/* NullCipher.java -- The identity cipher.
   Copyright (C) 2004  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

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WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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along with GNU Classpath; see the file COPYING.  If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
combination.

As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
modules, and to copy and distribute the resulting executable under
terms of your choice, provided that you also meet, for each linked
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package javax.crypto;

/**
 * Trivial subclass of Cipher that implements the <i>identity
 * transformation</i>, where the input is always copied to the output
 * unchanged. Null ciphers can be instantiated with the public
 * constructor.
 *
 * @author Casey Marshall (csm@gnu.org)
 */
public class NullCipher extends Cipher
{

  // Constructor.
  // ------------------------------------------------------------------------

  /**
   * Create a new identity cipher.
   */
  public NullCipher()
  {
    super(new NullCipherImpl(), null, "NULL");
  }
}