127 lines
4.7 KiB
Java
127 lines
4.7 KiB
Java
/*
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* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.crypto.spec;
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import java.security.InvalidKeyException;
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/**
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* This class specifies a DES-EDE ("triple-DES") key.
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*
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* @author Jan Luehe
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*
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* @since 1.4
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*/
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public class DESedeKeySpec implements java.security.spec.KeySpec {
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/**
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* The constant which defines the length of a DESede key in bytes.
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*/
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public static final int DES_EDE_KEY_LEN = 24;
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private byte[] key;
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/**
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* Creates a DESedeKeySpec object using the first 24 bytes in
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* <code>key</code> as the key material for the DES-EDE key.
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*
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* <p> The bytes that constitute the DES-EDE key are those between
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* <code>key[0]</code> and <code>key[23]</code> inclusive
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*
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* @param key the buffer with the DES-EDE key material. The first
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* 24 bytes of the buffer are copied to protect against subsequent
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* modification.
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*
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* @exception NullPointerException if <code>key</code> is null.
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* @exception InvalidKeyException if the given key material is shorter
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* than 24 bytes.
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*/
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public DESedeKeySpec(byte[] key) throws InvalidKeyException {
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this(key, 0);
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}
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/**
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* Creates a DESedeKeySpec object using the first 24 bytes in
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* <code>key</code>, beginning at <code>offset</code> inclusive,
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* as the key material for the DES-EDE key.
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*
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* <p> The bytes that constitute the DES-EDE key are those between
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* <code>key[offset]</code> and <code>key[offset+23]</code> inclusive.
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*
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* @param key the buffer with the DES-EDE key material. The first
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* 24 bytes of the buffer beginning at <code>offset</code> inclusive
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* are copied to protect against subsequent modification.
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* @param offset the offset in <code>key</code>, where the DES-EDE key
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* material starts.
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*
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* @exception NullPointerException if <code>key</code> is null.
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* @exception InvalidKeyException if the given key material, starting at
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* <code>offset</code> inclusive, is shorter than 24 bytes
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*/
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public DESedeKeySpec(byte[] key, int offset) throws InvalidKeyException {
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if (key.length - offset < 24) {
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throw new InvalidKeyException("Wrong key size");
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}
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this.key = new byte[24];
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System.arraycopy(key, offset, this.key, 0, 24);
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}
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/**
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* Returns the DES-EDE key.
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*
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* @return the DES-EDE key. Returns a new array
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* each time this method is called.
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*/
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public byte[] getKey() {
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return this.key.clone();
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}
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/**
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* Checks if the given DES-EDE key, starting at <code>offset</code>
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* inclusive, is parity-adjusted.
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*
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* @param key a byte array which holds the key value
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* @param offset the offset into the byte array
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* @return true if the given DES-EDE key is parity-adjusted, false
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* otherwise
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*
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* @exception NullPointerException if <code>key</code> is null.
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* @exception InvalidKeyException if the given key material, starting at
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* <code>offset</code> inclusive, is shorter than 24 bytes
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*/
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public static boolean isParityAdjusted(byte[] key, int offset)
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throws InvalidKeyException {
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if (key.length - offset < 24) {
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throw new InvalidKeyException("Wrong key size");
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}
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if (DESKeySpec.isParityAdjusted(key, offset) == false
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|| DESKeySpec.isParityAdjusted(key, offset + 8) == false
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|| DESKeySpec.isParityAdjusted(key, offset + 16) == false) {
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return false;
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}
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return true;
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}
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}
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