chore: use fastrand to replace math/rand

transport/simple-obfs/http.go

@@ -5,11 +5,12 @@ import (
 	"encoding/base64"
 	"fmt"
 	"io"
-	"math/rand"
 	"net"
 	"net/http"
 
 	"github.com/Dreamacro/clash/common/pool"
+
+	"github.com/zhangyunhao116/fastrand"
 )
 
 // HTTPObfs is shadowsocks http simple-obfs implementation
@@ -63,9 +64,9 @@ func (ho *HTTPObfs) Read(b []byte) (int, error) {
 func (ho *HTTPObfs) Write(b []byte) (int, error) {
 	if ho.firstRequest {
 		randBytes := make([]byte, 16)
-		rand.Read(randBytes)
+		fastrand.Read(randBytes)
 		req, _ := http.NewRequest("GET", fmt.Sprintf("http://%s/", ho.host), bytes.NewBuffer(b[:]))
-		req.Header.Set("User-Agent", fmt.Sprintf("curl/7.%d.%d", rand.Int()%54, rand.Int()%2))
+		req.Header.Set("User-Agent", fmt.Sprintf("curl/7.%d.%d", fastrand.Int()%54, fastrand.Int()%2))
 		req.Header.Set("Upgrade", "websocket")
 		req.Header.Set("Connection", "Upgrade")
 		req.Host = ho.host

transport/simple-obfs/tls.go

@@ -4,16 +4,13 @@ import (
 	"bytes"
 	"encoding/binary"
 	"io"
-	"math/rand"
 	"net"
 	"time"
 
 	"github.com/Dreamacro/clash/common/pool"
-)
 
-func init() {
-	rand.Seed(time.Now().Unix())
-}
+	"github.com/zhangyunhao116/fastrand"
+)
 
 const (
 	chunkSize = 1 << 14 // 2 ** 14 == 16 * 1024
@@ -130,8 +127,8 @@ func NewTLSObfs(conn net.Conn, server string) net.Conn {
 func makeClientHelloMsg(data []byte, server string) []byte {
 	random := make([]byte, 28)
 	sessionID := make([]byte, 32)
-	rand.Read(random)
-	rand.Read(sessionID)
+	fastrand.Read(random)
+	fastrand.Read(sessionID)
 
 	buf := &bytes.Buffer{}