Tiny Encryption Algorithm (TEA) for the Compact Framework

using System;
using System.Drawing;
using System.Collections;
using System.Windows.Forms;
using System.Data;

namespace TeaCrypto
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Button cmdEncryptDecrypt;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox txtKey;
		private System.Windows.Forms.TextBox txtData;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.MainMenu mainMenu1;
		string cipher;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			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.mainMenu1 = new System.Windows.Forms.MainMenu();
			this.cmdEncryptDecrypt = new System.Windows.Forms.Button();
			this.label1 = new System.Windows.Forms.Label();
			this.txtKey = new System.Windows.Forms.TextBox();
			this.txtData = new System.Windows.Forms.TextBox();
			this.label2 = new System.Windows.Forms.Label();
			// 
			// cmdEncryptDecrypt
			// 
			this.cmdEncryptDecrypt.Location = new System.Drawing.Point(8, 144);
			this.cmdEncryptDecrypt.Size = new System.Drawing.Size(120, 40);
			this.cmdEncryptDecrypt.Text = "Encrypt";
			this.cmdEncryptDecrypt.Click += new System.EventHandler(this.cmdEncryptDecrypt_Click);
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(8, 8);
			this.label1.Size = new System.Drawing.Size(36, 16);
			this.label1.Text = "Key:";
			// 
			// txtKey
			// 
			this.txtKey.Location = new System.Drawing.Point(44, 4);
			this.txtKey.Size = new System.Drawing.Size(184, 22);
			this.txtKey.Text = "0123456789ABCDEF";
			// 
			// txtData
			// 
			this.txtData.Location = new System.Drawing.Point(8, 48);
			this.txtData.Multiline = true;
			this.txtData.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
			this.txtData.Size = new System.Drawing.Size(220, 88);
			this.txtData.Text = "This is a test string!";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(8, 32);
			this.label2.Size = new System.Drawing.Size(76, 16);
			this.label2.Text = "Data:";
			// 
			// Form1
			// 
			this.Controls.Add(this.label2);
			this.Controls.Add(this.txtData);
			this.Controls.Add(this.txtKey);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.cmdEncryptDecrypt);
			this.Menu = this.mainMenu1;
			this.MinimizeBox = false;
			this.Text = "Tea Encryption";

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>

		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void cmdEncryptDecrypt_Click(object sender, System.EventArgs e)
		{
			XTea t = new XTea();
			if(cmdEncryptDecrypt.Text == "Encrypt")
			{
				cipher = t.EncryptString(txtData.Text, txtKey.Text);
				txtData.ReadOnly = true;
				txtData.Text = cipher;
			}
			else
			{
				txtData.Text = t.Decrypt(cipher, txtKey.Text);
				txtData.ReadOnly = false;
			}

			cmdEncryptDecrypt.Text = (cmdEncryptDecrypt.Text == "Encrypt")?"Decrypt":"Encrypt";
		}
	}
}