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- <?php
- /**
- * 对微信小程序用户加密数据的解密示例代码.
- *
- * @copyright Copyright (c) 1998-2014 Tencent Inc.
- */
- include_once "pkcs7Encoder.php";
- include_once "errorCode.php";
- class WXBizDataCrypt
- {
- private $appid;
- private $sessionKey;
- /**
- * 构造函数
- * @param $sessionKey string 用户在小程序登录后获取的会话密钥
- * @param $appid string 小程序的appid
- */
- public function __construct( $appid, $sessionKey)
- {
- $this->sessionKey = $sessionKey;
- $this->appid = $appid;
- }
- /**
- * 检验数据的真实性,并且获取解密后的明文.
- * @param $encryptedData string 加密的用户数据
- * @param $iv string 与用户数据一同返回的初始向量
- * @param $data string 解密后的原文
- *
- * @return int 成功0,失败返回对应的错误码
- */
- public function decryptData( $encryptedData, $iv, &$data )
- {
- if (strlen($this->sessionKey) != 24) {
- return ErrorCode::$IllegalAesKey;
- }
- $aesKey=base64_decode($this->sessionKey);
-
- if (strlen($iv) != 24) {
- return ErrorCode::$IllegalIv;
- }
- $aesIV=base64_decode($iv);
- $aesCipher=base64_decode($encryptedData);
- $pc = new Prpcrypt($aesKey);
- $result = $pc->decrypt($aesCipher,$aesIV);
-
- if ($result[0] != 0) {
- return $result[0];
- }
-
- $dataObj=json_decode( $result[1] );
- if( $dataObj == NULL )
- {
- return ErrorCode::$IllegalBuffer;
- }
- if( $dataObj->watermark->appid != $this->appid )
- {
- return ErrorCode::$IllegalBuffer;
- }
- $data = $result[1];
- return ErrorCode::$OK;
- }
- }
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