using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Security;
using System.Security.Cryptography;
using System.IO;
using System.Text;
namespace CryptoSampleCS{
public class frmEncryptionSigning : System.Windows.Forms.Form{
#region "Datamember"
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox txtOrigData;
private System.Windows.Forms.TextBox txtAlteredData;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.TextBox txtData;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.TextBox txtSignature;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Label label5;
private System.ComponentModel.Container components = null;
byte [] m_originalData;
byte [] m_alteredData;
byte [] m_signature;
private System.Windows.Forms.Button btnSignData;
private System.Windows.Forms.Button btnVerify;
private System.Windows.Forms.Button btnVerifyAltered;
private System.Windows.Forms.Button btnEncrypt;
private System.Windows.Forms.Button btnDecrypt;
RSACryptoServiceProvider m_RSA;
private System.Windows.Forms.TextBox txtEncrypted;
private System.Windows.Forms.Label label6;
private System.Windows.Forms.Label label7;
private System.Windows.Forms.Label label8;
bool m_blsignature = false;
#endregion
#region "ctor"
public frmEncryptionSigning(){
InitializeComponent();
}
#endregion
#region "dtor"
protected override void Dispose( bool disposing ){
if( disposing ){
if(components != null){
components.Dispose();
}
}
base.Dispose( disposing );
}
#endregion
#region Vom Windows Form-Designer generierter Code
/// <summary>
/// Erforderliche Methode für die Designerunterstützung.
/// Der Inhalt der Methode darf nicht mit dem Code-Editor geändert werden.
/// </summary>
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.txtOrigData = new System.Windows.Forms.TextBox();
this.txtAlteredData = new System.Windows.Forms.TextBox();
this.label3 = new System.Windows.Forms.Label();
this.txtData = new System.Windows.Forms.TextBox();
this.label4 = new System.Windows.Forms.Label();
this.txtSignature = new System.Windows.Forms.TextBox();
this.button1 = new System.Windows.Forms.Button();
this.btnSignData = new System.Windows.Forms.Button();
this.btnVerify = new System.Windows.Forms.Button();
this.btnVerifyAltered = new System.Windows.Forms.Button();
this.btnEncrypt = new System.Windows.Forms.Button();
this.btnDecrypt = new System.Windows.Forms.Button();
this.label5 = new System.Windows.Forms.Label();
this.txtEncrypted = new System.Windows.Forms.TextBox();
this.label6 = new System.Windows.Forms.Label();
this.label7 = new System.Windows.Forms.Label();
this.label8 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// label1
//
this.label1.Location = new System.Drawing.Point(16, 384);
this.label1.Name = "label1";
this.label1.TabIndex = 0;
this.label1.Text = "Original Daten";
//
// label2
//
this.label2.Location = new System.Drawing.Point(256, 384);
this.label2.Name = "label2";
this.label2.TabIndex = 1;
this.label2.Text = "Veränderte Daten";
//
// txtOrigData
//
this.txtOrigData.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.txtOrigData.Location = new System.Drawing.Point(16, 408);
this.txtOrigData.Multiline = true;
this.txtOrigData.Name = "txtOrigData";
this.txtOrigData.ReadOnly = true;
this.txtOrigData.Size = new System.Drawing.Size(232, 152);
this.txtOrigData.TabIndex = 2;
this.txtOrigData.Text = "";
//
// txtAlteredData
//
this.txtAlteredData.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.txtAlteredData.Location = new System.Drawing.Point(256, 408);
this.txtAlteredData.Multiline = true;
this.txtAlteredData.Name = "txtAlteredData";
this.txtAlteredData.ReadOnly = true;
this.txtAlteredData.Size = new System.Drawing.Size(248, 152);
this.txtAlteredData.TabIndex = 3;
this.txtAlteredData.Text = "";
//
// label3
//
this.label3.Location = new System.Drawing.Point(8, 16);
this.label3.Name = "label3";
this.label3.TabIndex = 4;
this.label3.Text = "Daten";
//
// txtData
//
this.txtData.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.txtData.Location = new System.Drawing.Point(8, 48);
this.txtData.Multiline = true;
this.txtData.Name = "txtData";
this.txtData.Size = new System.Drawing.Size(312, 160);
this.txtData.TabIndex = 5;
this.txtData.Text = "";
this.txtData.Validated += new System.EventHandler(this.txtData_Validated);
//
// label4
//
this.label4.Location = new System.Drawing.Point(512, 384);
this.label4.Name = "label4";
this.label4.TabIndex = 6;
this.label4.Text = "Datensignatur";
//
// txtSignature
//
this.txtSignature.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.txtSignature.Location = new System.Drawing.Point(512, 408);
this.txtSignature.Multiline = true;
this.txtSignature.Name = "txtSignature";
this.txtSignature.ReadOnly = true;
this.txtSignature.Size = new System.Drawing.Size(352, 152);
this.txtSignature.TabIndex = 7;
this.txtSignature.Text = "";
//
// button1
//
this.button1.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.button1.Location = new System.Drawing.Point(176, 240);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(168, 40);
this.button1.TabIndex = 8;
this.button1.Text = "Erzeuge Public/Private Key";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// btnSignData
//
this.btnSignData.Enabled = false;
this.btnSignData.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.btnSignData.Location = new System.Drawing.Point(176, 280);
this.btnSignData.Name = "btnSignData";
this.btnSignData.Size = new System.Drawing.Size(168, 40);
this.btnSignData.TabIndex = 9;
this.btnSignData.Text = "Signiere Daten";
this.btnSignData.Click += new System.EventHandler(this.btnSignData_Click);
//
// btnVerify
//
this.btnVerify.Enabled = false;
this.btnVerify.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.btnVerify.Location = new System.Drawing.Point(344, 240);
this.btnVerify.Name = "btnVerify";
this.btnVerify.Size = new System.Drawing.Size(200, 40);
this.btnVerify.TabIndex = 10;
this.btnVerify.Text = "Verifiziere Originale Daten";
this.btnVerify.Click += new System.EventHandler(this.btnVerify_Click);
//
// btnVerifyAltered
//
this.btnVerifyAltered.Enabled = false;
this.btnVerifyAltered.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.btnVerifyAltered.Location = new System.Drawing.Point(344, 280);
this.btnVerifyAltered.Name = "btnVerifyAltered";
this.btnVerifyAltered.Size = new System.Drawing.Size(200, 40);
this.btnVerifyAltered.TabIndex = 11;
this.btnVerifyAltered.Text = "Verifiziere Veränderte Daten";
this.btnVerifyAltered.Click += new System.EventHandler(this.btnVerifyAltered_Click);
//
// btnEncrypt
//
this.btnEncrypt.Enabled = false;
this.btnEncrypt.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.btnEncrypt.Location = new System.Drawing.Point(544, 240);
this.btnEncrypt.Name = "btnEncrypt";
this.btnEncrypt.Size = new System.Drawing.Size(152, 40);
this.btnEncrypt.TabIndex = 12;
this.btnEncrypt.Text = "Verschlüsseln";
this.btnEncrypt.Click += new System.EventHandler(this.btnEncrypt_Click);
//
// btnDecrypt
//
this.btnDecrypt.Enabled = false;
this.btnDecrypt.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.btnDecrypt.Location = new System.Drawing.Point(544, 280);
this.btnDecrypt.Name = "btnDecrypt";
this.btnDecrypt.Size = new System.Drawing.Size(152, 40);
this.btnDecrypt.TabIndex = 13;
this.btnDecrypt.Text = "Entschlüsseln";
this.btnDecrypt.Click += new System.EventHandler(this.btnDecrypt_Click);
//
// label5
//
this.label5.Location = new System.Drawing.Point(416, 8);
this.label5.Name = "label5";
this.label5.Size = new System.Drawing.Size(120, 23);
this.label5.TabIndex = 14;
this.label5.Text = "Verschlüsselte Daten";
//
// txtEncrypted
//
this.txtEncrypted.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.txtEncrypted.Location = new System.Drawing.Point(416, 40);
this.txtEncrypted.Multiline = true;
this.txtEncrypted.Name = "txtEncrypted";
this.txtEncrypted.ReadOnly = true;
this.txtEncrypted.Size = new System.Drawing.Size(360, 168);
this.txtEncrypted.TabIndex = 15;
this.txtEncrypted.Text = "";
//
// label6
//
this.label6.Location = new System.Drawing.Point(152, 248);
this.label6.Name = "label6";
this.label6.Size = new System.Drawing.Size(24, 23);
this.label6.TabIndex = 16;
this.label6.Text = "1.";
//
// label7
//
this.label7.Location = new System.Drawing.Point(320, 88);
this.label7.Name = "label7";
this.label7.Size = new System.Drawing.Size(16, 23);
this.label7.TabIndex = 17;
this.label7.Text = "2.";
//
// label8
//
this.label8.Location = new System.Drawing.Point(152, 288);
this.label8.Name = "label8";
this.label8.Size = new System.Drawing.Size(8, 23);
this.label8.TabIndex = 18;
this.label8.Text = "3.";
//
// frmEncryptionSigning
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(888, 582);
this.Controls.Add(this.label8);
this.Controls.Add(this.label7);
this.Controls.Add(this.label6);
this.Controls.Add(this.txtEncrypted);
this.Controls.Add(this.label5);
this.Controls.Add(this.btnDecrypt);
this.Controls.Add(this.btnEncrypt);
this.Controls.Add(this.btnVerifyAltered);
this.Controls.Add(this.btnVerify);
this.Controls.Add(this.btnSignData);
this.Controls.Add(this.button1);
this.Controls.Add(this.txtSignature);
this.Controls.Add(this.label4);
this.Controls.Add(this.txtData);
this.Controls.Add(this.label3);
this.Controls.Add(this.txtAlteredData);
this.Controls.Add(this.txtOrigData);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Name = "frmEncryptionSigning";
this.Text = "Encryption/ Data Signing";
this.ResumeLayout(false);
}
#endregion
private void button1_Click(object sender, System.EventArgs e) {
RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();//RSACryptoServiceProvider(4096):=Schlüsseltiefe auf 4096
System.IO.StreamWriter strWrFullKey = new StreamWriter(Application.StartupPath.ToString()+ System.IO.Path.DirectorySeparatorChar + "FullKey.xml");
strWrFullKey.Write(RSA.ToXmlString(true));
strWrFullKey.Close();
System.IO.StreamWriter strWrPubKey = new StreamWriter(Application.StartupPath.ToString() + System.IO.Path.DirectorySeparatorChar + "PublicKey.xml");
strWrPubKey.Write(RSA.ToXmlString(false));
strWrPubKey.Close();
MessageBox.Show("Keys wurden erzeugt und in XML Files abgelegt!");
this.m_blsignature = true;
}
private void txtData_Validated(object sender, System.EventArgs e) {
if ( !this.txtData.Text.Equals(string.Empty) ){
UnicodeEncoding ByteConverter = new UnicodeEncoding();
this.m_originalData = ByteConverter.GetBytes(this.txtData.Text);
this.txtOrigData.Text = this.formatBytes(this.m_originalData);
this.m_alteredData = new byte[this.m_originalData.Length];
this.m_originalData.CopyTo(this.m_alteredData, 0);
this.m_alteredData[0] = 42;
this.txtAlteredData.Text = this.formatBytes( this.m_alteredData );
if ( this.m_blsignature ) {
this.btnSignData.Enabled = true;
}
else{
this.btnSignData.Enabled = false;
}
}
this.btnEncrypt.Enabled = true;
this.btnDecrypt.Enabled = false;
this.btnVerify.Enabled = false;
this.btnVerifyAltered.Enabled = false;
}
private string formatBytes(byte[] data) {
StringBuilder output = new StringBuilder();
for (int i = 0; i < data.Length; i++) {
output.Append(" " + data[i].ToString("X2"));
if ((i % 8 == 7) && (i < data.Length - 1))
output.Append("\r\n");
}
return output.ToString();
}
private void btnSignData_Click(object sender, System.EventArgs e) {
this.m_RSA = new RSACryptoServiceProvider();
System.IO.StreamReader srRdPubKey = new StreamReader(Application.StartupPath.ToString() + System.IO.Path.DirectorySeparatorChar + "FullKey.xml");
string pubKey = srRdPubKey.ReadToEnd();
srRdPubKey.Close();
this.m_RSA.FromXmlString(pubKey);
this.m_signature= this.m_RSA.SignData(this.m_originalData, "SHA1");
this.txtSignature.Text = this.formatBytes(this.m_signature);
MessageBox.Show("Signatur wurde erfolgreich erzeugt!");
this.btnVerify.Enabled = true;
this.btnVerifyAltered.Enabled = true;
}
private void btnEncrypt_Click(object sender, System.EventArgs e) {
this.m_RSA = new RSACryptoServiceProvider();
System.IO.StreamReader srRdPubKey = new StreamReader(Application.StartupPath.ToString() + System.IO.Path.DirectorySeparatorChar + "PublicKey.xml");
string pubKey = srRdPubKey.ReadToEnd();
srRdPubKey.Close();
this.m_RSA.FromXmlString(pubKey);
this.txtEncrypted.Text = Convert.ToBase64String(this.m_RSA.Encrypt(this.m_originalData,false) );
this.txtData.Text = string.Empty;
this.btnEncrypt.Enabled = false;
this.btnDecrypt.Enabled = true;
}
private void btnDecrypt_Click(object sender, System.EventArgs e) {
this.m_RSA = new RSACryptoServiceProvider();
System.IO.StreamReader srRdFulley = new StreamReader(Application.StartupPath.ToString() + System.IO.Path.DirectorySeparatorChar + "FullKey.xml");
string fullKey = srRdFulley.ReadToEnd();
srRdFulley.Close();
this.m_RSA.FromXmlString(fullKey);
byte[] byt;
UnicodeEncoding ByteConverter = new UnicodeEncoding();
byt = Convert.FromBase64String( this.txtEncrypted.Text);
byte[] original = this.m_RSA.Decrypt(byt,false);
this.txtData.Text = ByteConverter.GetString(original);
this.btnDecrypt.Enabled = false;
this.btnEncrypt.Enabled = true;
this.txtEncrypted.Text = string.Empty;
}
private void btnVerify_Click(object sender, System.EventArgs e) {
if (this.m_signature != null) {
this.m_RSA = new RSACryptoServiceProvider();
System.IO.StreamReader srRdPubKey = new StreamReader(Application.StartupPath.ToString() + System.IO.Path.DirectorySeparatorChar + "PublicKey.xml");
string pubKey = srRdPubKey.ReadToEnd();
srRdPubKey.Close();
this.m_RSA.FromXmlString(pubKey);
bool result = this.m_RSA.VerifyData( this.m_originalData,"SHA1", this.m_signature);
if (result){
MessageBox.Show("Daten wurden erfolgreich gegen die Signatur verifiziert");
}
else{
MessageBox.Show("Daten konnten nicht erfolgreich gegen die Signatur verifiziert werden.");
}
}
else{
MessageBox.Show("Keine signatur gefunden!");
}
}
private void btnVerifyAltered_Click(object sender, System.EventArgs e) {
if (this.m_signature != null) {
this.m_RSA = new RSACryptoServiceProvider();
System.IO.StreamReader srRdPubKey = new StreamReader(Application.StartupPath.ToString() + System.IO.Path.DirectorySeparatorChar + "PublicKey.xml");
string pubKey = srRdPubKey.ReadToEnd();
srRdPubKey.Close();
this.m_RSA.FromXmlString(pubKey);
bool result = this.m_RSA.VerifyData( this.m_alteredData,"SHA1", this.m_signature);
if (result){
MessageBox.Show("Daten wurden erfolgreich gegen die Signatur verifiziert");
}
else{
MessageBox.Show("Daten konnten nicht erfolgreich gegen die Signatur verifiziert werden.");
}
}
else{
MessageBox.Show("Keine signatur gefunden!");
}
}
[STAThread]
static void Main() {
Application.EnableVisualStyles();
Application.Run(new frmEncryptionSigning());
}
}
}
