/*
* Copyright (c) 1997, 2007, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package com.sun.crypto.provider;
import java.security.KeyRep;
import java.security.InvalidKeyException;
import javax.crypto.SecretKey;
import javax.crypto.spec.DESedeKeySpec;
/**
* This class represents a DES-EDE key.
*
* @author Jan Luehe
*
*/
final class DESedeKey implements SecretKey {
static final long serialVersionUID = 2463986565756745178L;
private byte[] key;
/**
* Creates a DES-EDE key from a given key.
*
* @param key the given key
*
* @exception InvalidKeyException if the given key has a wrong size
*/
DESedeKey(byte[] key) throws InvalidKeyException {
this(key, 0);
}
/**
* Uses the first 24 bytes in <code>key</code>, beginning at
* <code>offset</code>, as the DES-EDE key
*
* @param key the buffer with the DES-EDE key
* @param offset the offset in <code>key</code>, where the DES-EDE key
* starts
*
* @exception InvalidKeyException if the given key has a wrong size
*/
DESedeKey(byte[] key, int offset) throws InvalidKeyException {
if (key==null || ((key.length-offset)<DESedeKeySpec.DES_EDE_KEY_LEN)) {
throw new InvalidKeyException("Wrong key size");
}
this.key = new byte[DESedeKeySpec.DES_EDE_KEY_LEN];
System.arraycopy(key, offset, this.key, 0,
DESedeKeySpec.DES_EDE_KEY_LEN);
DESKeyGenerator.setParityBit(this.key, 0);
DESKeyGenerator.setParityBit(this.key, 8);
DESKeyGenerator.setParityBit(this.key, 16);
}
public byte[] getEncoded() {
return (byte[])this.key.clone();
}
public String getAlgorithm() {
return "DESede";
}
public String getFormat() {
return "RAW";
}
/**
* Calculates a hash code value for the object.
* Objects that are equal will also have the same hashcode.
*/
public int hashCode() {
int retval = 0;
for (int i = 1; i < this.key.length; i++) {
retval += this.key[i] * i;
}
return(retval ^= "desede".hashCode());
}
public boolean equals(Object obj) {
if (this == obj)
return true;
if (!(obj instanceof SecretKey))
return false;
String thatAlg = ((SecretKey)obj).getAlgorithm();
if (!(thatAlg.equalsIgnoreCase("DESede"))
&& !(thatAlg.equalsIgnoreCase("TripleDES")))
return false;
byte[] thatKey = ((SecretKey)obj).getEncoded();
boolean ret = java.util.Arrays.equals(this.key, thatKey);
java.util.Arrays.fill(thatKey, (byte)0x00);
return ret;
}
/**
* readObject is called to restore the state of this key from
* a stream.
*/
private void readObject(java.io.ObjectInputStream s)
throws java.io.IOException, ClassNotFoundException
{
s.defaultReadObject();
key = (byte[])key.clone();
}
/**
* Replace the DESede key to be serialized.
*
* @return the standard KeyRep object to be serialized
*
* @throws java.io.ObjectStreamException if a new object representing
* this DESede key could not be created
*/
private Object writeReplace() throws java.io.ObjectStreamException {
return new KeyRep(KeyRep.Type.SECRET,
getAlgorithm(),
getFormat(),
getEncoded());
}
/**
* Ensures that the bytes of this key are
* set to zero when there are no more references to it.
*/
protected void finalize() throws Throwable {
try {
if (this.key != null) {
java.util.Arrays.fill(this.key, (byte)0x00);
this.key = null;
}
} finally {
super.finalize();
}
}
}