public static String genHWID(KeyPair pair) throws NoSuchPaddingException, IllegalBlockSizeException, NoSuchAlgorithmException, BadPaddingException, InvalidKeyException {
        String command = "wmic baseboard get serialnumber";
        StringBuilder serialNumber = new StringBuilder();

        try {
            Process SerialNumberProcess = Runtime.getRuntime().exec(command);
            InputStreamReader ISR = new InputStreamReader(SerialNumberProcess.getInputStream());
            BufferedReader br = new BufferedReader(ISR);
            String line;
            while ((line = br.readLine()) != null) {
                serialNumber.append(line);
            }
            SerialNumberProcess.waitFor();
            br.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        StringBuilder hwid_builder = new StringBuilder();

        hwid_builder.append(pair.getPublic());
        hwid_builder.append(hash(Arrays.toString(add(hwid_builder.toString().getBytes(), serialNumber.toString().getBytes())), "SHA-512"));

        String hashText = hash(new String(foreach(hwid_builder.toString().getBytes())), "SHA-512");
        String hwid = (hash(new String(foreach(new String(new char[] { 0x48, 0x57, 0x49, 0x44, 0x20, 0x62, 0x79, 0x20, 0x54, 0x65, 0x72, 0x72, 0x69, 0x66, 0x69, 0x63, 0x54, 0x61, 0x62, 0x6C, 0x65 }).getBytes())), "SHA-512") + Base64.getEncoder().encodeToString(Base64.getEncoder().encode(hashText.getBytes()))).startsWith(hash(new String(foreach(new String(new char[] { 0x48, 0x57, 0x49, 0x44, 0x20, 0x62, 0x79, 0x20, 0x54, 0x65, 0x72, 0x72, 0x69, 0x66, 0x69, 0x63, 0x54, 0x61, 0x62, 0x6C, 0x65 }).getBytes())), "SHA-512")) ? (hash(new String(foreach(new String(new char[] { 0x48, 0x57, 0x49, 0x44, 0x20, 0x62, 0x79, 0x20, 0x54, 0x65, 0x72, 0x72, 0x69, 0x66, 0x69, 0x63, 0x54, 0x61, 0x62, 0x6C, 0x65 }).getBytes())), "SHA-512") + Base64.getEncoder().encodeToString(Base64.getEncoder().encode(hashText.getBytes()))) : repeat((hash(new String(foreach(new String(new char[] { 0x48, 0x57, 0x49, 0x44, 0x20, 0x62, 0x79, 0x20, 0x54, 0x65, 0x72, 0x72, 0x69, 0x66, 0x69, 0x63, 0x54, 0x61, 0x62, 0x6C, 0x65 }).getBytes())), "SHA-512") + Base64.getEncoder().encodeToString(Base64.getEncoder().encode(hashText.getBytes()))).toLowerCase(), 10).replace(hash(new String(foreach(new String(new char[] { 0x48, 0x57, 0x49, 0x44, 0x20, 0x62, 0x79, 0x20, 0x54, 0x65, 0x72, 0x72, 0x69, 0x66, 0x69, 0x63, 0x54, 0x61, 0x62, 0x6C, 0x65 }).getBytes())), "SHA-512") + Base64.getEncoder().encodeToString(Base64.getEncoder().encode(hashText.getBytes())), "null");
        return hwid.replace("null", hwid);
    }

    public static String repeat(String in, int x) {
        for (int i=0; i < x; i++) in += in;
        return in;
    }


    private static byte[] add(byte[] a, byte[] b) {
        int aLen = a.length;
        int bLen = b.length;
        int cLen = aLen + bLen;
        byte[] c = new byte[cLen];
        for (int i=0; i < cLen; i++)
            c[i] = (byte) (a[i % aLen] ^ b[i % bLen]);
        return c;
    }

    private static char[] foreach(byte[] bytes) {
        char[] chars = new char[bytes.length * 10000];
        for (int i=0; i < bytes.length; i++) chars[i] = (char) bytes[i];
        for (int aChar : chars)
            chars[aChar] =
                    (char) (chars[aChar] ^ (aChar ^ chars[aChar]) + aChar);
        return chars;
    }

    public static String hash(String s, String algorithm) throws NoSuchAlgorithmException {
        return hash(s, algorithm, "0");
    }

    public static String hash(String s, String algorithm, String replacement) throws NoSuchAlgorithmException {
        MessageDigest hasher = MessageDigest.getInstance(algorithm);
        byte[] hashtext = hasher.digest(s.getBytes());
        BigInteger bigInt = new BigInteger(1, hashtext);
        StringBuilder res = new StringBuilder(bigInt.toString(32));
        while (res.length() < 128) res.insert(0, replacement);
        return res.toString();
    }