333 lines
9.6 KiB
PHP
Executable File
333 lines
9.6 KiB
PHP
Executable File
<?php
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namespace hema\wechat;
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use app\common\model\Setting;
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/**
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* 对公众平台发送给公众账号的消息加解密示例代码.
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*
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* @copyright Copyright (c) 1998-2014 Tencent Inc.
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*
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* 1.第三方回复加密消息给公众平台；
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* 2.第三方收到公众平台发送的消息，验证消息的安全性，并对消息进行解密。
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*/
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class WxBizMsgCrypt
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{
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private $token;
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private $encodingAesKey;
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private $appId;
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private $block_size = 32;
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private $keys;
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private $OK = 0;
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private $ValidateSignatureError = -40001; //签名验证错误
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private $ParseXmlError = -40002; //xml解析失败
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private $ComputeSignatureError = -40003; //sha加密生成签名失败
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private $IllegalAesKey = -40004; //encodingAesKey 非法
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private $ValidateAppidError = -40005; //appid 校验错误
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private $EncryptAESError = -40006; //aes 加密失败
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private $DecryptAESError = -40007; //aes 解密失败
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private $IllegalBuffer = -40008; //解密后得到的buffer非法
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private $EncodeBase64Error = -40009; //base64加密失败
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private $DecodeBase64Error = -40010; //base64解密失败
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private $GenReturnXmlError = -40011; //生成xml失败
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/**
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* 构造函数
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* @param $token string 公众平台上，开发者设置的token
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* @param $encodingAesKey string 公众平台上，开发者设置的EncodingAESKey
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* @param $appId string 公众平台的appId
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*/
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public function __construct()
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{
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$values = Setting::getItem('wxopen');
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$this->token = $values['token'];
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$this->encodingAesKey = $values['encoding_aes_key'];
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$this->appId = $values['app_id'];
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$this->keys = base64_decode($values['encoding_aes_key'] . "=");
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}
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/**
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* 将公众平台回复用户的消息加密打包.
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* <ol>
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* <li>对要发送的消息进行AES-CBC加密</li>
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* <li>生成安全签名</li>
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* <li>将消息密文和安全签名打包成xml格式</li>
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* </ol>
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*
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* @param $replyMsg string 公众平台待回复用户的消息，xml格式的字符串
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* @param $timeStamp string 时间戳，可以自己生成，也可以用URL参数的timestamp
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* @param $nonce string 随机串，可以自己生成，也可以用URL参数的nonce
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* @param &$encryptMsg string 加密后的可以直接回复用户的密文，包括msg_signature, timestamp, nonce, encrypt的xml格式的字符串,
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* 当return返回0时有效
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*
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* @return int 成功0，失败返回对应的错误码
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*/
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public function encryptMsg($replyMsg, $timeStamp, $nonce, &$encryptMsg)
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{
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//加密
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$array = $this->encrypt($replyMsg, $this->appId);
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$ret = $array[0];
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if ($ret != 0) {
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return $ret;
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}
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if ($timeStamp == null) {
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$timeStamp = time();
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}
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$encrypt = $array[1];
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//生成安全签名
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$array = $this->getSHA1($this->token, $timeStamp, $nonce, $encrypt);
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$ret = $array[0];
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if ($ret != 0) {
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return $ret;
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}
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$signature = $array[1];
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//生成发送的xml
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$encryptMsg = $this->generate($encrypt, $signature, $timeStamp, $nonce);
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return $this->OK;
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}
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/**
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* 检验消息的真实性，并且获取解密后的明文.
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* <ol>
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* <li>利用收到的密文生成安全签名，进行签名验证</li>
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* <li>若验证通过，则提取xml中的加密消息</li>
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* <li>对消息进行解密</li>
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* </ol>
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*
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* @param $msgSignature string 签名串，对应URL参数的msg_signature
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* @param $timestamp string 时间戳 对应URL参数的timestamp
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* @param $nonce string 随机串，对应URL参数的nonce
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* @param $postData string 密文，对应POST请求的数据
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* @param &$msg string 解密后的原文，当return返回0时有效
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*
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* @return int 成功0，失败返回对应的错误码
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*/
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public function decryptMsg($msgSignature='', $timestamp = null, $nonce='', $postData='', &$msg='')
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{
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if (strlen($this->encodingAesKey) != 43) {
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return $this->IllegalAesKey;
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}
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//提取密文
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$array = $this->extracts($postData);
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$ret = $array[0];
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if ($ret != 0) {
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return $ret;
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}
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if ($timestamp == null) {
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$timestamp = time();
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}
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$encrypt = $array[1];
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//验证安全签名
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$array = $this->getSHA1($this->token, $timestamp, $nonce, $encrypt);
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$ret = $array[0];
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if ($ret != 0) {
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return $ret;
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}
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$signature = $array[1];
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if ($signature != $msgSignature) {
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return $this->ValidateSignatureError;
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}
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$result = $this->decrypt($encrypt,$this->appId);
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if ($result[0] != 0) {
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return $result[0];
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}
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$msg = $result[1];
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return $this->OK;
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}
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/**
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* 用SHA1算法生成安全签名
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* @param string $token 票据
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* @param string $timestamp 时间戳
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* @param string $nonce 随机字符串
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* @param string $encrypt 密文消息
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*/
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private function getSHA1($token, $timestamp, $nonce, $encrypt_msg)
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{
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//排序
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try {
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$array = array($token, $timestamp, $nonce, $encrypt_msg);
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sort($array, SORT_STRING);
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$str = sha1(implode($array));
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return array($this->OK, $str);
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} catch (Exception $e) {
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//print $e . "\n";
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return array($this->ComputeSignatureError, null);
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}
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}
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/**
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* 提取出xml数据包中的加密消息
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* @param string $xmltext 待提取的xml字符串
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* @return string 提取出的加密消息字符串
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*/
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private function extracts($xmltext)
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{
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try {
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$xml = new \DOMDocument();
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$xml->loadXML($xmltext);
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$array_a = $xml->getElementsByTagName('Encrypt');
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$Encrypt = $array_a->item(0)->nodeValue;
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return array(0,$Encrypt);
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} catch (Exception $e) {
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//print $e . "\n";
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return array($this->ParseXmlError, null, null);
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}
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}
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/**
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* 生成xml消息
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* @param string $encrypt 加密后的消息密文
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* @param string $signature 安全签名
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* @param string $timestamp 时间戳
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* @param string $nonce 随机字符串
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*/
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private function generate($encrypt, $signature, $timestamp, $nonce)
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{
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$format = "<xml>
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<Encrypt><![CDATA[%s]]></Encrypt>
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<MsgSignature><![CDATA[%s]]></MsgSignature>
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<TimeStamp>%s</TimeStamp>
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<Nonce><![CDATA[%s]]></Nonce>
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</xml>";
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return sprintf($format, $encrypt, $signature, $timestamp, $nonce);
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}
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/**
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* 对需要加密的明文进行填充补位
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* @param $text 需要进行填充补位操作的明文
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* @return 补齐明文字符串
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*/
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private function encode($text)
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{
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$block_size = $this->block_size;
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$text_length = strlen($text);
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//计算需要填充的位数
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$amount_to_pad = $this->block_size - ($text_length % $this->block_size);
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if ($amount_to_pad == 0) {
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$amount_to_pad = $this->block_size;
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}
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//获得补位所用的字符
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$pad_chr = chr($amount_to_pad);
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$tmp = "";
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for ($index = 0; $index < $amount_to_pad; $index++) {
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$tmp .= $pad_chr;
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}
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return $text . $tmp;
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}
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/**
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* 对解密后的明文进行补位删除
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* @param decrypted 解密后的明文
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* @return 删除填充补位后的明文
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*/
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private function decode($text)
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{
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$pad = ord(substr($text, -1));
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if ($pad < 1 || $pad > 32) {
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$pad = 0;
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}
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return substr($text, 0, (strlen($text) - $pad));
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}
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/**
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* 对明文进行加密
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* @param string $text 需要加密的明文
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* @return string 加密后的密文
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*/
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private function encrypt($text, $appid)
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{
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try {
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//获得16位随机字符串，填充到明文之前
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$random = $this->getRandomStr();
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$text = $random . pack("N", strlen($text)) . $text . $appid;
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// 网络字节序
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$size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
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$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
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$iv = substr($this->keys, 0, 16);
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//使用自定义的填充方式对明文进行补位填充
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$text = $this->encode($text);
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mcrypt_generic_init($module, $this->keys, $iv);
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//加密
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$encrypted = mcrypt_generic($module, $text);
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mcrypt_generic_deinit($module);
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mcrypt_module_close($module);
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//print(base64_encode($encrypted));
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//使用BASE64对加密后的字符串进行编码
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return array($this->OK, base64_encode($encrypted));
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} catch (Exception $e) {
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//print $e;
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return array($this->EncryptAESError, null);
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}
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}
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/**
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* 对密文进行解密
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* @param string $encrypted 需要解密的密文
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* @return string 解密得到的明文
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*/
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private function decrypt($encrypted, $appid)
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{
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try {
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//使用BASE64对需要解密的字符串进行解码
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$ciphertext_dec = base64_decode($encrypted);
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$iv = substr($this->keys, 0, 16);
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//解密
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$decrypted = openssl_decrypt($ciphertext_dec, "aes-256-cbc", $this->keys, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING, $iv);
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} catch (Exception $e) {
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return array($this->DecryptAESError, null);
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}
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try {
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//去除补位字符
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$result = $this->decode($decrypted);
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//去除16位随机字符串,网络字节序和AppId
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if (strlen($result) < 16)
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return "";
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$content = substr($result, 16, strlen($result));
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$len_list = unpack("N", substr($content, 0, 4));
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$xml_len = $len_list[1];
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$xml_content = substr($content, 4, $xml_len);
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$from_appid = substr($content, $xml_len + 4);
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} catch (Exception $e) {
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//print $e;
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return array($this->IllegalBuffer, null);
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}
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if ($from_appid != $appid)
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return array($this->ValidateAppidError, null);
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return array(0, $xml_content);
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}
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/**
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* 随机生成16位字符串
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* @return string 生成的字符串
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*/
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private function getRandomStr()
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{
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$str = "";
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$str_pol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
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$max = strlen($str_pol) - 1;
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for ($i = 0; $i < 16; $i++) {
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$str .= $str_pol[mt_rand(0, $max)];
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}
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return $str;
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}
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} |