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
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 : wqnKvpQve05UD64OCQGXcQu5rcssEVSujdk 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）：http://tools.jb51.net/password/txt_encode
MD5在线加密工具:http://tools.jb51.net/password/CreateMD5Password
在线散列/哈希算法加密工具:http://tools.jb51.net/password/hash_encrypt
在线MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具：http://tools.jb51.net/password/hash_md5_sha
在线sha1/sha224/sha256/sha384/sha512加密工具：http://tools.jb51.net/password/sha_encode
更多关于java相关内容感兴趣的读者可查看本站专题：《Java数学运算技巧总结》、《Java数据结构与算法教程》、《Java字符与字符串操作技巧总结》、《Java操作DOM节点技巧总结》和《Java缓存操作技巧汇总》
希望本文所述对大家java程序设计有所帮助。
本文标题: java密钥交换算法DH定义与应用实例分析
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