From 50c6237e3728fe870b5b0ff4af59063bb0bc04cd Mon Sep 17 00:00:00 2001
From: liujie <1793218484@qq.com>
Date: 星期日, 27 七月 2025 09:06:18 +0800
Subject: [PATCH] update
---
DriverQYTTravel/guns-admin/src/main/java/com/stylefeng/guns/modular/system/util/zhenglian/SM4Util.java | 95 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 95 insertions(+), 0 deletions(-)
diff --git a/DriverQYTTravel/guns-admin/src/main/java/com/stylefeng/guns/modular/system/util/zhenglian/SM4Util.java b/DriverQYTTravel/guns-admin/src/main/java/com/stylefeng/guns/modular/system/util/zhenglian/SM4Util.java
new file mode 100644
index 0000000..5f2e18b
--- /dev/null
+++ b/DriverQYTTravel/guns-admin/src/main/java/com/stylefeng/guns/modular/system/util/zhenglian/SM4Util.java
@@ -0,0 +1,95 @@
+package com.stylefeng.guns.modular.system.util.zhenglian;
+
+import org.bouncycastle.jce.provider.BouncyCastleProvider;
+
+import javax.crypto.Cipher;
+import javax.crypto.KeyGenerator;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.SecretKeySpec;
+import java.nio.charset.StandardCharsets;
+import java.security.Security;
+import java.util.Base64;
+
+/**
+ * SM4国密工具类
+ * @author zhibing.pu
+ * @Date 2025/7/24 15:29
+ */
+public class SM4Util {
+ private static final String ALGORITHM_NAME = "SM4";
+
+ private static final String ALGORITHM_MODE = "SM4/ECB/PKCS5Padding";
+
+
+ static {
+ Security.addProvider(new BouncyCastleProvider());
+ }
+
+ /**
+ * 生成 SM4 密钥
+ * @return 密钥的 Base64 编码字符串
+ * @throws Exception 异常
+ */
+ public static String generateKey() throws Exception {
+ KeyGenerator kg = KeyGenerator.getInstance(ALGORITHM_NAME, "BC");
+ kg.init(128);
+ SecretKey secretKey = kg.generateKey();
+ return Base64.getEncoder().encodeToString(secretKey.getEncoded());
+ }
+
+ /**
+ * SM4 加密
+ * @param plainText 明文
+ * @param key 密钥的 Base64 编码字符串
+ * @return 密文的 Base64 编码字符串
+ * @throws Exception 异常
+ */
+ public static String encrypt(String plainText, String key) throws Exception {
+ byte[] keyBytes = Base64.getDecoder().decode(key);
+ SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, ALGORITHM_NAME);
+ Cipher cipher = Cipher.getInstance(ALGORITHM_MODE, "BC");
+ cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
+ byte[] encryptedBytes = cipher.doFinal(plainText.getBytes(StandardCharsets.UTF_8));
+ return Base64.getEncoder().encodeToString(encryptedBytes);
+ }
+
+ /**
+ * SM4 解密
+ * @param cipherText 密文的 Base64 编码字符串
+ * @param key 密钥的 Base64 编码字符串
+ * @return 明文
+ * @throws Exception 异常
+ */
+ public static String decrypt(String cipherText, String key) throws Exception {
+ byte[] keyBytes = Base64.getDecoder().decode(key);
+ SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, ALGORITHM_NAME);
+ Cipher cipher = Cipher.getInstance(ALGORITHM_MODE, "BC");
+ cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
+ byte[] cipherBytes = Base64.getDecoder().decode(cipherText);
+ byte[] decryptedBytes = cipher.doFinal(cipherBytes);
+ return new String(decryptedBytes, StandardCharsets.UTF_8);
+ }
+
+ public static void main(String[] args) {
+ try {
+ // 生成密钥
+ String key = generateKey();
+ System.out.println("生成的密钥: " + key);
+
+ // 明文
+ String plainText = "Hello, SM4!";
+ System.out.println("明文: " + plainText);
+
+ // 加密
+ String cipherText = encrypt(plainText, key);
+ System.out.println("密文: " + cipherText);
+
+ // 解密
+ String decryptedText = decrypt(cipherText, key);
+ System.out.println("解密后的明文: " + decryptedText);
+ } catch (Exception e) {
+ e.printStackTrace();
+ }
+ }
+
+}
--
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