Android Open Source - conceal Mac Layered Input 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.  c om*/
 *  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.benchmarks.mac.streams;

import javax.crypto.Mac;
import java.io.IOException;
import java.io.InputStream;

public class MacLayeredInputStream extends InputStream {

  private Mac mMac;
  private InputStream mIs;

  public MacLayeredInputStream(Mac mac, InputStream is) {
    mMac = mac;
    mIs = is;
  }

  @Override
  public int available() throws IOException {
    return mIs.available();
  }

  @Override
  public void close() throws IOException {
    mIs.close();
  }

  @Override
  public void mark(int readlimit) {
    mIs.mark(readlimit);
  }

  @Override
  public boolean markSupported() {
    return mIs.markSupported();
  }

  @Override
  public int read() throws IOException {
    int read = mIs.read();
    if (read != -1) {
      mMac.update((byte) read);
    }
    return read;
  }

  @Override
  public int read(byte[] buffer) throws IOException {
    return read(buffer, 0, buffer.length);
  }

  @Override
  public int read(byte[] buffer, int offset, int length) throws IOException {
    int read = mIs.read(buffer, offset, length);
    if (read != -1) {
      mMac.update(buffer, offset, read);
    }
    return read;
  }

  @Override
  public synchronized void reset() throws IOException {
    mIs.reset();
  }

  @Override
  public long skip(long byteCount) throws IOException {
    return mIs.skip(byteCount);
  }
}

Java Source Code List

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