DES加密

男娘i 2022-02-14 21:15 231阅读 0赞

DES算法为密码体制中的对称密码体制，又被称为美国数据加密标准。DES是一个分组加密算法，典型的DES以64位为分组对数据加密，加密和解密用的是同一个算法。

public class DES {
    
        public static 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);
                //获取数据并加密
                return cipher.doFinal(datasource);
            }catch(Throwable e){
                e.printStackTrace();
            }
            return null;
        }
    
        public static 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);
            //开始解密
            return cipher.doFinal(src);
        }
    
        public static void main(String[] args) throws Exception {
            byte[] result = desCrypto("测试内容".getBytes(),"asassdsdsfdfd");
            System.out.println("加密后内容为："+new String(result));
            byte[] decryResult = decrypt(result, "asassdsdsfdfd");
            System.out.println("解密后内容为："+new String(decryResult));
        }