实现代码：
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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：
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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！
原文链接：http://blog.csdn.net/sahadev_/article/details/48773767
