java中密钥交换算法DH怎么用
小编给大家分享一下java中密钥交换算法DH怎么用，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
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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
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
以上是“java中密钥交换算法DH怎么用”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注创新互联行业资讯频道！
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