////////////////////////////////////////////////////////////////////
/// frmMain.cs
/// © 2005 Carl Johansen
/// 
/// UI for RSA Encryption demonstration
////////////////////////////////////////////////////////////////////
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace CarlInc.Demos.RSA
{
	/// <summary>
	/// UI for RSA Encryption demonstration
	/// </summary>
	public class frmMain : System.Windows.Forms.Form
	{
		private System.Windows.Forms.GroupBox groupBox1;
		private System.Windows.Forms.RichTextBox richTxtKeyGenProgress;
		private System.Windows.Forms.GroupBox groupBox2;
		private System.Windows.Forms.Label label4;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.Button cmdGenerateKey;
		private System.Windows.Forms.Label label1;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;
		private System.Windows.Forms.GroupBox groupBox3;
		private System.Windows.Forms.Button cmdEncryptPublic;
		private System.Windows.Forms.Label label6;
		private System.Windows.Forms.TextBox txtMsgToEncrypt;
		private System.Windows.Forms.Button cmdEncryptPrivate;
		private System.Windows.Forms.TextBox txtEncryptedMsg;
		private System.Windows.Forms.Label label5;
		private System.Windows.Forms.Label lblPrivateKey;
		private System.Windows.Forms.Label lblPublicKey;
		private System.Windows.Forms.Label label9;
		private System.Windows.Forms.Label label10;
		private System.Windows.Forms.Label lblPhiNvalue;
		private System.Windows.Forms.Label lblNvalue;
		private System.Windows.Forms.Label lblPhiN;
		private System.Windows.Forms.ComboBox cboPrime1;
		private System.Windows.Forms.ComboBox cboPrime2;
		private System.Windows.Forms.GroupBox groupBox4;
		private System.Windows.Forms.TextBox txtPrivateCipher;
		private System.Windows.Forms.TextBox txtPublicCipher;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Label label7;
		private System.Windows.Forms.Label lblMsgNum;
		private System.Windows.Forms.Label lblMsgMod;
		private System.Windows.Forms.Label lblEncryptionExponent;

		private RSAEncryptor rsaEncryptor = new RSAEncryptor();
		private delegate uint EncryptDelegate(uint theMessage);

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

		/// <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.lblPrivateKey = new System.Windows.Forms.Label();
			this.lblPublicKey = new System.Windows.Forms.Label();
			this.label9 = new System.Windows.Forms.Label();
			this.label10 = new System.Windows.Forms.Label();
			this.lblPhiNvalue = new System.Windows.Forms.Label();
			this.lblNvalue = new System.Windows.Forms.Label();
			this.lblPhiN = new System.Windows.Forms.Label();
			this.label1 = new System.Windows.Forms.Label();
			this.richTxtKeyGenProgress = new System.Windows.Forms.RichTextBox();
			this.groupBox2 = new System.Windows.Forms.GroupBox();
			this.cboPrime2 = new System.Windows.Forms.ComboBox();
			this.cboPrime1 = new System.Windows.Forms.ComboBox();
			this.cmdGenerateKey = new System.Windows.Forms.Button();
			this.label4 = new System.Windows.Forms.Label();
			this.label3 = new System.Windows.Forms.Label();
			this.groupBox3 = new System.Windows.Forms.GroupBox();
			this.lblEncryptionExponent = new System.Windows.Forms.Label();
			this.lblMsgMod = new System.Windows.Forms.Label();
			this.lblMsgNum = new System.Windows.Forms.Label();
			this.label5 = new System.Windows.Forms.Label();
			this.txtEncryptedMsg = new System.Windows.Forms.TextBox();
			this.cmdEncryptPrivate = new System.Windows.Forms.Button();
			this.cmdEncryptPublic = new System.Windows.Forms.Button();
			this.label6 = new System.Windows.Forms.Label();
			this.txtMsgToEncrypt = new System.Windows.Forms.TextBox();
			this.groupBox4 = new System.Windows.Forms.GroupBox();
			this.label7 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.txtPrivateCipher = new System.Windows.Forms.TextBox();
			this.txtPublicCipher = new System.Windows.Forms.TextBox();
			this.groupBox1.SuspendLayout();
			this.groupBox2.SuspendLayout();
			this.groupBox3.SuspendLayout();
			this.groupBox4.SuspendLayout();
			this.SuspendLayout();
			// 
			// groupBox1
			// 
			this.groupBox1.Controls.Add(this.lblPrivateKey);
			this.groupBox1.Controls.Add(this.lblPublicKey);
			this.groupBox1.Controls.Add(this.label9);
			this.groupBox1.Controls.Add(this.label10);
			this.groupBox1.Controls.Add(this.lblPhiNvalue);
			this.groupBox1.Controls.Add(this.lblNvalue);
			this.groupBox1.Controls.Add(this.lblPhiN);
			this.groupBox1.Controls.Add(this.label1);
			this.groupBox1.Controls.Add(this.richTxtKeyGenProgress);
			this.groupBox1.Location = new System.Drawing.Point(8, 152);
			this.groupBox1.Name = "groupBox1";
			this.groupBox1.Size = new System.Drawing.Size(304, 288);
			this.groupBox1.TabIndex = 7;
			this.groupBox1.TabStop = false;
			this.groupBox1.Text = "Step 2 - Key generation";
			// 
			// lblPrivateKey
			// 
			this.lblPrivateKey.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.lblPrivateKey.Location = new System.Drawing.Point(104, 264);
			this.lblPrivateKey.Name = "lblPrivateKey";
			this.lblPrivateKey.Size = new System.Drawing.Size(112, 13);
			this.lblPrivateKey.TabIndex = 18;
			// 
			// lblPublicKey
			// 
			this.lblPublicKey.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.lblPublicKey.Location = new System.Drawing.Point(104, 240);
			this.lblPublicKey.Name = "lblPublicKey";
			this.lblPublicKey.Size = new System.Drawing.Size(112, 13);
			this.lblPublicKey.TabIndex = 17;
			// 
			// label9
			// 
			this.label9.Location = new System.Drawing.Point(24, 264);
			this.label9.Name = "label9";
			this.label9.Size = new System.Drawing.Size(64, 13);
			this.label9.TabIndex = 16;
			this.label9.Text = "Private key:";
			this.label9.TextAlign = System.Drawing.ContentAlignment.TopRight;
			// 
			// label10
			// 
			this.label10.Location = new System.Drawing.Point(16, 240);
			this.label10.Name = "label10";
			this.label10.Size = new System.Drawing.Size(72, 13);
			this.label10.TabIndex = 15;
			this.label10.Text = "Public key:";
			this.label10.TextAlign = System.Drawing.ContentAlignment.TopRight;
			// 
			// lblPhiNvalue
			// 
			this.lblPhiNvalue.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.lblPhiNvalue.Location = new System.Drawing.Point(232, 24);
			this.lblPhiNvalue.Name = "lblPhiNvalue";
			this.lblPhiNvalue.Size = new System.Drawing.Size(56, 13);
			this.lblPhiNvalue.TabIndex = 14;
			// 
			// lblNvalue
			// 
			this.lblNvalue.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.lblNvalue.Location = new System.Drawing.Point(72, 24);
			this.lblNvalue.Name = "lblNvalue";
			this.lblNvalue.Size = new System.Drawing.Size(40, 13);
			this.lblNvalue.TabIndex = 13;
			// 
			// lblPhiN
			// 
			this.lblPhiN.Location = new System.Drawing.Point(120, 24);
			this.lblPhiN.Name = "lblPhiN";
			this.lblPhiN.Size = new System.Drawing.Size(104, 13);
			this.lblPhiN.TabIndex = 12;
			this.lblPhiN.Text = "Φ(n)  [=(p-1)*(q-1)]:";
			this.lblPhiN.TextAlign = System.Drawing.ContentAlignment.TopRight;
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(16, 24);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(48, 13);
			this.label1.TabIndex = 10;
			this.label1.Text = "n [=p*q]:";
			this.label1.TextAlign = System.Drawing.ContentAlignment.TopRight;
			// 
			// richTxtKeyGenProgress
			// 
			this.richTxtKeyGenProgress.Enabled = false;
			this.richTxtKeyGenProgress.Location = new System.Drawing.Point(8, 48);
			this.richTxtKeyGenProgress.Name = "richTxtKeyGenProgress";
			this.richTxtKeyGenProgress.Size = new System.Drawing.Size(288, 184);
			this.richTxtKeyGenProgress.TabIndex = 4;
			this.richTxtKeyGenProgress.Text = "";
			// 
			// groupBox2
			// 
			this.groupBox2.Controls.Add(this.cboPrime2);
			this.groupBox2.Controls.Add(this.cboPrime1);
			this.groupBox2.Controls.Add(this.cmdGenerateKey);
			this.groupBox2.Controls.Add(this.label4);
			this.groupBox2.Controls.Add(this.label3);
			this.groupBox2.Location = new System.Drawing.Point(8, 8);
			this.groupBox2.Name = "groupBox2";
			this.groupBox2.Size = new System.Drawing.Size(304, 120);
			this.groupBox2.TabIndex = 8;
			this.groupBox2.TabStop = false;
			this.groupBox2.Text = "Step 1 - Enter two prime numbers";
			// 
			// cboPrime2
			// 
			this.cboPrime2.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
			this.cboPrime2.Location = new System.Drawing.Point(128, 56);
			this.cboPrime2.Name = "cboPrime2";
			this.cboPrime2.Size = new System.Drawing.Size(64, 21);
			this.cboPrime2.TabIndex = 2;
			// 
			// cboPrime1
			// 
			this.cboPrime1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
			this.cboPrime1.Location = new System.Drawing.Point(128, 24);
			this.cboPrime1.Name = "cboPrime1";
			this.cboPrime1.Size = new System.Drawing.Size(64, 21);
			this.cboPrime1.TabIndex = 1;
			// 
			// cmdGenerateKey
			// 
			this.cmdGenerateKey.Location = new System.Drawing.Point(72, 88);
			this.cmdGenerateKey.Name = "cmdGenerateKey";
			this.cmdGenerateKey.Size = new System.Drawing.Size(128, 24);
			this.cmdGenerateKey.TabIndex = 3;
			this.cmdGenerateKey.Text = "Generate Key";
			this.cmdGenerateKey.Click += new System.EventHandler(this.cmdGenerateKey_Click);
			// 
			// label4
			// 
			this.label4.Location = new System.Drawing.Point(32, 64);
			this.label4.Name = "label4";
			this.label4.Size = new System.Drawing.Size(96, 13);
			this.label4.TabIndex = 9;
			this.label4.Text = "Second prime (q):";
			// 
			// label3
			// 
			this.label3.Location = new System.Drawing.Point(32, 32);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(80, 13);
			this.label3.TabIndex = 8;
			this.label3.Text = "First prime (p):";
			// 
			// groupBox3
			// 
			this.groupBox3.Controls.Add(this.lblEncryptionExponent);
			this.groupBox3.Controls.Add(this.lblMsgMod);
			this.groupBox3.Controls.Add(this.lblMsgNum);
			this.groupBox3.Controls.Add(this.label5);
			this.groupBox3.Controls.Add(this.txtEncryptedMsg);
			this.groupBox3.Controls.Add(this.cmdEncryptPrivate);
			this.groupBox3.Controls.Add(this.cmdEncryptPublic);
			this.groupBox3.Controls.Add(this.label6);
			this.groupBox3.Controls.Add(this.txtMsgToEncrypt);
			this.groupBox3.Location = new System.Drawing.Point(344, 8);
			this.groupBox3.Name = "groupBox3";
			this.groupBox3.Size = new System.Drawing.Size(296, 120);
			this.groupBox3.TabIndex = 9;
			this.groupBox3.TabStop = false;
			this.groupBox3.Text = "Step 3 - Encrypt a message";
			// 
			// lblEncryptionExponent
			// 
			this.lblEncryptionExponent.Location = new System.Drawing.Point(96, 90);
			this.lblEncryptionExponent.Name = "lblEncryptionExponent";
			this.lblEncryptionExponent.Size = new System.Drawing.Size(32, 13);
			this.lblEncryptionExponent.TabIndex = 14;
			// 
			// lblMsgMod
			// 
			this.lblMsgMod.Location = new System.Drawing.Point(128, 96);
			this.lblMsgMod.Name = "lblMsgMod";
			this.lblMsgMod.Size = new System.Drawing.Size(72, 13);
			this.lblMsgMod.TabIndex = 13;
			// 
			// lblMsgNum
			// 
			this.lblMsgNum.Location = new System.Drawing.Point(56, 96);
			this.lblMsgNum.Name = "lblMsgNum";
			this.lblMsgNum.Size = new System.Drawing.Size(40, 13);
			this.lblMsgNum.TabIndex = 12;
			this.lblMsgNum.TextAlign = System.Drawing.ContentAlignment.TopRight;
			// 
			// label5
			// 
			this.label5.Location = new System.Drawing.Point(16, 96);
			this.label5.Name = "label5";
			this.label5.Size = new System.Drawing.Size(40, 13);
			this.label5.TabIndex = 11;
			this.label5.Text = "Result:";
			// 
			// txtEncryptedMsg
			// 
			this.txtEncryptedMsg.Location = new System.Drawing.Point(208, 93);
			this.txtEncryptedMsg.Name = "txtEncryptedMsg";
			this.txtEncryptedMsg.Size = new System.Drawing.Size(48, 20);
			this.txtEncryptedMsg.TabIndex = 10;
			this.txtEncryptedMsg.Text = "";
			// 
			// cmdEncryptPrivate
			// 
			this.cmdEncryptPrivate.Enabled = false;
			this.cmdEncryptPrivate.Location = new System.Drawing.Point(152, 56);
			this.cmdEncryptPrivate.Name = "cmdEncryptPrivate";
			this.cmdEncryptPrivate.Size = new System.Drawing.Size(136, 24);
			this.cmdEncryptPrivate.TabIndex = 9;
			this.cmdEncryptPrivate.Text = "Encrypt with Private Key";
			this.cmdEncryptPrivate.Click += new System.EventHandler(this.cmdEncryptPrivate_Click);
			// 
			// cmdEncryptPublic
			// 
			this.cmdEncryptPublic.Enabled = false;
			this.cmdEncryptPublic.Location = new System.Drawing.Point(8, 56);
			this.cmdEncryptPublic.Name = "cmdEncryptPublic";
			this.cmdEncryptPublic.Size = new System.Drawing.Size(136, 24);
			this.cmdEncryptPublic.TabIndex = 3;
			this.cmdEncryptPublic.Text = "Encrypt with Public Key";
			this.cmdEncryptPublic.Click += new System.EventHandler(this.cmdEncryptPublic_Click);
			// 
			// label6
			// 
			this.label6.Location = new System.Drawing.Point(32, 32);
			this.label6.Name = "label6";
			this.label6.Size = new System.Drawing.Size(80, 13);
			this.label6.TabIndex = 8;
			this.label6.Text = "Message:";
			// 
			// txtMsgToEncrypt
			// 
			this.txtMsgToEncrypt.Location = new System.Drawing.Point(136, 24);
			this.txtMsgToEncrypt.Name = "txtMsgToEncrypt";
			this.txtMsgToEncrypt.Size = new System.Drawing.Size(48, 20);
			this.txtMsgToEncrypt.TabIndex = 1;
			this.txtMsgToEncrypt.Text = "";
			// 
			// groupBox4
			// 
			this.groupBox4.Controls.Add(this.label7);
			this.groupBox4.Controls.Add(this.label2);
			this.groupBox4.Controls.Add(this.txtPrivateCipher);
			this.groupBox4.Controls.Add(this.txtPublicCipher);
			this.groupBox4.Location = new System.Drawing.Point(344, 144);
			this.groupBox4.Name = "groupBox4";
			this.groupBox4.Size = new System.Drawing.Size(296, 296);
			this.groupBox4.TabIndex = 10;
			this.groupBox4.TabStop = false;
			this.groupBox4.Text = "Cipher list";
			// 
			// label7
			// 
			this.label7.Location = new System.Drawing.Point(152, 24);
			this.label7.Name = "label7";
			this.label7.Size = new System.Drawing.Size(80, 13);
			this.label7.TabIndex = 12;
			this.label7.Text = "Private:";
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(16, 24);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(80, 13);
			this.label2.TabIndex = 11;
			this.label2.Text = "Public:";
			// 
			// txtPrivateCipher
			// 
			this.txtPrivateCipher.Location = new System.Drawing.Point(152, 40);
			this.txtPrivateCipher.Multiline = true;
			this.txtPrivateCipher.Name = "txtPrivateCipher";
			this.txtPrivateCipher.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
			this.txtPrivateCipher.Size = new System.Drawing.Size(120, 248);
			this.txtPrivateCipher.TabIndex = 10;
			this.txtPrivateCipher.Text = "";
			// 
			// txtPublicCipher
			// 
			this.txtPublicCipher.Location = new System.Drawing.Point(16, 40);
			this.txtPublicCipher.MaxLength = 3276700;
			this.txtPublicCipher.Multiline = true;
			this.txtPublicCipher.Name = "txtPublicCipher";
			this.txtPublicCipher.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;
			this.txtPublicCipher.Size = new System.Drawing.Size(120, 248);
			this.txtPublicCipher.TabIndex = 1;
			this.txtPublicCipher.Text = "";
			// 
			// frmMain
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(656, 446);
			this.Controls.Add(this.groupBox4);
			this.Controls.Add(this.groupBox3);
			this.Controls.Add(this.groupBox2);
			this.Controls.Add(this.groupBox1);
			this.MaximizeBox = false;
			this.MinimizeBox = false;
			this.Name = "frmMain";
			this.Text = "RSA Encryption Demo";
			this.Load += new System.EventHandler(this.Form1_Load);
			this.groupBox1.ResumeLayout(false);
			this.groupBox2.ResumeLayout(false);
			this.groupBox3.ResumeLayout(false);
			this.groupBox4.ResumeLayout(false);
			this.ResumeLayout(false);

		}
		#endregion

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

		private void cmdGenerateKey_Click(object sender, System.EventArgs e)
		{
			try 
			{
				rsaEncryptor.P = Convert.ToUInt32(cboPrime1.Items[cboPrime1.SelectedIndex]);
			} 
			catch(Exception theException) 
			{
				MessageBox.Show(this, theException.Message); 
				return;
			}
			try 
			{
				rsaEncryptor.Q = Convert.ToUInt32(cboPrime2.Items[cboPrime2.SelectedIndex]);
			} 
			catch(Exception theException) 
			{
				MessageBox.Show(this, theException.Message); 
				return;
			}
			
			if(rsaEncryptor.P == rsaEncryptor.Q)
				MessageBox.Show(this, "Your key won't be very secure if n is a perfect square!  Choose a different number for your second prime.","Invalid selection",MessageBoxButtons.OK,MessageBoxIcon.Exclamation);
			richTxtKeyGenProgress.Enabled = true;			
			richTxtKeyGenProgress.Clear();
			rsaEncryptor.GenerateKeyPair(new RSAEncryptor.ProgressWriteLineDelegate(ProgressWriteLine));

			lblNvalue.Text = rsaEncryptor.N.ToString();
			lblPhiNvalue.Text = rsaEncryptor.PhiN.ToString();
			lblPublicKey.Text = String.Format("( {0}, {1} )", rsaEncryptor.N, rsaEncryptor.E);
			lblPrivateKey.Text = String.Format("( {0}, {1} )", rsaEncryptor.N, rsaEncryptor.D);

			cmdEncryptPrivate.Enabled = true;
			cmdEncryptPublic.Enabled = true;
			FillCipherTable(txtPublicCipher, new EncryptDelegate(rsaEncryptor.EncryptWithPublicKey));
			FillCipherTable(txtPrivateCipher, new EncryptDelegate(rsaEncryptor.EncryptWithPrivateKey));
		}

		private void Form1_Load(object sender, System.EventArgs e)
		{
			FillWithPrimes(cboPrime1, RSAEncryptor.MaxAllowedPrime);
			FillWithPrimes(cboPrime2, RSAEncryptor.MaxAllowedPrime);
		}

		private void cmdEncryptPublic_Click(object sender, System.EventArgs e)
		{
			ValidateAndEncrypt(txtMsgToEncrypt.Text, rsaEncryptor.E, rsaEncryptor.N, new EncryptDelegate(rsaEncryptor.EncryptWithPublicKey));			
		}

		private void cmdEncryptPrivate_Click(object sender, System.EventArgs e)
		{
			ValidateAndEncrypt(txtMsgToEncrypt.Text, rsaEncryptor.D, rsaEncryptor.N, new EncryptDelegate(rsaEncryptor.EncryptWithPrivateKey));
		}

		private void ShowEncryptionProcess(string msgNumber, uint encryptionExponent, uint N)
		{
			//Display the formula msgNumber^encryptionExponent mod N to show how the encrypted value
			// is derived
			lblMsgNum.Text = txtMsgToEncrypt.Text;
			lblEncryptionExponent.Text = encryptionExponent.ToString();
			lblMsgMod.Text = "mod " + N.ToString() + " =";
			
			//resize the labels to fit their new contents, then reposition them to close the gaps
			AutoSizeControl(lblMsgNum, 1);
			AutoSizeControl(lblEncryptionExponent, 1);
			AutoSizeControl(lblMsgMod, 1);
			lblEncryptionExponent.Left = lblMsgNum.Left + lblMsgNum.Width - 1;
			lblMsgMod.Left = lblEncryptionExponent.Left + lblEncryptionExponent.Width - 1;
		}

		private void ValidateAndEncrypt(string messageAsString, uint encryptionExponent, uint N, EncryptDelegate encryptorFunction)
		{
			uint theMessage;
			
			try 
			{
				theMessage = Convert.ToUInt32(messageAsString);
			} 
			catch(Exception) 
			{
				MessageBox.Show(this, "Please enter the integer to be encrypted"); 
				return;
			}

			uint encryptedMsg;

			try 
			{
				rsaEncryptor.ValidateMessage(theMessage);
			} 
			catch(Exception theException) 
			{
				MessageBox.Show(this, theException.Message); 
				return;
			}

			ShowEncryptionProcess(messageAsString, encryptionExponent, N); //Show them how we get the answer
			
			encryptedMsg = encryptorFunction(theMessage); //Go and get the answer

			txtEncryptedMsg.Text = encryptedMsg.ToString();
		}

		private int ProgressWriteLine(string theMessage, Color textColour)
		{
			richTxtKeyGenProgress.SelectionColor = textColour;
			richTxtKeyGenProgress.AppendText(theMessage + "\n");
			return 0;
		}

		private void FillWithPrimes(ComboBox theList, uint maxPrime)
		{
			bool[] isPrime = new bool[maxPrime + 1];
			uint i, j;

			for(i=2; i<=maxPrime; i++) isPrime[i] = true;
			for(i=2; i<=maxPrime; i++)			
				if(isPrime[i])
				{
					if(i >= 7) theList.Items.Add(i.ToString());
					for(j=i*2; j<=maxPrime; j+=i) isPrime[j] = false;
				}
		}

		private void FillCipherTable(TextBox theCipherList, EncryptDelegate encryptorFunction)
		{
			const int maxStringLen = 32767;

			uint i, p = rsaEncryptor.P, q = rsaEncryptor.Q;
			System.Text.StringBuilder listText = new System.Text.StringBuilder(maxStringLen, maxStringLen+200);
			
			theCipherList.Clear();

			for(i=2; i < rsaEncryptor.N-1 && listText.Length < maxStringLen - 4; i++)
				if((i % p != 0) && (i % q != 0))
					listText.Append(i.ToString() + " -> " + encryptorFunction(i).ToString() + System.Environment.NewLine);

			if(listText.Length >= maxStringLen-4)
				listText = listText.Remove(maxStringLen-4, listText.Length-(maxStringLen-4)).Append("...");
			theCipherList.Text = listText.ToString();
		}

		private void AutoSizeControl(Control control, int textPadding)
		{
			// Create a Graphics object for the Control
			Graphics g = control.CreateGraphics();

			// Get the Size needed to accommodate the control's formatted Text
			Size preferredSize = g.MeasureString(control.Text, control.Font).ToSize();

			// Pad the text and resize the control
			control.ClientSize = new Size(
				preferredSize.Width + textPadding, 
				preferredSize.Height + textPadding );

			g.Dispose();
		}
	}
}