pocketmine\network\protocol\LoginPacket::decodeToken PHP Метод

    public function decodeToken($token, $key)
    {
        $tokens = explode(".", $token);
        list($headB64, $payloadB64, $sigB64) = $tokens;
        if ($key !== null and extension_loaded("openssl")) {
            $sig = base64_decode(strtr($sigB64, '-_', '+/'), true);
            $rawLen = 48;
            // ES384
            for ($i = $rawLen; $i > 0 and $sig[$rawLen - $i] == chr(0); $i--) {
            }
            $j = $i + (ord($sig[$rawLen - $i]) >= 128 ? 1 : 0);
            for ($k = $rawLen; $k > 0 and $sig[2 * $rawLen - $k] == chr(0); $k--) {
            }
            $l = $k + (ord($sig[2 * $rawLen - $k]) >= 128 ? 1 : 0);
            $len = 2 + $j + 2 + $l;
            $derSig = chr(48);
            if ($len > 255) {
                throw new \RuntimeException("Invalid signature format");
            } elseif ($len >= 128) {
                $derSig .= chr(81);
            }
            $derSig .= chr($len) . chr(2) . chr($j);
            $derSig .= str_repeat(chr(0), $j - $i) . substr($sig, $rawLen - $i, $i);
            $derSig .= chr(2) . chr($l);
            $derSig .= str_repeat(chr(0), $l - $k) . substr($sig, 2 * $rawLen - $k, $k);
            $verified = openssl_verify($headB64 . "." . $payloadB64, $derSig, "-----BEGIN PUBLIC KEY-----\n" . wordwrap($key, 64, "\n", true) . "\n-----END PUBLIC KEY-----\n", OPENSSL_ALGO_SHA384) === 1;
        } else {
            $verified = false;
        }
        return array($verified, json_decode(base64_decode($payloadB64), true));
    }