diff --git a/proxy/socks/protocol/socks_fuzz_test.go b/proxy/socks/protocol/socks_fuzz_test.go
index d8ed17686..05c27e1c2 100644
--- a/proxy/socks/protocol/socks_fuzz_test.go
+++ b/proxy/socks/protocol/socks_fuzz_test.go
@@ -1,8 +1,9 @@
 package protocol
 
 import (
-	"crypto/rand"
 	"testing"
+
+	"github.com/v2ray/v2ray-core/testing/fuzzing"
 )
 
 const (
@@ -11,18 +12,18 @@ const (
 
 func TestReadAuthentication(t *testing.T) {
 	for i := 0; i < Iterations; i++ {
-		ReadAuthentication(rand.Reader)
+		ReadAuthentication(fuzzing.RandomReader())
 	}
 }
 
 func TestReadUserPassRequest(t *testing.T) {
 	for i := 0; i < Iterations; i++ {
-		ReadUserPassRequest(rand.Reader)
+		ReadUserPassRequest(fuzzing.RandomReader())
 	}
 }
 
 func TestReadRequest(t *testing.T) {
 	for i := 0; i < Iterations; i++ {
-		ReadRequest(rand.Reader)
+		ReadRequest(fuzzing.RandomReader())
 	}
 }
diff --git a/proxy/vmess/protocol/vmess_fuzz_test.go b/proxy/vmess/protocol/vmess_fuzz_test.go
index 83bb086b5..2a4688138 100644
--- a/proxy/vmess/protocol/vmess_fuzz_test.go
+++ b/proxy/vmess/protocol/vmess_fuzz_test.go
@@ -1,15 +1,15 @@
 package protocol
 
 import (
-	"crypto/rand"
 	"testing"
 
 	"github.com/v2ray/v2ray-core/proxy/vmess/protocol/user/testing/mocks"
+	"github.com/v2ray/v2ray-core/testing/fuzzing"
 )
 
 func TestVMessRequestReader(t *testing.T) {
 	reader := NewVMessRequestReader(&mocks.StaticUserSet{})
 	for i := 0; i < 10000000; i++ {
-		reader.Read(rand.Reader)
+		reader.Read(fuzzing.RandomReader())
 	}
 }
diff --git a/testing/fuzzing/fuzzing.go b/testing/fuzzing/fuzzing.go
new file mode 100644
index 000000000..64d71dcde
--- /dev/null
+++ b/testing/fuzzing/fuzzing.go
@@ -0,0 +1,17 @@
+package fuzzing
+
+import (
+	"bytes"
+	"crypto/rand"
+	"io"
+)
+
+func RandomBytes() []byte {
+	buffer := make([]byte, 256)
+	rand.Read(buffer)
+	return buffer[1 : 1+int(buffer[0])]
+}
+
+func RandomReader() io.Reader {
+	return bytes.NewReader(RandomBytes())
+}