利用JAVA实现DES加密算法

        public byte[] desCrypto(byte[] datasource, String password) {           
                try{
                SecureRandom random = new SecureRandom();
                DESKeySpec desKey = new DESKeySpec(password.getBytes());
                //创建一个密匙工厂，然后用它把DESKeySpec转换成
                SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
                SecretKey securekey = keyFactory.generateSecret(desKey);
                //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, random);
                //现在，获取数据并加密
                //正式执行加密操作
                return cipher.doFinal(datasource);
                }catch(Throwable e){
                        e.printStackTrace();
                }
                return null;
        }

        private byte[] decrypt(byte[] src, String password) throws Exception {
                // DES算法要求有一个可信任的随机数源
                SecureRandom random = new SecureRandom();
                // 创建一个DESKeySpec对象
                DESKeySpec desKey = new DESKeySpec(password.getBytes());
                // 创建一个密匙工厂
                SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
                // 将DESKeySpec对象转换成SecretKey对象
                SecretKey securekey = keyFactory.generateSecret(desKey);
                // 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, random);
                // 真正开始解密操作
                return cipher.doFinal(src);
        }

                //待加密内容
                String str = "测试内容";
                //密码，长度要是8的倍数
                String password = "12345678";
                byte[] result = DESCrypto.desCrypto(str.getBytes(),password);
                System.out.println("加密后内容为："+new String(result));

                //直接将如上内容解密
                try {
                        byte[] decryResult = des.decrypt(result, password);
                        System.out.println("加密后内容为："+new String(decryResult));
                } catch (Exception e1) {
                        e1.printStackTrace();
                }