59 lines
1.7 KiB
PHP
59 lines
1.7 KiB
PHP
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<?php
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/**
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* 对微信小程序用户加密数据的解密示例代码
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* Class WXBizDataCrypt
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* @copyright Copyright (c) 1998-2014 Tencent Inc.
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*/
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class WXBizDataCrypt
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{
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private $appid;
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private $sessionKey;
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/**
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* 构造函数
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* @param $sessionKey string 用户在小程序登录后获取的会话密钥
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* @param $appid string 小程序的appid
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*/
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public function __construct($appid, $sessionKey)
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{
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$this->appid = $appid;
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$this->sessionKey = $sessionKey;
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include_once __DIR__ . DIRECTORY_SEPARATOR . "errorCode.php";
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}
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/**
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* 检验数据的真实性，并且获取解密后的明文.
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* @param $encryptedData string 加密的用户数据
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* @param $iv string 与用户数据一同返回的初始向量
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* @param $data string 解密后的原文
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*
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* @return int 成功0，失败返回对应的错误码
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*/
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public function decryptData($encryptedData, $iv, &$data)
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{
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if (strlen($this->sessionKey) != 24) {
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return ErrorCode::$IllegalAesKey;
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}
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$aesKey = base64_decode($this->sessionKey);
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if (strlen($iv) != 24) {
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return ErrorCode::$IllegalIv;
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}
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$aesIV = base64_decode($iv);
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$aesCipher = base64_decode($encryptedData);
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$result = openssl_decrypt($aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);
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$dataObj = json_decode($result);
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if ($dataObj == null) {
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return ErrorCode::$IllegalBuffer;
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}
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// 兼容新版本无 watermark 的情况
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if (isset($dataObj->watermark) && $dataObj->watermark->appid != $this->appid) {
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return ErrorCode::$IllegalBuffer;
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}
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$data = $result;
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return ErrorCode::$OK;
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}
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}
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