diff --git a/package.json b/package.json
index 6692fb0..39a3611 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "crypto.js",
-  "version": "3.2.1",
+  "version": "3.2.2",
   "description": "原生crypto加密模块的二次封装,简化常用加密函数的使用",
   "keywords": [
     "md5",
diff --git a/src/index.js b/src/index.js
index 230bf0e..ea46066 100644
--- a/src/index.js
+++ b/src/index.js
@@ -27,7 +27,7 @@ const MAC = (function (ns) {
   return Math.random().toString(16).slice(-4)
 })(os.networkInterfaces())
 
-var __inc__ = 4096
+let __inc__ = 4096
 
 /**
  * [base64encode base64编码]
@@ -35,7 +35,7 @@ var __inc__ = 4096
  * @param  {bool} urlFriendly [是否对URL友好, 默认否, 是则会把+转成-, /转成_]
  */
 export function base64encode(str, urlFriendly) {
-  var buf, str64
+  let buf, str64
 
   if (Buffer.isBuffer(str)) {
     buf = str
@@ -86,8 +86,8 @@ export function rand(len, forceNum) {
 
 // 返回一个如下格式的 xxxxxxxx-xxxx-xxxx-xxxxxxxx 的唯一ID
 export function uuid(pipe = '-') {
-  var str = crypto.randomUUID()
-  var now = (~~(Date.now() / 1000)).toString(16)
+  let str = crypto.randomUUID()
+  let now = (~~(Date.now() / 1000)).toString(16)
 
   if (__inc__ > 65535) {
     __inc__ = 4096
@@ -121,11 +121,12 @@ export function md5(str, encode) {
  * @param  {Str} file [文件路径]
  */
 export function md5Sign(file) {
-  if (fs.accessSync(file, fs.constants.R_OK)) {
-    var buf = fs.readFileSync(file)
+  try {
+    let buf = fs.readFileSync(file)
     return hash('md5', buf)
+  } catch (e) {
+    return null
   }
-  return null
 }
 
 /**
@@ -149,11 +150,12 @@ export function sha1(str, encode) {
  * @param  {Str} file [文件路径]
  */
 export function sha1Sign(file) {
-  if (fs.accessSync(file, fs.constants.R_OK)) {
-    var buf = fs.readFileSync(file)
+  try {
+    let buf = fs.readFileSync(file)
     return hash('sha1', buf)
+  } catch (e) {
+    return null
   }
-  return null
 }
 
 /**
@@ -177,11 +179,12 @@ export function sha256(str, encoding) {
  * @param  {Str} file [文件路径]
  */
 export function sha256Sign(file) {
-  if (fs.accessSync(file, fs.constants.R_OK)) {
-    var buf = fs.readFileSync(file)
+  try {
+    let buf = fs.readFileSync(file)
     return hash('sha256', buf)
+  } catch (e) {
+    return null
   }
-  return null
 }
 
 export {