From 75049c81dc6aa9d2ca257c7b5c6b6f3f95af6c09 Mon Sep 17 00:00:00 2001
From: Gavin Foo <fuxiaopang@gmail.com>
Date: Wed, 30 Aug 2017 16:33:34 +0800
Subject: [PATCH] FIX "Function mcrypt_module_open() is deprecated in PHP 7.1"

---
 wechat.class.php | 136 +++++++++++++++++++----------------------------
 1 file changed, 55 insertions(+), 81 deletions(-)

diff --git a/wechat.class.php b/wechat.class.php
index b8b3644..6494e14 100755
--- a/wechat.class.php
+++ b/wechat.class.php
@@ -4645,89 +4645,63 @@ function Prpcrypt($k)
         $this->key = base64_decode($k . "=");
     }
 
-    /**
-     * 对明文进行加密
-     * @param string $text 需要加密的明文
-     * @return string 加密后的密文
-     */
-    public function encrypt($text, $appid)
-    {
-
-        try {
-            //获得16位随机字符串，填充到明文之前
-            $random = $this->getRandomStr();//"aaaabbbbccccdddd";
-            $text = $random . pack("N", strlen($text)) . $text . $appid;
-            // 网络字节序
-            $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
-            $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
-            $iv = substr($this->key, 0, 16);
-            //使用自定义的填充方式对明文进行补位填充
-            $pkc_encoder = new PKCS7Encoder;
-            $text = $pkc_encoder->encode($text);
-            mcrypt_generic_init($module, $this->key, $iv);
-            //加密
-            $encrypted = mcrypt_generic($module, $text);
-            mcrypt_generic_deinit($module);
-            mcrypt_module_close($module);
-
-            //			print(base64_encode($encrypted));
-            //使用BASE64对加密后的字符串进行编码
-            return array(ErrorCode::$OK, base64_encode($encrypted));
-        } catch (Exception $e) {
-            //print $e;
-            return array(ErrorCode::$EncryptAESError, null);
-        }
+  /**
+   * 对明文进行加密
+   * @param string $text 需要加密的明文
+   * @return string 加密后的密文
+   */
+  public function encrypt($text, $appid){
+    try {
+      //获得16位随机字符串，填充到明文之前
+      $random = $this->getRandomStr();
+      $text = $random . pack("N", strlen($text)) . $text . $appid;
+      $iv = substr($this->key, 0, 16);
+      $pkc_encoder = new PKCS7Encoder;
+      $text = $pkc_encoder->encode($text);
+      $encrypted = openssl_encrypt($text,'AES-256-CBC',substr($this->key, 0, 32),OPENSSL_ZERO_PADDING,$iv);
+      return array(ErrorCode::$OK, $encrypted);
+    } catch (Exception $e) {
+      //print $e;
+      return array(ErrorCode::$EncryptAESError, null);
     }
-
-    /**
-     * 对密文进行解密
-     * @param string $encrypted 需要解密的密文
-     * @return string 解密得到的明文
-     */
-    public function decrypt($encrypted, $appid)
-    {
-
-        try {
-            //使用BASE64对需要解密的字符串进行解码
-            $ciphertext_dec = base64_decode($encrypted);
-            $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
-            $iv = substr($this->key, 0, 16);
-            mcrypt_generic_init($module, $this->key, $iv);
-            //解密
-            $decrypted = mdecrypt_generic($module, $ciphertext_dec);
-            mcrypt_generic_deinit($module);
-            mcrypt_module_close($module);
-        } catch (Exception $e) {
-            return array(ErrorCode::$DecryptAESError, null);
-        }
-
-
-        try {
-            //去除补位字符
-            $pkc_encoder = new PKCS7Encoder;
-            $result = $pkc_encoder->decode($decrypted);
-            //去除16位随机字符串,网络字节序和AppId
-            if (strlen($result) < 16)
-                return "";
-            $content = substr($result, 16, strlen($result));
-            $len_list = unpack("N", substr($content, 0, 4));
-            $xml_len = $len_list[1];
-            $xml_content = substr($content, 4, $xml_len);
-            $from_appid = substr($content, $xml_len + 4);
-            if (!$appid)
-                $appid = $from_appid;
-            //如果传入的appid是空的，则认为是订阅号，使用数据中提取出来的appid
-        } catch (Exception $e) {
-            //print $e;
-            return array(ErrorCode::$IllegalBuffer, null);
-        }
-        if ($from_appid != $appid)
-            return array(ErrorCode::$ValidateAppidError, null);
-        //不注释上边两行，避免传入appid是错误的情况
-        return array(0, $xml_content, $from_appid); //增加appid，为了解决后面加密回复消息的时候没有appid的订阅号会无法回复
-
+  }
+  /**
+   * 对密文进行解密
+   * @param string $encrypted 需要解密的密文
+   * @return string 解密得到的明文
+   */
+  public function decrypt($encrypted, $appid){
+    try {
+      $iv = substr($this->key, 0, 16);
+      $decrypted = openssl_decrypt($encrypted,'AES-256-CBC',substr($this->key, 0, 32),OPENSSL_ZERO_PADDING,$iv);
+    } catch (Exception $e) {
+      return array(ErrorCode::$DecryptAESError, null);
     }
-
+    try {
+      //去除补位字符
+      $pkc_encoder = new PKCS7Encoder;
+      $result = $pkc_encoder->decode($decrypted);
+      //去除16位随机字符串,网络字节序和AppId
+      if (strlen($result) < 16)
+        return "";
+      $content = substr($result, 16, strlen($result));
+      $len_list = unpack("N", substr($content, 0, 4));
+      $xml_len = $len_list[1];
+      $xml_content = substr($content, 4, $xml_len);
+      $from_appid = substr($content, $xml_len + 4);
+      if (!$appid)
+        $appid = $from_appid;
+      //如果传入的appid是空的，则认为是订阅号，使用数据中提取出来的appid
+    } catch (Exception $e) {
+      //print $e;
+      return array(ErrorCode::$IllegalBuffer, null);
+    }
+    if ($from_appid != $appid)
+      return array(ErrorCode::$ValidateAppidError, null);
+    //不注释上边两行，避免传入appid是错误的情况
+    return array(0, $xml_content, $from_appid);
+    //增加appid，为了解决后面加密回复消息的时候没有appid的订阅号会无法回复
+  }
 
     /**
      * 随机生成16位字符串