Crypto-Notepad/Crypto Notepad/MainForm.cs

using IWshRuntimeLibrary;
using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Net;
using System.Reflection;
using System.Security.Cryptography;
using System.Threading;
using System.Windows.Forms;
using File = System.IO.File;

namespace Crypto_Notepad
{
    public partial class MainForm : Form
    {
        Properties.Settings ps = Properties.Settings.Default;
        string filePath = "";
        string[] args = Environment.GetCommandLineArgs();
        int caretPos = 0;
        string appName = Assembly.GetExecutingAssembly().GetName().Name + " – ";
        string currentFilename = "";
        bool shiftPresed;
        bool cancelPressed = false;
        bool noExit = false;
        string argsPath = "";
        public MainForm()
        {
            InitializeComponent();
            customRTB.DragDrop += new DragEventHandler(customRTB_DragDrop);
            customRTB.AllowDrop = true;
        }

        void DecryptAES()
        {
            EnterKeyForm f2 = new EnterKeyForm();
            f2.ShowDialog();
            if (PublicVar.okPressed == false)
            {
                return;
            }
            if (panel1.Visible == true)
            {
                findToolStripMenuItem2_Click(this, new EventArgs());
            }
            try
            {
                string opnfile = File.ReadAllText(OpenFile.FileName);
                string NameWithotPath = Path.GetFileName(OpenFile.FileName);

                string de = AES.Decrypt(opnfile, TypedPassword.Value, ps.TheSalt, ps.HashAlgorithm, ps.PasswordIterations, ps.KeySize);
                customRTB.Text = de;

                this.Text = appName + NameWithotPath;
                filePath = OpenFile.FileName;
                string cc2 = customRTB.Text.Length.ToString(CultureInfo.InvariantCulture);
                customRTB.Select(Convert.ToInt32(cc2), 0);

                PublicVar.openFileName = Path.GetFileName(OpenFile.FileName);
                currentFilename = Path.GetFileName(OpenFile.FileName);
                PublicVar.encryptionKey.Set(TypedPassword.Value);
                TypedPassword.Value = null;
            }
            catch (CryptographicException)
            {
                using (new CenterWinDialog(this))
                {
                    TypedPassword.Value = null;
                    DialogResult dialogResult = MessageBox.Show("Invalid key!", "Crypto Notepad", MessageBoxButtons.RetryCancel, MessageBoxIcon.Error);
                    if (dialogResult == DialogResult.Retry)
                    {
                        DecryptAES();
                    }
                    if (dialogResult == DialogResult.Cancel)
                    {
                        return;
                    }
                }
            }
        }

        private void openToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OpenFile.FileName = "";
            saveConfirm(false);
            if (cancelPressed == true)
            {
                cancelPressed = false;
                return;
            }

            if (OpenFile.ShowDialog() != DialogResult.OK) return;
            {
                PublicVar.openFileName = Path.GetFileName(OpenFile.FileName);
                if (!OpenFile.FileName.Contains(".cnp"))
                {
                    string opnfile = File.ReadAllText(OpenFile.FileName);
                    string NameWithotPath = Path.GetFileName(OpenFile.FileName);
                    customRTB.Text = opnfile;
                    this.Text = appName + NameWithotPath;
                    string cc2 = customRTB.Text.Length.ToString(CultureInfo.InvariantCulture);
                    customRTB.Select(Convert.ToInt32(cc2), 0);
                    return;
                }
                DecryptAES();

                #region workaround, strange behavior with the cursor in customRTB fix
                customRTB.DetectUrls = false;
                customRTB.DetectUrls = true;
                customRTB.Modified = false;
                #endregion

                if (PublicVar.okPressed == true)
                {
                    PublicVar.okPressed = false;
                }
            }
        }

        private void openAsotiations()
        {
            EnterKeyForm Form2 = new EnterKeyForm();
            Form2.StartPosition = FormStartPosition.CenterScreen;
            string fileExtension = Path.GetExtension(args[1]);

            if (fileExtension == ".cnp")
            {
                try
                {
                    string NameWithotPath = Path.GetFileName(args[1]);
                    string opnfile = File.ReadAllText(args[1]);

                    Form2.ShowDialog();
                    if (PublicVar.okPressed == false)
                    {
                        OpenFile.FileName = "";
                        return;
                    }
                    PublicVar.okPressed = false;

                    string de = AES.Decrypt(opnfile, TypedPassword.Value, ps.TheSalt, ps.HashAlgorithm, ps.PasswordIterations, ps.KeySize);
                    customRTB.Text = de;

                    this.Text = appName + NameWithotPath;

                    filePath = args[1];
                    string cc = customRTB.Text.Length.ToString(CultureInfo.InvariantCulture);
                    PublicVar.encryptionKey.Set(TypedPassword.Value);
                    customRTB.Select(Convert.ToInt32(cc), 0);
                    TypedPassword.Value = null;
                }
                catch (CryptographicException)
                {
                    TypedPassword.Value = null;
                    DialogResult dialogResult = MessageBox.Show("Invalid key!", "Crypto Notepad", MessageBoxButtons.RetryCancel, MessageBoxIcon.Error);
                    if (dialogResult == DialogResult.Retry)
                    {
                        openAsotiations();
                    }
                }

            }
            else
            {
                string opnfile = File.ReadAllText(args[1]);
                string NameWithotPath = Path.GetFileName(args[1]);
                customRTB.Text = opnfile;
                this.Text = appName + NameWithotPath;
                string cc2 = customRTB.Text.Length.ToString(CultureInfo.InvariantCulture);
                customRTB.Select(Convert.ToInt32(cc2), 0);
            }

            currentFilename = Path.GetFileName(args[1]);
        }

        private void sendTo()
        {
            EnterKeyForm f2 = new EnterKeyForm();
            f2.StartPosition = FormStartPosition.CenterScreen;
            string fileExtension = Path.GetExtension(argsPath);

            if (fileExtension == ".cnp")
            {
                try
                {
                    string NameWithotPath = Path.GetFileName(argsPath);
                    string opnfile = File.ReadAllText(argsPath);

                    f2.ShowDialog();
                    if (PublicVar.okPressed == false)
                    {
                        OpenFile.FileName = "";
                        return;
                    }
                    PublicVar.okPressed = false;
                    string de = AES.Decrypt(opnfile, TypedPassword.Value, ps.TheSalt, ps.HashAlgorithm, ps.PasswordIterations, ps.KeySize);
                    customRTB.Text = de;

                    this.Text = appName + NameWithotPath;

                    filePath = argsPath;
                    string cc = customRTB.Text.Length.ToString(CultureInfo.InvariantCulture);
                    customRTB.Select(Convert.ToInt32(cc), 0);
                    PublicVar.encryptionKey.Set(TypedPassword.Value);
                    currentFilename = Path.GetFileName(argsPath);
                    TypedPassword.Value = null;
                }
                catch (CryptographicException)
                {
                    TypedPassword.Value = null;
                    DialogResult dialogResult = MessageBox.Show("Invalid key!", "Crypto Notepad", MessageBoxButtons.RetryCancel, MessageBoxIcon.Error);
                    if (dialogResult == DialogResult.Retry)
                    {
                        sendTo();
                    }
                }

            }
            else
            {
                string opnfile = File.ReadAllText(argsPath);
                string NameWithotPath = Path.GetFileName(argsPath);
                customRTB.Text = opnfile;
                this.Text = appName + NameWithotPath;
                string cc2 = customRTB.Text.Length.ToString(CultureInfo.InvariantCulture);
                customRTB.Select(Convert.ToInt32(cc2), 0);
            }
        }

        private void newToolStripMenuItem_Click_1(object sender, EventArgs e)
        {
            saveConfirm(false);
            SaveFile.FileName = "Unnamed.cnp";
            PublicVar.openFileName = "Crypto Notepad";
            EnterKeyForm f2 = new EnterKeyForm();
            f2.ShowDialog();
            PublicVar.encryptionKey.Set(TypedPassword.Value);
            if (PublicVar.okPressed == false)
            {
                TypedPassword.Value = null;
                return;
            }

            if (PublicVar.okPressed == true)
            {
                PublicVar.okPressed = false;
                if (SaveFile.ShowDialog() != DialogResult.OK)
                {
                    TypedPassword.Value = null;
                    return;
                }

                customRTB.Clear();
                StreamWriter sw = new StreamWriter(SaveFile.FileName);
                string NameWithotPath = Path.GetFileName(SaveFile.FileName);
                this.Text = appName + NameWithotPath;
                filePath = SaveFile.FileName;
                currentFilename = Path.GetFileName(SaveFile.FileName);
                sw.Close();
            }
            TypedPassword.Value = null;
        }

        private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            int saveCaret = customRTB.SelectionStart;
            string NameWithotPath = Path.GetFileName(OpenFile.FileName);
            SaveFile.FileName = currentFilename;
            EnterKeyForm f2 = new EnterKeyForm();

            if (string.IsNullOrEmpty(PublicVar.encryptionKey.Get()))
            {             
                f2.ShowDialog();
                if (PublicVar.okPressed == false)
                {
                    return;
                }
                PublicVar.okPressed = false;
            }

            if (SaveFile.ShowDialog() != DialogResult.OK)
            {
                return;
            }

            if (TypedPassword.Value == null)
            {
                TypedPassword.Value = PublicVar.encryptionKey.Get();
            }

            filePath = SaveFile.FileName;
            string noenc = customRTB.Text;
            string en;
            if (PublicVar.randomizeSalts)
            {
                en = AES.Encrypt(customRTB.Text, TypedPassword.Value, null, ps.HashAlgorithm, ps.PasswordIterations, ps.KeySize);
            }
            else
            {
                en = AES.Encrypt(customRTB.Text, TypedPassword.Value, ps.TheSalt, ps.HashAlgorithm, ps.PasswordIterations, ps.KeySize);
            }

            customRTB.Text = en;
            StreamWriter sw = new StreamWriter(filePath);
            int i = customRTB.Lines.Count();
            int j = 0;
            i = i - 1;
            while (j <= i)
            {
                sw.WriteLine(customRTB.Lines.GetValue(j).ToString());
                j = j + 1;
            }
            sw.Close();
            customRTB.Text = noenc;
            this.Text = appName + Path.GetFileName(filePath);
            customRTB.Select(Convert.ToInt32(saveCaret), 0);
            PublicVar.encryptionKey.Set(TypedPassword.Value);
            TypedPassword.Value = null;
            currentFilename = Path.GetFileName(SaveFile.FileName);
        }

        private void MainWindow_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (this.WindowState == FormWindowState.Normal)
            {
                ps.WindowSize = this.Size;
                ps.WindowLocation = this.Location;
                ps.WindowState = this.WindowState;
            }

            if (this.WindowState == FormWindowState.Maximized)
            {
                ps.WindowState = this.WindowState;
            }

            ps.Save();

            saveConfirm(true);

            if (noExit == true)
            {
                e.Cancel = true;
            }
        }

        #region Send to Shortcut
        public static void SendToShortcut()
        {
            string shortcutPath = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + @"\Microsoft\Windows\SendTo";
            string shortcutName = "Crypto Notepad" + ".lnk";
            string shortcutLocation = Path.Combine(shortcutPath, shortcutName);
            string targetFileLocation = Assembly.GetEntryAssembly().Location;

            WshShell shell = new WshShell();
            IWshShortcut shortcut = (IWshShortcut)shell.CreateShortcut(shortcutLocation);
            shortcut.Description = "Crypto Notepad";
            shortcut.IconLocation = targetFileLocation;
            shortcut.TargetPath = targetFileLocation;
            shortcut.Arguments = "/s";
            shortcut.Save();                                   
        }
        #endregion

        private void MainWindow_Load(object sender, EventArgs e)
        {
            string pos = ps.WindowLocation.ToString();

            customRTB.Font = new Font(ps.RichTextFont, ps.RichTextSize);
            customRTB.ForeColor = ps.RichForeColor;
            customRTB.BackColor = ps.RichBackColor;
            this.BackColor = ps.RichBackColor;
            wordWrapToolStripMenuItem.Checked = ps.MenuWrap;
            customRTB.WordWrap = ps.RichWrap;
            panel2.Visible = ps.ShowToolbar;

            if (!ps.ShowToolbar)
            {
                panel2.Visible = false;
                int h = customRTB.Height;
                h += 23;
                customRTB.Height = h;
                customRTB.Location = new Point(6, 29);
            }

            if (ps.ShowToolbar)
            {
                panel2.Visible = true;
            }

            if (ps.AutoCheckUpdate)
            {
                Thread up = new Thread(() => сheckForUpdates(false));
                up.Start();
            }

            DeleteUpdateFiles();

            if (args.Contains("/s")) /*send to*/
            {
                foreach (var arg in args)
                {
                    argsPath = arg;
                }
                sendTo();
            }

            if (args.Contains("/o"))  /*decrypt & open cnp*/
            {
                openAsotiations();
            }

            if (args.Contains("/e")) /*encrypt*/
            {
                ContextMenuEncrypt();
            }

            if (args.Contains("/er")) /*encrypt and replace*/
            {
                ContextMenuEncryptReplace();
            }


            if (pos != "{X=0,Y=0}")
            {
                this.Location = ps.WindowLocation;
            }

            this.Size = ps.WindowSize;
            this.WindowState = ps.WindowState;
        }

        public void ContextMenuEncryptReplace()
        {
            PublicVar.openFileName = Path.GetFileName(args[1]);
            DialogResult res = new DialogResult();

            if (args[1].Contains(".cnp"))
            {
                MessageBox.Show("Looks like this file is already encrypted", "Crypto Notepad", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            res = MessageBox.Show("This action will delete the source file and replace it with encrypted version", "Crypto Notepad", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);

            if (res == DialogResult.Cancel)
            {
                Environment.Exit(0);
            }

            if (!args[1].Contains(".cnp"))
            {
                string opnfile = File.ReadAllText(args[1]);
                customRTB.Text = opnfile;
                string cc2 = customRTB.Text.Length.ToString(CultureInfo.InvariantCulture);
                customRTB.Select(Convert.ToInt32(cc2), 0);
                currentFilename = Path.GetFileName(args[1]);
                string newFile = Path.GetDirectoryName(args[1]) + @"\" + Path.GetFileNameWithoutExtension(args[1]) + ".cnp";

                EnterKeyForm f2 = new EnterKeyForm();
                f2.ShowDialog();
                if (PublicVar.okPressed == false)
                {
                    Application.Exit();
                }
                PublicVar.okPressed = false;

                File.Delete(args[1]);

                string noenc = customRTB.Text;
                string en;
                en = AES.Encrypt(customRTB.Text, TypedPassword.Value, null, ps.HashAlgorithm, ps.PasswordIterations, ps.KeySize);
                customRTB.Text = en;
                StreamWriter sw = new StreamWriter(newFile);
                int i = customRTB.Lines.Count();
                int j = 0;
                i = i - 1;
                while (j <= i)
                {
                    sw.WriteLine(customRTB.Lines.GetValue(j).ToString());
                    j = j + 1;
                }
                sw.Close();
                PublicVar.encryptionKey.Set(TypedPassword.Value);
                TypedPassword.Value = null;
                filePath = newFile;
                currentFilename = Path.GetFileName(newFile);
                this.Text = appName + currentFilename;
                customRTB.Text = noenc;
            }

            #region workaround, strange behavior with the cursor in customRTB fix
            customRTB.DetectUrls = false;
            customRTB.DetectUrls = true;
            customRTB.Modified = false;
            #endregion

            if (PublicVar.okPressed == true)
            {
                PublicVar.okPressed = false;
            }
        }

        public void ContextMenuEncrypt()
        {
            PublicVar.openFileName = Path.GetFileName(args[1]);
            if (!args[1].Contains(".cnp"))
            {
                string opnfile = File.ReadAllText(args[1]);
                string NameWithotPath = Path.GetFileName(args[1]);
                customRTB.Text = opnfile;
                this.Text = appName + NameWithotPath;
                string cc2 = customRTB.Text.Length.ToString(CultureInfo.InvariantCulture);
                customRTB.Select(Convert.ToInt32(cc2), 0);
                currentFilename = Path.GetFileName(args[1]);
                filePath = OpenFile.FileName;
            }

            #region workaround, strange behavior with the cursor in customRTB fix
            customRTB.DetectUrls = false;
            customRTB.DetectUrls = true;
            customRTB.Modified = false;
            #endregion

            if (PublicVar.okPressed == true)
            {
                PublicVar.okPressed = false;
            }
        }

        public void DeleteUpdateFiles()
        {
            string exePath = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location) + @"\";
            string UpdaterExe = exePath + "Updater.exe";
            string UpdateZip = exePath + "Crypto-Notepad-Update.zip";
            string ZipDll = exePath + "Ionic.Zip.dll";

            if (File.Exists(UpdaterExe))
            {
                File.Delete(UpdaterExe);
            }

            if (File.Exists(UpdateZip))
            {
                File.Delete(UpdateZip);
            }

            if (File.Exists(ZipDll))
            {
                File.Delete(ZipDll);
            }
        }

        private void clearToolStripMenuItem_Click(object sender, EventArgs e)
        {
            customRTB.Clear();
        }

        private void saveToolStripMenuItem1_Click_1(object sender, EventArgs e)
        {
            string noname = "Unnamed.cnp";
            string NameWithotPath = Path.GetFileName(OpenFile.FileName);
            int saveCaret = customRTB.SelectionStart;

            if (PublicVar.encryptionKey.Get() == null)
            {
                SaveFile.FileName = noname;
                saveAsToolStripMenuItem_Click(this, new EventArgs());

                if (PublicVar.okPressed == false)
                {
                    return;
                }

                PublicVar.okPressed = false;
            }

            string noenc = customRTB.Text;
            string en;
            if (PublicVar.randomizeSalts)
            {
                en = AES.Encrypt(customRTB.Text, PublicVar.encryptionKey.Get(), null, ps.HashAlgorithm, ps.PasswordIterations, ps.KeySize);
            }
            else
            {
                en = AES.Encrypt(customRTB.Text, PublicVar.encryptionKey.Get(), ps.TheSalt, ps.HashAlgorithm, ps.PasswordIterations, ps.KeySize);
            }

            customRTB.Text = en;
            StreamWriter sw = new StreamWriter(filePath);
            int i = customRTB.Lines.Count();
            int j = 0;
            i = i - 1;

            while (j <= i)
            {
                sw.WriteLine(customRTB.Lines.GetValue(j).ToString());
                j = j + 1;
            }

            sw.Close();
            customRTB.Text = noenc;
            customRTB.Select(Convert.ToInt32(saveCaret), 0);
            PublicVar.keyChanged = false;
        }

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void selectAllToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (customRTB.Focused == true)
            {
                customRTB.SelectAll();
            }
            else
            {
                searchTextBox.SelectAll();
            }
        }

        private void cutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (customRTB.Focused == true)
            {
                customRTB.Cut();
            }
            else
            {
                searchTextBox.Cut();
            }
        }

        private void copyToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (customRTB.Focused == true)
            {
                customRTB.Copy();
            }
            else
            {
                searchTextBox.Copy();
            }
        }

        private void pasteToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (customRTB.Focused == true)
            {
                customRTB.Paste(DataFormats.GetFormat(DataFormats.Text));
            }
            else
            {
                searchTextBox.Paste();
            }
        }

        private void deleteFileToolStripMenuItem_Click_1(object sender, EventArgs e)
        {
            if (filePath != "")
            {
                using (new CenterWinDialog(this))
                {
                    if (MessageBox.Show("Delete file: " + "\"" + filePath + "\"" + " ?", "Crypto Notepad", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                    {
                        File.Delete(filePath);
                        customRTB.Clear();
                        PublicVar.encryptionKey.Set(null);
                        pictureBox6.Enabled = false;
                        pictureBox7.Enabled = false;
                        pictureBox11.Enabled = false;
                        pictureBox13.Enabled = false;
                        filePath = "";
                        currentFilename =  "Unnamed.cnp";
                        this.Text = appName.Remove(14);
                        return;
                    }
                }
            }
        }

        private void openFileLocationToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Process.Start("explorer.exe", @"/select, " + filePath);
        }

        private void wordWrapToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (wordWrapToolStripMenuItem.Checked == true)
            {
                customRTB.WordWrap = true;
            }
            if (wordWrapToolStripMenuItem.Checked == false)
            {
                customRTB.WordWrap = false;
            }
            ps.MenuWrap = wordWrapToolStripMenuItem.Checked;
            ps.RichWrap = customRTB.WordWrap;
            ps.Save();
        }

        private void undoToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            undoToolStripMenuItem_Click(this, new EventArgs());
        }

        public void undoToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (customRTB.CanUndo == true)
            {
                customRTB.Undo();
            }
            else customRTB.Redo();
        }

        private void cutToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            customRTB.Cut();
        }

        private void copyToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            customRTB.Copy();
        }

        private void pasteToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            customRTB.Paste(DataFormats.GetFormat(DataFormats.Text));
        }

        private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)
        {
            if (customRTB.SelectionLength != 0)
            {
                cutToolStripMenuItem1.Enabled = true;
                copyToolStripMenuItem1.Enabled = true;
                deleteToolStripMenuItem1.Enabled = true;
            }
            if (customRTB.SelectionLength == 0)
            {
                cutToolStripMenuItem1.Enabled = false;
                copyToolStripMenuItem1.Enabled = false;
                deleteToolStripMenuItem1.Enabled = false;
            }
        }

        private void deleteToolStripMenuItem_Click(object sender, EventArgs e)
        {
            customRTB.SelectedText = "";
        }

        private void deleteToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            customRTB.SelectedText = "";
        }

        private void rightToLeftToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (rightToLeftToolStripMenuItem.Checked == true)
            {
                customRTB.RightToLeft = RightToLeft.Yes;
            }
            if (rightToLeftToolStripMenuItem.Checked == false)
            {
                customRTB.RightToLeft = RightToLeft.No;
            }
        }

        private void clearToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            customRTB.Clear();
        }

        private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            AboutFrom a = new AboutFrom();
            a.ShowDialog(this);
        }

        private void selectAllToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            customRTB.SelectAll();
        }

        private void changeKeyToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ChangeKeyForm c = new ChangeKeyForm();
            c.ShowDialog(this);
        }

        public int FindMyTextNext(string text, int start)
        {
            int returnValue = -1;
            if (text.Length > 0 && start >= 0)
            {
                int indexToText = customRTB.Find(text, start, RichTextBoxFinds.MatchCase);
                if (indexToText >= 0)
                {
                    returnValue = indexToText;
                }
            }
            return returnValue;
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            bool isexist = customRTB.Highlight(searchTextBox.Text, ps.HighlightsColor, chkMatchCase.Checked, chkMatchWholeWord.Checked);
        }

        private void searchTextBox_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Escape)
            {
                searchTextBox.Text = "";
                panel1.Visible = false;
                customRTB.Height = customRTB.Height += 27;
                customRTB.Focus();
                customRTB.DeselectAll();
                customRTB.SelectionStart = caretPos;
                e.Handled = e.SuppressKeyPress = true;
            }
        }

        private void customRTB_SelectionChanged_1(object sender, EventArgs e)
        {
            if (customRTB.SelectionLength != 0)
            {
                pictureBox8.Enabled = true;
                pictureBox9.Enabled = true;
            }
            if (customRTB.SelectionLength == 0)
            {
                pictureBox8.Enabled = false;
                pictureBox9.Enabled = false;
            }
        }

        private void settingsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SettingsForm sf = new SettingsForm();
            sf.ShowDialog();
        }

        private void MainWindow_Activated(object sender, EventArgs e)
        {
            if (PublicVar.settingsChanged == true)
            { 
                PublicVar.settingsChanged = false;
                customRTB.Font = new Font(ps.RichTextFont, ps.RichTextSize);
                customRTB.ForeColor = ps.RichForeColor;
                customRTB.BackColor = ps.RichBackColor;
                this.BackColor = ps.RichBackColor;

                if (ps.SendTo)
                {
                    SendToShortcut();
                }
                else
                {
                    string shortcutPath = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + @"\Microsoft\Windows\SendTo\Crypto Notepad.lnk";
                    if (File.Exists(shortcutPath))
                    {
                        File.Delete(shortcutPath);
                    }
                }

                #region  workaround, unhighlight URLs fix
                customRTB.DetectUrls = false;
                customRTB.DetectUrls = true;
                #endregion

                if (ps.ShowToolbar == false && panel2.Visible == true)
                {
                    panel2.Visible = false;
                    int h = customRTB.Height;
                    h += 23;
                    customRTB.Height = h;
                    customRTB.Location = new Point(6, 29);
                }

                if (ps.ShowToolbar == true && panel2.Visible == false)
                {
                    panel2.Visible = true;
                    int h = customRTB.Height;
                    h -= 23;
                    customRTB.Height = h;
                    customRTB.Location = new Point(6, 52);
                }

            }

            if (PublicVar.keyChanged == true)
            {
                customRTB.Modified = true;
            }

            if (PublicVar.encryptionKey.Get() == null)
            {
                pictureBox6.Enabled = false;
                pictureBox7.Enabled = false;
                pictureBox11.Enabled = false;
                pictureBox13.Enabled = false;
            }

            if (PublicVar.encryptionKey.Get() != null)
            {
                pictureBox6.Enabled = true;
                pictureBox7.Enabled = true;
                pictureBox11.Enabled = true;
                pictureBox13.Enabled = true;
            }
        }

        private void chkMatchCase_CheckedChanged(object sender, EventArgs e)
        {
            bool isexist = customRTB.Highlight(searchTextBox.Text, ps.HighlightsColor, chkMatchCase.Checked, chkMatchWholeWord.Checked);
        }

        private void chkMatchWholeWord_CheckedChanged(object sender, EventArgs e)
        {
            bool isexist = customRTB.Highlight(searchTextBox.Text, ps.HighlightsColor, chkMatchCase.Checked, chkMatchWholeWord.Checked);
        }

        private void findToolStripMenuItem2_Click(object sender, EventArgs e)
        {
            if (panel1.Visible == false)
            {
                panel1.Visible = true;
                searchTextBox.Focus();
                customRTB.Height = customRTB.Height - 27;
                return;
            }

            if (panel1.Visible == true)
            {
                searchTextBox.Text = "";
                panel1.Visible = false;
                customRTB.Height = customRTB.Height += 27;
                customRTB.Focus();
                customRTB.DeselectAll();
                customRTB.SelectionStart = caretPos;
                return;
            }
        }

        private void documentationToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Process.Start("https://github.com/Sigmanor/Crypto-Notepad/wiki/Documentation");
            //MessageBox.Show("currentFilename: " + currentFilename);
            //MessageBox.Show("encryptionKey: " + PublicVar.encryptionKey.Get());
            //MessageBox.Show("TypedPassword: " + TypedPassword.Value);
            //MessageBox.Show("filePath: " + filePath);
        }

        private void ToolsToolStripMenuItem_DropDownOpened(object sender, EventArgs e)
        {
            if (PublicVar.encryptionKey.Get() == null)
            {
                changeKeyToolStripMenuItem.Enabled = false;
                lockToolStripMenuItem.Enabled = false;
            }
            else
            {
                changeKeyToolStripMenuItem.Enabled = true;
                lockToolStripMenuItem.Enabled = true;
            }
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {
            findToolStripMenuItem2_Click(this, new EventArgs());
        }

        private void pictureBox2_Click(object sender, EventArgs e)
        {
            newToolStripMenuItem_Click_1(this, new EventArgs());
        }

        private void pictureBox3_Click(object sender, EventArgs e)
        {
            openToolStripMenuItem_Click(this, new EventArgs());
        }

        private void pictureBox4_Click(object sender, EventArgs e)
        {
            saveToolStripMenuItem1_Click_1(this, new EventArgs());
        }

        private void pictureBox6_Click(object sender, EventArgs e)
        {
            openFileLocationToolStripMenuItem_Click(this, new EventArgs());
        }

        private void pictureBox7_Click(object sender, EventArgs e)
        {
            deleteFileToolStripMenuItem_Click_1(this, new EventArgs());
        }

        private void pictureBox8_Click(object sender, EventArgs e)
        {
            cutToolStripMenuItem_Click(this, new EventArgs());
        }

        private void pictureBox9_Click(object sender, EventArgs e)
        {
            copyToolStripMenuItem_Click(this, new EventArgs());
        }

        private void pictureBox10_Click(object sender, EventArgs e)
        {
            pasteToolStripMenuItem_Click(this, new EventArgs());
        }

        private void pictureBox11_Click(object sender, EventArgs e)
        {
            changeKeyToolStripMenuItem_Click(this, new EventArgs());
        }

        private void pictureBox5_Click(object sender, EventArgs e)
        {
            settingsToolStripMenuItem_Click(this, new EventArgs());
        }

        private void pictureBox12_Click(object sender, EventArgs e)
        {
            panel2.Visible = false;
            int h = customRTB.Height;
            h += 23;
            customRTB.Height = h;
            customRTB.Location = new Point(6, 29);
            ps.ShowToolbar = false;
            ps.Save();
        }

        private void pictureBox12_MouseEnter(object sender, EventArgs e)
        {
            pictureBox12.Image = Properties.Resources.close_b;
        }

        private void pictureBox12_MouseLeave(object sender, EventArgs e)
        {
            pictureBox12.Image = Properties.Resources.close_g;
        }

        private void pictureBox1_MouseHover(object sender, EventArgs e)
        {
            pictureBox1.Image = Properties.Resources.close_b;
        }

        private void pictureBox1_MouseLeave(object sender, EventArgs e)
        {
            pictureBox1.Image = Properties.Resources.close_g;
        }

        private void pictureBox13_Click(object sender, EventArgs e)
        {
            AutoLock(false);
        }

        private void EditToolStripMenuItem_DropDownOpened(object sender, EventArgs e)
        {
            if (customRTB.SelectionLength != 0)
            {
                cutToolStripMenuItem.Enabled = true;
                copyToolStripMenuItem.Enabled = true;
                deleteToolStripMenuItem.Enabled = true;
            }
            if (customRTB.SelectionLength == 0)
            {
                cutToolStripMenuItem.Enabled = false;
                copyToolStripMenuItem.Enabled = false;
                deleteToolStripMenuItem.Enabled = false;
            }
        }

        private void сheckForUpdatesToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Thread up = new Thread(() => сheckForUpdates(true));
            up.Start();
        }

        public void сheckForUpdates(bool autoCheck)
        {
            try
            {
                WebClient client = new WebClient();
                Stream stream = client.OpenRead("https://raw.githubusercontent.com/Sigmanor/Crypto-Notepad/master/version.txt");
                StreamReader reader = new StreamReader(stream);
                string content = reader.ReadToEnd();
                string version = Application.ProductVersion;
                string exePath = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location) + @"\";

                int appVersion = Convert.ToInt32(version.Replace(".", "")), serverVersion = Convert.ToInt32(content.Replace(".", ""));

                if (serverVersion > appVersion)
                {
                    MainMenu.Invoke((Action)delegate
                    {
                        using (new CenterWinDialog(this))
                        {
                            DialogResult res = new DialogResult();

                            res = MessageBox.Show("New version is available. Install it now?", "Update", MessageBoxButtons.YesNo, MessageBoxIcon.Information);

                            if (res == DialogResult.Yes)
                            {
                                File.WriteAllBytes(exePath + "Ionic.Zip.dll", Properties.Resources.Ionic_Zip);
                                File.WriteAllBytes(exePath + "Updater.exe", Properties.Resources.Updater);

                                var pr = new Process();
                                pr.StartInfo.FileName = exePath + "Updater.exe";
                                pr.StartInfo.Arguments = "/u";
                                pr.Start();
                                Application.Exit();
                            }
                        }
                    });
                }

                if (serverVersion <= appVersion && autoCheck == true)
                {
                    MainMenu.Invoke((Action)delegate
                    {
                        using (new CenterWinDialog(this))
                        {
                            MessageBox.Show("Crypto Notepad is up to date.", "Update", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        }
                    });
                }

            }
            catch
            {
                return;
            }
        }

        void AutoLock(bool minimize)
        {
            EnterKeyForm f2 = new EnterKeyForm();
            PublicVar.encryptionKey.Set(null);
            caretPos = customRTB.SelectionStart;
            f2.MinimizeBox = true;
            this.Hide();

            if (minimize == true)
            {
                f2.WindowState = FormWindowState.Minimized;
            }
            f2.ShowDialog();

            if (PublicVar.okPressed == false)
            {
                PublicVar.encryptionKey.Set(null);
                customRTB.Clear();
                this.Text = appName.Remove(14);
                OpenFile.FileName = "";
                this.Show();
                return;
            }
            PublicVar.okPressed = false;

            try
            {
                OpenFile.FileName = filePath;
                string opnfile = File.ReadAllText(OpenFile.FileName);
                string NameWithotPath = Path.GetFileName(OpenFile.FileName);
                string de = AES.Decrypt(opnfile, TypedPassword.Value, ps.TheSalt, ps.HashAlgorithm, ps.PasswordIterations, ps.KeySize);

                this.Text = appName + NameWithotPath;
                filePath = OpenFile.FileName;

                string cc2 = customRTB.Text.Length.ToString(CultureInfo.InvariantCulture);
                customRTB.SelectionStart = caretPos;
                PublicVar.encryptionKey.Set(TypedPassword.Value);
                TypedPassword.Value = null;
                this.Show();
            }
            catch (Exception ex)
            {
                if (ex is CryptographicException)
                {
                    TypedPassword.Value = null;
                    DialogResult dialogResult = MessageBox.Show("Invalid key!", "Crypto Notepad", MessageBoxButtons.RetryCancel, MessageBoxIcon.Error);
                    if (dialogResult == DialogResult.Retry)
                    {
                        AutoLock(false);
                    }
                    if (dialogResult == DialogResult.Cancel)
                    {
                        PublicVar.encryptionKey.Set(null);
                        customRTB.Clear();
                        this.Text = appName.Remove(14);
                        OpenFile.FileName = "";
                        this.Show();
                        return;
                    }
                }
            }
        }

        protected override void WndProc(ref Message m)
        {
            const int WM_SYSCOMMAND = 0x112;
            const int SC_MINIMIZE = 0xF020;

            if (m.Msg == WM_SYSCOMMAND && m.WParam.ToInt32() == SC_MINIMIZE && ps.AutoLock == true && PublicVar.encryptionKey.Get() != null)
            {
                AutoLock(true);
                return;
            }

            base.WndProc(ref m);
        }

        private void lockToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (ps.AutoSave)
            {
                saveToolStripMenuItem1_Click_1(this, new EventArgs());
            }
            else
            {
                saveConfirm(false);
            }
            AutoLock(false);
        }

        private void FileToolStripMenuItem_DropDownOpened(object sender, EventArgs e)
        {
            if (currentFilename == "")
            {
                openFileLocationToolStripMenuItem.Enabled = false;
                deleteFileToolStripMenuItem.Enabled = false;
            }
            else
            {
                openFileLocationToolStripMenuItem.Enabled = true;
                deleteFileToolStripMenuItem.Enabled = true;
            }
        }

        private void customRTB_Click(object sender, EventArgs e)
        {
            caretPos = customRTB.SelectionStart;
        }

        private void customRTB_KeyDown(object sender, KeyEventArgs e)
        {
            caretPos = customRTB.SelectionStart;
            if (e.KeyCode == Keys.ShiftKey)
            {
                shiftPresed = true;
            }
        }

        private void customRTB_LinkClicked(object sender, LinkClickedEventArgs e)
        {
            if (shiftPresed)
            {
                shiftPresed = false;
                Process.Start(e.LinkText);
            }
        }

        private void customRTB_DragDrop(object sender, DragEventArgs e)
        {
            saveConfirm(false);
            if (cancelPressed == true)
            {
                cancelPressed = false;
                return;
            }

            string[] FileList = (string[])e.Data.GetData(DataFormats.FileDrop, false);
            foreach (string file in FileList) OpenFile.FileName = file;
            object fname = e.Data.GetData("FileDrop");
            if (fname != null)
            {
                var list = fname as string[];
                if (list != null && !string.IsNullOrWhiteSpace(list[0]))
                {
                    if (!OpenFile.FileName.Contains(".cnp"))
                    {
                        string opnfile = File.ReadAllText(OpenFile.FileName);
                        string NameWithotPath = Path.GetFileName(OpenFile.FileName);
                        customRTB.Text = opnfile;
                        this.Text = appName + NameWithotPath;
                        string cc2 = customRTB.Text.Length.ToString(CultureInfo.InvariantCulture);
                        customRTB.Select(Convert.ToInt32(cc2), 0);
                        currentFilename = Path.GetFileName(OpenFile.FileName);
                        filePath = OpenFile.FileName;
                        return;
                    }
                    PublicVar.openFileName = Path.GetFileName(OpenFile.FileName);
                    DecryptAES();
                    if (PublicVar.okPressed == true)
                    {
                        PublicVar.okPressed = false;
                    }
                }
            }
        }

        public void saveConfirm(bool exit)
        {
            if (customRTB.Modified == false)
            {
                if (exit == true)
                {
                    Environment.Exit(0);
                }
            }

            if (customRTB.Modified == true)
            {
                if (currentFilename == "")
                {
                    currentFilename = "Unnamed.cnp";
                }

                if (customRTB.Text != "")
                {
                    DialogResult res = new DialogResult();
                    string messageBoxText = "";

                    if (PublicVar.keyChanged == false)
                    {
                        messageBoxText = "Save file: " + "\"" + currentFilename + "\"" + " ? ";
                    }
                    if (PublicVar.keyChanged == true)
                    {
                        messageBoxText = "Save file: " + "\"" + currentFilename + "\"" + " with a new key? ";
                    }

                    using (new CenterWinDialog(this))
                    {
                        res = MessageBox.Show(messageBoxText, "Crypto Notepad",
                                                  MessageBoxButtons.YesNoCancel,
                                                  MessageBoxIcon.Question);
                        if (res == DialogResult.Yes)
                        {
                            saveToolStripMenuItem1_Click_1(this, new EventArgs());
                            if (exit == true)
                            {
                                Environment.Exit(0);
                            }

                        }

                        if (res == DialogResult.No)
                        {
                            if (exit == true)
                            {
                                Environment.Exit(0);
                            }
                        }

                        if (res == DialogResult.Cancel)
                        {
                            noExit = true;
                            cancelPressed = true;
                            return;
                        }
                    }
                }
            }
        }
     
        private void customRTB_KeyUp(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.ShiftKey)
            {
                shiftPresed = false;
            }
        }
    }
}