本文实例讲述了java实现的对称加密算法3des定义与用法。分享给大家供大家参考,具体如下:
一 为什么出现3des
1、返回柯克霍夫原则
2、存在安全问题
二 3des(triple des或desede)好处
1、密钥长度增强
2、迭代次数提高
三 3des相关参数
四 3des代码实现
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package com.imooc.security.des; import java.security.key; import java.security.securerandom; import javax.crypto.cipher; import javax.crypto.keygenerator; import javax.crypto.secretkey; import javax.crypto.secretkeyfactory; import javax.crypto.spec.desedekeyspec; import org.apache.commons.codec.binary.base64; public class imooc3des { private static string src = "cakin24 security 3des" ; public static void main(string[] args) { jdk3des(); } public static void jdk3des() { try { //生成key keygenerator keygenerator = keygenerator.getinstance( "desede" ); //keygenerator.init(168); keygenerator.init( new securerandom()); //默认长度 secretkey secretkey = keygenerator.generatekey(); byte [] byteskey = secretkey.getencoded(); //key转换 desedekeyspec desedekeyspec = new desedekeyspec(byteskey); secretkeyfactory factory = secretkeyfactory.getinstance( "desede" ); key convertsecretkey = factory.generatesecret(desedekeyspec); //加密 cipher cipher = cipher.getinstance( "desede/ecb/pkcs5padding" ); cipher.init(cipher.encrypt_mode, convertsecretkey); byte [] result = cipher.dofinal(src.getbytes()); system.out.println( "jdk 3des encrypt : " + base64.encodebase64string(result)); //解密 cipher.init(cipher.decrypt_mode, convertsecretkey); result = cipher.dofinal(result); system.out.println( "jdk 3des decrypt : " + new string(result)); } catch (exception e) { e.printstacktrace(); } } } |
五 实现效果
jdk 3des encrypt : 6t7a/rnardzsl+mtezvbfxwnnzr0yjbw
jdk 3des decrypt : cakin24 security 3des
注:这里引入了org.apache.commons.codec.binary.base64
包,可点击此处本站下载。
希望本文所述对大家java程序设计有所帮助。
原文链接:https://blog.csdn.net/chengqiuming/article/details/78746057