org.silvertunnel.netlib.layer.tor.util.PrivateKeyHandler.java Source code

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Here is the source code for org.silvertunnel.netlib.layer.tor.util.PrivateKeyHandler.java

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/**
 * OnionCoffee - Anonymous Communication through TOR Network
 * Copyright (C) 2005-2007 RWTH Aachen University, Informatik IV
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 * 
 * 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 org.silvertunnel.netlib.layer.tor.util;

import java.math.BigInteger;
import java.net.Socket;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.Principal;
import java.security.PrivateKey;
import java.security.SecureRandom;
import java.util.Date;
import java.util.logging.Logger;

import javax.net.ssl.X509KeyManager;

/**
 * manages private keys for:
 * <ul>
 * <li>identity
 * <li>onion routing
 * <li>hidden services
 * </ul>
 * 
 * @author Lexi Pimenidis
 */
public class PrivateKeyHandler implements X509KeyManager {
    private static final Logger log = Logger.getLogger(PrivateKeyHandler.class.getName());

    private KeyPair keypair;

    /**
     * generates a new random key pair on every start
     */
    public PrivateKeyHandler() {
        try {
            KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "BC");
            generator.initialize(1024, new SecureRandom());
            keypair = generator.generateKeyPair();
        } catch (Exception e) {
            log.severe("PrivateKeyHandler: Caught exception: " + e.getMessage());
        }
    }

    public KeyPair getIdentity() {
        return keypair;
    }

    public String chooseClientAlias(String[] keyType, Principal[] issuers, Socket socket) {
        return Util.MYNAME;
    }

    public PrivateKey getPrivateKey(String alias) {
        return keypair.getPrivate();
    }

    public String[] getClientAliases(String keyType, Principal[] issuers) {
        String[] s = new String[1];
        s[0] = "TorJava";
        return s;
    }

    public java.security.cert.X509Certificate[] getCertificateChain(String alias) {
        try {
            org.bouncycastle.x509.X509V3CertificateGenerator generator = new org.bouncycastle.x509.X509V3CertificateGenerator();
            generator.reset();
            generator.setSerialNumber(BigInteger.valueOf(42));
            generator.setNotBefore(new Date(System.currentTimeMillis() - 24L * 3600 * 1000));
            generator.setNotAfter(new Date(System.currentTimeMillis() + 365L * 24 * 3600 * 1000));
            generator.setIssuerDN(new org.bouncycastle.asn1.x509.X509Name("CN=" + Util.MYNAME));
            generator.setSubjectDN(new org.bouncycastle.asn1.x509.X509Name("CN=" + Util.MYNAME));
            generator.setPublicKey(keypair.getPublic());
            generator.setSignatureAlgorithm("SHA1WITHRSA");
            java.security.cert.X509Certificate x509 = generator.generate(keypair.getPrivate(), "BC");
            java.security.cert.X509Certificate[] x509s = new java.security.cert.X509Certificate[2];

            // send the same certificate twice works fine with the default implementation of tor!
            //   myself:
            x509s[0] = x509;
            //   a certificate for myself:
            x509s[1] = x509;

            return x509s;
        } catch (Exception e) {
            log.severe("Caught exception: " + e.getMessage());
        }
        return null;
    }

    public String chooseServerAlias(String keyType, Principal[] issuers, Socket socket) {
        return null;
    }

    public String[] getServerAliases(String keyType, Principal[] issuers) {
        return null;
    }
}