# Aplicaciones más grandes - Múltiples archivos { #bigger-applications-multiple-files }

Si estás construyendo una aplicación o una API web, rara vez podrás poner todo en un solo archivo.

**FastAPI** proporciona una herramienta conveniente para estructurar tu aplicación manteniendo toda la flexibilidad.

/// info | Información

Si vienes de Flask, esto sería el equivalente a los Blueprints de Flask.

///

# Aplicações Maiores - Múltiplos Arquivos { #bigger-applications-multiple-files }

Se você está construindo uma aplicação ou uma API web, é raro que você possa colocar tudo em um único arquivo.

**FastAPI** oferece uma ferramenta conveniente para estruturar sua aplicação, mantendo toda a flexibilidade.

/// info | Informação

Se você vem do Flask, isso seria o equivalente aos Blueprints do Flask.

///

</p>

<pre>
a[low : high]
</pre>

<p>
constructs a substring or slice.
The <i>indices</i> <code>low</code> and
<code>high</code> select which elements of operand <code>a</code> appear
in the result. The result has indices starting at 0 and length equal to
<code>high</code>&nbsp;-&nbsp;<code>low</code>.
After slicing the array <code>a</code>
</p>

      }
      // We need to ensure that at least 4 bytes have been put into the hasher or else
      // Hasher#hash will throw an ISE.
      int intToPut = random.nextInt();
      for (Hasher hasher : sinksAndControl) {
        hasher.putInt(intToPut);
      }
      for (Sink sink : sinks) {
        HashCode unused = sink.hash();
      }

    this.checksumSupplier = checkNotNull(checksumSupplier);
    checkArgument(bits == 32 || bits == 64, "bits (%s) must be either 32 or 64", bits);
    this.bits = bits;
    this.toString = checkNotNull(toString);
  }

  @Override
  public int bits() {
    return bits;
  }

  @Override
  public Hasher newHasher() {
    return new ChecksumHasher(checksumSupplier.get());
  }

  @Override
  public String toString() {

  }

  private Hasher fromHashers(Hasher[] hashers) {
    return new Hasher() {
      @Override
      public Hasher putByte(byte b) {
        for (Hasher hasher : hashers) {
          hasher.putByte(b);
        }
        return this;
      }

      @Override
      public Hasher putBytes(byte[] bytes) {
        for (Hasher hasher : hashers) {
          hasher.putBytes(bytes);
        }

public class CachedCipherTest {

    @Test
    public void testEncryptDecryptBytes() {
        final CachedCipher cipher = new CachedCipher();
        cipher.setKey("mySecretKey");

        final byte[] original = "Hello World".getBytes();
        final byte[] encrypted = cipher.encrypt(original);
        final byte[] decrypted = cipher.decrypt(encrypted);

        assertThat(encrypted, is(not(original)));

    super(checkNotNull(in));
    this.hasher = checkNotNull(hashFunction.newHasher());
  }

  /**
   * Reads the next byte of data from the underlying input stream and updates the hasher with the
   * byte read.
   */
  @Override
  @CanIgnoreReturnValue
  public int read() throws IOException {
    int b = in.read();
    if (b != -1) {
      hasher.putByte((byte) b);
    }
    return b;
  }

  /**

 */
@NullUnmarked
public class HashingOutputStreamTest extends TestCase {
  private Hasher hasher;
  private HashFunction hashFunction;
  private final ByteArrayOutputStream buffer = new ByteArrayOutputStream();

  @SuppressWarnings("DoNotMock")
  @Override
  protected void setUp() throws Exception {
    super.setUp();
    hasher = mock(Hasher.class);
    hashFunction = mock(HashFunction.class);

 */

package jcifs.smb1.util;

/**
 * Implementation of the RC4 (ARCFOUR) stream cipher algorithm.
 * This class provides RC4 encryption/decryption functionality used in SMB1 protocol operations.
 */
public class RC4 {

    byte[] s;
    int i, j;

    /**
     * Default constructor for RC4 cipher.
     * Call init() to initialize with a key before use.
     */
    public RC4() {
    }

    /**