java安全2

Java代码
package com.ngsn.security;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;

/**
* 对称加密（加密解密的密钥一样）
* @author John.Yao
*
*/
public class SecretKeyTest1 {

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

        SecretDecrypt();

    }
    /**
     * 加密方法
     * 将加密的密钥保存在zxx_secret.key文件中
     * 将加密的数据保存在zxx.data文件中
     * @throws Exception
     */
    private static void SecretEncrypt() throws Exception{
        //Cipher 此类为加密和解密提供密码功能
        Cipher cipher = Cipher.getInstance("AES");
        //根据AES的加密方法生成一个密钥
        SecretKey key = KeyGenerator.getInstance("AES").generateKey();

        FileOutputStream fosKey = new FileOutputStream("zxx_secret.key");
        ObjectOutputStream oosSecretKey = new ObjectOutputStream(fosKey);
        //将密钥保存到zxx_secret.key文件中
        oosSecretKey.writeObject(key);
        oosSecretKey.close();
        fosKey.close();


        //初始化
        //Cipher.ENCRYPT_MODE 为加密模式
        //key 为加密的密钥
        cipher.init(Cipher.ENCRYPT_MODE,key);
        //对byte[] 进行加密，返回一个加密后的byte[]
        byte[] result = cipher.doFinal("abc".getBytes());
        System.out.println("result----->"+new String(result));

        FileOutputStream fosData = new FileOutputStream("zxx.data");
        fosData.write(result);
        fosData.close();
    }
    /**
     * 解密方法
     * @throws Exception
     */
    private static void SecretDecrypt()throws Exception{
        //Cipher 此类为加密和解密提供密码功能
        Cipher cipher = Cipher.getInstance("AES");
        //从zxx_secret.key文件中得到key
        FileInputStream fisKey = new FileInputStream("zxx_secret.key");
        ObjectInputStream ois = new ObjectInputStream(fisKey);
        Key key = (Key)ois.readObject();
        ois.close();
        fisKey.close();
        //解密
        //初始化
        cipher.init(Cipher.DECRYPT_MODE, key);
        //从zxx.data文件中得到加密的数据
        FileInputStream fis = new FileInputStream("zxx.data");
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while((len = fis.read(buffer)) != -1){
            bos.write(buffer, 0, len);
        }
        //从输出流中得到byte[]的加密数据
        byte[] result = bos.toByteArray();
        fis.close();
        bos.close();
        //对加密的数据进行解密
        byte[] b = cipher.doFinal(result);
        System.out.println("b------>"+new String(b));


    }
}

作者“mutourenoo”

补充：综合编程 , 安全编程 ,