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!