기능 추가 및 수정

- DB 기본 기능 수정
- 추가 요금 2000원 수정
- 라이센스 기능 추가

CheongBuk_MegaPark_Key_Management/LicenseChecker.cs

@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Management;
+using System.Security.Cryptography;
+using System.Net;
+
+namespace Cheongbuk_MegaPark_Key_Management
+{
+    public class LicenseChecker
+    {
+        public bool CheckLicense()
+        {
+            string webDatas;
+            using (WebClient webClient = new WebClient())
+            {
+                try
+                {
+                    webDatas = webClient.DownloadString("https://raw.githubusercontent.com/crudelis/CMPKM/main/license");
+                }
+                catch
+                {
+                    webDatas = "";
+                }
+            }
+            string[] certifiedLicenses = webDatas.Split(new string[] { "\r\n", "\r", "\n" },    StringSplitOptions.None);
+            certifiedLicenses = certifiedLicenses.Where(x => !string.IsNullOrEmpty(x)).ToArray();
+            string localLicenseCode =  GetLocalLicense();
+            foreach (var certified in certifiedLicenses)
+            {
+                if (certified == localLicenseCode)
+                    return true;
+            }
+            return false;
+        }
+        private string GetLocalLicense()
+        {
+            string localBoardCode = GetBaseBoardCode();
+            string md5LocalBoardCode = GetMD5(localBoardCode);
+            System.IO.File.WriteAllText("license", md5LocalBoardCode);
+            return md5LocalBoardCode;
+        }
+        private string GetBaseBoardCode()
+        {
+            string query = "SELECT * FROM Win32_BaseBoard";
+            ManagementObjectSearcher searcher = new ManagementObjectSearcher(query);
+            List<string> serialNumbers = new List<string>();
+            foreach (var mObject in searcher.Get())
+            {
+                serialNumbers.Add(mObject.GetPropertyValue("SerialNumber").ToString());
+            }
+            return serialNumbers[0];
+        }
+        private string GetMD5(string data)
+        {
+            using (MD5 md5 = MD5.Create())
+            {
+                byte[] input = Encoding.ASCII.GetBytes(data);
+                byte[] hash = md5.ComputeHash(input);
+                StringBuilder sb = new StringBuilder();
+                for (int i = 0; i < hash.Length; i++)
+                {
+                    sb.Append(hash[i].ToString("X2"));
+                }
+                return sb.ToString();  
+            }
+        }
+    }
+
+    
+
+}