Now supports reading secretKey from the database to calculate totp。

But there are some known bugs that need to be resolved.

OTP/Form1.Designer.cs

@@ -46,6 +46,7 @@
             this.listBox1.Name = "listBox1";
             this.listBox1.Size = new System.Drawing.Size(473, 368);
             this.listBox1.TabIndex = 0;
+            this.listBox1.SelectedIndexChanged += new System.EventHandler(this.listBox1_SelectedIndexChanged);
             // 
             // label1
             // 
@@ -61,6 +62,7 @@
             // 
             // button1
             // 
+            this.button1.Enabled = false;
             this.button1.Location = new System.Drawing.Point(556, 294);
             this.button1.Name = "button1";
             this.button1.Size = new System.Drawing.Size(85, 23);
@@ -171,6 +173,8 @@
             this.Name = "Form1";
             this.Text = "Main Window";
             this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
+            this.Load += new System.EventHandler(this.Form1_Load);
+            this.VisibleChanged += new System.EventHandler(this.Form1_VisibleChanged);
             this.ResumeLayout(false);
             this.PerformLayout();
 

OTP/Form1.cs

@@ -8,6 +8,10 @@ using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
 using OtpNet;
+using System.IO;
+using System.Data.SQLite;
+using System.Reflection;
+using ZXing.QrCode.Internal;
 
 namespace OTP
 {
@@ -16,18 +20,28 @@ namespace OTP
         private byte[] secretKey;
         private Totp totp;
         private Timer timer;
+        private string connectionString = "Data Source=key.db;Version=3;";
+        private string embeddedDatabaseResource = "OTP.empty_key.db";
+        private int runonce=0;
 
         public Form1()
         {
             InitializeComponent();
-
+            //button1.Enabled = false;
-            secretKey = Base32Encoding.ToBytes("JBSWY3DPEHPK3PXP"); // 示例的 base32 编码
+            //secretKey = Base32Encoding.ToBytes("JBSWY3DPEHPK3PXP"); // 示例的 base32 编码
-            totp = new Totp(secretKey);
+            //totp = new Totp(secretKey);
 
             timer = new Timer();
             timer.Interval = 1000; // 设置计时器间隔为 1 秒
             timer.Tick += Timer_Tick;
         }
+        public class TitleInfo
+        {
+            public int Id { get; set; }
+            public string Title { get; set; }
+            public string SecretKey { get; set; }
+        }
+
 
         private void Timer_Tick(object sender, EventArgs e)
         {
@@ -55,17 +69,106 @@ namespace OTP
         {
             button1.Enabled = false; // 禁用生成按钮
             button2.Enabled = true; // 启用复制按钮
+            if (totp != null)
+            {
                 GenerateAndDisplayTotp(); // 生成并显示 TOTP 密码
-
+                timer.Start();// 开始计时器
-            // 开始计时器
+            }
-            timer.Start();
         }
 
         private void Form1_Load(object sender, EventArgs e)
         {
-            button1.Enabled = true; // 在窗体加载时启用按钮
+            //button1.Enabled = true; // 在窗体加载时启用按钮
+            // 判断是否存在 key.db 数据库文件
+            if (!File.Exists("key.db"))
+            {
+                ExtractEmbeddedDatabase();
             }
 
+            
+        }
+        private void ExtractEmbeddedDatabase()
+        {
+            // 从嵌入的资源中复制数据库文件到同目录下
+            try
+            {
+                using (Stream resourceStream = Assembly.GetExecutingAssembly().GetManifestResourceStream(embeddedDatabaseResource))
+                {
+                    using (FileStream fileStream = new FileStream("key.db", FileMode.Create))
+                    {
+                        resourceStream.CopyTo(fileStream);
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"An error occurred while extracting embedded database: {ex.Message}");
+            }
+        }
+
+        private void LoadTitlesToListBox()
+        {
+            try
+            {
+                using (SQLiteConnection connection = new SQLiteConnection(connectionString))
+                {
+                    connection.Open();
+
+                    using (SQLiteCommand command = new SQLiteCommand("SELECT Id, Title, SecretKey FROM TotpData", connection))
+                    {
+                        using (SQLiteDataReader reader = command.ExecuteReader())
+                        {
+                            listBox1.Items.Clear(); // 清空现有数据
+                            while (reader.Read())
+                            {
+                                int id = reader.GetInt32(0);
+                                string title = reader.GetString(1);
+                                string secretKey = reader.GetString(2);
+
+                                TitleInfo titleInfo = new TitleInfo
+                                {
+                                    Id = id,
+                                    Title = title,
+                                    SecretKey = secretKey
+                                };
+
+                                listBox1.Items.Add(titleInfo);
+                            }
+                        }
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"An error occurred while loading titles: {ex.Message}");
+            }
+        }
+
+        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            if (listBox1.SelectedIndex >= 0) // Ensure an item is selected
+            {
+                TitleInfo selectedTitleInfo = listBox1.SelectedItem as TitleInfo;
+                if (selectedTitleInfo != null)
+                {
+                    if (runonce == 0)
+                    {
+                        button1.Enabled = true;
+                        runonce++;
+                    }
+                    secretKey = Base32Encoding.ToBytes(selectedTitleInfo.SecretKey);
+                    totp = new Totp(secretKey);
+                    //string totpCode = totp.ComputeTotp();
+                    //label1.Text = totpCode;
+                }
+                else
+                {
+                    MessageBox.Show("Selected item is not of the expected type.");
+                }
+            }
+        }
+
+
         private void button2_Click(object sender, EventArgs e)
         {
             Clipboard.SetText(label1.Text);
@@ -95,5 +198,21 @@ namespace OTP
             // 如果用户选择 Yes，什么都不需要做，窗体会继续关闭
         }
 
+        private void Form1_VisibleChanged(object sender, EventArgs e)
+        {
+            if (this.Visible) // 检查窗体是否可见
+            {
+                LoadTitlesToListBox();
+                runonce = 0;
+                label1.Text = "TOTP Code";
+                button1.Enabled = false;
+                button2.Enabled = false;
+            }
+            else
+            {
+                timer.Stop();
+            }
+        }
+
     }
 }

OTP/Form2.Designer.cs

@@ -81,6 +81,7 @@
             this.button2.TabIndex = 2;
             this.button2.Text = "Delete Record(s)";
             this.button2.UseVisualStyleBackColor = true;
+            this.button2.Click += new System.EventHandler(this.button2_Click);
             // 
             // button3
             // 
@@ -90,6 +91,7 @@
             this.button3.TabIndex = 3;
             this.button3.Text = "Save Changes";
             this.button3.UseVisualStyleBackColor = true;
+            this.button3.Click += new System.EventHandler(this.button3_Click);
             // 
             // button4
             // 
@@ -99,17 +101,20 @@
             this.button4.TabIndex = 4;
             this.button4.Text = "Discard Changes";
             this.button4.UseVisualStyleBackColor = true;
+            this.button4.Click += new System.EventHandler(this.button4_Click);
             // 
             // Form2
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(619, 367);
+            this.ControlBox = false;
             this.Controls.Add(this.button4);
             this.Controls.Add(this.button3);
             this.Controls.Add(this.button2);
             this.Controls.Add(this.button1);
             this.Controls.Add(this.panel1);
+            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
             this.Name = "Form2";
             this.Text = "Data Manage";
             this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form2_FormClosing);

OTP/Form2.cs

@@ -8,19 +8,82 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows.Forms;
+using System.IO;
+using System.Security.Cryptography;
 
 namespace OTP
 {
     public partial class Form2 : Form
     {
         private string connectionString = "Data Source=key.db;Version=3;";
+        private string backupPath = "key.db.bak"; // 备份数据库文件的路径
+        private string sourceFileHash = ""; // 原始数据库文件的哈希值
 
         public Form2()
         {
             InitializeComponent();
             InitializeDataGridView();
+            // 获取原始数据库文件的哈希值
+            sourceFileHash = CalculateSHA256Hash("key.db");
+            // 备份数据库文件并判断完整性
+            bool backupSuccessful = BackupDatabase();
+
+            if (!backupSuccessful)
+            {
+                // 备份创建失败，禁用按钮并提示用户
+                button1.Enabled = false;
+                button2.Enabled = false;
+                button3.Enabled = false;
+
+                MessageBox.Show("Backup of data failed, modification is prohibited.", "Backup Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+            }
             LoadData();
         }
+        private bool BackupDatabase()
+        {
+            try
+            {
+                if (File.Exists("key.db"))
+                {
+                    // 备份数据库文件
+                    File.Copy("key.db", backupPath, true);
+
+                    // 计算备份文件的哈希值
+                    string backupFileHash = CalculateSHA256Hash(backupPath);
+
+                    // 比较原始文件和备份文件的哈希值
+                    if (sourceFileHash == backupFileHash)
+                    {
+                        return true; // 备份创建成功且完整性通过
+                    }
+                    else
+                    {
+                        return false; // 备份创建成功但完整性未通过
+                    }
+                }
+                else
+                {
+                    return false; // 原始文件不存在，备份创建失败
+                }
+            }
+            catch (Exception)
+            {
+                return false; // 备份创建失败
+            }
+        }
+        // 计算文件的SHA-256哈希值
+        private string CalculateSHA256Hash(string filePath)
+        {
+            using (SHA256 sha256 = SHA256.Create())
+            {
+                using (FileStream stream = File.OpenRead(filePath))
+                {
+                    byte[] hashBytes = sha256.ComputeHash(stream);
+                    return BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
+                }
+            }
+        }
+
 
         private void InitializeDataGridView()
         {
@@ -34,19 +97,23 @@ namespace OTP
             {
                 connection.Open();
 
-                using (SQLiteCommand command = new SQLiteCommand("SELECT Title FROM TotpData", connection))
+                using (SQLiteCommand command = new SQLiteCommand("SELECT Id, Title FROM TotpData", connection))
                 {
                     using (SQLiteDataReader reader = command.ExecuteReader())
                     {
                         while (reader.Read())
                         {
-                            dataGridView1.Rows.Add(reader.GetString(0));
+                            int id = reader.GetInt32(0);
+                            string title = reader.GetString(1);
+                            dataGridView1.Rows.Add(title);
+                            dataGridView1.Rows[dataGridView1.Rows.Count - 1].Tag = id; // 将 Id 存储在行的 Tag 属性中
                         }
                     }
                 }
             }
         }
 
+
         private void button1_Click(object sender, EventArgs e)
         {
             using (Form3 form3 = new Form3())
@@ -70,6 +137,89 @@ namespace OTP
             }
         }
 
+        private void button2_Click(object sender, EventArgs e)
+        {
+            try
+            {
+                // 获取选中的行
+                foreach (DataGridViewRow selectedRow in dataGridView1.SelectedRows)
+                {
+                    // 获取选中行的数据
+                    int id = (int)selectedRow.Tag; // 从行的 Tag 属性获取 Id 值
+
+                    // 执行删除数据库记录的操作
+                    DeleteRecordFromDatabase(id);
+
+                    // 从 DataGridView 中移除选中行
+                    dataGridView1.Rows.Remove(selectedRow);
+                }
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"An error occurred while deleting the record: {ex.Message}");
+            }
+        }
+
+        private void DeleteRecordFromDatabase(int recordId)
+        {
+            try
+            {
+                using (SQLiteConnection connection = new SQLiteConnection(connectionString))
+                {
+                    connection.Open();
+
+                    using (SQLiteCommand command = new SQLiteCommand("DELETE FROM TotpData WHERE ID = @ID", connection))
+                    {
+                        command.Parameters.AddWithValue("@ID", recordId);
+                        command.ExecuteNonQuery();
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"An error occurred while deleting the record: {ex.Message}");
+            }
+        }
+
+        private void button3_Click(object sender, EventArgs e)
+        {
+            // 删除备份文件
+            if (File.Exists(backupPath))
+            {
+                File.Delete(backupPath);
+            }
+
+            // 关闭当前的 Form2 实例，返回到 Form1
+            this.Close();
+        }
+
+        private void button4_Click(object sender, EventArgs e)
+        {
+            try
+            {
+                // 恢复备份文件
+                if (File.Exists(backupPath))
+                {
+                    File.Copy(backupPath, "key.db", true);
+
+                    // 删除备份文件
+                    File.Delete(backupPath);
+
+                    MessageBox.Show("The operation was successful.", "Undo Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
+                }
+                else
+                {
+                    MessageBox.Show("No backup file found to undo changes.", "Undo Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                }
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"An error occurred while undoing changes: {ex.Message}", "Undo Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+            }
+
+            // 关闭当前的 Form2 实例，返回到 Form1，不进行保存操作
+            this.Close();
+        }
 
     }
 }

OTP/OTP.csproj

@@ -156,9 +156,8 @@
       <AutoGen>True</AutoGen>
       <DependentUpon>Resources.resx</DependentUpon>
     </Compile>
-    <None Include="key.db">
+    <EmbeddedResource Include="empty_key.db" />
-      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    <None Include="key.db" />
-    </None>
     <None Include="packages.config" />
     <None Include="Properties\Settings.settings">
       <Generator>SettingsSingleFileGenerator</Generator>