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/*
* This file is part of "JTA - Telnet/SSH for the JAVA(tm) platform".
*
* (c) Matthias L. Jugel, Marcus Meißner 1996-2005. All Rights Reserved.
*
* Please visit http://javatelnet.org/ for updates and contact.
*
* --LICENSE NOTICE--
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
* --LICENSE NOTICE--
*
*/
package de.mud.ssh;
/**
* Cipher class is the type for all other ciphers.
* @author Marcus Meissner
* @version $Id: Cipher.java 499 2005-09-29 08:24:54Z leo $
*/
public abstract class Cipher {
public static Cipher getInstance(String algorithm) {
Class c;
try {
c = Class.forName("de.mud.ssh." + algorithm);
return (Cipher) c.newInstance();
} catch (Throwable t) {
System.err.println("Cipher: unable to load instance of '" + algorithm + "'");
return null;
}
}
/**
* Encrypt source byte array using the instantiated algorithm.
*/
public byte[] encrypt(byte[] src) {
byte[] dest = new byte[src.length];
encrypt(src, 0, dest, 0, src.length);
return dest;
}
/**
* The actual encryption takes place here.
*/
public abstract void encrypt(byte[] src, int srcOff, byte[] dest, int destOff, int len);
/**
* Decrypt source byte array using the instantiated algorithm.
*/
public byte[] decrypt(byte[] src) {
byte[] dest = new byte[src.length];
decrypt(src, 0, dest, 0, src.length);
return dest;
}
/**
* The actual decryption takes place here.
*/
public abstract void decrypt(byte[] src, int srcOff, byte[] dest, int destOff, int len);
public abstract void setKey(byte[] key);
public void setKey(String key) {
setKey(key.getBytes());
}
}
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