Spring属性ファイルの暗号解読応用

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.Key;
import java.util.Properties;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import org.springframework.core.io.Resource;
import org.springframework.util.DefaultPropertiesPersister;
import org.springframework.util.PropertiesPersister;
public class DecryptPropertyPlaceholderConfigurer
        extends PropertyPlaceholderConfigurer ...{
    private Resource[] locations;   //①               
    private Resource keyLocation; //②         
    public void setKeyLocation(Resource keyLocation) ...{
        this.keyLocation = keyLocation;
    }
    public void setLocations(Resource[] locations) ...{
        this.locations = locations;
    }
    public void loadProperties(Properties props) throws IOException ...{
        if (this.locations != null) ...{
            PropertiesPersister propertiesPersister = new DefaultPropertiesPersister();
            for (int i = 0; i < this.locations.length; i++) ...{
                Resource location = this.locations[i];
                if (logger.isInfoEnabled()) ...{
                    logger.info("Loading properties file from " + location);
                }
                InputStream is = null;
                try{
                    is = location.getInputStream();
                        //③     
                    Key key = DESEncryptUtil.getKey(keyLocation.getInputStream());
                    //④          
                    is = DESEncryptUtil.doDecrypt(key, is);
                    //⑤            props 
                    if(fileEncoding != null)...{
                        propertiesPersister.load(props,new InputStreamReader(is,fileEncoding));
                    }else {
                        propertiesPersister.load(props ,is);
                    }
                } finally{
                    if (is != null)
                        is.close();
                }
            }
        }
    }
    }
}

public class DESEncryptUtil ...{
    public static Key createKey() throws NoSuchAlgorithmException {//      
        Security.insertProviderAt(new com.sun.crypto.provider.SunJCE(), 1);
        KeyGenerator generator = KeyGenerator.getInstance("DES");
        generator.init(new SecureRandom());
        Key key = generator.generateKey();
        return key;
    }
    public static Key getKey(InputStream is) {
        try{
            ObjectInputStream ois = new ObjectInputStream(is);
            return (Key) ois.readObject();
        } catch (Exception e) ...{
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }
    private static byte[] doEncrypt(Key key, byte[] data) {//       
        try {
            Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, key);
            byte[] raw = cipher.doFinal(data);
            return raw;
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }
    public static InputStream doDecrypt(Key key, InputStream in) {//       
        try {
            Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, key);
            ByteArrayOutputStream bout = new ByteArrayOutputStream();
            byte[] tmpbuf = new byte[1024];
            int count = 0;
            while ((count = in.read(tmpbuf)) != -1) {
                bout.write(tmpbuf, 0, count);
                tmpbuf = new byte[1024];
            }
            in.close();
            byte[] orgData = bout.toByteArray();
            byte[] raw = cipher.doFinal(orgData);
            ByteArrayInputStream bin = new ByteArrayInputStream(raw);
            return bin;
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        }
    }
    public static void main(String[] args) throws Exception {//   Java          
        if (args.length == 2 && args[0].equals("key")) {//       
            Key key = DESEncryptUtil.createKey();
            ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(args[1]));
            oos.writeObject(key);
            oos.close();
            System.out.println("        。");
        } else if (args.length == 3 && args[0].equals("encrypt")) {//       
            File file = new File(args[1]);
            FileInputStream in = new FileInputStream(file);
            ByteArrayOutputStream bout = new ByteArrayOutputStream();
            byte[] tmpbuf = new byte[1024];
            int count = 0;
            while ((count = in.read(tmpbuf)) != -1) {
                bout.write(tmpbuf, 0, count);
                tmpbuf = new byte[1024];
            }
            in.close();
            byte[] orgData = bout.toByteArray();
            Key key = getKey(new FileInputStream(args[2]));
            byte[] raw = DESEncryptUtil.doEncrypt(key, orgData);
            file = new File(file.getParent() + "\\en_" + file.getName());
            FileOutputStream out = new FileOutputStream(file);
            out.write(raw);
            out.close();
            System.out.println("    ，      :"+file.getAbsolutePath());
        } else if (args.length == 3 && args[0].equals("decrypt")) {//       
            File file = new File(args[1]);
            FileInputStream fis = new FileInputStream(file);
            Key key = getKey(new FileInputStream(args[2]));
            InputStream raw = DESEncryptUtil.doDecrypt(key, fis);
            ByteArrayOutputStream bout = new ByteArrayOutputStream();
            byte[] tmpbuf = new byte[1024];
            int count = 0;
            while ((count = raw.read(tmpbuf)) != -1) {
                bout.write(tmpbuf, 0, count);
                tmpbuf = new byte[1024];
            }
            raw.close();
            byte[] orgData = bout.toByteArray();
            file = new File(file.getParent() + "\\rs_" + file.getName());
            FileOutputStream fos = new FileOutputStream(file);
            fos.write(orgData);
            System.out.println("    ，      :"+file.getAbsolutePath());
        }
    }
}  

<bean class="com.baobaotao.place.DecryptPropertyPlaceholderConfigurer"> ①
    <property name="locations">
        <list>
            <value>classpath:com/baobaotao/en_car.properties</value>
        </list>
    </property>
    <property name="keyLocation" value="classpath:com/baobaotao/key.dat" />
    <property name="fileEncoding" value="utf-8" />
</bean>
<bean id="car" class="com.baobaotao.place.Car"> ②
    <property name="brand" value="${brand}" />
    <property name="maxSpeed" value="${maxSpeed}" />
    <property name="price" value="${price}" />
</bean>