123

 <?php
+
 namespace lib;
 
 class WXBizDataCrypt
 {
+
     private $appid;
     private $sessionKey;
 
@@ -11,8 +13,9 @@ class WXBizDataCrypt
      * @param $sessionKey string 用户在小程序登录后获取的会话密钥
      * @param $appid string 小程序的appid
      */
-    public function __construct( $appid, $sessionKey)
+    public function __construct($appid, $sessionKey)
     {
+
         $this->sessionKey = $sessionKey;
         $this->appid = $appid;
     }
@@ -26,42 +29,142 @@ class WXBizDataCrypt
      *
      * @return int 成功0，失败返回对应的错误码
      */
-    public function decryptData( $encryptedData, $iv, &$data )
+    public function decryptData($encryptedData, $iv, &$data)
     {
         if (strlen($this->sessionKey) != 24) {
             return ErrorCode::$IllegalAesKey;
         }
-        $aesKey=base64_decode($this->sessionKey);
+        $aesKey = base64_decode($this->sessionKey);
 
 
         if (strlen($iv) != 24) {
             return ErrorCode::$IllegalIv;
         }
-        $aesIV=base64_decode($iv);
+        $aesIV = base64_decode($iv);
 
-        $aesCipher=base64_decode($encryptedData);
+        $aesCipher = base64_decode($encryptedData);
 
-        $result=openssl_decrypt($aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);
+        $pc = new Prpcrypt($aesKey);
+        $result = $pc->decrypt($aesCipher, $aesIV);
 
-        $dataObj=json_decode($result);
-        print_r($aesCipher);
-        print_r("=======");
-        print_r($this->appid);
-        return;
-        if( $dataObj  == NULL )
-        {
-            return ErrorCode::$IllegalBuffer;
+        if ($result[0] != 0) {
+            return $result[0];
         }
-        if( $dataObj->watermark->appid != $this->appid )
-        {
 
+        $dataObj = json_decode($result[1]);
+        if ($dataObj == NULL) {
+            return ErrorCode::$IllegalBuffer;
+        }
+        if ($dataObj->watermark->appid != $this->appid) {
             return ErrorCode::$IllegalBuffer;
         }
-        $data = $result;
-        return  ErrorCode::$OK;
+        $data = $result[1];
+        return ErrorCode::$OK;
     }
 
 }
+
+/**
+ * PKCS7Encoder class
+ *
+ * 提供基于PKCS7算法的加解密接口.
+ */
+class PKCS7Encoder
+{
+    public static $block_size = 16;
+
+    /**
+     * 对需要加密的明文进行填充补位
+     * @param $text 需要进行填充补位操作的明文
+     * @return 补齐明文字符串
+     */
+    function encode($text)
+    {
+        $block_size = PKCS7Encoder::$block_size;
+        $text_length = strlen($text);
+        //计算需要填充的位数
+        $amount_to_pad = PKCS7Encoder::$block_size - ($text_length % PKCS7Encoder::$block_size);
+        if ($amount_to_pad == 0) {
+            $amount_to_pad = PKCS7Encoder::block_size;
+        }
+        //获得补位所用的字符
+        $pad_chr = chr($amount_to_pad);
+        $tmp = "";
+        for ($index = 0; $index < $amount_to_pad; $index++) {
+            $tmp .= $pad_chr;
+        }
+        return $text . $tmp;
+    }
+
+    /**
+     * 对解密后的明文进行补位删除
+     * @param decrypted 解密后的明文
+     * @return 删除填充补位后的明文
+     */
+    function decode($text)
+    {
+
+        $pad = ord(substr($text, -1));
+        if ($pad < 1 || $pad > 32) {
+            $pad = 0;
+        }
+        return substr($text, 0, (strlen($text) - $pad));
+    }
+
+}
+
+/**
+ * Prpcrypt class
+ *
+ *
+ */
+class Prpcrypt
+{
+    public $key;
+
+    function __construct($k)
+    {
+        $this->key = $k;
+    }
+
+    /**
+     * 对密文进行解密
+     * @param string $aesCipher 需要解密的密文
+     * @param string $aesIV 解密的初始向量
+     * @return string 解密得到的明文
+     */
+    public function decrypt($aesCipher, $aesIV)
+    {
+
+
+        try {
+
+            $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
+print_r($module);return;
+            mcrypt_generic_init($module, $this->key, $aesIV);
+
+            //解密
+            $decrypted = mdecrypt_generic($module, $aesCipher);
+            mcrypt_generic_deinit($module);
+            mcrypt_module_close($module);
+        } catch (Exception $e) {
+            return array(ErrorCode::$IllegalBuffer, null);
+        }
+
+
+        try {
+            //去除补位字符
+            $pkc_encoder = new PKCS7Encoder;
+            $result = $pkc_encoder->decode($decrypted);
+
+        } catch (Exception $e) {
+            //print $e;
+            return array(ErrorCode::$IllegalBuffer, null);
+        }
+        return array(0, $result);
+    }
+}
+
 class ErrorCode
 {
     public static $OK = 0;