/*
* 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.configuration.ConfigurationException;
import com.sshtools.j2ssh.configuration.ConfigurationLoader;
import com.sshtools.j2ssh.io.IOUtil;
import com.sshtools.j2ssh.transport.AlgorithmNotSupportedException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Vector;
/**
*
*
* @author $author$
* @version $Revision: 1.32 $
*/
public class SshCipherFactory {
private static HashMap ciphers;
private static String defaultCipher;
private static Log log = LogFactory.getLog(SshCipherFactory.class);
private static ArrayList supported;
static {
ciphers = new HashMap();
log.info("Loading supported cipher algorithms");
ciphers.put("3des-cbc", TripleDesCbc.class);
ciphers.put("blowfish-cbc", BlowfishCbc.class);
defaultCipher = "blowfish-cbc";
try {
Enumeration en = ConfigurationLoader.getExtensionClassLoader()
.getResources("j2ssh.cipher");
URL url;
Properties properties = new Properties();
InputStream in;
while ((en != null) && en.hasMoreElements()) {
url = (URL) en.nextElement();
in = url.openStream();
properties.load(in);
IOUtil.closeStream(in);
int num = 1;
String name = "";
Class cls;
while (properties.getProperty("cipher.name." +
String.valueOf(num)) != null) {
try {
name = properties.getProperty("cipher.name." +
String.valueOf(num));
cls = ConfigurationLoader.getExtensionClassLoader()
.loadClass(properties.getProperty(
"cipher.class." + String.valueOf(num)));
cls.newInstance();
ciphers.put(name, cls);
log.info("Installed " + name + " cipher");
} catch (Throwable ex) {
log.info("Could not install cipher class for " + name,
ex);
}
num++;
}
}
} catch (Throwable t) {
}
// Build a list of the supported ciphers
supported = new ArrayList(ciphers.keySet());
}
/**
* Creates a new SshCipherFactory object.
*/
protected SshCipherFactory() {
}
/**
*
*/
public static void initialize() {
}
/**
*
*
* @return
*/
public static String getDefaultCipher() {
return defaultCipher;
}
/**
*
*
* @return
*/
public static List getSupportedCiphers() {
// Return the list
return supported;
}
/**
*
*
* @param algorithmName
*
* @return
*
* @throws AlgorithmNotSupportedException
*/
public static SshCipher newInstance(String algorithmName)
throws AlgorithmNotSupportedException {
log.info("Creating new " + algorithmName + " cipher instance");
try {
return (SshCipher) ((Class) ciphers.get(algorithmName)).newInstance();
} catch (Throwable t) {
throw new AlgorithmNotSupportedException(algorithmName +
" is not supported!");
}
}
}