验证sha256哈希

我正在尝试验证这个哈希没有被打乱，并使用时间戳来验证。我知道没有暴力就没有办法逆转哈希。以后我该如何进行验证？

有没有我不知道的php代码？

求你了，谢谢你。

$log = fopen($datalog, 'a') or die("can't open file");
echo " ";
echo "IP: ";
echo $address;
$addressHash = hash_hmac('sha256', $address,  $key);
$add64 = base64_encode($addressHash);
fwrite ($log, $add64);
echo " ";
echo "INFO: ";
echo $info;
$infoHash = hash_hmac('sha256', $info,  $key);
$info64 = base64_encode($infoHash);
fwrite ($log, $info64);
echo " ";
echo "TIMESTAMP: ";
echo $datetimeStamp;
$tsHash = hash_hmac('sha256', $datetimeStamp,  $key);
$ts64 = base64_encode($tsHash);
fwrite ($log, $ts64);
echo " ";
echo "COUNTRY: ";
echo $country;
$countryHash = hash_hmac('sha256', $country,  $key);
$country64 = base64_encode($countryHash);
fwrite ($log, $country64);
echo " ";
echo "LATITUDE: ";
echo $lat;
$latHash = hash_hmac('sha256', $lat,  $key);
$lat64 = base64_encode($latHash);
fwrite ($log, $lat64);
echo " ";
echo "LONGITUDE: ";
echo $long;
$longHash = hash_hmac('sha256', $long,  $key);
$long64 = base64_encode($longHash);
fwrite ($log, $long64);
fclose($log);
}