功能更新

KeyGen/MainWindow.xaml.cs

@@ -3,6 +3,7 @@ using System.IO;
 using System.Security.Cryptography;
 using System.Text;
 using System.Windows;
+using System.Windows.Controls;
 
 using iNKORE.UI.WPF.Modern;
 
@@ -174,7 +175,7 @@ namespace KeyGen
                 Message.Text = ($"导入文件私钥完成");
             }
         }
-        private void Button_ToggleTheme_Click(object sender, RoutedEventArgs e)
+        private void ToggleTheme_Click(object sender, RoutedEventArgs e)
         {
             if (ThemeManager.Current.ApplicationTheme == ApplicationTheme.Dark)
             {
@@ -185,5 +186,61 @@ namespace KeyGen
                 ThemeManager.Current.ApplicationTheme = ApplicationTheme.Dark;
             }
         }
+        /// <summary>
+        /// 生成通用的 6 位应急码
+        /// </summary>
+        /// <param name="durationTag">"1D", "7D", 或 "30D"</param>
+        public static string GenerateGlobalOTP(string durationTag, string salt)
+        {
+            string secret = salt + durationTag;
+
+            // 计算天数步长
+            long unixTime = (long)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds;
+            long step = unixTime / 86400;
+
+            byte[] secretBytes = Encoding.UTF8.GetBytes(secret);
+            // 字符表必须严格一致
+            string charset = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+            // 步长转 8 字节大端
+            byte[] stepBytes = BitConverter.GetBytes(step);
+            if (BitConverter.IsLittleEndian) Array.Reverse(stepBytes);
+            byte[] msg = new byte[8];
+            Array.Copy(stepBytes, 0, msg, 8 - stepBytes.Length, stepBytes.Length);
+
+            using (var hmac = new HMACSHA1(Encoding.UTF8.GetBytes(secret)))
+            {
+                byte[] hash = hmac.ComputeHash(msg);
+                int offset = hash[hash.Length - 1] & 0xf;
+                uint binary = (uint)(((hash[offset] & 0x7f) << 24) | ((hash[offset + 1] & 0xff) << 16) | ((hash[offset + 2] & 0xff) << 8) | (hash[offset + 3] & 0xff));
+
+                string code = "";
+                for (int i = 0; i < 6; i++)
+                {
+                    code += charset[(int)(binary % (uint)charset.Length)];
+                    binary /= (uint)charset.Length;
+                }
+                return code;
+            }
+        }
+
+        private void DynamicLicenseClick(object sender, RoutedEventArgs e)
+        {
+            if (DynamicDurationComboBox.SelectedItem is not ComboBoxItem selectedItem)
+            {
+                Message.Text = ("请选择授权时长");
+                return;
+            }
+            if (string.IsNullOrEmpty(SaltTextBox.Text))
+            {
+                Message.Text = ("请设置Salt值");
+                return;
+            }
+            string durationTag = selectedItem.Tag.ToString();
+            string salt = SaltTextBox.Text.Trim();
+            string globalOTP = GenerateGlobalOTP(durationTag, salt);
+            DynamicLicenseTextBox.Text = globalOTP;
+            Clipboard.SetText(globalOTP);
+            Message.Text = "动态应急码已复制！";
+        }
     }
 }