feat: jwt application

RsaKeyLoader/KeyLoader.cs

@@ -4,10 +4,32 @@ namespace RsaKeyLoader;
 
 public class KeyLoader
 {
-    public void Generate(string path)
+    public static string PathString =
+        Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), "auth-key");
+    public static RSA GetGeneratedKey()
+    {
+        if (File.Exists(PathString))
+        {
+            return LoadKey(PathString);
+        }
+        else
+        {
+            Generate(PathString);
+            return LoadKey(PathString);
+        }
+    }
+    
+    public static void Generate(string path)
     {
         var rsaKey = RSA.Create();
         var privateKey = rsaKey.ExportRSAPrivateKey();
         File.WriteAllBytes(path, privateKey);
     }
+
+    public static RSA LoadKey(string path)
+    {
+        var rsaKey = RSA.Create();
+        rsaKey.ImportRSAPrivateKey(File.ReadAllBytes(path), out _);
+        return rsaKey;
+    }
 }