Support obfuscated2

mtglib/internal/obfuscated2/conn.go

@@ -0,0 +1,33 @@
+package obfuscated2
+
+import (
+	"crypto/cipher"
+	"net"
+)
+
+type Conn struct {
+	net.Conn
+
+	Encryptor cipher.Stream
+	Decryptor cipher.Stream
+
+	writeBuf []byte
+}
+
+func (c *Conn) Read(p []byte) (int, error) {
+	n, err := c.Conn.Read(p)
+	if err != nil {
+		return n, err // nolint: wrapcheck
+	}
+
+	c.Decryptor.XORKeyStream(p, p[:n])
+
+	return n, nil
+}
+
+func (c *Conn) Write(p []byte) (int, error) {
+	c.writeBuf = append(c.writeBuf[:0], p...)
+	c.Encryptor.XORKeyStream(c.writeBuf, c.writeBuf)
+
+	return c.Conn.Write(c.writeBuf)
+}