WD - Dev
42 lines
1.3 KiB
PHP
42 lines
1.3 KiB
PHP
<?php
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define('SECRET_KEY', 2704960011);
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// Enkripsi ID -> format: MP-<salt><middle>-<checksum>
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function encryptNumberID($id) {
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$salt = rand(100, 999); // 3 digit salt
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$raw = ($id + $salt) * SECRET_KEY;
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$middle = substr(str_pad($raw, 12, '0', STR_PAD_LEFT), 0, 7); // bagian dienkripsi
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$checksum = substr(strval(($id * 97 + $salt) % 100000), -5); // 5 digit checksum
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return "MP-$salt$middle-$checksum";
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}
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// Dekripsi berdasarkan salt yang sudah ditanam
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function decryptNumberID($encrypted) {
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if (!preg_match('/^MP-(\d{10})-(\d{5})$/', $encrypted, $matches)) {
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return null;
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}
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$salt = intval(substr($matches[1], 0, 3)); // 3 digit salt di awal
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$middle = substr($matches[1], 3); // 7 digit encode
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$checksum = $matches[2];
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$maxTries = 100000; // Maksimal 100.000 iterasi, tidak sampai 9 juta
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for ($id = 1; $id <= $maxTries; $id++) {
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$raw = ($id + $salt) * SECRET_KEY;
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$encoded = substr(str_pad($raw, 12, '0', STR_PAD_LEFT), 0, 7);
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if ($encoded !== $middle) {
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continue; // langsung skip jika encode beda
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}
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// Jika middle cocok, baru cek checksum
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$check = substr(strval(($id * 97 + $salt) % 100000), -5);
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if ($check === $checksum) {
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return $id; // ketemu
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}
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}
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return null; // tidak ditemukan
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} |