203 lines
5.5 KiB
Java
203 lines
5.5 KiB
Java
/* RC5ParameterSpec.java -- parameters for RC5.
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is 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, or (at your option)
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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; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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 javax.crypto.spec;
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import java.security.spec.AlgorithmParameterSpec;
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/**
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* A wrapper for parameters to the <a
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* href="http://www.rsasecurity.com/rsalabs/faq/3-6-4.html">RC5</a>
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* block cipher.
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*
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* @author Casey Marshall (csm@gnu.org)
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* @since 1.4
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*/
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public class RC5ParameterSpec implements AlgorithmParameterSpec
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{
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// Fields.
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// ------------------------------------------------------------------------
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/** The IV. */
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private byte[] iv;
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/** The number of rounds. */
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private int rounds;
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/** The version number. */
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private int version;
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/** The word size, in bits. */
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private int wordSize;
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// Constructors.
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// ------------------------------------------------------------------------
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/**
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* Create RC5 parameters without an IV.
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*
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* @param version The version number.
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* @param rounds The number of rounds.
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* @param wordSize The size of a word, in bits.
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*/
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public RC5ParameterSpec(int version, int rounds, int wordSize)
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{
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this.version = version;
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this.rounds = rounds;
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this.wordSize = wordSize;
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}
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/**
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* Create RC5 parameters with an IV. The bytes in <code>iv</code> in
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* the range <code>[0, 2*(wordSize/8)-1]</code> are used.
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*
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* @param version The version number.
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* @param rounds The number of rounds.
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* @param wordSize The size of a word, in bits.
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* @param iv The IV data.
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*/
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public RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv)
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{
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this(version, rounds, wordSize, iv, 0);
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}
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/**
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* Create RC5 parameters with an IV. The bytes in <code>iv</code> in
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* the range <code>[off, off+2*(wordSize/8)-1]</code> are used.
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*
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* @param version The version number.
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* @param rounds The number of rounds.
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* @param wordSize The size of a word, in bits.
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* @param iv The IV data.
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* @param off From where in the array the IV starts.
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*/
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public
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RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv, int off)
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{
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this(version, rounds, wordSize);
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int ivLength = 2 * (wordSize / 8);
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if (off < 0)
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throw new IllegalArgumentException();
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if (iv.length - off < ivLength)
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{
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throw new IllegalArgumentException("IV too short");
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}
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this.iv = new byte[ivLength];
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System.arraycopy(iv, off, this.iv, 0, ivLength);
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}
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// Instance methods.
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// ------------------------------------------------------------------------
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/**
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* Return the initializaiton vector, or <code>null</code> if none was
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* specified.
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*
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* @return The IV, or null.
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*/
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public byte[] getIV()
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{
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return iv;
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}
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/**
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* Get the number of rounds.
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*
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* @return The number of rounds.
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*/
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public int getRounds()
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{
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return rounds;
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}
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/**
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* Get the version number.
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*
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* @return The version number.
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*/
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public int getVersion()
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{
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return version;
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}
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/**
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* Get the word size, in bits.
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*
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* @return The word size, in bits.
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*/
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public int getWordSize()
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{
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return wordSize;
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}
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public boolean equals(Object o)
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{
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if (this == o) return true;
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byte[] oiv = ((RC5ParameterSpec) o).getIV();
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if (iv != oiv)
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{
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if (iv == null || oiv == null) return false;
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if (iv.length != oiv.length) return false;
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for (int i = 0; i < iv.length; i++)
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{
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if (iv[i] != oiv[i])
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{
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return false;
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}
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}
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}
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return rounds == ((RC5ParameterSpec) o).getRounds()
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&& version == ((RC5ParameterSpec) o).getVersion()
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&& wordSize == ((RC5ParameterSpec) o).getWordSize();
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}
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public int hashCode()
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{
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int code = rounds + version + wordSize;
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if (iv != null)
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{
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for (int i = 0; i < iv.length; i++)
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{
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code += iv[i];
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}
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}
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return code;
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}
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}
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