WXBizDataCrypt.class.php
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<?php
namespace lib;
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);
$result=openssl_decrypt($aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);
$dataObj=json_decode($result);
print_r($aesCipher);
print_r("=======");
print_r($this->appid);
return;
if( $dataObj == NULL )
{
return ErrorCode::$IllegalBuffer;
}
if( $dataObj->watermark->appid != $this->appid )
{
return ErrorCode::$IllegalBuffer;
}
$data = $result;
return ErrorCode::$OK;
}
}
class ErrorCode
{
public static $OK = 0;
public static $IllegalAesKey = -41001;
public static $IllegalIv = -41002;
public static $IllegalBuffer = -41003;
public static $DecodeBase64Error = -41004;
}