使用CipherOutputStream : 密码流 « 安全


import java.io.FileOutputStream;

import java.io.ObjectOutputStream;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.security.SecureRandom;



import javax.crypto.Cipher;

import javax.crypto.CipherOutputStream;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;



public class MainClass {

  public static void main(String args[]) throws Exception {

    KeyGenerator kg = KeyGenerator.getInstance("DES");

    kg.init(new SecureRandom());

    SecretKey key = kg.generateKey();

    SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");

    Class spec = Class.forName("javax.crypto.spec.DESKeySpec");

    DESKeySpec ks = (DESKeySpec) skf.getKeySpec(key, spec);

    ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("keyfile"));

    oos.writeObject(ks.getKey());



    Cipher c = Cipher.getInstance("DES/CFB8/NoPadding");

    c.init(Cipher.ENCRYPT_MODE, key);

    CipherOutputStream cos = new CipherOutputStream(new FileOutputStream("ciphertext"), c);

    PrintWriter pw = new PrintWriter(new OutputStreamWriter(cos));

    pw.println("Stand and unfold yourself");

    pw.close();

    oos.writeObject(c.getIV());

    oos.close();

  }

}
使用CipherOutputStream : 密码流 « 安全 « Java 教程
