Java服务端和Android客户端通讯对消息体加密和解密的工具类，主要依赖包：commons-codec-1.8.jar

importjava.security.SecureRandom;

 

importjavax.crypto.Cipher;

importjavax.crypto.SecretKey;

importjavax.crypto.SecretKeyFactory;

importjavax.crypto.spec.DESKeySpec;

 

importorg.apache.commons.codec.binary.Base64;

importorg.apache.commons.codec.binary.StringUtils;

 

/**

 * 客户端与服务器通讯时对消息体加密和解密的工具类

 * @author LIUTAO

 *

 */

publicclass DESBase64Util {

 

    /**

     * 密码长度必须是8的倍数

     */

    publicfinal static String KEY = "RS35836780805258";

 

    /**

     * 加密方式

     */

    publicfinal static String DES = "DES";

 

    /**

     * 默认编码

     */

    publicfinal static String ENCODING = "UTF-8";

 

    /**

     * DES加密

     *

     * @param src

     * @param key

     * @return

     * @throws Exception

     */

    publicstatic byte[] encrypt(byte[] src, byte[] key) throwsException {

        // DES算法要求有一个可信任的随机数源

        SecureRandom sr = newSecureRandom();

        // 从原始密匙数据创建DESKeySpec对象

        DESKeySpec dks = newDESKeySpec(key);

        // 创建一个密匙工厂，然后用它把DESKeySpec转换成一个SecretKey对象

        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);

        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成加密操作

        Cipher cipher = Cipher.getInstance(DES);

        // 用密匙初始化Cipher对象

        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

        // 现在，获取数据并加密

        // 正式执行加密操作

        returncipher.doFinal(src);

    }

 

    /**

     * DES解密

     *

     * @param src

     * @param key

     * @return

     * @throws Exception

     */

    publicstatic byte[] decrypt(byte[] src, byte[] key) throwsException {

        // DES算法要求有一个可信任的随机数源

        SecureRandom sr = newSecureRandom();

        // 从原始密匙数据创建一个DESKeySpec对象

        DESKeySpec dks = newDESKeySpec(key);

        // 创建一个密匙工厂，然后用它把DESKeySpec对象转换成

        // 一个SecretKey对象

        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);

        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成解密操作

        Cipher cipher = Cipher.getInstance(DES);

        // 用密匙初始化Cipher对象

        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

        // 现在，获取数据并解密

        // 正式执行解密操作

        returncipher.doFinal(src);

    }

 

    /**

     * BASE64编码

     *

     * @param info

     * @return

     */

    publicstatic String base64Encode(byte[] info) {

        returnBase64.encodeBase64String(info);

    }

 

    /**

     * BASE64解码

     *   *

     * @param info

     * @return

     */

    publicstatic byte[] base64Decode(String info) {

        returnBase64.decodeBase64(info);

    }

 

    /**

     * 先对消息体进行DES编码再进行BASE64编码

     * @param info

     * @return

     */

    publicstatic String encodeInfo(String info) {

        try{

            byte[] temp = encrypt(info.getBytes(ENCODING),

                    KEY.getBytes(ENCODING));

            returnbase64Encode(temp);

        }catch(Exception e) {

            e.printStackTrace();

        }

        return"";

    }

    /**

     * 先对消息体进行BASE64解码再进行DES解码

     * @param info

     * @return

     */

    publicstatic String decodeInfo(String info) {

        byte[] temp = base64Decode(info);

        try{

            byte[] buf = decrypt(temp,

                    KEY.getBytes(ENCODING));

            returnStringUtils.newStringUtf8(buf);

        }catch(Exception e) {

            e.printStackTrace();

        }

        return"";

    }

 

    publicstatic void main(String[] args) {

        String info = "我是中国人，我爱祖国这是测试数据无所设置无所设置";

        //生成密文

        String encodeInfo = encodeInfo(info);      

        System.out.println(encodeInfo);

        //还原成原文

        String decodeInfo = decodeInfo(encodeInfo);

        System.out.println(decodeInfo);

    }

}