| /* RC2ParameterSpec.java -- Wrapper for RC2 parameters. |
| 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 for the <a |
| * href="http://www.rsasecurity.com/rsalabs/faq/3-6-2.html">RC2</a> |
| * block cipher ("RC" means either "Rivest Cipher" or "Ron's Code", |
| * depending upon who you ask and when). |
| * |
| * @author Casey Marshall (csm@gnu.org) |
| * @since 1.4 |
| */ |
| public class RC2ParameterSpec implements AlgorithmParameterSpec |
| { |
| |
| // Constants and fields. |
| // ------------------------------------------------------------------------ |
| |
| /** The length of an RC2 IV, in bytes. */ |
| private static final int RC2_IV_LENGTH = 8; |
| |
| /** The effective key length, in bits. */ |
| private int effectiveKeyBits; |
| |
| /** The initialization vector. */ |
| private byte[] iv; |
| |
| // Constructors. |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Create RC2 parameters without an IV. |
| * |
| * @param effectiveKeyBits The number of effective key bits. |
| */ |
| public RC2ParameterSpec(int effectiveKeyBits) |
| { |
| this.effectiveKeyBits = effectiveKeyBits; |
| } |
| |
| /** |
| * Create RC2 parameters with an IV. |
| * |
| * @param effectiveKeyBits The number of effective key bits. |
| * @param iv The IV; the first eight bytes of this array |
| * are used. |
| */ |
| public RC2ParameterSpec(int effectiveKeyBits, byte[] iv) |
| { |
| this(effectiveKeyBits, iv, 0); |
| } |
| |
| /** |
| * Create RC2 parameters with an IV. |
| * |
| * @param effectiveKeyBits The number of effective key bits. |
| * @param iv The IV; the first eight bytes of this array |
| * after <code>offset</code> are used. |
| * @param offset From whence to start in the array. |
| */ |
| public RC2ParameterSpec(int effectiveKeyBits, byte[] iv, int offset) |
| { |
| if (iv.length - offset < RC2_IV_LENGTH) |
| { |
| throw new IllegalArgumentException("IV too short"); |
| } |
| this.effectiveKeyBits = effectiveKeyBits; |
| this.iv = new byte[RC2_IV_LENGTH]; |
| System.arraycopy(iv, offset, this.iv, 0, RC2_IV_LENGTH); |
| } |
| |
| // Instance methods. |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * Get the number of effective key bits. |
| * |
| * @return The numer of effective key bits. |
| */ |
| public int getEffectiveKeyBits() |
| { |
| return effectiveKeyBits; |
| } |
| |
| /** |
| * Return the initialization vector, or <code>null</code> if none was |
| * specified. |
| * |
| * @return The IV, or null. |
| */ |
| public byte[] getIV() |
| { |
| return iv; |
| } |
| |
| public boolean equals(Object o) |
| { |
| if (this == o) return true; |
| byte[] oiv = ((RC2ParameterSpec) 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 effectiveKeyBits == ((RC2ParameterSpec) o).getEffectiveKeyBits(); |
| } |
| |
| public int hashCode() |
| { |
| int code = effectiveKeyBits; |
| if (iv != null) |
| { |
| for (int i = 0; i < RC2_IV_LENGTH; i++) |
| { |
| code += iv[i]; |
| } |
| } |
| return code; |
| } |
| } |