57 lines
1.1 KiB
Go
57 lines
1.1 KiB
Go
package main
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import (
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"io"
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"net"
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)
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type ScrambleReadWriter struct {
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ReadWriter io.ReadWriter
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Key byte
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buffer []byte
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}
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func (s *ScrambleReadWriter) Read(p []byte) (n int, err error) {
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n, err = s.ReadWriter.Read(p)
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for i := 0; i < n; i++ {
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p[i] = p[i] ^ s.Key
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}
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return n, err
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}
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// Write takes buffer p, performs XOR in a copy of the buffer and calls write
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// on the underlying ReadWriter.
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func (s *ScrambleReadWriter) Write(p []byte) (n int, err error) {
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if cap(s.buffer) < cap(p) {
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s.buffer = make([]byte, 0, cap(p))
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} else {
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s.buffer = s.buffer[:0]
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}
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for i := range p {
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s.buffer = append(s.buffer, p[i]^s.Key)
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}
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return s.ReadWriter.Write(s.buffer)
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}
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type ScrambleConn struct {
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net.Conn
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*ScrambleReadWriter
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}
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func NewScrambleConn(c net.Conn, key byte) net.Conn {
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return &ScrambleConn{
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c,
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&ScrambleReadWriter{
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ReadWriter: c,
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Key: key,
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},
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}
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}
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func (s *ScrambleConn) Read(b []byte) (n int, err error) {
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return s.ScrambleReadWriter.Read(b)
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}
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func (s *ScrambleConn) Write(b []byte) (n int, err error) {
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return s.ScrambleReadWriter.Write(b)
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}
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