org.craftercms.social.util.support.security.crypto.SimpleDesCipher.java Source code

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Here is the source code for org.craftercms.social.util.support.security.crypto.SimpleDesCipher.java

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/*
 * Copyright (C) 2007-2013 Crafter Software Corporation.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
package org.craftercms.social.util.support.security.crypto;

import java.security.InvalidKeyException;
import java.security.KeyException;
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.DESedeKeySpec;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SimpleDesCipher {

    private SecretKey skey;
    private Cipher cipher;
    private final transient Logger log = LoggerFactory.getLogger(SimpleDesCipher.class);

    public SimpleDesCipher(String base64Key) {
        try {
            cipher = Cipher.getInstance("DESede");
        } catch (NoSuchAlgorithmException e1) {
            log.error(e1.getMessage(), e1);
        } catch (NoSuchPaddingException e) {
            log.error(e.getMessage(), e);
        }

        byte[] raw = Base64.decodeBase64(base64Key);

        DESedeKeySpec keyspec;
        try {
            keyspec = new DESedeKeySpec(raw);

            SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("DESede");
            skey = keyfactory.generateSecret(keyspec);
        } catch (InvalidKeyException e) {
            log.error(e.getMessage(), e);
        } catch (NoSuchAlgorithmException e) {
            log.error(e.getMessage(), e);
        } catch (InvalidKeySpecException e) {
            log.error(e.getMessage(), e);
        }
    }

    public void setKey(byte[] key) throws KeyException, NoSuchAlgorithmException, InvalidKeySpecException {
        DESedeKeySpec keyspec;
        keyspec = new DESedeKeySpec(key);

        SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("DESede");
        skey = keyfactory.generateSecret(keyspec);
    }

    public byte[] encrypt(byte[] clear) throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        cipher.init(Cipher.ENCRYPT_MODE, skey);

        return cipher.doFinal(clear);
    }

    public byte[] decrypt(byte[] encrypted)
            throws InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        cipher.init(Cipher.DECRYPT_MODE, skey);

        return cipher.doFinal(encrypted);
    }

}