encrypt.cs

This code is a cipher which takes in a plaintext or ciphertext string and encrypts / decrypts accord

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

namespace Encrypt
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.GroupBox groupBox1;
		private System.Windows.Forms.Button decryptbutton;
		private System.Windows.Forms.Button encryptbutton;
		private System.Windows.Forms.GroupBox groupBox2;
		private System.Windows.Forms.RadioButton plainButton;
		private System.Windows.Forms.RadioButton cypherButton;
		private System.Windows.Forms.TextBox plaintext;
		private System.Windows.Forms.TextBox cyphertext;
		private System.Windows.Forms.Button Quit;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox IncValue;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		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 )
		{
			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.groupBox1 = new System.Windows.Forms.GroupBox();
			this.label1 = new System.Windows.Forms.Label();
			this.Quit = new System.Windows.Forms.Button();
			this.IncValue = new System.Windows.Forms.TextBox();
			this.cyphertext = new System.Windows.Forms.TextBox();
			this.groupBox2 = new System.Windows.Forms.GroupBox();
			this.plainButton = new System.Windows.Forms.RadioButton();
			this.cypherButton = new System.Windows.Forms.RadioButton();
			this.decryptbutton = new System.Windows.Forms.Button();
			this.encryptbutton = new System.Windows.Forms.Button();
			this.plaintext = new System.Windows.Forms.TextBox();
			this.groupBox1.SuspendLayout();
			this.groupBox2.SuspendLayout();
			this.SuspendLayout();
			// 
			// groupBox1
			// 
			this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
																					this.label1,
																					this.Quit,
																					this.IncValue,
																					this.cyphertext,
																					this.groupBox2,
																					this.decryptbutton,
																					this.encryptbutton,
																					this.plaintext});
			this.groupBox1.Location = new System.Drawing.Point(8, 0);
			this.groupBox1.Name = "groupBox1";
			this.groupBox1.Size = new System.Drawing.Size(312, 120);
			this.groupBox1.TabIndex = 8;
			this.groupBox1.TabStop = false;
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(8, 80);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(176, 32);
			this.label1.TabIndex = 20;
			this.label1.Text = "Please Enter the Value by which you want to decrypt/encrypt by:";
			// 
			// Quit
			// 
			this.Quit.Location = new System.Drawing.Point(232, 80);
			this.Quit.Name = "Quit";
			this.Quit.Size = new System.Drawing.Size(72, 24);
			this.Quit.TabIndex = 19;
			this.Quit.Text = "&Quit";
			this.Quit.Click += new System.EventHandler(this.Quit_Click);
			// 
			// IncValue
			// 
			this.IncValue.Location = new System.Drawing.Point(192, 88);
			this.IncValue.Name = "IncValue";
			this.IncValue.Size = new System.Drawing.Size(24, 20);
			this.IncValue.TabIndex = 18;
			this.IncValue.Text = "";
			this.IncValue.TextChanged += new System.EventHandler(this.IncValue_TextChanged_1);
			// 
			// cyphertext
			// 
			this.cyphertext.Location = new System.Drawing.Point(120, 48);
			this.cyphertext.Name = "cyphertext";
			this.cyphertext.Size = new System.Drawing.Size(104, 20);
			this.cyphertext.TabIndex = 17;
			this.cyphertext.Text = "Decrypted Message";
			// 
			// groupBox2
			// 
			this.groupBox2.Controls.AddRange(new System.Windows.Forms.Control[] {
																					this.plainButton,
																					this.cypherButton});
			this.groupBox2.Name = "groupBox2";
			this.groupBox2.Size = new System.Drawing.Size(112, 80);
			this.groupBox2.TabIndex = 16;
			this.groupBox2.TabStop = false;
			
			// 
			// plainButton
			// 
			this.plainButton.Checked = true;
			this.plainButton.Location = new System.Drawing.Point(16, 16);
			this.plainButton.Name = "plainButton";
			this.plainButton.Size = new System.Drawing.Size(80, 24);
			this.plainButton.TabIndex = 2;
			this.plainButton.TabStop = true;
			this.plainButton.Text = "PlainText";
			this.plainButton.CheckedChanged += new System.EventHandler(this.plainButton_CheckedChanged);
			// 
			// cypherButton
			// 
			this.cypherButton.Location = new System.Drawing.Point(16, 48);
			this.cypherButton.Name = "cypherButton";
			this.cypherButton.Size = new System.Drawing.Size(88, 24);
			this.cypherButton.TabIndex = 3;
			this.cypherButton.Text = "CypherText";
			this.cypherButton.CheckedChanged += new System.EventHandler(this.cypherButton_CheckedChanged);
			// 
			// decryptbutton
			// 
			this.decryptbutton.Location = new System.Drawing.Point(232, 48);
			this.decryptbutton.Name = "decryptbutton";
			this.decryptbutton.TabIndex = 13;
			this.decryptbutton.Text = "&Decrypt";
			this.decryptbutton.Click += new System.EventHandler(this.decryptbutton_Click);
			// 
			// encryptbutton
			// 
			this.encryptbutton.Location = new System.Drawing.Point(232, 16);
			this.encryptbutton.Name = "encryptbutton";
			this.encryptbutton.TabIndex = 14;
			this.encryptbutton.Text = "&Encrypt";
			this.encryptbutton.Click += new System.EventHandler(this.encryptbutton_Click);
			// 
			// plaintext
			// 
			this.plaintext.Location = new System.Drawing.Point(120, 16);
			this.plaintext.Name = "plaintext";
			this.plaintext.Size = new System.Drawing.Size(104, 20);
			this.plaintext.TabIndex = 12;
			this.plaintext.Text = "";
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(320, 121);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.groupBox1});
			this.Location = new System.Drawing.Point(120, 48);
			this.Name = "Form1";
			this.Text = "Encrypt / Decrypt Program";
			this.Load += new System.EventHandler(this.Form1_Load);
			this.groupBox1.ResumeLayout(false);
			this.groupBox2.ResumeLayout(false);
			this.ResumeLayout(false);

		}
		#endregion

		
		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void Form1_Load(object sender, System.EventArgs e)
		{
			this.plaintext.Enabled = true;
			this.cyphertext.Enabled = false;
			this.encryptbutton.Enabled = true;
			this.decryptbutton.Enabled = false;
		
		
		}


		private void plainButton_CheckedChanged(object sender, System.EventArgs e)
		{
			this.plaintext.Enabled = true;
			this.plaintext.Text = "";
			this.cyphertext.Enabled = false;
			this.encryptbutton.Enabled = true;
			this.decryptbutton.Enabled = false;
			this.cyphertext.Text = "Encrypted Message"; 
			this.plaintext.Focus();
			this.IncValue.Text = "";
			
			
		}

		private void cypherButton_CheckedChanged(object sender, System.EventArgs e)
		{	
			this.cyphertext.Text = "";
			this.plaintext.Enabled = false;
			this.cyphertext.Enabled = true;
			this.encryptbutton.Enabled = false;
			this.decryptbutton.Enabled = true;
			this.plaintext.Text = "Decrypted Message";
			this.cyphertext.Focus();
			this.IncValue.Text = "";
			
		}

		private void decryptbutton_Click(object sender, System.EventArgs e)
		{
			Decryption decrypt = new Decryption();
			string temp = "";
			if(this.cyphertext.Text == "")
			{
				MessageBox.Show("Cannot Decrypt - no cyphertext entered!");
				this.cyphertext.Focus();
				
			}	
			else 
				try
				{
					temp = decrypt.Decrypt(this.cyphertext.Text, this.IncValue.Text);
					this.plaintext.Text = temp;
					
				}
					
				catch(Exception excep)
				{
					string type = excep.GetType().ToString();

					if(type == "System.FormatException")
					{
						MessageBox.Show("Please Enter in a value by which to Decrypt by");
						this.IncValue.Focus();
						this.IncValue.Text = "";
						System.Console.WriteLine("The following is a detailed description of the error\n" + type);
					}
					else if(type == "System.OverflowException")
					{
						MessageBox.Show("Number to large to encrypt, please enter in another number");
						this.IncValue.Focus();
						this.IncValue.Text = "";
						System.Console.WriteLine("The following is a detailed description of the error\n" + type);
					}
					else
					{
						MessageBox.Show("Unexpected Exception");
						System.Console.WriteLine("The following is a detailed description of the error\n" + type);
					}
				}
		
		}

		private void encryptbutton_Click(object sender, System.EventArgs e)
		{	
			Encryption encrypt = new Encryption();
			string temp = "";
			if(this.plaintext.Text == "")
			{
				MessageBox.Show("Cannot Encrypt - No Plaintext entered");
				this.plaintext.Focus();
			}	
				else 
				try
				{
					temp = encrypt.Encrypt(this.plaintext.Text, this.IncValue.Text);
					cyphertext.Text = temp;
				}
			
				catch(FormatException fexcept)
				{
					MessageBox.Show("Please enter in a numeric value by which to Encrypt by");
					string tempex = fexcept.ToString();
					this.IncValue.Text = "";
					this.IncValue.Focus();
					System.Console.WriteLine("The following is a detailed description of the error\n" + tempex);
				}
		
				catch(OverflowException overex)
				{
					MessageBox.Show("Number to large to encrypt, please enter in another number");
					string tempex = overex.ToString();
					this.IncValue.Text = "";
					this.IncValue.Focus();
					System.Console.WriteLine("The following is a detailed description of the error\n" + tempex);
					
				}
			
		}
	

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

		private void IncValue_TextChanged(object sender, System.EventArgs e)
		{
			if(this.IncValue.Text == "")
			{
				MessageBox.Show("Please Enter in a value by which to Encrypt/Decrypt by");
			}
		}

		private void IncValue_TextChanged_1(object sender, System.EventArgs e)
		{/*
			if(! this.IncValue.Text.StartsWith("1"))
			{
				MessageBox.Show("woops"); 
			 }*/
		}

		
		

		

	
	}
}