diff --git a/gold/link/crypto.go b/gold/link/crypto.go
index 299b7c5..57aa8fe 100644
--- a/gold/link/crypto.go
+++ b/gold/link/crypto.go
@@ -35,7 +35,7 @@ func (l *Link) Decode(teatype uint8, b []byte) (db []byte) {
 	return
 }
 
-// EncodePreshared 使用 chacha20poly1305 加密
+// EncodePreshared 使用 xchacha20poly1305 加密
 func (l *Link) EncodePreshared(additional uint16, b []byte) (eb []byte) {
 	nsz := l.aead.NonceSize()
 	// Select a random nonce, and leave capacity for the ciphertext.
@@ -51,7 +51,7 @@ func (l *Link) EncodePreshared(additional uint16, b []byte) (eb []byte) {
 	return
 }
 
-// DecodePreshared 使用 chacha20poly1305 解密
+// DecodePreshared 使用 xchacha20poly1305 解密
 func (l *Link) DecodePreshared(additional uint16, b []byte) (db []byte) {
 	nsz := l.aead.NonceSize()
 	if len(b) < nsz { // ciphertext too short
diff --git a/gold/link/send.go b/gold/link/send.go
index 298054d..a407358 100644
--- a/gold/link/send.go
+++ b/gold/link/send.go
@@ -60,18 +60,22 @@ func (l *Link) WriteAndPut(p *head.Packet, istransfer bool) (n int, err error) {
 
 func (l *Link) encrypt(p *head.Packet, sndcnt uint16, teatype uint8) {
 	p.FillHash()
+	logrus.Debugln("[send] data len before encrypt:", len(p.Data))
 	if l.usezstd {
 		w := helper.SelectWriter()
 		defer helper.PutWriter(w)
 		enc, _ := zstd.NewWriter(w, zstd.WithEncoderLevel(zstd.SpeedFastest))
-		defer enc.Close()
 		_, _ = io.Copy(enc, bytes.NewReader(p.Data))
+		enc.Close()
 		p.Data = w.Bytes()
+		logrus.Debugln("[send] data len after zstd:", len(p.Data))
 	}
 	if l.aead != nil {
 		p.Data = l.EncodePreshared(sndcnt, p.Data)
+		logrus.Debugln("[send] data len after xchacha20:", len(p.Data))
 	}
 	p.Data = l.Encode(teatype, p.Data)
+	logrus.Debugln("[send] data len after tea:", len(p.Data))
 }
 
 // write 向 peer 发一个包