java中密钥交换算法DH怎么用
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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
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