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// jTDS JDBC Driver for Microsoft SQL Server and Sybase
// Copyright (C) 2004 The jTDS Project
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package net.sourceforge.jtds.util;
import java.security.GeneralSecurityException;
import java.security.spec.KeySpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
/**
* a class that provides a basic DES engine.
* Modified by Matt Brinkley (mdb) ... mainly just removed depends on external classes.
*
* @author Matt Brinkley
* @version $Id: DESEngine.java,v 1.3.6.1 2009-08-04 10:33:54 ickzon Exp $
*/
public class DESEngine
{
protected static final int BLOCK_SIZE = 8;
private Cipher cf;
/**
* standard constructor.
*/
public DESEngine() {
// nothing
}
/**
* mdb: convenient constructor
*/
public DESEngine( boolean encrypting, byte[] key ) {
init(encrypting, key);
}
/**
* initialise a DES cipher.
*
* @param encrypting whether or not we are for encryption.
* @param key the parameters required to set up the cipher.
* @exception IllegalArgumentException if the params argument is
* inappropriate.
*/
public void init(boolean encrypting, byte[] key) {
try {
KeySpec ks;
SecretKeyFactory kf;
SecretKey ky;
ks = new DESKeySpec(key);
kf = SecretKeyFactory.getInstance("DES");
ky = kf.generateSecret(ks);
cf = Cipher.getInstance("DES/ECB/NoPadding");
cf.init(
(encrypting ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE),
ky);
} catch (GeneralSecurityException e) {
throw new RuntimeException("Error initializing DESEngine", e);
}
}
public String getAlgorithmName() {
return "DES";
}
public int getBlockSize() {
return BLOCK_SIZE;
}
public int processBlock(byte[] in, int inOff, byte[] out, int outOff) {
// rsc: keep the error behaviour as it was with the previous non-JDK implementation:
if (cf==null)
{
throw new IllegalStateException("DES engine not initialised");
}
if ((inOff + BLOCK_SIZE) > in.length)
{
//mdb: used to be DataLengthException
throw new IllegalArgumentException("input buffer too short");
}
if ((outOff + BLOCK_SIZE) > out.length)
{
//mdb: used to be DataLengthException
throw new IllegalArgumentException("output buffer too short");
}
try {
int len = cf.doFinal(in, inOff, 8, out, outOff);
return len;
} catch (GeneralSecurityException e) {
throw new RuntimeException("Error processing data block in DESEngine", e);
}
}
public void reset() {
// nothing
}
}
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