主要更新了http相关的内容

Ramitta/CryptoHelper.cs

@@ -1,10 +1,6 @@
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
+using System.IO;
 using System.Security.Cryptography;
 using System.Text;
-using System.Threading.Tasks;
 using System.Windows;
 
 namespace Ramitta.lib
@@ -156,7 +152,7 @@ namespace Ramitta.lib
                     return Convert.ToBase64String(signature);
                 }
             }
-            catch (Exception ex)
+            catch (Exception)
             {
                 return null;
             }
@@ -179,7 +175,7 @@ namespace Ramitta.lib
                     return Encoding.UTF8.GetString(decryptedBytes);
                 }
             }
-            catch (Exception ex)
+            catch (Exception)
             {
                 return null;
             }
@@ -251,7 +247,7 @@ namespace Ramitta.lib
                     return Convert.ToBase64String(signature);
                 }
             }
-            catch (Exception ex)
+            catch (Exception)
             {
                 return null;
             }