/**
* 价格上报加密：
* @author Vincenzo_Jiang
* @param string $requestId 请求Id
* @param int $price 加密价格
* @param string $iKey
* @param string $eKey
* @return string
*/
 
function priceSecret(string $requestId ,int $price, string $iKey, string $eKey): string
 
{
 
 
 
$requestId = strlen($requestId) < 16 ? md5($requestId) : $requestId;
 
$iv = substr($requestId, 0, 16);
 
 
 
$pad = substr(hash_hmac("sha1", $iv, $eKey, true),0, 8);
 
$price = pack("J", str_pad($price, 8, 0, STR_PAD_LEFT));
 
$encPrice = $pad ^ $price;
 
 
 
$signature = substr(hash_hmac("sha1", $price.$iv, $iKey, true), 0, 4);
 
return str_replace(["/", "+"], ["_", "-"], base64_encode($iv . $encPrice . $signature));
 
}