Password Manager (.NET)

/**************************************************************************
   THIS CODE AND INFORMATION IS PROVIDED 'AS IS' WITHOUT WARRANTY OF
   ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
   THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
   PARTICULAR PURPOSE.
   Author: Leon Finker  7/2003
**************************************************************************/
#region using
using System;
using System.Resources;
using System.Security.Permissions;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.Reflection;
using System.Xml;
using System.Text;
using System.IO;
using System.Drawing;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Security.Cryptography;
using System.Collections.Generic;
#endregion

namespace passkeep
{
	internal struct UserData
	{
		internal string user;
		internal string pass;
	}
    [StructLayout(LayoutKind.Sequential)]
    internal struct SeqPoint
    {
        internal int x, y;
    }
    [StructLayout(LayoutKind.Sequential)]
    internal struct SeqRect
    {
        internal int left, top, right, bottom;
    }
	/// <summary>
	/// Summary description for PassInfoKeep.
	/// </summary>
	internal sealed class PassInfoKeep : System.Windows.Forms.Form, IMessageFilter
	{
		#region data members
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.IContainer components;
		private System.Windows.Forms.Button btnExit;
		private System.Windows.Forms.ComboBox cmbKeys;
		private System.Windows.Forms.MenuItem fileMenuItem;
		private System.Windows.Forms.MenuItem menuFileAdd;
		private System.Windows.Forms.MenuItem menuFileExit;
		private System.Windows.Forms.MainMenu menuFile;
		private System.Windows.Forms.Button btnDND;
		private System.Windows.Forms.Button btnSend;
		private System.Windows.Forms.Button btnCancel;
		private System.Windows.Forms.MenuItem menuDelete;
		private System.Windows.Forms.MenuItem menuItem1;
		private System.Windows.Forms.ToolTip tipSend;
		private System.Windows.Forms.Label lblService;
		private System.Windows.Forms.Label lblPass;
		private System.Windows.Forms.Label lblUser;
		private System.Windows.Forms.Button btnSendUser;
		private System.Windows.Forms.Button btnDNDUser;
		private System.Windows.Forms.GroupBox groupBox1;
		private System.Windows.Forms.GroupBox groupBox2;
		private System.Windows.Forms.GroupBox groupBox3;
		
        private Color     drawFrameBkColor, drawFrameBkColorPrev;
        private bool      startupMode;
		private string    assemblyPath;
        private string    datafile;
		private HybridDictionary id2pass;
		private ICryptoTransform encRij;
		private ICryptoTransform enc3des;		
		private ICryptoTransform decRij;
		private ICryptoTransform dec3des;
		
        private Rectangle previousRect, previousRect2;
		private Cursor cursorCurrent;
		private System.Windows.Forms.MenuItem menuAbout;
        private System.Windows.Forms.MenuItem menuImport;
        private System.Windows.Forms.OpenFileDialog openFileImport;
        private Timer timer1;
        private DateTime _lastUsed = DateTime.UtcNow;

		static private NotifyIcon notifyIcon;
		#endregion

        #region DLL Imports        
        [DllImport("gdi32.dll")]
        private static extern int GetBkColor(IntPtr hdc);
        [DllImport("user32.dll")]
        private static extern bool GetWindowRect(IntPtr hWnd, out SeqRect rect);
        [DllImport("user32.dll")]
        private static extern bool ScreenToClient(IntPtr hWnd, ref SeqPoint pt);
        [DllImport("user32.dll")]
        private static extern IntPtr GetParent(IntPtr hWnd);
        [DllImport("user32.dll")]
        private static extern IntPtr WindowFromPoint(SeqPoint pt);		
        [DllImport("user32.dll")]
        private static extern IntPtr RealChildWindowFromPoint(IntPtr hWndParent, SeqPoint Point);
        [DllImport("user32.dll", CharSet=CharSet.Auto, ThrowOnUnmappableChar=true)]
        private static extern bool SendMessage(IntPtr hWnd, Int32 msg, Int32 wParam, Int32 lParam);
        [DllImport("user32.dll")]
        private static extern bool RegisterHotKey(IntPtr hWnd, Int32 id, UInt32 fsModifiers, UInt32 vk);
        [DllImport("user32.dll")]
        private static extern bool UnregisterHotKey(IntPtr hWnd, Int32 id);
        #endregion

		internal PassInfoKeep(bool startup)
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			id2pass = new HybridDictionary();
            datafile = "data";
            startupMode = startup;
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
            this.components = new System.ComponentModel.Container();
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(PassInfoKeep));
            this.btnExit = new System.Windows.Forms.Button();
            this.cmbKeys = new System.Windows.Forms.ComboBox();
            this.menuFile = new System.Windows.Forms.MainMenu(this.components);
            this.fileMenuItem = new System.Windows.Forms.MenuItem();
            this.menuFileAdd = new System.Windows.Forms.MenuItem();
            this.menuDelete = new System.Windows.Forms.MenuItem();
            this.menuImport = new System.Windows.Forms.MenuItem();
            this.menuItem1 = new System.Windows.Forms.MenuItem();
            this.menuFileExit = new System.Windows.Forms.MenuItem();
            this.menuAbout = new System.Windows.Forms.MenuItem();
            this.lblService = new System.Windows.Forms.Label();
            this.btnDND = new System.Windows.Forms.Button();
            this.btnSend = new System.Windows.Forms.Button();
            this.btnCancel = new System.Windows.Forms.Button();
            this.tipSend = new System.Windows.Forms.ToolTip(this.components);
            this.lblPass = new System.Windows.Forms.Label();
            this.lblUser = new System.Windows.Forms.Label();
            this.btnSendUser = new System.Windows.Forms.Button();
            this.btnDNDUser = new System.Windows.Forms.Button();
            this.groupBox1 = new System.Windows.Forms.GroupBox();
            this.groupBox2 = new System.Windows.Forms.GroupBox();
            this.groupBox3 = new System.Windows.Forms.GroupBox();
            this.openFileImport = new System.Windows.Forms.OpenFileDialog();
            this.timer1 = new System.Windows.Forms.Timer(this.components);
            this.SuspendLayout();
            // 
            // btnExit
            // 
            this.btnExit.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.btnExit.Location = new System.Drawing.Point(80, 141);
            this.btnExit.Name = "btnExit";
            this.btnExit.Size = new System.Drawing.Size(74, 23);
            this.btnExit.TabIndex = 12;
            this.btnExit.Text = "&Exit";
            this.btnExit.Click += new System.EventHandler(this.btnExit_Click);
            // 
            // cmbKeys
            // 
            this.cmbKeys.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
            this.cmbKeys.Location = new System.Drawing.Point(79, 15);
            this.cmbKeys.Name = "cmbKeys";
            this.cmbKeys.Size = new System.Drawing.Size(152, 24);
            this.cmbKeys.Sorted = true;
            this.cmbKeys.TabIndex = 3;
            // 
            // menuFile
            // 
            this.menuFile.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
            this.fileMenuItem,
            this.menuAbout});
            // 
            // fileMenuItem
            // 
            this.fileMenuItem.Index = 0;
            this.fileMenuItem.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
            this.menuFileAdd,
            this.menuDelete,
            this.menuImport,
            this.menuItem1,
            this.menuFileExit});
            this.fileMenuItem.Text = "File";
            // 
            // menuFileAdd
            // 
            this.menuFileAdd.Index = 0;
            this.menuFileAdd.Shortcut = System.Windows.Forms.Shortcut.CtrlA;
            this.menuFileAdd.Text = "&Add/Replace...";
            this.menuFileAdd.Click += new System.EventHandler(this.menuFileAdd_Click);
            // 
            // menuDelete
            // 
            this.menuDelete.Index = 1;
            this.menuDelete.Shortcut = System.Windows.Forms.Shortcut.CtrlD;
            this.menuDelete.Text = "&Delete";
            this.menuDelete.Click += new System.EventHandler(this.menuDelete_Click);
            // 
            // menuImport
            // 
            this.menuImport.Index = 2;
            this.menuImport.Shortcut = System.Windows.Forms.Shortcut.CtrlI;
            this.menuImport.Text = "&Import...";
            this.menuImport.Click += new System.EventHandler(this.menuImport_Click);
            // 
            // menuItem1
            // 
            this.menuItem1.Index = 3;
            this.menuItem1.Text = "-";
            // 
            // menuFileExit
            // 
            this.menuFileExit.Index = 4;
            this.menuFileExit.Shortcut = System.Windows.Forms.Shortcut.AltF4;
            this.menuFileExit.Text = "&Exit";
            this.menuFileExit.Click += new System.EventHandler(this.btnExit_Click);
            // 
            // menuAbout
            // 
            this.menuAbout.Index = 1;
            this.menuAbout.Text = "&About";
            this.menuAbout.Click += new System.EventHandler(this.menuAbout_Click);
            // 
            // lblService
            // 
            this.lblService.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.lblService.Location = new System.Drawing.Point(13, 15);
            this.lblService.Name = "lblService";
            this.lblService.Size = new System.Drawing.Size(59, 23);
            this.lblService.TabIndex = 2;
            this.lblService.Text = "&Service:";
            // 
            // btnDND
            // 
            this.btnDND.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
            this.btnDND.Image = ((System.Drawing.Image)(resources.GetObject("btnDND.Image")));
            this.btnDND.Location = new System.Drawing.Point(79, 99);
            this.btnDND.Name = "btnDND";
            this.btnDND.Size = new System.Drawing.Size(26, 23);
            this.btnDND.TabIndex = 10;
            this.btnDND.MouseDown += new System.Windows.Forms.MouseEventHandler(this.btnDND_MouseDown);
            // 
            // btnSend
            // 
            this.btnSend.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
            this.btnSend.Image = ((System.Drawing.Image)(resources.GetObject("btnSend.Image")));
            this.btnSend.Location = new System.Drawing.Point(125, 99);
            this.btnSend.Name = "btnSend";
            this.btnSend.Size = new System.Drawing.Size(26, 23);
            this.btnSend.TabIndex = 11;
            this.btnSend.MouseMove += new System.Windows.Forms.MouseEventHandler(this.btnSend_MouseMove);
            this.btnSend.MouseDown += new System.Windows.Forms.MouseEventHandler(this.btnSend_MouseDown);
            this.btnSend.MouseUp += new System.Windows.Forms.MouseEventHandler(this.btnSend_MouseUp);
            // 
            // btnCancel
            // 
            this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
            this.btnCancel.Location = new System.Drawing.Point(0, -15);
            this.btnCancel.Name = "btnCancel";
            this.btnCancel.Size = new System.Drawing.Size(0, 15);
            this.btnCancel.TabIndex = 0;
            this.btnCancel.TabStop = false;
            this.btnCancel.Click += new System.EventHandler(this.btnCancel_Click);
            // 
            // lblPass
            // 
            this.lblPass.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.lblPass.Location = new System.Drawing.Point(16, 99);
            this.lblPass.Name = "lblPass";
            this.lblPass.Size = new System.Drawing.Size(39, 23);
            this.lblPass.TabIndex = 9;
            this.lblPass.Text = "&Pass:";
            // 
            // lblUser
            // 
            this.lblUser.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.lblUser.Location = new System.Drawing.Point(17, 55);
            this.lblUser.Name = "lblUser";
            this.lblUser.Size = new System.Drawing.Size(39, 23);
            this.lblUser.TabIndex = 5;
            this.lblUser.Text = "&User:";
            // 
            // btnSendUser
            // 
            this.btnSendUser.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
            this.btnSendUser.Image = ((System.Drawing.Image)(resources.GetObject("btnSendUser.Image")));
            this.btnSendUser.Location = new System.Drawing.Point(126, 55);
            this.btnSendUser.Name = "btnSendUser";
            this.btnSendUser.Size = new System.Drawing.Size(26, 23);
            this.btnSendUser.TabIndex = 7;
            this.btnSendUser.MouseMove += new System.Windows.Forms.MouseEventHandler(this.btnSendUser_MouseMove);
            this.btnSendUser.MouseDown += new System.Windows.Forms.MouseEventHandler(this.btnSendUser_MouseDown);
            this.btnSendUser.MouseUp += new System.Windows.Forms.MouseEventHandler(this.btnSendUser_MouseUp);
            // 
            // btnDNDUser
            // 
            this.btnDNDUser.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
            this.btnDNDUser.Image = ((System.Drawing.Image)(resources.GetObject("btnDNDUser.Image")));
            this.btnDNDUser.Location = new System.Drawing.Point(80, 55);
            this.btnDNDUser.Name = "btnDNDUser";
            this.btnDNDUser.Size = new System.Drawing.Size(26, 23);
            this.btnDNDUser.TabIndex = 6;
            this.btnDNDUser.MouseDown += new System.Windows.Forms.MouseEventHandler(this.btnDNDUser_MouseDown);
            // 
            // groupBox1
            // 
            this.groupBox1.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.groupBox1.Location = new System.Drawing.Point(10, -6);
            this.groupBox1.Name = "groupBox1";
            this.groupBox1.Size = new System.Drawing.Size(239, 51);
            this.groupBox1.TabIndex = 1;
            this.groupBox1.TabStop = false;
            // 
            // groupBox2
            // 
            this.groupBox2.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.groupBox2.Location = new System.Drawing.Point(10, 80);
            this.groupBox2.Name = "groupBox2";
            this.groupBox2.Size = new System.Drawing.Size(239, 51);
            this.groupBox2.TabIndex = 8;
            this.groupBox2.TabStop = false;
            // 
            // groupBox3
            // 
            this.groupBox3.FlatStyle = System.Windows.Forms.FlatStyle.System;
            this.groupBox3.Location = new System.Drawing.Point(10, 37);
            this.groupBox3.Name = "groupBox3";
            this.groupBox3.Size = new System.Drawing.Size(239, 51);
            this.groupBox3.TabIndex = 4;
            this.groupBox3.TabStop = false;
            // 
            // openFileImport
            // 
            this.openFileImport.Filter = "All Files|*.*";
            this.openFileImport.RestoreDirectory = true;
            this.openFileImport.Title = "File Import";
            // 
            // timer1
            // 
            this.timer1.Enabled = true;
            this.timer1.Interval = 60000;
            this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
            // 
            // PassInfoKeep
            // 
            this.AcceptButton = this.btnCancel;
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 15);
            this.CancelButton = this.btnCancel;
            this.ClientSize = new System.Drawing.Size(260, 172);
            this.Controls.Add(this.lblUser);
            this.Controls.Add(this.btnSendUser);
            this.Controls.Add(this.btnDNDUser);
            this.Controls.Add(this.lblPass);
            this.Controls.Add(this.btnCancel);
            this.Controls.Add(this.btnSend);
            this.Controls.Add(this.btnDND);
            this.Controls.Add(this.lblService);
            this.Controls.Add(this.cmbKeys);
            this.Controls.Add(this.btnExit);
            this.Controls.Add(this.groupBox1);
            this.Controls.Add(this.groupBox3);
            this.Controls.Add(this.groupBox2);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
            this.MaximizeBox = false;
            this.Menu = this.menuFile;
            this.Name = "PassInfoKeep";
            this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Hide;
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "PassInfoKeep";
            this.TopMost = true;
            this.Load += new System.EventHandler(this.PassInfoKeep_Load);
            this.Activated += new System.EventHandler(this.PassInfoKeep_Activated);
            this.Closing += new System.ComponentModel.CancelEventHandler(this.PassInfoKeep_Closing);
            this.Resize += new System.EventHandler(this.PassInfoKeep_Resize);
            this.ResumeLayout(false);

        }
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main(string[] args)
		{
			Application.EnableVisualStyles();
			notifyIcon = new NotifyIcon();
			notifyIcon.Icon = new Icon(Assembly.GetExecutingAssembly().GetManifestResourceStream("passkeep.trayicon.ico"), 16, 16);
			notifyIcon.Text = "PassInfoKeep";
			notifyIcon.Visible = true;
            bool startup = false;
            if(args.Length > 0 && args[0] == "/autostart")
                startup = true;
			PassInfoKeep mainForm = new PassInfoKeep(startup);
			mainForm.Icon = new Icon(Assembly.GetExecutingAssembly().GetManifestResourceStream("passkeep.trayicon.ico"), 16, 16);
			try
			{
                mainForm.ShowDialog();
			}
			finally
			{
				notifyIcon.Dispose();
			}
		}
		private void TrayClick(object sender, EventArgs e)
		{
			Visible = true;
			WindowState = FormWindowState.Normal;
			Activate();
		}		
		private void PassInfoKeep_Load(object sender, System.EventArgs e)
		{
            Application.AddMessageFilter(this);

			assemblyPath = Assembly.GetExecutingAssembly().Location;
			int pos = assemblyPath.LastIndexOf('\\');
            if(pos == -1)
				return;
			int len = assemblyPath.Length;
			assemblyPath = assemblyPath.Remove(pos + 1, len - pos -1);
			
			tipSend.SetToolTip(btnSendUser, "Drag over the target password field.\nThis will use SendMessage(WM_SETTEXT,...)");
			tipSend.SetToolTip(btnDNDUser, "Drag over the target password field.\nThis will use Drag and Drop operation");

			tipSend.SetToolTip(btnSend, "Drag over the target password field.\nThis will use SendMessage(WM_SETTEXT,...)");
			tipSend.SetToolTip(btnDND, "Drag over the target password field.\nThis will use Drag and Drop operation");

			notifyIcon.Click += new EventHandler(TrayClick);

			CheckPass dlg = new CheckPass();
			if(dlg.ShowDialog() == DialogResult.OK)
			{
                RegisterHotKey(Handle, 0x988B, 0x0002/*control*/, 0x7B/*F12*/);
				RijndaelManaged aes = new RijndaelManaged();
				TripleDESCryptoServiceProvider des3 = new TripleDESCryptoServiceProvider();

				encRij = aes.CreateEncryptor(dlg.KeyRij, dlg.IVRij);
				enc3des = des3.CreateEncryptor(dlg.Key3des, dlg.IV3des);
				decRij = aes.CreateDecryptor(dlg.KeyRij, dlg.IVRij);
				dec3des = des3.CreateDecryptor(dlg.Key3des, dlg.IV3des);
				des3.Clear();
				aes.Clear();
				dlg.Clear();
				
				FileIOPermission perm = new FileIOPermission(FileIOPermissionAccess.Read, assemblyPath + datafile);
				perm.Demand();

				if(File.Exists(assemblyPath + datafile))
				{
                    using (Stream fileStream = new FileStream(assemblyPath + datafile, FileMode.OpenOrCreate, FileAccess.Read, FileShare.None))
                    {
                        MemoryStream memStream = new MemoryStream();
                        byte[] buf = new byte[4096];
                        try
                        {
                            using (CryptoStream cryptStream = new CryptoStream(fileStream, decRij, CryptoStreamMode.Read))
                            {
                                int read = 0;

                                while (true)
                                {
                                    read = cryptStream.Read(buf, 0, buf.Length);
                                    if (read == 0)
                                        break;
                                    memStream.Write(buf, 0, read);
                                }
                                cryptStream.Clear();
                            }
                            memStream.Position = 0;
                            using (XmlTextReader xmlr = new XmlTextReader(memStream))
                            {

                                while (xmlr.Read())
                                {
                                    if (xmlr.NodeType == XmlNodeType.Element && xmlr.LocalName == "Entry")
                                    {
                                        UserData data = new UserData();
                                        data.user = xmlr.GetAttribute("user");
                                        data.pass = xmlr.GetAttribute("data");
                                        id2pass[xmlr.GetAttribute("id")] = data;
                                    }
                                }
                                buf = memStream.GetBuffer();
                                Array.Clear(buf, 0, (int)memStream.Length);
                            }
                            memStream.Close();
                        }
                        catch (Exception)
                        {
                            MessageBox.Show("Unable to decrypt", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                            Close();
                        }
                        finally
                        {
                            fileStream.Close();
                        }
                    }
				}
				foreach (DictionaryEntry entry in id2pass)
					cmbKeys.Items.Add(entry.Key);
				if (cmbKeys.Items.Count > 0)
					cmbKeys.SelectedIndex = 0;
			}
			else
			{
				Close();
			}
		}
		protected override void WndProc(ref Message m)
		{
			if (m.Msg == 0x0312) //WM_HOTKEY
			{
				Visible = true;
				WindowState = FormWindowState.Normal;
				Activate();
			}
			base.WndProc(ref m);
		}
		private void btnExit_Click(object sender, System.EventArgs e)
		{
			Close();
		}		
		private void btnCancel_Click(object sender, System.EventArgs e)
		{
			WindowState = FormWindowState.Minimized;
			Visible = false;
		}
        private void menuFileAdd_Click(object sender, System.EventArgs e)
        {
            AddNew dlg = new AddNew();
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                UserData data = new UserData();
                data.user = EncryptAndBase64(dlg.User, enc3des);
                data.pass = EncryptAndBase64(dlg.Password, enc3des);

                id2pass[dlg.TxtID] = data;

                if (!cmbKeys.Items.Contains(dlg.TxtID))
                {
                    int itemIndex = cmbKeys.Items.Add(dlg.TxtID);

                    if (cmbKeys.SelectedIndex == -1)
                        cmbKeys.SelectedIndex = itemIndex;
                }

                using (MemoryStream memStream = new MemoryStream())
                {
                    using (XmlTextWriter xmlw = XmlWriteSettings(memStream))
                    {

                        int memLen = EncryptSaveStream(memStream);

                        byte[] buf = memStream.GetBuffer();
                        Array.Clear(buf, 0, memLen);
                        dlg.Clear();
                    }
                }
            }
        }
		private void menuDelete_Click(object sender, System.EventArgs e)
		{
            if(MessageBox.Show("Continue?", "Question", MessageBoxButtons.YesNo, MessageBoxIcon.Question) != DialogResult.Yes)
                return;
			int itemIndex = cmbKeys.SelectedIndex;
			if(itemIndex >= 0)
			{
				id2pass.Remove(cmbKeys.Items[itemIndex]);
				cmbKeys.Items.RemoveAt(itemIndex);
			}
			if(cmbKeys.Items.Count > 0)
				cmbKeys.SelectedIndex = 0;

            using (MemoryStream memStream = new MemoryStream())
            {
                using (XmlTextWriter xmlw = XmlWriteSettings(memStream))
                {
                    int memLen = EncryptSaveStream(memStream);

                    byte[] buf = memStream.GetBuffer();
                    Array.Clear(buf, 0, memLen);
                }
            }
		}
		private void btnDND_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			int itemIndex = cmbKeys.SelectedIndex;
			if (itemIndex >= 0)
			{
				object obj = id2pass[cmbKeys.Items[itemIndex]];
				Debug.Assert(obj != null && obj is UserData);
				
                string pass = (string)DecryptFromBase64(((UserData)obj).pass, dec3des);

				DoDragDrop(pass, DragDropEffects.Copy);
                CheckPass.ClearString(pass);
			}
		}		
		private void btnDNDUser_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			int itemIndex = cmbKeys.SelectedIndex;
			if (itemIndex >= 0)
			{
				object obj = id2pass[cmbKeys.Items[itemIndex]];
				Debug.Assert(obj != null && obj is UserData);

				string user = (string)DecryptFromBase64(((UserData)obj).user, dec3des);
				
                DoDragDrop(user, DragDropEffects.Copy);
                CheckPass.ClearString(user);
			}
		}
		private void btnSend_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			if(cmbKeys.SelectedIndex < 0)
				return;
			cursorCurrent = Cursor;
			Cursor = Cursors.Hand;
			btnSend.Capture = true;
		}

		private void btnSendUser_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			if(cmbKeys.SelectedIndex < 0)
				return;
			cursorCurrent = Cursor;
			Cursor = Cursors.Hand;
			btnSendUser.Capture = true;
		}
        private void btnSendUser_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if(!btnSendUser.Capture)
                return;
            FrameTargetWnd();
        }
        private void btnSend_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            if(!btnSend.Capture)
                return;
            FrameTargetWnd();
        }
        private void btnSend_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			btnSend.Capture = false;
			Cursor = cursorCurrent;
            if(previousRect.Height > 0 || previousRect.Width > 0)
            {
                ControlPaint.DrawReversibleFrame(previousRect, drawFrameBkColorPrev, FrameStyle.Dashed);
                ControlPaint.DrawReversibleFrame(previousRect2, drawFrameBkColorPrev, FrameStyle.Dashed);
                previousRect.Size = new Size(0, 0);
            }
            SendUserPassToWnd(true);
		}
        private void btnSendUser_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            btnSendUser.Capture = false;
            Cursor = cursorCurrent;
            if(previousRect.Height > 0 || previousRect.Width > 0)
            {
                ControlPaint.DrawReversibleFrame(previousRect, drawFrameBkColorPrev, FrameStyle.Dashed);
                ControlPaint.DrawReversibleFrame(previousRect2, drawFrameBkColorPrev, FrameStyle.Dashed);
                previousRect.Size = new Size(0, 0);
            }
            SendUserPassToWnd(false);
        }
        private void PassInfoKeep_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            Clear();
            HandleRef href = new HandleRef(this, Handle);
            UnregisterHotKey(Handle, 0x988B);
        }
        private void PassInfoKeep_Resize(object sender, System.EventArgs e)
        {
            if(WindowState == FormWindowState.Minimized)
                Visible = false;
        }
        private XmlTextWriter XmlWriteSettings(MemoryStream memStream)
        {
            XmlTextWriter xmlw = new XmlTextWriter(memStream, null);

            xmlw.WriteStartElement("Entries");
            foreach (DictionaryEntry entry in id2pass)
            {
                UserData data =  (UserData)entry.Value;
                xmlw.WriteStartElement("Entry");
                xmlw.WriteAttributeString("id", (string)entry.Key);
                xmlw.WriteAttributeString("user", data.user);
                xmlw.WriteAttributeString("data", data.pass);
                xmlw.WriteEndElement();
            }

            xmlw.WriteEndElement();
            xmlw.Flush();
            memStream.Position = 0;
            return xmlw;
        }
        private int EncryptSaveStream(MemoryStream memStream)
        {
            int retLen = 0;
            if(File.Exists(assemblyPath + datafile))
                File.Copy(assemblyPath + datafile, assemblyPath + datafile + ".bak", true);

            FileIOPermission perm = new FileIOPermission(FileIOPermissionAccess.Write, assemblyPath + datafile);
            perm.Demand();
            using (Stream fileStream = new FileStream(assemblyPath + datafile, FileMode.Create, FileAccess.Write, FileShare.None))
            {
                using (CryptoStream cryptStream = new CryptoStream(memStream, encRij, CryptoStreamMode.Read))
                {

                    int read = 0;

                    byte[] buf = new byte[4096];
                    while (true)
                    {
                        read = cryptStream.Read(buf, 0, buf.Length);
                        if (read == 0)
                            break;
                        fileStream.Write(buf, 0, read);
                    }
                    retLen = (int)memStream.Length;
                    cryptStream.Clear();
                }
            }
            return retLen;
        }
        private void SendUserPassToWnd(bool ispass)
        {
            Point pt = Cursor.Position;
            IntPtr hWnd = FindTargetWindow(pt);
            if(hWnd != this.Handle && hWnd.ToInt64() != 0)
            {
                int itemIndex = cmbKeys.SelectedIndex;
                if (itemIndex >= 0)
                {
                    object obj = id2pass[cmbKeys.Items[itemIndex]];
                    Debug.Assert(obj != null && obj is UserData);
                    string val = "";
                    if(ispass)
                       val = (string)DecryptFromBase64(((UserData)obj).pass, dec3des);
                    else
                       val = (string)DecryptFromBase64(((UserData)obj).user, dec3des);

                    IntPtr ptr = Marshal.StringToCoTaskMemAuto(val);
                    int valLen = val.Length;
                    CheckPass.ClearString(val);
                    SendMessage(hWnd, 0x000C, 0, ptr.ToInt32());
                    CheckPass.ClearString(ptr, valLen*Marshal.SystemDefaultCharSize);
                    Marshal.FreeCoTaskMem(ptr);
                }
            }
        }
		private IntPtr FindTargetWindow(Point pt)
		{
			SeqPoint seqpt = new SeqPoint();
			seqpt.x = pt.X;
			seqpt.y = pt.Y;
			IntPtr hWnd = WindowFromPoint(seqpt);

			if(Bounds.Contains(pt))
				return this.Handle;

			if (hWnd.ToInt64() != 0)
			{
				IntPtr hParent = GetParent(hWnd);
				if(hParent.ToInt64() != 0 && ScreenToClient(hParent, ref seqpt))
				{
					hParent = RealChildWindowFromPoint(hParent, seqpt);
					if(hParent.ToInt64() != 0)
						hWnd = hParent;
				}
			}
			return hWnd;
		}
        private string EncryptAndBase64(string val, ICryptoTransform trans)
        {
            byte[] buf = UnicodeEncoding.Unicode.GetBytes(val);

            using (MemoryStream memStream = new MemoryStream())
            {
                using (CryptoStream cryptStream = new CryptoStream(memStream, trans, CryptoStreamMode.Write))
                {

                    cryptStream.Write(buf, 0, buf.Length);
                    cryptStream.FlushFinalBlock();
                    Array.Clear(buf, 0, buf.Length);

                    buf = memStream.GetBuffer();
                    val = Convert.ToBase64String(buf, 0, (int)memStream.Length);
                    Array.Clear(buf, 0, (int)memStream.Length);

                    cryptStream.Clear();
                    return val;
                }
            }
        }

		private string DecryptFromBase64(string base64str, ICryptoTransform trans)
		{
			byte[] buf = Convert.FromBase64String(base64str);
            using (MemoryStream memStream = new MemoryStream())
            {
                using (CryptoStream cryptStream = new CryptoStream(memStream, trans, CryptoStreamMode.Write))
                {
                    cryptStream.Write(buf, 0, buf.Length);
                    cryptStream.FlushFinalBlock();
                    Array.Clear(buf, 0, buf.Length);
                    buf = memStream.GetBuffer();

                    string ret = UnicodeEncoding.Unicode.GetString(buf, 0, (int)memStream.Length);
                    Array.Clear(buf, 0, (int)memStream.Length);
                    cryptStream.Clear();
                    return ret;
                }
            }
		}
        private void menuImport_Click(object sender, System.EventArgs e)
        {
            CheckPass dlg = new CheckPass();
            if(dlg.ShowDialog() != DialogResult.OK)
                return;
            
            SymmetricAlgorithm alg = new RijndaelManaged();
            ICryptoTransform rij = alg.CreateDecryptor(dlg.KeyRij, dlg.IVRij);
            alg.Clear();

            alg = new TripleDESCryptoServiceProvider();
            ICryptoTransform des3 = alg.CreateDecryptor(dlg.Key3des, dlg.IV3des);
            alg.Clear();
                       
            dlg.Clear();

            if(openFileImport.ShowDialog() == DialogResult.OK)
            {
                using (Stream fileStream = openFileImport.OpenFile())
                {
                    try
                    {
                        byte[] buf = new byte[4096];
                        MemoryStream memStream = new MemoryStream((int)fileStream.Length);
                        using (CryptoStream cryptoStream = new CryptoStream(fileStream, rij, CryptoStreamMode.Read))
                        {
                            int read = 0;
                            while (true)
                            {
                                read = cryptoStream.Read(buf, 0, buf.Length);
                                if (read == 0)
                                    break;
                                memStream.Write(buf, 0, read);
                            }
                            cryptoStream.Clear();
                            fileStream.Close();
                            memStream.Position = 0;
                        }

                        XmlTextReader xmlr = new XmlTextReader(memStream);

                        HybridDictionary tmpTable = new HybridDictionary();
                        while (xmlr.Read())
                        {
                            if (xmlr.NodeType == XmlNodeType.Element && xmlr.LocalName == "Entry")
                            {
                                UserData data = new UserData();

                                string val = xmlr.GetAttribute("user");
                                val = (string)DecryptFromBase64(val, des3);
                                data.user = EncryptAndBase64(val, enc3des);
                                CheckPass.ClearString(val);

                                val = xmlr.GetAttribute("data");
                                val = (string)DecryptFromBase64(val, des3);
                                data.pass = EncryptAndBase64(val, enc3des);
                                CheckPass.ClearString(val);

                                tmpTable[xmlr.GetAttribute("id")] = data;
                            }
                        }
                        buf = memStream.GetBuffer();
                        Array.Clear(buf, 0, (int)memStream.Length);
                        xmlr.Close();
                        memStream.Close();

                        foreach (DictionaryEntry entry in tmpTable)
                        {
                            id2pass[entry.Key] = entry.Value;
                            if (!cmbKeys.Items.Contains(entry.Key))
                                cmbKeys.Items.Add(entry.Key);
                        }
                        if (cmbKeys.Items.Count > 0 && cmbKeys.SelectedIndex == -1)
                            cmbKeys.SelectedIndex = 0;

                        tmpTable.Clear();

                        using (memStream = new MemoryStream())
                        {
                            using (XmlTextWriter xmlw = XmlWriteSettings(memStream))
                            {

                                memStream.Position = 0;
                                int memLen = EncryptSaveStream(memStream);

                                buf = memStream.GetBuffer();
                                Array.Clear(buf, 0, memLen);
                            }
                        }
                    }
                    catch (Exception)
                    {
                        MessageBox.Show("Unable to import", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                    finally
                    {
                        rij.Dispose();
                        des3.Dispose();
                    }
                }
            }
        }
        private void Clear()
        {
            if (encRij != null)
            {
                encRij.Dispose();
                encRij = null;
            }
            if (enc3des != null)
            {
                enc3des.Dispose();
                enc3des = null;
            }
            if (decRij != null)
            {
                decRij.Dispose();
                decRij = null;
            }
            if (dec3des != null)
            {
                dec3des.Dispose();
                dec3des = null;
            }
        }
        private void menuAbout_Click(object sender, System.EventArgs e)
        {
            About dlg = new About();
            dlg.ShowDialog();
        }

        private void PassInfoKeep_Activated(object sender, System.EventArgs e)
        {
            if (startupMode)
            {
                WindowState = FormWindowState.Minimized;
                Visible = false;
                startupMode = false;
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            int totalMs = (int)((DateTime.UtcNow - _lastUsed).TotalMilliseconds);
            if (totalMs < timer1.Interval)
                return;

            if (!timer1.Enabled)
                return;
            timer1.Enabled = false;

            List<Form> forms = new List<Form>();
            foreach (Form form in Application.OpenForms)
                forms.Add(form);
            foreach (Form form in forms)
                form.Close();
            base.Close();
        }

        private void FrameTargetWnd()
        {
            Point pt = Cursor.Position;
            IntPtr hWnd = FindTargetWindow(pt);
            if (hWnd.ToInt64() != 0)
            {
                SeqRect rc;
                if (GetWindowRect(hWnd, out rc))
                {
                    Rectangle rect = new Rectangle(rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top);
                    if (rect != previousRect)
                    {
                        Graphics g = Graphics.FromHwnd(hWnd);
                        IntPtr hDC = g.GetHdc();
                        if (hDC.ToInt64() != 0)
                        {
                            try
                            {
                                if (previousRect.Height > 0 || previousRect.Width > 0)
                                {
                                    ControlPaint.DrawReversibleFrame(previousRect, drawFrameBkColorPrev, FrameStyle.Dashed);
                                    ControlPaint.DrawReversibleFrame(previousRect2, drawFrameBkColorPrev, FrameStyle.Dashed);
                                }
                                if (hWnd != this.Handle)
                                {
                                    drawFrameBkColor = Color.FromArgb(GetBkColor(hDC));
                                    ControlPaint.DrawReversibleFrame(rect, drawFrameBkColor, FrameStyle.Dashed);
                                    previousRect = rect;
                                    rect.Offset(1, 1);
                                    rect.Height -= 2;
                                    rect.Width -= 2;
                                    ControlPaint.DrawReversibleFrame(rect, drawFrameBkColor, FrameStyle.Dashed);
                                    previousRect2 = rect;
                                    drawFrameBkColorPrev = drawFrameBkColor;
                                }
                                else
                                    previousRect.Size = new Size(0, 0);
                            }
                            finally
                            {
                                g.ReleaseHdc(hDC);
                                g.Dispose();
                            }
                        }
                    }
                }
            }
        }

        #region IMessageFilter Members

        public bool PreFilterMessage(ref Message m)
        {
            if ((m.Msg >= 0x0100 && m.Msg <= 0x0109) || (m.Msg >= 0x0200 && m.Msg <= 0x020E))
            {
                _lastUsed = DateTime.UtcNow;
            }

            return false;
        }

        #endregion
    }
}