Security.cs

using System;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
using System.Runtime.InteropServices;
using System.Collections.Specialized;

namespace Cosy
{
	public partial class Security : Form
	{
		[DllImport("Gdi32.dll", EntryPoint = "CreateRoundRectRgn")]
		private static extern IntPtr CreateRoundRectRgn(int nLeftRect, int nTopRect, int nRightRect, int nBottomRect, int nWidthEllipse, int nHeightEllipse);
		private bool mouseIsDown;
		private Point firstPoint;
		public string[] files;
		public Security(string[] fileNames, bool mode)
		{
			files = fileNames;
			InitializeComponent();
			Region = Region.FromHrgn(CreateRoundRectRgn(0, 0, Width, Height, 20, 20));
			Exit.Region = Region.FromHrgn(CreateRoundRectRgn(0, 0, Exit.Width, Exit.Height, 5, 5));
			password.Region = Region.FromHrgn(CreateRoundRectRgn(0, 0, password.Width, password.Height, 5, 5));
			Login.Region = Region.FromHrgn(CreateRoundRectRgn(0, 0, Login.Width, Login.Height, 5, 5));
			KeyPreview = true;
			Login.Text = mode ? "ENCRYPT" : "DECRYPT";
		}
		void Security_KeyDown(object sender, KeyEventArgs e)
		{
			if (e.KeyCode == Keys.Enter)
			{
				Save_Click(sender, e);
			}
		}
		private void Save_Click(object sender, EventArgs e)
		{
			if (string.IsNullOrEmpty(password.Text))
			{
				MessageBox.Show("Password cannot be empty!");
			}
			try
			{
				if (Login.Text == "ENCRYPT")
				{
					foreach (string file in files)
					{
						byte[] bytes = File.ReadAllBytes(file);
						Encryptor.Compile($"{file}.cosy", bytes, password.Text);
						File.Delete(file);
					}
				}
				else if (Login.Text == "DECRYPT")
				{
					foreach (string file in files)
					{
						byte[] bytes = Encryptor.Decompile(file, password.Text);
						File.WriteAllBytes(file[0..^5], bytes);
						File.Delete(file);
					}
				}
				Close();
			}
			catch (Exception ex)
			{
				MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
			}
		}
		private void Save_MouseEnter(object sender, EventArgs e)
		{
			Login.BackColor = Color.Silver;
		}
		private void Save_MouseLeave(object sender, EventArgs e)
		{
			Login.BackColor = Color.DarkGray;
		}
		private void Exit_MouseEnter(object sender, EventArgs e)
		{
			Exit.BackColor = Color.Red;
		}
		private void Exit_MouseLeave(object sender, EventArgs e)
		{
			Exit.BackColor = Color.DimGray;
		}
		private void Exit_Click(object sender, EventArgs e)
		{
			Close();
		}
		private void TitleBar_MouseDown(object sender, MouseEventArgs e)
		{
			firstPoint = e.Location;
			mouseIsDown = true;
		}
		private void TitleBar_MouseUp(object sender, MouseEventArgs e)
		{
			mouseIsDown = false;
		}
		private void TitleBar_MouseMove(object sender, MouseEventArgs e)
		{
			if (mouseIsDown)
			{
				int xDiff = firstPoint.X - e.Location.X;
				int yDiff = firstPoint.Y - e.Location.Y;
				int x = Location.X - xDiff;
				int y = Location.Y - yDiff;
				Location = new Point(x, y);
			}
		}
	}
}