微信公众平台消息体加解密实现

一、消息体加解密

微信公众平台在配置server时,提供了3种加解密的模式供开发人员选择,即明文模式、兼容模式、安全模式,选择兼容模式和安全模式前,需在开发人员中心填写消息加解密密钥EncodingAESKey。

  • 明文模式:维持现有模式。没有适配加解密新特性,消息体明文收发,默认设置为明文模式
  • 兼容模式:公众平台发送消息内容将同一时候包含明文和密文,消息包长度添加到原来的3倍左右。公众号回复明文或密文均可,不影响现有消息收发;开发人员可在此模式下进行调试
  • 安全模式(推荐):公众平台发送消息体的内容仅仅含有密文,公众账号回复的消息体也为密文,建议开发人员在调试成功后使用此模式收发消息

什么是EncodingAESKey?

  • 微信公众平台採用AES对称加密算法对推送给公众帐号的消息体对行加密。EncodingAESKey则是加密所用的秘钥。公众帐号用此秘钥对收到的密文消息体进行解密,回复消息体也用此秘钥加密。

  加解密的具体技术方案能够參考官方文档 http://mp.weixin.qq.com/wiki/index.php?

title=%E6%8A%80%E6%9C%AF%E6%96%B9%E6%A1%88

适用公众账号类型

  • 已认证订阅号
  • 服务号
  • 企业号

不能用于未认证订阅号。由于其没有appid參数


二、开发实现及数据分析

1. 配置

如果本次的开发配置中URL为

http://www.fangbei.org/index.php

接口程序中须要配置下面三项參数

/*
    方倍工作室 http://www.cnblogs.com/txw1958/
    CopyRight 2014 All Rights Reserved
*/
define("TOKEN", "weixin");
define("AppID", "wxbad0b45542aa0b5e");
define("EncodingAESKey", "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFG");
require_once(‘wxBizMsgCrypt.php‘);

 

2. 加解密实现

当用户向公众账号发送消息时,微信公众账号将会在URL中带上signature、timestamp、nonce、encrypt_type、msg_signature等參数,例如以下所看到的

http://www.fangbei.org/index.php?signature=35703636de2f9df2a77a662b68e521ce17c34db4&timestamp=1414243737&nonce=1792106704&encrypt_type=aes&msg_signature=6147984331daf7a1a9eed6e0ec3ba69055256154

同一时候向该接口推送例如以下XML消息 ,即一个已加密的消息

<xml>
    <ToUserName><![CDATA[gh_680bdefc8c5d]]></ToUserName>
    <Encrypt><![CDATA[MNn4+jJ/VsFh2gUyKAaOJArwEVYCvVmyN0iXzNarP3O6vXzK62ft1/KG2/XPZ4y5bPWU/jfIfQxODRQ7sLkUsrDRqsWimuhIT8Eq+w4E/28m+XDAQKEOjWTQIOp1p6kNsIV1DdC3B+AtcKcKSNAeJDr7x7GHLx5DZYK09qQsYDOjP6R5NqebFjKt/NpEl/GU3gWFwG8LCtRNuIYdK5axbFSfmXbh5CZ6Bk5wSwj5fu5aS90cMAgUhGsxrxZTY562QR6c+3ydXxb+GHI5w+qA+eqJjrQqR7u5hS+1x5sEsA7vS+bZ5LYAR3+PZ243avQkGllQ+rg7a6TeSGDxxhvLw+mxxinyk88BNHkJnyK//hM1k9PuvuLAASdaud4vzRQlAmnYOslZl8CN7gjCjV41skUTZv3wwGPxvEqtm/nf5fQ=]]></Encrypt>
</xml>

这时,程序须要从url中获得下面參数

$timestamp  = $_GET[‘timestamp‘];
$nonce = $_GET["nonce"];
$msg_signature  = $_GET[‘msg_signature‘];
$encrypt_type = $_GET[‘encrypt_type‘];

这些參数将用于加解密过程

收到消息后,先进行解密,解密部分代码例如以下

$postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
if ($encrypt_type == ‘aes‘){
    $pc = new WXBizMsgCrypt(TOKEN, EncodingAESKey, AppID);                
    $this->logger(" D \r\n".$postStr);
    $decryptMsg = "";  //解密后的明文
    $errCode = $pc->DecryptMsg($msg_signature, $timestamp, $nonce, $postStr, $decryptMsg);
    $postStr = $decryptMsg;
}

解密完毕后。把解密内容又返回给$postStr,这是为了保证将消息中解密后的内容和明文模式时的消息统一。方便兴许处理,解密后的XML例如以下

<xml>
    <ToUserName><![CDATA[gh_680bdefc8c5d]]></ToUserName>
    <FromUserName><![CDATA[oIDrpjpQ8j8mBuQ8nM26HWzNEZgg]]></FromUserName>
    <CreateTime>1414243737</CreateTime>
    <MsgType><![CDATA[text]]></MsgType>
    <Content><![CDATA[?

]]></Content> <MsgId>6074130599188426998</MsgId> </xml>

对消息在自己的原来代码中处理,完毕之后,要回复的消息例如以下

<xml>
    <ToUserName><![CDATA[oIDrpjpQ8j8mBuQ8nM26HWzNEZgg]]></ToUserName>
    <FromUserName><![CDATA[gh_680bdefc8c5d]]></FromUserName>
    <CreateTime>1414243733</CreateTime>
    <MsgType><![CDATA[text]]></MsgType>
    <Content><![CDATA[2014-10-25 21:28:53
技术支持 方倍工作室
http://www.fangbei.org/]]></Content>
</xml>

把上述消息进行加密,返回给微信公众账号

//加密
if ($encrypt_type == ‘aes‘){
    $encryptMsg = ‘‘; //加密后的密文
    $errCode = $pc->encryptMsg($result, $timeStamp, $nonce, $encryptMsg);
    $result = $encryptMsg;
    $this->logger(" E \r\n".$result);
}

加密后的内容例如以下

<xml>
    <Encrypt><![CDATA[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]]></Encrypt>
    <MsgSignature><![CDATA[6c46904dc1f58b2ddf2dd0399f1c6cf41f33ecb9]]></MsgSignature>
    <TimeStamp>1414243733</TimeStamp>
    <Nonce><![CDATA[1792106704]]></Nonce>
</xml>

这样,一个安全模式下的加解密消息就完毕了。

 

三、完整代码

  1 <?php
  2 /*
  3     方倍工作室 http://www.cnblogs.com/txw1958/
  4     CopyRight 2014 All Rights Reserved
  5 */
  6 define("TOKEN", "weixin");
  7 define("AppID", "wxbad0b45542aa0b5e");
  8 define("EncodingAESKey", "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFG");
  9 require_once(‘wxBizMsgCrypt.php‘);
 10 
 11 $wechatObj = new wechatCallbackapiTest();
 12 if (!isset($_GET[‘echostr‘])) {
 13     $wechatObj->responseMsg();
 14 }else{
 15     $wechatObj->valid();
 16 }
 17 
 18 class wechatCallbackapiTest
 19 {
 20     //验证签名
 21     public function valid()
 22     {
 23         $echoStr = $_GET["echostr"];
 24         $signature = $_GET["signature"];
 25         $timestamp = $_GET["timestamp"];
 26         $nonce = $_GET["nonce"];
 27         $tmpArr = array(TOKEN, $timestamp, $nonce);
 28         sort($tmpArr);
 29         $tmpStr = implode($tmpArr);
 30         $tmpStr = sha1($tmpStr);
 31         if($tmpStr == $signature){
 32             echo $echoStr;
 33             exit;
 34         }
 35     }
 36 
 37     //响应消息
 38     public function responseMsg()
 39     {
 40         $timestamp  = $_GET[‘timestamp‘];
 41         $nonce = $_GET["nonce"];
 42         $msg_signature  = $_GET[‘msg_signature‘];
 43         $encrypt_type = (isset($_GET[‘encrypt_type‘]) && ($_GET[‘encrypt_type‘] == ‘aes‘)) ? "aes" : "raw";
 44         
 45         $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
 46         if (!empty($postStr)){
 47             //解密
 48             if ($encrypt_type == ‘aes‘){
 49                 $pc = new WXBizMsgCrypt(TOKEN, EncodingAESKey, AppID);                
 50                 $this->logger(" D \r\n".$postStr);
 51                 $decryptMsg = "";  //解密后的明文
 52                 $errCode = $pc->DecryptMsg($msg_signature, $timestamp, $nonce, $postStr, $decryptMsg);
 53                 $postStr = $decryptMsg;
 54             }
 55             $this->logger(" R \r\n".$postStr);
 56             $postObj = simplexml_load_string($postStr, ‘SimpleXMLElement‘, LIBXML_NOCDATA);
 57             $RX_TYPE = trim($postObj->MsgType);
 58 
 59             //消息类型分离
 60             switch ($RX_TYPE)
 61             {
 62                 case "event":
 63                     $result = $this->receiveEvent($postObj);
 64                     break;
 65                 case "text":
 66                     $result = $this->receiveText($postObj);
 67                     break;
 68             }
 69             $this->logger(" R \r\n".$result);
 70             //加密
 71             if ($encrypt_type == ‘aes‘){
 72                 $encryptMsg = ‘‘; //加密后的密文
 73                 $errCode = $pc->encryptMsg($result, $timeStamp, $nonce, $encryptMsg);
 74                 $result = $encryptMsg;
 75                 $this->logger(" E \r\n".$result);
 76             }
 77             echo $result;
 78         }else {
 79             echo "";
 80             exit;
 81         }
 82     }
 83 
 84     //接收事件消息
 85     private function receiveEvent($object)
 86     {
 87         $content = "";
 88         switch ($object->Event)
 89         {
 90             case "subscribe":
 91                 $content = "欢迎关注方倍工作室 ";
 92                 break;
 93         }
 94 
 95         $result = $this->transmitText($object, $content);
 96         return $result;
 97     }
 98 
 99     //接收文本消息
100     private function receiveText($object)
101     {
102         $keyword = trim($object->Content);
103         if (strstr($keyword, "文本")){
104             $content = "这是个文本消息";
105         }else if (strstr($keyword, "单图文")){
106             $content = array();
107             $content[] = array("Title"=>"单图文标题",  "Description"=>"单图文内容", "PicUrl"=>"http://discuz.comli.com/weixin/weather/icon/cartoon.jpg", "Url" =>"http://m.cnblogs.com/?u=txw1958");
108         }else if (strstr($keyword, "图文") || strstr($keyword, "多图文")){
109             $content = array();
110             $content[] = array("Title"=>"多图文1标题", "Description"=>"", "PicUrl"=>"http://discuz.comli.com/weixin/weather/icon/cartoon.jpg", "Url" =>"http://m.cnblogs.com/?u=txw1958");
111             $content[] = array("Title"=>"多图文2标题", "Description"=>"", "PicUrl"=>"http://d.hiphotos.bdimg.com/wisegame/pic/item/f3529822720e0cf3ac9f1ada0846f21fbe09aaa3.jpg", "Url" =>"http://m.cnblogs.com/?

u=txw1958"); 112 $content[] = array("Title"=>"多图文3标题", "Description"=>"", "PicUrl"=>"http://g.hiphotos.bdimg.com/wisegame/pic/item/18cb0a46f21fbe090d338acc6a600c338644adfd.jpg", "Url" =>"http://m.cnblogs.com/?u=txw1958"); 113 }else if (strstr($keyword, "音乐")){ 114 $content = array(); 115 $content = array("Title"=>"最炫民族风", "Description"=>"歌手:凤凰传奇", "MusicUrl"=>"http://121.199.4.61/music/zxmzf.mp3", "HQMusicUrl"=>"http://121.199.4.61/music/zxmzf.mp3"); 116 }else{ 117 $content = date("Y-m-d H:i:s",time())."\n".$object->FromUserName."\n技术支持 方倍工作室"; 118 } 119 120 if(is_array($content)){ 121 if (isset($content[0])){ 122 $result = $this->transmitNews($object, $content); 123 }else if (isset($content[‘MusicUrl‘])){ 124 $result = $this->transmitMusic($object, $content); 125 } 126 }else{ 127 $result = $this->transmitText($object, $content); 128 } 129 return $result; 130 } 131 132 //回复文本消息 133 private function transmitText($object, $content) 134 { 135 $xmlTpl = "<xml> 136 <ToUserName><![CDATA[%s]]></ToUserName> 137 <FromUserName><![CDATA[%s]]></FromUserName> 138 <CreateTime>%s</CreateTime> 139 <MsgType><![CDATA[text]]></MsgType> 140 <Content><![CDATA[%s]]></Content> 141 </xml>"; 142 $result = sprintf($xmlTpl, $object->FromUserName, $object->ToUserName, time(), $content); 143 return $result; 144 } 145 146 //回复图文消息 147 private function transmitNews($object, $newsArray) 148 { 149 if(!is_array($newsArray)){ 150 return; 151 } 152 $itemTpl = " <item> 153 <Title><![CDATA[%s]]></Title> 154 <Description><![CDATA[%s]]></Description> 155 <PicUrl><![CDATA[%s]]></PicUrl> 156 <Url><![CDATA[%s]]></Url> 157 </item> 158 "; 159 $item_str = ""; 160 foreach ($newsArray as $item){ 161 $item_str .= sprintf($itemTpl, $item[‘Title‘], $item[‘Description‘], $item[‘PicUrl‘], $item[‘Url‘]); 162 } 163 $xmlTpl = "<xml> 164 <ToUserName><![CDATA[%s]]></ToUserName> 165 <FromUserName><![CDATA[%s]]></FromUserName> 166 <CreateTime>%s</CreateTime> 167 <MsgType><![CDATA[news]]></MsgType> 168 <ArticleCount>%s</ArticleCount> 169 <Articles> 170 $item_str </Articles> 171 </xml>"; 172 173 $result = sprintf($xmlTpl, $object->FromUserName, $object->ToUserName, time(), count($newsArray)); 174 return $result; 175 } 176 177 //回复音乐消息 178 private function transmitMusic($object, $musicArray) 179 { 180 $itemTpl = "<Music> 181 <Title><![CDATA[%s]]></Title> 182 <Description><![CDATA[%s]]></Description> 183 <MusicUrl><![CDATA[%s]]></MusicUrl> 184 <HQMusicUrl><![CDATA[%s]]></HQMusicUrl> 185 </Music>"; 186 187 $item_str = sprintf($itemTpl, $musicArray[‘Title‘], $musicArray[‘Description‘], $musicArray[‘MusicUrl‘], $musicArray[‘HQMusicUrl‘]); 188 189 $xmlTpl = "<xml> 190 <ToUserName><![CDATA[%s]]></ToUserName> 191 <FromUserName><![CDATA[%s]]></FromUserName> 192 <CreateTime>%s</CreateTime> 193 <MsgType><![CDATA[music]]></MsgType> 194 $item_str 195 </xml>"; 196 197 $result = sprintf($xmlTpl, $object->FromUserName, $object->ToUserName, time()); 198 return $result; 199 } 200 201 //日志记录 202 public function logger($log_content) 203 { 204 if(isset($_SERVER[‘HTTP_APPNAME‘])){ //SAE 205 sae_set_display_errors(false); 206 sae_debug($log_content); 207 sae_set_display_errors(true); 208 }else if($_SERVER[‘REMOTE_ADDR‘] != "127.0.0.1"){ //LOCAL 209 $max_size = 500000; 210 $log_filename = "log.xml"; 211 if(file_exists($log_filename) and (abs(filesize($log_filename)) > $max_size)){unlink($log_filename);} 212 file_put_contents($log_filename, date(‘Y-m-d H:i:s‘).$log_content."\r\n", FILE_APPEND); 213 } 214 } 215 } 216 ?>

 

微信公众平台消息体加解密实现

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