diff --git a/index.js b/index.js
index f7205e2..6c66d25 100644
--- a/index.js
+++ b/index.js
@@ -133,6 +133,14 @@ module.exports = {
     return num
   },
 
+  hash (data, { hasher = 'sha256', salt, input = 'utf8', output = 'hex' } = {}) {
+    if (typeof data !== 'string' && !(data instanceof Buffer) && !(data instanceof DataView)) data = JSON.stringify(data)
+    if (salt && typeof salt === 'string') data = data + salt
+    const inputEncoding = input // my.INPUT_LIST.indexOf(option.input)>=0?option.input:my.INPUT // 'utf8', 'ascii' or 'latin1' for string data, default to utf8 if not specified; ignored for Buffer, TypedArray, or DataView.
+    const outputEncoding = output === 'buf' ? undefined : output // (my.OUTPUT_LIST.indexOf(output)>=0?output:my.OUTPUT)  // option.output: 留空=》默认输出hex格式；或者手动指定 'buf', hex', 'latin1' or 'base64'
+    return require('crypto').createHash(hasher).update(data, inputEncoding).digest(outputEncoding)
+  },
+
   /**
    * 用户编号转邀请码
    *