com.cloudsoft.utils/src/com/cloudsoft/utils/EncryptedProperties.java

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package com.cloudsoft.utils;

import java.util.Properties;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEParameterSpec;

/**
 *
 * @author Paul
 */
public class EncryptedProperties extends Properties {

    private Cipher encrypter, decrypter;
    private static byte[] salt = {(byte) 0x00, 0x04, 0x00, 0x07, 0x01, 0x09, 0x06, 0x07};  // make up your own

    public EncryptedProperties() {
        this(salt);
    }
    public EncryptedProperties(byte[] bSalt) {
        try {
        String pw = "";
        int is = 80;
        while (pw.length() < 20) {
            is = is + pw.length() * ((pw.length()%2 == 1) ? -1:1);
            pw += (char) is;
        }
        PBEParameterSpec ps = new javax.crypto.spec.PBEParameterSpec(bSalt, 20);
        SecretKeyFactory kf = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        SecretKey k = kf.generateSecret(new javax.crypto.spec.PBEKeySpec(pw.toCharArray()));
        encrypter = Cipher.getInstance("PBEWithMD5AndDES/CBC/PKCS5Padding");
        decrypter = Cipher.getInstance("PBEWithMD5AndDES/CBC/PKCS5Padding");
        encrypter.init(Cipher.ENCRYPT_MODE, k, ps);
        decrypter.init(Cipher.DECRYPT_MODE, k, ps);
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
        }
    }

    public String getProperty(String key) {
        try {
            return decrypt(super.getProperty(key));
        } catch (Exception e) {
            throw new RuntimeException("Couldn't decrypt property");
        }
    }

    public synchronized Object setProperty(String key, String value) {
        return setProperty(key, value, true);
    }
    public synchronized Object setProperty(String key, String value, boolean bEncrypt) {
        try {
            return super.setProperty(key, bEncrypt ? encrypt(value) : value);
        } catch (Exception e) {
            throw new RuntimeException("Couldn't encrypt property");
        }
    }
    public synchronized Object setNormalProperty(String key, String value) {
        try {
            return super.setProperty(key, value);
        } catch (Exception e) {
            throw new RuntimeException("Couldn't encrypt property");
        }
    }

    private synchronized String decrypt(String str) throws Exception {
        byte[] dec = Base64.decode(str);
        byte[] utf8 = decrypter.doFinal(dec);
        return new String(utf8, "UTF-8");
    }

    private synchronized String encrypt(String str) throws Exception {
        byte[] utf8 = str.getBytes("UTF-8");
        byte[] enc = encrypter.doFinal(utf8);
        return Base64.encode(enc);
    }
}