企业微信加密消息体_微信公众平台开发者中心安全模式消息体加解密实现

关键字：微信公众平台消息体签名消息体加解密 EncodingAESKey 安全模式

一、消息体加解密

微信公众平台在配置服务器时，提供了3种加解密的模式供开发者选择，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，需在开发者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时包括明文和密文，消息包长度增加到原来的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；开发者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只含有密文，公众账号回复的消息体也为密文，建议开发者在调试成功后使用此模式收发消息

什么是EncodingAESKey？

微信公众平台采用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。AES对称加密算法的原理可以参考 http://www.cnblogs.com/txw1958/p/aes.html

加解密的详细技术方案可以参考官方文档 http://mp.weixin.qq.com/wiki/index.php?title=%E6%8A%80%E6%9C%AF%E6%96%B9%E6%A1%88

二、开发实现及数据分析

1. 配置

假设本次的开发配置中URL为

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

接口程序中需要配置以下三项参数

/*方倍工作室 http://www.cnblogs.com/txw1958/

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等参数，如下所示

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

同时向该接口推送如下XML消息，即一个已加密的消息

这时，程序需要从url中获得以下参数

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

这些参数将用于加解密过程

收到消息后，先进行解密，解密部分代码如下

$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;

}

解密完成后，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，方便后续处理，解密后的XML如下

1414243737

6074130599188426998

对消息在自己的原来代码中处理，完成之后，要回复的消息如下

1414243733

技术支持方倍工作室

http://www.fangbei.org/]]>

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);

}

加密后的内容如下

1414243733

这样，一个安全模式下的加解密消息就完成了。

三、完整代码

1 <?php2 /*

6 define("TOKEN", "weixin");7 define("AppID", "wxbad0b45542aa0b5e");8 define("EncodingAESKey", "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFG");9 require_once('wxBizMsgCrypt.php');10

11 $wechatObj = newwechatCallbackapiTest();12 if (!isset($_GET['echostr'])) {13 $wechatObj->responseMsg();14 }else{15 $wechatObj->valid();16 }17

18 classwechatCallbackapiTest19 {20 //验证签名

21 public functionvalid()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 functionresponseMsg()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 = "136 137 138 %s139 140 141 ";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 = "153 154 155 156 157 158 ";159 $item_str = "";160 foreach ($newsArray as $item){161 $item_str .= sprintf($itemTpl, $item['Title'], $item['Description'], $item['PicUrl'], $item['Url']);162 }163 $xmlTpl = "164 165 166 %s167 168 %s169 170 $item_str171 ";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 = "181 182 183 184 185 ";186

187 $item_str = sprintf($itemTpl, $musicArray['Title'], $musicArray['Description'], $musicArray['MusicUrl'], $musicArray['HQMusicUrl']);188

189 $xmlTpl = "190 191 192 %s193 194 $item_str

195 ";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 ?>