DES是一种对称加密算法,所谓对称加密算法即:加密和解密使用相同密钥的算法
/**
注意:DES加密和解密过程中,密钥长度都必须是8的倍数 */ public class DES { public DES() { } //测试 public static void main(String args[]) { //待加密内容 String str = "测试内容"; //密码,长度要是8的倍数 String password = "9588028820109132"; byte[] result = DES.encrypt(str.getBytes(),password); System.out.println("加密后:"+new String(result)); //直接将如上内容解密 try { byte[] decryResult = DES.decrypt(result, password); System.out.println("解密后:"+new String(decryResult)); } catch (Exception e1) { e1.printStackTrace(); } } /** * 加密 * @param datasource byte[] * @param password String * @return byte[] */ public static byte[] encrypt(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; } /** * 解密 * @param src byte[] * @param password String * @return byte[] * @throws Exception */ 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); // 真正开始解密操作 return cipher.doFinal(src); } }