feat: 添加MD5加密工具类

ccdi-lsfx/src/main/java/com/ruoyi/lsfx/util/MD5Util.java

@@ -0,0 +1,45 @@
+package com.ruoyi.lsfx.util;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+/**
+ * MD5加密工具类
+ */
+public class MD5Util {
+
+    /**
+     * MD5加密
+     * @param input 待加密字符串
+     * @return MD5加密后的32位小写字符串
+     */
+    public static String encrypt(String input) {
+        try {
+            MessageDigest md = MessageDigest.getInstance("MD5");
+            byte[] messageDigest = md.digest(input.getBytes());
+            StringBuilder hexString = new StringBuilder();
+            for (byte b : messageDigest) {
+                String hex = Integer.toHexString(0xff & b);
+                if (hex.length() == 1) {
+                    hexString.append('0');
+                }
+                hexString.append(hex);
+            }
+            return hexString.toString();
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException("MD5加密失败", e);
+        }
+    }
+
+    /**
+     * 生成安全码
+     * @param projectNo 项目编号
+     * @param entityName 项目名称
+     * @param appSecret 应用密钥
+     * @return MD5安全码
+     */
+    public static String generateSecretCode(String projectNo, String entityName, String appSecret) {
+        String raw = projectNo + "_" + entityName + "_" + appSecret;
+        return encrypt(raw);
+    }
+}