消除一个线程引起的bug

Signed-off-by: dmy@lab <dmy@lab.com>

tscipher/cipher.go

@@ -23,18 +23,23 @@ func NewCipher(cipherName string) (cipher Cipher) {
 		return NewAES()
 	}
 	if cipherName == "XOR" {
-		return NewXOR([]byte("fasdfasdf"))
+		return NewXOR([]byte("fasdfasdf!3297!jfsl12*&!HHHFds"))
 	}
 	return nil //TODO:临时这样处理
 }
 
 func SendData(carrier *Carrier, nByte int) (n int, err error) {
+	if carrier.Cipher == nil {
+		n, err = carrier.Conn.Write(carrier.Cache[:nByte])
+		return
+	}
 	encrypedByte, err := carrier.Cipher.Encrypt(carrier.Cache[:nByte])
 	if err != nil {
 		n = 0
 		return
 	}
 	n, err = carrier.Conn.Write(encrypedByte[:nByte])
+	copy(carrier.Cache, encrypedByte[:nByte]) // in case of debugging
 	return
 }
 
@@ -44,6 +49,9 @@ func ReceiveData(carrier *Carrier) (n int, err error) {
 		n = 0
 		return
 	}
+	if carrier.Cipher == nil {
+		return
+	}
 	decrypted, err := carrier.Cipher.Decrypt(carrier.Cache[:n])
 	copy(carrier.Cache, decrypted[:n])
 	if err != nil {