java实现DES加密

通常，在传输文件的时候，需要对传输内容进行加密。DES是一种比较简单的加密方式，能够满足一定条件下的数据安全需求。

public class DESTest {

static String DES = "DES";

public static void main(String[] args){
String strData = "woshihaoren";
String pwd = "98765432";
try {
byte[] st1 = encrypt(strData.getBytes(), pwd.getBytes());
System.out.println(new String(st1));

byte[] st2 = decrypt(st1, pwd.getBytes());

System.out.println(new String(st2));

} catch (Exception e) {

e.printStackTrace();
}
}

public static byte[] decrypt(byte[] data, byte[] key) 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(key);
// 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(data);
}

public static byte[] encrypt(byte[] data, byte[] key) throws Exception{

//生成一个随机数据源
SecureRandom random = new SecureRandom();

DESKeySpec ds = new DESKeySpec(key);

//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(ds);

//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(data);
}
}