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java 中DH的方式实现非对称加密的实例

2019年07月19日  | 移动技术网IT编程  | 我要评论

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java 中dh的方式实现非对称加密的实例

实现代码：

package com.sahadev; 
 
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 java.util.objects; 
 
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.hex; 
 
public class dh { 
 
  public static string src = "hello,sahadev!"; 
 
  public static void main(string[] args) { 
    jdkdh(); 
  } 
 
  public static void jdkdh() { 
    try { 
      // 初始化发送方密钥 
      keypairgenerator senderkeypairgenerator = keypairgenerator.getinstance("dh"); 
      senderkeypairgenerator.initialize(512); 
      keypair senderkeypair = senderkeypairgenerator.generatekeypair(); 
      byte[] senderpublickey = senderkeypair.getpublic().getencoded(); 
 
      // 初始化接收方的密钥 
      keyfactory instance = keyfactory.getinstance("dh"); 
      x509encodedkeyspec x509encodedkeyspec = new x509encodedkeyspec(senderpublickey); 
      publickey sendpublickeytemp = instance.generatepublic(x509encodedkeyspec); 
      dhparameterspec dhparameterspec = ((dhpublickey) sendpublickeytemp).getparams(); 
      keypairgenerator keypairgenerator = keypairgenerator.getinstance("dh"); 
      keypairgenerator.initialize(dhparameterspec); 
      // 接收方生成密钥 
      keypair generatekeypair = keypairgenerator.generatekeypair(); 
      byte[] receiverpublickey = generatekeypair.getpublic().getencoded(); 
      privatekey receiverprivatekey = generatekeypair.getprivate(); 
 
      // 接收方密钥构建 
      keyagreement receiverkeyagreement = keyagreement.getinstance("dh"); 
      receiverkeyagreement.init(receiverprivatekey); 
      receiverkeyagreement.dophase(senderkeypair.getpublic(), true); 
      // 使用我的密钥和你的公钥生成密钥 
      secretkey receiverdeskey = receiverkeyagreement.generatesecret("des"); 
 
      // 发送方密钥构建 
      keyfactory keyfactory = keyfactory.getinstance("dh"); 
      x509encodedkeyspec x509encodedkeyspec2 = new x509encodedkeyspec(receiverpublickey); 
      publickey receiverpublickeytemp = keyfactory.generatepublic(x509encodedkeyspec2); 
 
      // 发送方拿到接收方返回的公钥做本地密钥 
      keyagreement senderkeyagreement = keyagreement.getinstance("dh"); 
      senderkeyagreement.init(senderkeypair.getprivate()); 
      senderkeyagreement.dophase(receiverpublickeytemp, true); 
      // 使用你的密钥我的公钥进行构建 
      secretkey senderdeskey = senderkeyagreement.generatesecret("des"); 
 
      // 判断双方的本地密钥是否相同 
      if (objects.equals(receiverdeskey, senderdeskey)) { 
        system.out.println("双方密钥相同"); 
      } 
 
      // 加密 
      cipher cipher = cipher.getinstance("des"); 
      cipher.init(cipher.encrypt_mode, senderdeskey); 
      byte[] result = cipher.dofinal(src.getbytes()); 
      system.out.println("加密结果为 : " + hex.encodehexstring(result)); 
 
      // 解密 
      cipher.init(cipher.decrypt_mode, senderdeskey); 
      result = cipher.dofinal(result); 
      system.out.println("解密结果为 : " + new string(result)); 
    } catch (exception e) { 
      e.printstacktrace(); 
    } 
 
  } 
 
}

附上结果：  

双方密钥相同 
des : da1cc13d388423e82a110539414b1ec0 
解密结果为 : hello,sahadev!

以上就是dh实现非对称加密的实例，如有 疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！

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