birch.util.EncryptionKeyFileUtil.java Source code

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Here is the source code for birch.util.EncryptionKeyFileUtil.java

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/*
 * EncryptionKeyFileUtil.java
 *
 * Copyright (C) 2009 Beselius
 *
 * This file is part of Birch.
 *
 * Birch 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 3 of the License, or
 * (at your option) any later version.
 *
 * Birch 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 Birch.  If not, see <http://www.gnu.org/licenses/>.
 */
package birch.util;

import java.util.logging.Level;
import java.util.logging.Logger;

import javax.crypto.*;

import java.security.*;

import org.apache.commons.codec.binary.Base64;

/**
 *
 * @author Beselius
 */
public class EncryptionKeyFileUtil {

    public static String createKey(String cipher, int keysize) throws InvalidKeyException,
            IllegalBlockSizeException, NoSuchAlgorithmException, NoSuchPaddingException {
        KeyGenerator keyGenerator;
        Key key;

        keyGenerator = KeyGenerator.getInstance(cipher);
        keyGenerator.init(keysize);
        key = keyGenerator.generateKey();

        return new String(Base64.encodeBase64(key.getEncoded()));
    }

    public static void main(String[] args) {
        try {

            String cipher = "AES";
            int keysize = 128;

            if (args.length > 0) {
                cipher = args[0];
            }
            if (args.length > 1) {
                keysize = Integer.parseInt(args[1]);
            }

            System.out.println("Cipher algorithm " + cipher + " used to create a " + keysize + "bit key:");
            System.out.println(createKey(cipher, keysize));

        } catch (Throwable ex) {
            Logger.getLogger(EncryptionKeyFileUtil.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}