万秀猪王20130223,美女揪痧,除铁器厂家
本文实例讲述了java密钥交换算法dh定义与应用。分享给大家供大家参考，具体如下：
一 对称加密缺点
密钥传递过程复杂，这是对称加密带来的困扰。
二 dh密钥交换算法特点
构建本地密钥
双方密钥一致
三 dh相关参数
四 dh算法实现过程
1、初始化发送方的密钥（keypairgenerator、keypair、publickey）
2、初始化接受方的密钥（keyfactory、x509encodedkeyspec、dhpublickey、dhparameterspec、keypairgenerator、privatekey）
3、密钥构建（keyageement、secretkey、keyfactory、x509encodekeyspec、publickey）
4、加密和解密（cipher）
五 dh代码实现过程
我要评论
package com.imooc.security.dh;
import java.security.keyfactory;
import java.security.keypair;
import java.security.keypairgenerator;
import java.security.privatekey;
import java.security.publickey;
import java.security.spec.x509encodedkeyspec;
import javax.crypto.cipher;
import javax.crypto.keyagreement;
import javax.crypto.secretkey;
import javax.crypto.interfaces.dhpublickey;
import javax.crypto.spec.dhparameterspec;
import org.apache.commons.codec.binary.base64;
//import com.sun.org.apache.xalan.internal.utils.objects;
public class imoocdh {
private static string src = "cakin24 security dh";
public static void main(string[] args) {
jdkdh();
}
public static void jdkdh() {
try {
//1.初始化发送方密钥
keypairgenerator senderkeypairgenerator = keypairgenerator.getinstance("dh");
senderkeypairgenerator.initialize(512);
keypair senderkeypair = senderkeypairgenerator.generatekeypair();
byte[] senderpublickeyenc = senderkeypair.getpublic().getencoded();//发送方公钥，发送给接收方（网络、文件。。。）
//2.初始化接收方密钥
keyfactory receiverkeyfactory = keyfactory.getinstance("dh");
x509encodedkeyspec x509encodedkeyspec = new x509encodedkeyspec(senderpublickeyenc);
publickey receiverpublickey = receiverkeyfactory.generatepublic(x509encodedkeyspec);
dhparameterspec dhparameterspec = ((dhpublickey)receiverpublickey).getparams();
keypairgenerator receiverkeypairgenerator = keypairgenerator.getinstance("dh");
receiverkeypairgenerator.initialize(dhparameterspec);
keypair receiverkeypair = receiverkeypairgenerator.generatekeypair();
privatekey receiverprivatekey = receiverkeypair.getprivate();
byte[] receiverpublickeyenc = receiverkeypair.getpublic().getencoded();
//3.密钥构建
keyagreement receiverkeyagreement = keyagreement.getinstance("dh");
receiverkeyagreement.init(receiverprivatekey);
receiverkeyagreement.dophase(receiverpublickey, true);
secretkey receiverdeskey = receiverkeyagreement.generatesecret("des");
keyfactory senderkeyfactory = keyfactory.getinstance("dh");
x509encodedkeyspec = new x509encodedkeyspec(receiverpublickeyenc);
publickey senderpublickey = senderkeyfactory.generatepublic(x509encodedkeyspec);
keyagreement senderkeyagreement = keyagreement.getinstance("dh");
senderkeyagreement.init(senderkeypair.getprivate());
senderkeyagreement.dophase(senderpublickey, true);
secretkey senderdeskey = senderkeyagreement.generatesecret("des");
//if (objects.equals(receiverdeskey, senderdeskey)) {
if(receiverdeskey.equals(senderdeskey)){
system.out.println("双方密钥相同");
}
//4.加密
cipher cipher = cipher.getinstance("des");
cipher.init(cipher.encrypt_mode, senderdeskey);
byte[] result = cipher.dofinal(src.getbytes());
system.out.println("jdk dh encrypt : " + base64.encodebase64string(result));
//5.解密
cipher.init(cipher.decrypt_mode, receiverdeskey);
result = cipher.dofinal(result);
system.out.println("jdk dh decrypt : " + new string(result));
} catch (exception e) {
e.printstacktrace();
}
}
}
六 实现效果
双方密钥相同
jdk dh encrypt : wqnkvpqve05ud64ocqgxcqu5rcssevsu
jdk dh decrypt : cakin24 security dh
七 应用场景
ps：关于加密解密感兴趣的朋友还可以参考本站在线工具：
文字在线加密解密工具（包含aes、des、rc4等）：
md5在线加密工具:
在线散列/哈希算法加密工具:
在线md5/hash/sha-1/sha-2/sha-256/sha-512/sha-3/ripemd-160加密工具：
在线sha1/sha224/sha256/sha384/sha512加密工具：
如对本文有疑问，请在下面进行留言讨论，广大热心网友会与你互动！！ 点击进行留言回复
浅析我对 String、StringBuilder、StringBuffer 的理解
使用IDEA搭建SSM框架的详细教程(spring + springMVC +MyBatis)
Springboot整合freemarker 404问题解决方案
引入mybatis-plus报 Invalid bound statement错误问题的解决方法
网友评论