/*
* SSHTools - Java SSH2 API
*
* Copyright (C) 2002-2003 Lee David Painter and Contributors.
*
* Contributions made by:
*
* Brett Smith
* Richard Pernavas
* Erwin Bolwidt
*
* This program 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
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package com.sshtools.j2ssh.transport.cipher;
import com.sshtools.j2ssh.transport.AlgorithmOperationException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.Cipher;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
/**
*
*
* @author $author$
* @version $Revision: 1.21 $
*/
public class BlowfishCbc extends SshCipher {
private static Log log = LogFactory.getLog(BlowfishCbc.class);
/** */
protected static String algorithmName = "blowfish-cbc";
Cipher cipher;
/**
* Creates a new BlowfishCbc object.
*/
public BlowfishCbc() {
}
/**
*
*
* @return
*/
public int getBlockSize() {
return cipher.getBlockSize();
}
/**
*
*
* @param mode
* @param iv
* @param keydata
*
* @throws AlgorithmOperationException
*/
public void init(int mode, byte[] iv, byte[] keydata)
throws AlgorithmOperationException {
try {
cipher = Cipher.getInstance("Blowfish/CBC/NoPadding");
// Create a 16 byte key
byte[] actualKey = new byte[16];
System.arraycopy(keydata, 0, actualKey, 0, actualKey.length);
SecretKeySpec keyspec = new SecretKeySpec(actualKey, "Blowfish");
// Create the cipher according to its algorithm
cipher.init(((mode == ENCRYPT_MODE) ? Cipher.ENCRYPT_MODE
: Cipher.DECRYPT_MODE),
keyspec, new IvParameterSpec(iv, 0, cipher.getBlockSize()));
} catch (NoSuchPaddingException nspe) {
log.error("Blowfish initialization failed", nspe);
throw new AlgorithmOperationException("No Padding not supported");
} catch (NoSuchAlgorithmException nsae) {
log.error("Blowfish initialization failed", nsae);
throw new AlgorithmOperationException("Algorithm not supported");
} catch (InvalidKeyException ike) {
log.error("Blowfish initialization failed", ike);
throw new AlgorithmOperationException("Invalid encryption key");
/*} catch (InvalidKeySpecException ispe) {
throw new AlgorithmOperationException("Invalid encryption key specification");*/
} catch (InvalidAlgorithmParameterException ape) {
log.error("Blowfish initialization failed", ape);
throw new AlgorithmOperationException("Invalid algorithm parameter");
}
}
/**
*
*
* @param data
* @param offset
* @param len
*
* @return
*
* @throws AlgorithmOperationException
*/
public byte[] transform(byte[] data, int offset, int len)
throws AlgorithmOperationException {
return cipher.update(data, offset, len);
}
}