com.adito.security.pki.SshKeyPairFactory.java Source code

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Here is the source code for com.adito.security.pki.SshKeyPairFactory.java

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/*
*  Adito
*
*  Copyright (C) 2003-2006 3SP LTD. All Rights Reserved
*
*  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.
*/

package com.adito.security.pki;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.maverick.util.ByteArrayReader;
import com.adito.security.pki.dsa.SshDssKeyPair;
import com.adito.security.pki.rsa.SshRsaKeyPair;

/**
 *
 *
 * @author $author$
 */
public class SshKeyPairFactory {
    private static Map pks;
    private static String defaultAlgorithm;
    private static Log log = LogFactory.getLog(SshKeyPairFactory.class);

    static {
        pks = new HashMap();
        if (log.isInfoEnabled())
            log.info("Loading public key algorithms");

        pks.put("ssh-rsa", SshRsaKeyPair.class);
        pks.put("ssh-dss", SshDssKeyPair.class);

        if ((defaultAlgorithm == null) || !pks.containsKey(defaultAlgorithm)) {
            Iterator it = pks.keySet().iterator();
            defaultAlgorithm = (String) it.next();
        }
    }

    /**
     * Creates a new SshKeyPairFactory object.
     */
    protected SshKeyPairFactory() {
    }

    /**
     *
     */
    public static void initialize() {
    }

    /**
     *
     *
     * @return
     */
    public static String getDefaultPublicKey() {
        return defaultAlgorithm;
    }

    /**
     *
     *
     * @return
     */
    public static List getSupportedKeys() {
        // Get the list of pks
        return new ArrayList(pks.keySet());
    }

    /**
     *
     *
     * @param methodName
     *
     * @return SshKeyPair
     *
     */
    public static SshKeyPair newInstance(String methodName) {
        try {
            return (SshKeyPair) ((Class) pks.get(methodName)).newInstance();
        } catch (Exception e) {
            return null;
        }
    }

    /**
     *
     *
     * @param algorithm
     *
     * @return
     */
    public static boolean supportsKey(String algorithm) {
        return pks.containsKey(algorithm);
    }

    /**
     *
     *
     * @param encoded
     *
     * @return SshPrivateKey
     *
     * @throws InvalidKeyException
     */
    public static SshPrivateKey decodePrivateKey(byte[] encoded) throws InvalidKeyException {
        try {
            ByteArrayReader bar = new ByteArrayReader(encoded);
            String algorithm = bar.readString();

            if (supportsKey(algorithm)) {
                SshKeyPair pair = newInstance(algorithm);

                return pair.decodePrivateKey(encoded);
            } else {
                return null;
            }
        } catch (IOException ioe) {
            return null;
        }
    }

    public static SshPrivateKey decodePrivateKey(InputStream in) throws InvalidKeyException, IOException {

        ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] buf = new byte[4096];
        int read;

        while ((read = in.read(buf)) > -1) {
            out.write(buf, 0, read);
        }

        return decodePrivateKey(out.toByteArray());

    }

    /**
     *
     *
     * @param encoded
     *
     * @return SshPublicKey
     *
     * @throws InvalidKeyException
     */
    public static SshPublicKey decodePublicKey(byte[] encoded) throws InvalidKeyException {
        try {
            ByteArrayReader bar = new ByteArrayReader(encoded);
            String algorithm = bar.readString();

            if (supportsKey(algorithm)) {
                SshKeyPair pair = newInstance(algorithm);

                return pair.decodePublicKey(encoded);
            } else {
                return null;
            }
        } catch (IOException ioe) {
            return null;
        }
    }

    public static SshPublicKey decodePublicKey(InputStream in) throws InvalidKeyException, IOException {

        ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] buf = new byte[4096];
        int read;

        while ((read = in.read(buf)) > -1) {
            out.write(buf, 0, read);
        }

        return decodePublicKey(out.toByteArray());

    }
}