1 /* RC5ParameterSpec.java -- parameters for RC5.
2 Copyright (C) 2004 Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
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12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
39 package javax.crypto.spec;
41 import java.security.spec.AlgorithmParameterSpec;
44 * A wrapper for parameters to the <a
45 * href="http://www.rsasecurity.com/rsalabs/faq/3-6-4.html">RC5</a>
48 * @author Casey Marshall (csm@gnu.org)
51 public class RC5ParameterSpec implements AlgorithmParameterSpec
55 // ------------------------------------------------------------------------
60 /** The number of rounds. */
63 /** The version number. */
66 /** The word size, in bits. */
70 // ------------------------------------------------------------------------
73 * Create RC5 parameters without an IV.
75 * @param version The version number.
76 * @param rounds The number of rounds.
77 * @param wordSize The size of a word, in bits.
79 public RC5ParameterSpec(int version, int rounds, int wordSize)
81 this.version = version;
83 this.wordSize = wordSize;
87 * Create RC5 parameters with an IV. The bytes in <code>iv</code> in
88 * the range <code>[0, 2*(wordSize/8)-1]</code> are used.
90 * @param version The version number.
91 * @param rounds The number of rounds.
92 * @param wordSize The size of a word, in bits.
93 * @param iv The IV data.
95 public RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv)
97 this(version, rounds, wordSize, iv, 0);
101 * Create RC5 parameters with an IV. The bytes in <code>iv</code> in
102 * the range <code>[off, off+2*(wordSize/8)-1]</code> are used.
104 * @param version The version number.
105 * @param rounds The number of rounds.
106 * @param wordSize The size of a word, in bits.
107 * @param iv The IV data.
108 * @param off From where in the array the IV starts.
111 RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv, int off)
113 this(version, rounds, wordSize);
114 int ivLength = 2 * (wordSize / 8);
116 throw new IllegalArgumentException();
117 if (iv.length - off < ivLength)
119 throw new IllegalArgumentException("IV too short");
121 this.iv = new byte[ivLength];
122 System.arraycopy(iv, off, this.iv, 0, ivLength);
126 // ------------------------------------------------------------------------
129 * Return the initializaiton vector, or <code>null</code> if none was
132 * @return The IV, or null.
134 public byte[] getIV()
140 * Get the number of rounds.
142 * @return The number of rounds.
144 public int getRounds()
150 * Get the version number.
152 * @return The version number.
154 public int getVersion()
160 * Get the word size, in bits.
162 * @return The word size, in bits.
164 public int getWordSize()
169 public boolean equals(Object o)
171 if (this == o) return true;
172 byte[] oiv = ((RC5ParameterSpec) o).getIV();
175 if (iv == null || oiv == null) return false;
176 if (iv.length != oiv.length) return false;
177 for (int i = 0; i < iv.length; i++)
185 return rounds == ((RC5ParameterSpec) o).getRounds()
186 && version == ((RC5ParameterSpec) o).getVersion()
187 && wordSize == ((RC5ParameterSpec) o).getWordSize();
190 public int hashCode()
192 int code = rounds + version + wordSize;
195 for (int i = 0; i < iv.length; i++)