))
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hc.h.FA()
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fmt.Printf("**(s)** FA:%s\n", hc.h.fa)
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fmt.Fprintf(c, "0x%s\n", hc.h.d.Text(16))
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hc.r = hc.getStream(hc.h.fa, 0x0)
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hc.w = hc.getStream(hc.h.fa, 0x0)
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return
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}
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/*---------------------------------------------------------------------*/
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func (hc Conn) Read(b []byte) (n int, err error) {
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fmt.Printf("[Decrypting...]\n")
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n, err = hc.c.Read(b)
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if err != nil && err.Error() != "EOF" {
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panic(err)
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}
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if n > 0 {
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fmt.Printf(" ctext:%+v\n", b[:n])
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db := bytes.NewBuffer(b[:n])
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rs := &cipher.StreamReader{S: hc.r, R: db}
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n, err = rs.Read(b)
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fmt.Printf(" ptext:%+v\n", b[:n])
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}
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return
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}
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func (hc Conn) Write(b []byte) (n int, err error) {
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fmt.Printf("[Encrypting...]\n")
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fmt.Printf(" ptext:%+v\n", b)
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var wb bytes.Buffer
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ws := &cipher.StreamWriter{S: hc.w, W: &wb}
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n, err = ws.Write(b)
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fmt.Printf(" ctext:%+v\n", wb.Bytes())
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n, err = hc.c.Write(wb.Bytes())
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return
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}
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// Return c coerced into a HKEx Conn (which implements interface net.Conn)
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// Only useful if one wants to convert an open connection later to HKEx
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// (Use Dial() instead to start with HKEx automatically.)
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func NewHKExConn(c *net.Conn) (hc *Conn) {
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hc = new(Conn)
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hc.c = *c
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hc.h = New(0, 0)
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d := big.NewInt(0)
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_, err := fmt.Fscanln(hc.c, d)
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if err != nil {
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//
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}
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hc.h.PeerD = d
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fmt.Printf("** D:%s\n", hc.h.d.Text(16))
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fmt.Printf("** peerD:%s\n", hc.h.PeerD.Text(16))
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return
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}
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