TripleDESCrytor.java

/*
 * Copyright 2013 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.juddi.v3.client.cryptor;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.KeySpec;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import org.apache.commons.codec.binary.Base64;

/**
 * Triple DES, 168 bit key
 * @author <a href="mailto:alexoree@apache.org">Alex O'Ree</a>
 */
public class TripleDESCrytor implements Cryptor {

    private static final String UNICODE_FORMAT = "UTF8";
    private static final String DESEDE_ENCRYPTION_SCHEME = "DESede";
    private KeySpec ks;
    private SecretKeyFactory skf;
    private Cipher cipher;
    byte[] arrayBytes;
    private String myEncryptionKey;
    private String myEncryptionScheme;
    SecretKey key;
    
    /**
     *default constructor
     * @throws Exception
     */
    public TripleDESCrytor() throws Exception {
        String keyfromfile = CryptorFactory.loadKeyFromFile("TripleDESCrytor");
        if (keyfromfile!=null)
                    myEncryptionKey=keyfromfile;
        else
                myEncryptionKey = "rioTEBCe/RAHRs6tTyYxDqettnVbZA6z";
        myEncryptionScheme = DESEDE_ENCRYPTION_SCHEME;
        arrayBytes = myEncryptionKey.getBytes(UNICODE_FORMAT);
        ks = new DESedeKeySpec(arrayBytes);
        skf = SecretKeyFactory.getInstance(myEncryptionScheme);
        cipher = Cipher.getInstance(myEncryptionScheme);
        key = skf.generateSecret(ks);
    }

    @Override
    public String encrypt(String clear) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        String encryptedString = null;
        try {
            cipher.init(Cipher.ENCRYPT_MODE, key);
            byte[] plainText = clear.getBytes(UNICODE_FORMAT);
            byte[] encryptedText = cipher.doFinal(plainText);
            encryptedString = new String(Base64.encodeBase64(encryptedText), UNICODE_FORMAT);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return encryptedString;
    }

    /**
     * generates a new key
     * @return a new key
     */
    public static String GEN() {
        KeyGenerator kgen;
        try {
            kgen = KeyGenerator.getInstance(DESEDE_ENCRYPTION_SCHEME);
            kgen.init(168);
            SecretKey skey = kgen.generateKey();
            byte[] raw = skey.getEncoded();
            return new String(Base64.encodeBase64(raw),UNICODE_FORMAT);
        } catch (Exception ex) {
            ex.printStackTrace();;
        }
        return null;
    }

    @Override
    public String decrypt(String str) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
        String encryptedString = str;
        try {
            cipher.init(Cipher.DECRYPT_MODE, key);
            byte[] encryptedText = Base64.decodeBase64(str.getBytes(UNICODE_FORMAT));
            byte[] plainTest = cipher.doFinal(encryptedText);
            encryptedString = new String(plainTest, UNICODE_FORMAT);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return encryptedString;
    }

        @Override
        public String newKey() {
                return GEN();
        }
}