public static function updateMultipartUploadContext($UploadId, $iv, $lastPart = FALSE)
{
$encryptionDir = KS3_API_PATH . DIRECTORY_SEPARATOR . "cache" . DIRECTORY_SEPARATOR . "encryption" . DIRECTORY_SEPARATOR;
$content = EncryptionUtil::getMultipartUploadContext($UploadId);
$content["nextIv"] = base64_encode($iv);
$content["lastPart"] = $lastPart;
$json = json_encode($content);
$file = EncryptionUtil::openfile($encryptionDir . $UploadId, "w");
fwrite($file, $json);
fclose($file);
}
