diff --git a/utils.js b/utils.js
index 15d7932..ad08852 100644
--- a/utils.js
+++ b/utils.js
@@ -205,6 +205,11 @@ function md5Str(data) {
   return hash.update(data).digest('hex');
 }
 
+function sha1Str(data) {
+  const hash = crypto.createHash('sha1');
+  return hash.update(data).digest('hex');
+}
+
 function getVal(obj, key, defVal = null) {
   if (!obj){
     return val;
@@ -360,6 +365,7 @@ exports.extractRegisterTime = extractRegisterTime;
 exports.createSessionId = createSessionId;
 exports.isValidSessionId = isValidSessionId;
 exports.md5Str = md5Str;
+exports.sha1Str = sha1Str;
 exports.getVal = getVal;
 exports.excelToJson = excelToJson;
 exports.getArgv = getArgv;