ideakeyspec.java

面向应用的智能安全代理平台和工具包是一个综合网络应用的安全共性需求而设计和实现的一个通用性的网络信息安全应用支撑平台

package au.net.aba.crypto.spec;

/*
 * $Id: IDEAKeySpec.java,v 1.4 1998/10/05 05:47:55 dgh Exp $
 * $Author: dgh $
 *
 * Copyright (C) 1996-1998 Australian Business Access Pty Ltd.
 * All rights reserved.
 * 
 * Use, modification, copying and distribution of this software is subject the
 * terms and conditions of the ABA Public Licence. See the file
 * "PUBLIC_LICENCE" for additional information.
 *
 * If you have not received a copy of the Public Licence, you must destroy all
 * copies of this file immediately. 
 *
 * $Source: /aba/CVSROOT/jdk1.1/src/au.net.aba/crypto/spec/IDEAKeySpec.java,v $
 * $Revision: 1.4 $
 * $Date: 1998/10/05 05:47:55 $
 * $State: Exp $
 */

import java.security.spec.KeySpec;
import java.security.InvalidKeyException;

/**
 * A class that provides a specification for a IDEA key.
 */
public class IDEAKeySpec implements KeySpec
{
	public final static String ident = "$Id: IDEAKeySpec.java,v 1.4 1998/10/05 05:47:55 dgh Exp $";

	private byte[]	ideaKey;

	public static final int IDEA_KEY_LEN = 16;

	/**
	 * Uses the first 16 bytes in key as the IDEA key 
	 *
	 * @param key   the byte array to use as key material.
	 * @exception InvalidKeyException if the key material is too short.
	 */
	public IDEAKeySpec(
		byte[]	key)
		throws InvalidKeyException
	{
		this(key, 0);
	}
	/**
	 * Uses the first 16 bytes in key, beginning at offset, as the IDEA key
	 *
	 * @param key           the byte array to use as key material.
	 * @param offset        the offset to start at.
	 * @exception InvalidKeyException if the key material is too short.
	 */
	public IDEAKeySpec(
		byte[]	key,
		int	offset)
		throws InvalidKeyException
	{
		if (key.length - offset < IDEA_KEY_LEN)
		{
			throw new InvalidKeyException("Key too short");
		}
		ideaKey = new byte[IDEA_KEY_LEN];
		System.arraycopy(key, offset, ideaKey, 0, IDEA_KEY_LEN);
	}
	/**
	 * Returns the IDEA key.
	 *
	 * @return the bytes making up the key.
	 */
	public byte[] getKey()
	{
		return ideaKey;
	}
}