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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [gnu/] [javax/] [crypto/] [mac/] [MacOutputStream.java] - Blame information for rev 769

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1 769 jeremybenn
/* MacOutputStream.java --
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   Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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This file is a part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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USA
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version.  */
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package gnu.javax.crypto.mac;
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import java.io.FilterOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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/**
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 * A filtering output stream that computes a MAC (message authentication code)
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 * over all data written to the stream.
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 */
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public class MacOutputStream
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    extends FilterOutputStream
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{
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  /** The digesting state. The MAC is updated only if this flag is true. */
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  private boolean digesting;
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  /** The MAC being updated. */
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  private IMac mac;
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  /**
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   * Creates a new <code>MacOutputStream</code>. The stream is initially set
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   * to digest data written, the <code>mac</code> argument must have already
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   * been initialized, and the <code>mac</code> argument is <b>not</b>
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   * cloned.
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   *
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   * @param out The underlying output stream.
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   * @param mac The mac instance to use.
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   */
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  public MacOutputStream(OutputStream out, IMac mac)
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  {
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    super(out);
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    if (mac == null)
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      throw new NullPointerException();
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    this.mac = mac;
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    digesting = true;
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  }
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  /**
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   * Returns the MAC this stream is updating.
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   *
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   * @return The MAC.
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   */
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  public IMac getMac()
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  {
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    return mac;
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  }
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  /**
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   * Sets the MAC this stream is updating, which must have already been
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   * initialized. The argument is not cloned by this method.
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   *
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   * @param mac The non-null new MAC.
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   * @throws NullPointerException If the argument is null.
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   */
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  public void setMac(IMac mac)
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  {
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    if (mac == null)
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      throw new NullPointerException();
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    this.mac = mac;
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  }
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  /**
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   * Turns the digesting state on or off. When off, the MAC will not be updated
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   * when data is written to the stream.
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   *
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   * @param flag The new digesting state.
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   */
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  public void on(boolean flag)
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  {
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    digesting = flag;
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  }
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  public void write(int b) throws IOException
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  {
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    if (digesting)
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      mac.update((byte) b);
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    out.write(b);
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  }
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  public void write(byte[] buf, int off, int len) throws IOException
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  {
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    if (digesting)
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      mac.update(buf, off, len);
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    out.write(buf, off, len);
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  }
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}

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