java 中DH的方式实现非对称加密的实例

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();     }    }  } 

双方密钥相同 DES : da1cc13d388423e82a110539414b1ec0 解密结果为 : Hello,sahadev!