f911ba985a
From-SVN: r102074
167 lines
4.9 KiB
Java
167 lines
4.9 KiB
Java
/* RC2ParameterSpec.java -- Wrapper for RC2 parameters.
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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 for the <a
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* href="http://www.rsasecurity.com/rsalabs/faq/3-6-2.html">RC2</a>
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* block cipher ("RC" means either "Rivest Cipher" or "Ron's Code",
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* depending upon who you ask and when).
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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 RC2ParameterSpec implements AlgorithmParameterSpec
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{
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// Constants and fields.
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// ------------------------------------------------------------------------
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/** The length of an RC2 IV, in bytes. */
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private static final int RC2_IV_LENGTH = 8;
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/** The effective key length, in bits. */
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private int effectiveKeyBits;
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/** The initialization vector. */
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private byte[] iv;
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// Constructors.
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// ------------------------------------------------------------------------
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/**
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* Create RC2 parameters without an IV.
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*
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* @param effectiveKeyBits The number of effective key bits.
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*/
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public RC2ParameterSpec(int effectiveKeyBits)
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{
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this.effectiveKeyBits = effectiveKeyBits;
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}
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/**
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* Create RC2 parameters with an IV.
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*
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* @param effectiveKeyBits The number of effective key bits.
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* @param iv The IV; the first eight bytes of this array
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* are used.
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*/
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public RC2ParameterSpec(int effectiveKeyBits, byte[] iv)
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{
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this(effectiveKeyBits, iv, 0);
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}
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/**
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* Create RC2 parameters with an IV.
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*
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* @param effectiveKeyBits The number of effective key bits.
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* @param iv The IV; the first eight bytes of this array
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* after <code>offset</code> are used.
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* @param offset From whence to start in the array.
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*/
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public RC2ParameterSpec(int effectiveKeyBits, byte[] iv, int offset)
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{
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if (iv.length - offset < RC2_IV_LENGTH)
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{
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throw new IllegalArgumentException("IV too short");
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}
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this.effectiveKeyBits = effectiveKeyBits;
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this.iv = new byte[RC2_IV_LENGTH];
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System.arraycopy(iv, offset, this.iv, 0, RC2_IV_LENGTH);
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}
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// Instance methods.
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// ------------------------------------------------------------------------
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/**
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* Get the number of effective key bits.
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*
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* @return The numer of effective key bits.
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*/
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public int getEffectiveKeyBits()
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{
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return effectiveKeyBits;
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}
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/**
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* Return the initialization 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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public boolean equals(Object o)
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{
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if (this == o) return true;
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byte[] oiv = ((RC2ParameterSpec) 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 effectiveKeyBits == ((RC2ParameterSpec) o).getEffectiveKeyBits();
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}
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public int hashCode()
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{
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int code = effectiveKeyBits;
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if (iv != null)
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{
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for (int i = 0; i < RC2_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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