JAVA对称加密算法PBE定义与用法实例分析

2021-04-02 我要评论

本文实例讲述了JAVA对称加密算法PBE定义与用法。分享给大家供大家参考，具体如下：

一 AES、DES和3DES在使用上比较一致

二 PBE算法优点

三 PBE介绍

1、PBE：Password Based Encryption 基于口令加密。通过加Salt来增强安全性。
2、对已有算法的包装
3、JDK和BC的实现
4、通过加Salt来增强安全性

四常见算法

五代码实现

package com.imooc.security.pbe;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;
import org.apache.commons.codec.binary.Base64;
public class ImoocPBE {
    private static String src = "cakin24 security pbe";
    public static void main(String[] args) {
        jdkPBE();
    }
    public static void jdkPBE() {
        try {
            //初始化盐
            SecureRandom random = new SecureRandom();
            byte[] salt = random.generateSeed(8);
            //口令与密钥
            String password = "cakin24";
            PBEKeySpec pbeKeySpec = new PBEKeySpec(password.toCharArray());
            SecretKeyFactory factory = SecretKeyFactory.getInstance("PBEWITHMD5andDES");
            Key key = factory.generateSecret(pbeKeySpec);
            //加密
            PBEParameterSpec pbeParameterSpec = new PBEParameterSpec(salt, 100);
            Cipher cipher = Cipher.getInstance("PBEWITHMD5andDES");
            cipher.init(Cipher.ENCRYPT_MODE, key, pbeParameterSpec);
            byte[] result = cipher.doFinal(src.getBytes());
            System.out.println("jdk pbe encrypt : " + Base64.encodeBase64String(result));
            //解密
            cipher.init(Cipher.DECRYPT_MODE, key, pbeParameterSpec);
            result = cipher.doFinal(result);
            System.out.println("jdk pbe decrypt : " + new String(result));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

六实现效果