www.gusucode.com > wxApp PHP版微信小程序CMS系统 v1.0PHP源码程序 > wxApp PHP版微信小程序CMS系统 v1.0/wxAppCMS_v1.0.0/wxAppCMS_v1.0.0/app/weixin/weixin_crypt.class.php
<?php
/**
* 1.第三方回复加密消息给公众平台；
* 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。
*/
class weixin_crypt{
/**
* @param $token string 公众平台上，开发者设置的token
* @param $aeskey string 公众平台上，开发者设置的EncodingAESKey
* @param $appId string 公众平台的appId
*/
public static $token;
public static $aeskey;
public static $appId;
public static $timeStamp;
public static $nonce;
/**
* 将公众平台回复用户的消息加密打包.
* <ol>
* <li>对要发送的消息进行AES-CBC加密</li>
* <li>生成安全签名</li>
* <li>将消息密文和安全签名打包成xml格式</li>
* </ol>
*
* @param $replyMsg string 公众平台待回复用户的消息，xml格式的字符串
* @param &$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,
* 当return返回0时有效
*
* @return int 成功0，失败返回对应的错误码
*/
public static function encrypt($replyMsg, &$encryptMsg){
Prpcrypt::aeskey(self::$aeskey);
//加密
$array = Prpcrypt::encrypt($replyMsg, self::$appId);
$ret = $array[0];
if ($ret != 0) {
return $ret;
}
if (self::$timeStamp == null) {
self::$timeStamp = time();
}
$encrypt = $array[1];
//生成安全签名
$array = self::getSHA1(self::$token, self::$timeStamp, self::$nonce, $encrypt);
$ret = $array[0];
if ($ret != 0) {
return $ret;
}
$signature = $array[1];
//生成发送的xml
$encryptMsg = self::generate($encrypt, $signature, self::$timeStamp, self::$nonce);
return ErrorCode::$OK;
}
/**
* 检验消息的真实性，并且获取解密后的明文.
* <ol>
* <li>利用收到的密文生成安全签名，进行签名验证</li>
* <li>若验证通过，则提取xml中的加密消息</li>
* <li>对消息进行解密</li>
* </ol>
*
* @param $msgSignature string 签名串，对应URL参数的msg_signature
* @param $input string 密文，对应POST请求的数据
* @param &$msg string 解密后的原文，当return返回0时有效
*
* @return int 成功0，失败返回对应的错误码
*/
public static function decrypt($msgSignature, &$msg, $input=null){
if (strlen(self::$aeskey) != 43) {
return ErrorCode::$IllegalAesKey;
}
$input===null && $input = file_get_contents("php://input");
//提取密文
$array = self::extract($input);
$ret = $array[0];
if ($ret != 0) {
return $ret;
}
if (self::$timeStamp == null) {
self::$timeStamp = time();
}
$encrypt = $array[1];
$touser_name = $array[2];
//验证安全签名
$array = self::getSHA1(self::$token, self::$timeStamp, self::$nonce, $encrypt);
$ret = $array[0];
if ($ret != 0) {
return $ret;
}
$signature = $array[1];
if ($signature != $msgSignature) {
return ErrorCode::$ValidateSignatureError;
}
Prpcrypt::aeskey(self::$aeskey);
$result = Prpcrypt::decrypt($encrypt, self::$appId);
if ($result[0] != 0) {
return $result[0];
}
$msg = $result[1];
return ErrorCode::$OK;
}
/**
* 用SHA1算法生成安全签名
* @param string $token 票据
* @param string $timestamp 时间戳
* @param string $nonce 随机字符串
* @param string $encrypt 密文消息
*/
public static function getSHA1($token, $timestamp, $nonce, $encrypt_msg){
//排序
try {
$array = array($encrypt_msg, $token, $timestamp, $nonce);
sort($array, SORT_STRING);
$str = implode($array);
return array(ErrorCode::$OK, sha1($str));
} catch (Exception $e) {
//print $e . "\n";
return array(ErrorCode::$ComputeSignatureError, null);
}
}
/**
* 提取出xml数据包中的加密消息
* @param string $xmltext 待提取的xml字符串
* @return string 提取出的加密消息字符串
*/
public static function extract($input){
try {
$array = iUtils::INPUT($input);
$encrypt = $array['Encrypt'];
$tousername = $array['ToUserName'];
return array(0, $encrypt, $tousername);
} catch (Exception $e) {
//print $e . "\n";
return array(ErrorCode::$ParseXmlError, null, null);
}
}
/**
* 生成xml消息
* @param string $encrypt 加密后的消息密文
* @param string $signature 安全签名
* @param string $timestamp 时间戳
* @param string $nonce 随机字符串
*/
public static function generate($encrypt, $signature, $timestamp, $nonce){
$format = "<xml>
<Encrypt><![CDATA[%s]]></Encrypt>
<MsgSignature><![CDATA[%s]]></MsgSignature>
<TimeStamp>%s</TimeStamp>
<Nonce><![CDATA[%s]]></Nonce>
</xml>";
return sprintf($format, $encrypt, $signature, $timestamp, $nonce);
}
}
/**
* error code 说明.
* <ul>
* <li>-40001: 签名验证错误</li>
* <li>-40002: xml解析失败</li>
* <li>-40003: sha加密生成签名失败</li>
* <li>-40004: encodingAesKey 非法</li>
* <li>-40005: appid 校验错误</li>
* <li>-40006: aes 加密失败</li>
* <li>-40007: aes 解密失败</li>
* <li>-40008: 解密后得到的buffer非法</li>
* <li>-40009: base64加密失败</li>
* <li>-40010: base64解密失败</li>
* <li>-40011: 生成xml失败</li>
* </ul>
*/
class ErrorCode{
public static $OK = 0;
public static $ValidateSignatureError = -40001;
public static $ParseXmlError = -40002;
public static $ComputeSignatureError = -40003;
public static $IllegalAesKey = -40004;
public static $ValidateAppidError = -40005;
public static $EncryptAESError = -40006;
public static $DecryptAESError = -40007;
public static $IllegalBuffer = -40008;
public static $EncodeBase64Error = -40009;
public static $DecodeBase64Error = -40010;
public static $GenReturnXmlError = -40011;
}
/**
* PKCS7Encoder class
*
* 提供基于PKCS7算法的加解密接口.
*/
class PKCS7Encoder{
public static $block_size = 32;
/**
* 对需要加密的明文进行填充补位
* @param $text 需要进行填充补位操作的明文
* @return 补齐明文字符串
*/
public static function encode($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 . $tmp;
}
/**
* 对解密后的明文进行补位删除
* @param decrypted 解密后的明文
* @return 删除填充补位后的明文
*/
public static function decode($text){
$pad = ord(substr($text, -1));
if ($pad < 1 || $pad > 32) {
$pad = 0;
}
return substr($text, 0, (strlen($text) - $pad));
}
}
/**
* Prpcrypt class
*
* 提供接收和推送给公众平台消息的加解密接口.
*/
class Prpcrypt{
public static $key;
public static function aeskey($k){
self::$key = base64_decode($k . "=");
}
/**
* 对明文进行加密
* @param string $text 需要加密的明文
* @return string 加密后的密文
*/
public static function encrypt($text, $appid){
try {
//获得16位随机字符串，填充到明文之前
$random = self::getRandomStr();
$text = $random . pack("N", strlen($text)) . $text . $appid;
//使用自定义的填充方式对明文进行补位填充
$text = PKCS7Encoder::encode($text);
$iv = substr(self::$key, 0, 16);
if(function_exists('openssl_encrypt')){
$encrypted = openssl_encrypt($text, 'AES-256-CBC', substr(self::$key, 0, 32), OPENSSL_ZERO_PADDING, $iv);
}else{
// 网络字节序
// $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
mcrypt_generic_init($module, self::$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 $encrypted 需要解密的密文
* @return string 解密得到的明文
*/
public static function decrypt($encrypted, $appid) {
try {
//使用BASE64对需要解密的字符串进行解码
$iv = substr(self::$key, 0, 16);
if(function_exists('openssl_decrypt')){
$decrypted = openssl_decrypt($encrypted, 'AES-256-CBC', substr(self::$key, 0, 32), OPENSSL_ZERO_PADDING, $iv);
}else{
$ciphertext_dec = base64_decode($encrypted);
$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
mcrypt_generic_init($module, self::$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
$result = PKCS7Encoder::decode($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);
} catch (Exception $e) {
//print $e;
return array(ErrorCode::$IllegalBuffer, null);
}
if ($from_appid != $appid)
return array(ErrorCode::$ValidateAppidError, null);
return array(0, $xml_content);
}
/**
* 随机生成16位字符串
* @return string 生成的字符串
*/
public static function getRandomStr(){
$str = "";
$str_pol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
$max = strlen($str_pol) - 1;
for ($i = 0; $i < 16; $i++) {
$str .= $str_pol[mt_rand(0, $max)];
}
return $str;
}
}
// // 第三方发送消息给公众平台
// $encodingAesKey = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFG";
// $token = "pamtest";
// $timeStamp = "1409304348";
// $nonce = "xxxxxx";
// $appId = "wxb11529c136998cb6";
// $text = "<xml><ToUserName><![CDATA[oia2Tj我是中文jewbmiOUlr6X-1crbLOvLw]]></ToUserName><FromUserName><![CDATA[gh_7f083739789a]]></FromUserName><CreateTime>1407743423</CreateTime><MsgType><![CDATA[video]]></MsgType><Video><MediaId><![CDATA[eYJ1MbwPRJtOvIEabaxHs7TX2D-HV71s79GUxqdUkjm6Gs2Ed1KF3ulAOA9H1xG0]]></MediaId><Title><![CDATA[testCallBackReplyVideo]]></Title><Description><![CDATA[testCallBackReplyVideo]]></Description></Video></xml>";
// weixin_crypt::$token = $token;
// weixin_crypt::$aeskey = $encodingAesKey;
// weixin_crypt::$appId = $appId;
// weixin_crypt::$timeStamp = $timeStamp;
// weixin_crypt::$nonce = $nonce;
// // $pc = new weixin_crypt($token, $encodingAesKey, $appId);
// $encryptMsg = '';
// $errCode = weixin_crypt::encrypt($text, $encryptMsg);
// if ($errCode == 0) {
// print("加密后: " . $encryptMsg . "\n");
// } else {
// print($errCode . "\n");
// }
// $xml_tree = new DOMDocument();
// $xml_tree->loadXML($encryptMsg);
// $array_e = $xml_tree->getElementsByTagName('Encrypt');
// $array_s = $xml_tree->getElementsByTagName('MsgSignature');
// $encrypt = $array_e->item(0)->nodeValue;
// $msg_sign = $array_s->item(0)->nodeValue;
// $format = "<xml><ToUserName><![CDATA[toUser]]></ToUserName><Encrypt><![CDATA[%s]]></Encrypt></xml>";
// $from_xml = sprintf($format, $encrypt);
// // 第三方收到公众号平台发送的消息
// $msg = '';
// $errCode = weixin_crypt::decrypt($msg_sign, $from_xml, $msg);
// if ($errCode == 0) {
// print("解密后: " . $msg . "\n");
// } else {
// print($errCode . "\n");
// }