| /* RC5ParameterSpec.java -- parameters for RC5. |
| 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. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| 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. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 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 |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package javax.crypto.spec; |
| |
| import java.security.spec.AlgorithmParameterSpec; |
| |
| /** |
| * A wrapper for parameters to the <a |
| * href="http://www.rsasecurity.com/rsalabs/faq/3-6-4.html">RC5</a> |
| * block cipher. |
| * |
| * @author Casey Marshall (csm@gnu.org) |
| * @since 1.4 |
| */ |
| public class RC5ParameterSpec implements AlgorithmParameterSpec |
| { |
| |
| // Fields. |
| // ------------------------------------------------------------------------ |
| |
| /** The IV. */ |
| private byte[] iv; |
| |
| /** The number of rounds. */ |
| private int rounds; |
| |
| /** The version number. */ |
| private int version; |
| |
| /** The word size, in bits. */ |
| private int wordSize; |
| |
| // Constructors. |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Create RC5 parameters without an IV. |
| * |
| * @param version The version number. |
| * @param rounds The number of rounds. |
| * @param wordSize The size of a word, in bits. |
| */ |
| public RC5ParameterSpec(int version, int rounds, int wordSize) |
| { |
| this.version = version; |
| this.rounds = rounds; |
| this.wordSize = wordSize; |
| } |
| |
| /** |
| * Create RC5 parameters with an IV. The bytes in <code>iv</code> in |
| * the range <code>[0, 2*(wordSize/8)-1]</code> are used. |
| * |
| * @param version The version number. |
| * @param rounds The number of rounds. |
| * @param wordSize The size of a word, in bits. |
| * @param iv The IV data. |
| */ |
| public RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv) |
| { |
| this(version, rounds, wordSize, iv, 0); |
| } |
| |
| /** |
| * Create RC5 parameters with an IV. The bytes in <code>iv</code> in |
| * the range <code>[off, off+2*(wordSize/8)-1]</code> are used. |
| * |
| * @param version The version number. |
| * @param rounds The number of rounds. |
| * @param wordSize The size of a word, in bits. |
| * @param iv The IV data. |
| * @param off From where in the array the IV starts. |
| */ |
| public |
| RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv, int off) |
| { |
| this(version, rounds, wordSize); |
| int ivLength = 2 * (wordSize / 8); |
| if (off < 0) |
| throw new IllegalArgumentException(); |
| if (iv.length - off < ivLength) |
| { |
| throw new IllegalArgumentException("IV too short"); |
| } |
| this.iv = new byte[ivLength]; |
| System.arraycopy(iv, off, this.iv, 0, ivLength); |
| } |
| |
| // Instance methods. |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Return the initializaiton vector, or <code>null</code> if none was |
| * specified. |
| * |
| * @return The IV, or null. |
| */ |
| public byte[] getIV() |
| { |
| return iv; |
| } |
| |
| /** |
| * Get the number of rounds. |
| * |
| * @return The number of rounds. |
| */ |
| public int getRounds() |
| { |
| return rounds; |
| } |
| |
| /** |
| * Get the version number. |
| * |
| * @return The version number. |
| */ |
| public int getVersion() |
| { |
| return version; |
| } |
| |
| /** |
| * Get the word size, in bits. |
| * |
| * @return The word size, in bits. |
| */ |
| public int getWordSize() |
| { |
| return wordSize; |
| } |
| |
| public boolean equals(Object o) |
| { |
| if (this == o) return true; |
| byte[] oiv = ((RC5ParameterSpec) o).getIV(); |
| if (iv != oiv) |
| { |
| if (iv == null || oiv == null) return false; |
| if (iv.length != oiv.length) return false; |
| for (int i = 0; i < iv.length; i++) |
| { |
| if (iv[i] != oiv[i]) |
| { |
| return false; |
| } |
| } |
| } |
| return rounds == ((RC5ParameterSpec) o).getRounds() |
| && version == ((RC5ParameterSpec) o).getVersion() |
| && wordSize == ((RC5ParameterSpec) o).getWordSize(); |
| } |
| |
| public int hashCode() |
| { |
| int code = rounds + version + wordSize; |
| if (iv != null) |
| { |
| for (int i = 0; i < iv.length; i++) |
| { |
| code += iv[i]; |
| } |
| } |
| return code; |
| } |
| } |