* This class currently pins a certificate's Subject Public Key Info as described on
 * [Adam Langley's Weblog][langley]. Pins are either base64 SHA-256 hashes as in
 * [HTTP Public Key Pinning (HPKP)][rfc_7469] or SHA-1 base64 hashes as in Chromium's
 * [static certificates][static_certificates].
 *
 * ## Setting up Certificate Pinning
 *

Und mit allen gleichzeitig kompatibel sein.

///

Erstellen Sie eine Hilfsfunktion, um ein vom Benutzer stammendes Passwort zu hashen.

Und eine weitere, um zu überprüfen, ob ein empfangenes Passwort mit dem gespeicherten Hash übereinstimmt.

Und noch eine, um einen Benutzer zu authentifizieren und zurückzugeben.

 * @since 11.0
 */
@Beta
public interface Hasher extends PrimitiveSink {
  @CanIgnoreReturnValue
  @Override
  Hasher putByte(byte b);

  @CanIgnoreReturnValue
  @Override
  Hasher putBytes(byte[] bytes);

  @CanIgnoreReturnValue
  @Override
  Hasher putBytes(byte[] bytes, int off, int len);

  @CanIgnoreReturnValue
  @Override
  Hasher putBytes(ByteBuffer bytes);

  @CanIgnoreReturnValue

                 * hashes and the other does then they will not be considered equal even
                 * though they may be.
                 */
            }
            return true;
        }
        return false;
    }

    /**
     * Check whether the password hashes are externally supplied.
     *
     * @return whether the hashes are externally supplied
     */

        }
    }

    /**
     * Hashes the specified text using the given algorithm and converts it to a string.
     *
     * @param algorithm
     *            The algorithm. Must not be {@literal null} or an empty string.
     * @param text
     *            The string to be hashed.
     * @return The hashed string.
     */

Siempre que pases exactamente el mismo contenido (exactamente la misma contraseña) obtienes exactamente el mismo galimatías.

Pero no puedes convertir del galimatías de nuevo a la contraseña.

### Por qué usar hashing de contraseñas

Si tu base de datos es robada, el ladrón no tendrá las contraseñas en texto claro de tus usuarios, solo los hashes.

     */

@Beta
public final class HashingOutputStream extends FilterOutputStream {
  private final Hasher hasher;

  /**
   * Creates an output stream that hashes using the given {@link HashFunction}, and forwards all
   * data written to it to the underlying {@link OutputStream}.
   *
   * <p>The {@link OutputStream} should not be written to before or after the hand-off.
   */
  // TODO(user): Evaluate whether it makes sense to always piggyback the computation of a

 */
@Beta
public final class HashingInputStream extends FilterInputStream {
  private final Hasher hasher;

  /**
   * Creates an input stream that hashes using the given {@link HashFunction} and delegates all data
   * read from it to the underlying {@link InputStream}.
   *
   * <p>The {@link InputStream} should not be read from before or after the hand-off.
   */

    public String link;
    /** Path relative to tree from which this referral was thrown */
    public String path; // Path relative to tree from which this referral was thrown
    /** Whether to resolve hashes in the path */
    public boolean resolveHashes;
    /** Expiration time for this referral entry */
    public long expiration;

    /** The next DFS referral in the chain */
    DfsReferral next;