diff --git a/WeMini/Crypt.php b/WeMini/Crypt.php
index ece1b01..c593176 100644
--- a/WeMini/Crypt.php
+++ b/WeMini/Crypt.php
@@ -15,8 +15,10 @@
 namespace WeMini;
 
 use WeChat\Contracts\BasicWeChat;
+use WeChat\Contracts\Tools;
+use WeChat\Exceptions\InvalidDecryptException;
+use WeChat\Exceptions\InvalidResponseException;
 
-require_once __DIR__ . DIRECTORY_SEPARATOR . 'crypt' . DIRECTORY_SEPARATOR . 'wxBizDataCrypt.php';
 
 /**
  * 数据加密处理
@@ -35,6 +37,7 @@ class Crypt extends BasicWeChat
      */
     public function decode($iv, $sessionKey, $encryptedData)
     {
+        require_once __DIR__ . DIRECTORY_SEPARATOR . 'crypt' . DIRECTORY_SEPARATOR . 'wxBizDataCrypt.php';
         $pc = new \WXBizDataCrypt($this->config->get('appid'), $sessionKey);
         $errCode = $pc->decryptData($encryptedData, $iv, $data);
         if ($errCode == 0) {
@@ -42,4 +45,39 @@ class Crypt extends BasicWeChat
         }
         return false;
     }
+
+    /**
+     * 登录凭证校验
+     * @param string $code 登录时获取的 code
+     * @return array
+     */
+    public function session($code)
+    {
+        $appid = $this->config->get('appid');
+        $secret = $this->config->get('appsecret');
+        $url = "https://api.weixin.qq.com/sns/jscode2session?appid={$appid}&secret={$secret}&js_code={$code}&grant_type=authorization_code";
+        return json_decode(Tools::get($url), true);
+    }
+
+    /**
+     * 换取用户信息
+     * @param string $code 用户登录凭证（有效期五分钟）
+     * @param string $iv 加密算法的初始向量
+     * @param string $encryptedData 加密数据( encryptedData )
+     * @return array
+     * @throws InvalidDecryptException
+     * @throws InvalidResponseException
+     */
+    public function userInfo($code, $iv, $encryptedData)
+    {
+        $result = $this->session($code);
+        if (empty($result['session_key'])) {
+            throw new InvalidResponseException('Code换取SessionKey失败', 403);
+        }
+        $userinfo = $this->decode($iv, $result['session_key'], $encryptedData);
+        if (empty($userinfo)) {
+            throw  new InvalidDecryptException('用户信息解析失败', 403);
+        }
+        return array_merge($result, $userinfo);
+    }
 }
\ No newline at end of file
diff --git a/WeMini/crypt/wxBizDataCrypt.php b/WeMini/crypt/wxBizDataCrypt.php
index d253e96..43769f2 100644
--- a/WeMini/crypt/wxBizDataCrypt.php
+++ b/WeMini/crypt/wxBizDataCrypt.php
@@ -6,7 +6,6 @@
  * @copyright Copyright (c) 1998-2014 Tencent Inc.
  */
 
-include_once __DIR__ . DIRECTORY_SEPARATOR . "errorCode.php";
 
 class WXBizDataCrypt
 {
@@ -22,6 +21,7 @@ class WXBizDataCrypt
     {
         $this->appid = $appid;
         $this->sessionKey = $sessionKey;
+        include_once __DIR__ . DIRECTORY_SEPARATOR . "errorCode.php";
     }
 
     /**