diff --git a/binary/tea.go b/binary/tea.go
index 005f4ca1..34c22863 100644
--- a/binary/tea.go
+++ b/binary/tea.go
@@ -17,9 +17,7 @@ func isZero(a []byte) bool { // MAGIC
 	return *(*uint64)(unsafe.Pointer((*reflect.SliceHeader)(unsafe.Pointer(&a)).Data)) == 0
 }
 
-type TEA struct {
-	key [4]uint32
-}
+type TEA [4]uint32
 
 // http://bbs.chinaunix.net/thread-583468-1-1.html
 // 感谢xichen大佬对TEA的解释
@@ -138,8 +136,8 @@ var sumTable = [0x10]uint32{
 func (t *TEA) encode(src, dst []byte) {
 	v0, v1 := unpack(src)
 	for i := 0; i < 0x10; i++ {
-		v0 += ((v1 << 4) + t.key[0]) ^ (v1 + sumTable[i]) ^ ((v1 >> 5) + t.key[1])
-		v1 += ((v0 << 4) + t.key[2]) ^ (v0 + sumTable[i]) ^ ((v0 >> 5) + t.key[3])
+		v0 += ((v1 << 4) + t[0]) ^ (v1 + sumTable[i]) ^ ((v1 >> 5) + t[1])
+		v1 += ((v0 << 4) + t[2]) ^ (v0 + sumTable[i]) ^ ((v0 >> 5) + t[3])
 	}
 	repack(dst, v0, v1)
 }
@@ -149,8 +147,8 @@ func (t *TEA) encode(src, dst []byte) {
 func (t *TEA) decode(src, dst []byte) {
 	v0, v1 := unpack(src)
 	for i := 0xf; i >= 0; i-- {
-		v1 -= ((v0 << 4) + t.key[2]) ^ (v0 + sumTable[i]) ^ ((v0 >> 5) + t.key[3])
-		v0 -= ((v1 << 4) + t.key[0]) ^ (v1 + sumTable[i]) ^ ((v1 >> 5) + t.key[1])
+		v1 -= ((v0 << 4) + t[2]) ^ (v0 + sumTable[i]) ^ ((v0 >> 5) + t[3])
+		v0 -= ((v1 << 4) + t[0]) ^ (v1 + sumTable[i]) ^ ((v1 >> 5) + t[1])
 	}
 	repack(dst, v0, v1)
 }
@@ -161,9 +159,9 @@ func NewTeaCipher(key []byte) *TEA {
 		return nil
 	}
 	t := new(TEA)
-	t.key[3] = binary.BigEndian.Uint32(key[12:])
-	t.key[2] = binary.BigEndian.Uint32(key[8:])
-	t.key[1] = binary.BigEndian.Uint32(key[4:])
-	t.key[0] = binary.BigEndian.Uint32(key[0:])
+	t[3] = binary.BigEndian.Uint32(key[12:])
+	t[2] = binary.BigEndian.Uint32(key[8:])
+	t[1] = binary.BigEndian.Uint32(key[4:])
+	t[0] = binary.BigEndian.Uint32(key[0:])
 	return t
 }
diff --git a/binary/utils.go b/binary/utils.go
index dfa95bb3..5cce5fd6 100644
--- a/binary/utils.go
+++ b/binary/utils.go
@@ -6,10 +6,9 @@ import (
 	"compress/zlib"
 	binary2 "encoding/binary"
 	"encoding/hex"
-	"fmt"
+	"github.com/Mrs4s/MiraiGo/utils"
 	"io"
 	"net"
-	"strings"
 )
 
 func ZlibUncompress(src []byte) []byte {
@@ -47,24 +46,40 @@ func GZipUncompress(src []byte) []byte {
 }
 
 func CalculateImageResourceId(md5 []byte) string {
-	return strings.ToUpper(fmt.Sprintf(
-		"{%s}.png", GenUUID(md5),
-	))
+	id := make([]byte, 36+6)[:0]
+	id = append(id, '{')
+	AppendUUID(id[1:], md5)
+	id = id[:37]
+	id = append(id, "}.png"...)
+	return utils.B2S(bytes.ToUpper(id))
+
 }
 
-func GenUUID(uuid []byte) string {
-	u := uuid[0:16]
-	buf := make([]byte, 36)
-	hex.Encode(buf[0:], u[0:4])
-	buf[8] = '-'
-	hex.Encode(buf[9:], u[4:6])
-	buf[13] = '-'
-	hex.Encode(buf[14:], u[6:8])
-	buf[18] = '-'
-	hex.Encode(buf[19:], u[8:10])
-	buf[23] = '-'
-	hex.Encode(buf[24:], u[10:16])
-	return string(buf)
+func GenUUID(uuid []byte) []byte {
+	return AppendUUID(nil, uuid)
+}
+
+func AppendUUID(dst []byte, uuid []byte) []byte {
+	_ = uuid[15]
+	if cap(dst) > 36 {
+		dst = dst[:36]
+		dst[8] = '-'
+		dst[13] = '-'
+		dst[18] = '-'
+		dst[23] = '-'
+	} else { // Need Grow
+		dst = append(dst, "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"...)
+	}
+	hex.Encode(dst[0:], uuid[0:4])
+	hex.Encode(dst[9:], uuid[4:6])
+	hex.Encode(dst[14:], uuid[6:8])
+	hex.Encode(dst[19:], uuid[8:10])
+	hex.Encode(dst[24:], uuid[10:16])
+	return dst
+}
+
+func genUUID(uuid []byte, dst []byte) {
+
 }
 
 func ToIPV4Address(arr []byte) string {
diff --git a/client/global.go b/client/global.go
index 89e66ef4..24f717cb 100644
--- a/client/global.go
+++ b/client/global.go
@@ -173,7 +173,7 @@ func GenRandomDevice() {
 	rand.Read(r)
 	SystemDeviceInfo.Display = []byte("MIRAI." + utils.RandomStringRange(6, NumberRange) + ".001")
 	SystemDeviceInfo.FingerPrint = []byte("mamoe/mirai/mirai:10/MIRAI.200122.001/" + utils.RandomStringRange(7, NumberRange) + ":user/release-keys")
-	SystemDeviceInfo.BootId = []byte(binary.GenUUID(r))
+	SystemDeviceInfo.BootId = binary.GenUUID(r)
 	SystemDeviceInfo.ProcVersion = []byte("Linux version 3.0.31-" + utils.RandomString(8) + " (android-build@xxx.xxx.xxx.xxx.com)")
 	rand.Read(r)
 	t := md5.Sum(r)