net.sf.jftp.config.Crypto.java Source code

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Here is the source code for net.sf.jftp.config.Crypto.java

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/*
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package net.sf.jftp.config;

import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

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

@SuppressWarnings("restriction")
public class Crypto {
    private static final char[] PASSWORD = "(l_[m^5][:]FQ8D* ;zoG,7".toCharArray();

    private static final byte[] SALT = { (byte) 0x56, (byte) 0x40, (byte) 0x77, (byte) 0x32, (byte) 0x10,
            (byte) 0x63, (byte) 0x25, (byte) 0x3C, };

    private static String base64Encode(byte[] bytes) {
        return new String(Base64.encodeBase64(bytes));
    }

    private static byte[] base64Decode(String str) throws IOException {
        return Base64.decodeBase64(str.getBytes());
    }

    public static String Encrypt(String str) {
        // create cryptography object
        SecretKeyFactory factory;
        try {
            factory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        } catch (NoSuchAlgorithmException e) {
            // We could try another algorithm, but it is highly unlikely that this would be the case
            return "";
        }

        // init key
        SecretKey key;

        try {
            key = factory.generateSecret(new PBEKeySpec(PASSWORD));
        } catch (InvalidKeySpecException e) {
            // The password is hard coded - this exception can't be the case
            return "";
        }

        // init cipher
        Cipher pbeCipher;
        try {
            pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
        } catch (NoSuchPaddingException e) {
            // We could try another algorithm, but it is highly unlikely that this would be the case
            return "";
        } catch (NoSuchAlgorithmException e) {
            // We could try another algorithm, but it is highly unlikely that this would be the case
            return "";
        }

        try {
            pbeCipher.init(Cipher.ENCRYPT_MODE, key, new PBEParameterSpec(SALT, 20));
        } catch (InvalidKeyException e) {
            return "";
        } catch (InvalidAlgorithmParameterException e) {
            return "";
        }

        // encode & return encoded string
        try {
            return base64Encode(pbeCipher.doFinal(str.getBytes()));
        } catch (IllegalBlockSizeException e) {
            return "";
        } catch (BadPaddingException e) {
            return "";
        }
    }

    public static String Decrypt(String str) {
        // create cryptography object
        SecretKeyFactory keyFactory;
        try {
            keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        } catch (NoSuchAlgorithmException e) {
            // We could try another algorithm, but it is highly unlikely that this would be the case
            return "";
        }

        // init key
        SecretKey key;
        try {
            key = keyFactory.generateSecret(new PBEKeySpec(PASSWORD));
        } catch (InvalidKeySpecException e) {
            return "";
        }

        // init cipher
        Cipher pbeCipher;
        try {
            pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
        } catch (NoSuchAlgorithmException e) {
            return "";
        } catch (NoSuchPaddingException e) {
            return "";
        }

        try {
            pbeCipher.init(Cipher.DECRYPT_MODE, key, new PBEParameterSpec(SALT, 20));
        } catch (InvalidKeyException e) {
            return "";
        } catch (InvalidAlgorithmParameterException e) {
            return "";
        }

        // decode & return decoded string
        String dec;

        try {
            dec = new String(pbeCipher.doFinal(base64Decode(str)));
        } catch (IllegalBlockSizeException e) {
            return "";
        } catch (BadPaddingException e) {
            return "";
        } catch (IOException e) {
            return "";
        }

        return dec;
    }

}