Android Open Source - conceal Native Mac Layered Output Stream

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License

The source code is released under:

BSD License For Conceal software Copyright (c) 2014, Facebook, Inc. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that...

Java Source Code

/*
 *  Copyright (c) 2014, Facebook, Inc./*from   w  w w . j  a v  a  2 s  .  co m*/
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 *
 */

package com.facebook.crypto.streams;

import com.facebook.crypto.mac.NativeMac;

import java.io.IOException;
import java.io.OutputStream;

public class NativeMacLayeredOutputStream extends OutputStream {

  private final NativeMac mMac;
  private final OutputStream mOutputDelegate;

  /**
   * Creates a new output stream to write to.
   *
   * @param mac The object used to compute the mac.
   * @param outputDelegate The stream to write data to.
   */
  public NativeMacLayeredOutputStream(NativeMac mac, OutputStream outputDelegate) {
    mMac = mac;
    mOutputDelegate = outputDelegate;
  }

  @Override
  public void close() throws IOException {
    try {
      byte[] mac = mMac.doFinal();
      mOutputDelegate.write(mac);
    } finally {
      try {
        mOutputDelegate.close();
      } finally {
        mMac.destroy();
      }
    }
  }

  @Override
  public void flush() throws IOException {
    mOutputDelegate.flush();
  }

  @Override
  public void write(byte[] buffer) throws IOException {
    write(buffer, 0, buffer.length);
  }

  @Override
  public void write(byte[] buffer, int offset, int count) throws IOException {
    mMac.update(buffer, offset, count);
    mOutputDelegate.write(buffer, offset, count);
  }

  @Override
  public void write(int oneByte) throws IOException {
    mMac.update((byte) oneByte);
    mOutputDelegate.write(oneByte);
  }
}

Java Source Code List

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