diff --git a/util/stringutils/stringutils.go b/util/stringutils/stringutils.go
index 460c656..c38f70f 100644
--- a/util/stringutils/stringutils.go
+++ b/util/stringutils/stringutils.go
@@ -95,3 +95,22 @@ func ContainsWord(str, w string) bool {
 	reg := regexp.MustCompile(fmt.Sprintf("\\b%s\\b", w))
 	return reg.MatchString(str)
 }
+
+func byte2hex(b byte) byte {
+	if b >= 0 && b <= 9 {
+		return b + 0x30
+	}
+	if b >= 10 && b <= 15 {
+		return b - 10 + 0x61
+	}
+	return '?'
+}
+
+func Bytes2Str(b []byte) string {
+	buf := strings.Builder{}
+	for i := range b {
+		buf.WriteByte(byte2hex((b[i] & 0xf0) >> 4))
+		buf.WriteByte(byte2hex(b[i] & 0x0f))
+	}
+	return buf.String()
+}
diff --git a/util/stringutils/stringutils_test.go b/util/stringutils/stringutils_test.go
index 6a985ec..f790712 100644
--- a/util/stringutils/stringutils_test.go
+++ b/util/stringutils/stringutils_test.go
@@ -163,3 +163,29 @@ func TestContainsWord(t *testing.T) {
 		}
 	}
 }
+
+func TestByte2Str(t *testing.T) {
+	cases := []struct {
+		in []byte
+		want string
+	}{
+		{
+			in: []byte{0x00},
+			want: "00",
+		},
+		{
+			in: []byte{0x00, 0xff},
+			want: "00ff",
+		},
+		{
+			in: []byte{0xfe, 0x80, 0x00, 0x00},
+			want: "fe800000",
+		},
+	}
+	for _, c := range cases {
+		got := Bytes2Str(c.in)
+		if got != c.want {
+			t.Errorf("got %s want %s", got, c.want)
+		}
+	}
+}