josemmo

byte[] ip = subnetLocalhost.getAddress();
for (int i=1; i<255; i++) {
  ip[3] = (byte) i;
  InetAddress address = InetAddress.getByAddress(ip);
  // Comprobar que se añade esta máquina
  if (address.equals(localhost)) continue;
  // Intentar abrir socket TCP
  connectToServer(address);
}

josemmo

new Thread(() -> {
  server = new ServerSocket(Cutrecoin.PORT);
  while (isRunning) acceptClient(server.accept());
}).start();

josemmo

public void mine() {
  while (!isValidHash()) {
    nonce++;
    recalculateHash();
  }
}

josemmo

private final long index;
private final ArrayList<Transaction> transactions;
private long nonce = 0;
private String hash;
private final String previous_hash;
private final PublicKey miner;
private final float fee;

josemmo

public float getBalance(PublicKey addr) {
  float balance = 0;
  for (Block b : chain) {
    // Añadir saldo de transacciones
    for (Transaction t : b.getTransactions()) {
      if (addr.equals(t.getFrom())) {
        // En caso de ser el pagador
        balance -= t.getAmount();
      } else if (addr.equals(t.getTo())) {
        // En caso de ser el receptor

josemmo

public boolean sign(PrivateKey pk) {
  // Comprobar que no está firmada la transacción
  if (signature != null) return false;
  // Comprobar que la clave privada se corresponde con esta transacción
  PublicKey expected = getPublicFromPrivate(pk);
  if (!expected.equals(from)) return false;
  // Intentar firmar la transacción
  try {
    Signature sig = Signature.getInstance("SHA1WithRSA");
    // Especificar clave privada

josemmo

private final PublicKey from;
private final PublicKey to;
private final float amount;
private final Date timestamp;
private byte[] signature = null;

josemmo

public static String keyToBase64(Key key) {
  return Base64.getEncoder().encodeToString(key.getEncoded());
}

josemmo

public static KeyPair generateKeyPair() {
  KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
  kpg.initialize(1024);
  return kpg.genKeyPair();
}

josemmo

// Detectar Developer Tools abierto
var tolerance = 300;
var dev_open = (diff > tolerance);

// Mostrar mensaje de error
if (dev_open) {
  document.body.innerHTML = 'Cierra las Developer Tools y recarga la web';
}