(C#加密)幻术-大踲无形
首先:我看下面的代码只是知道大概的原理核心算法还是不太清楚~~有清楚的麻烦回复下谢谢咯咯
--这也是看Msdn就是把在一个图片上隐藏数据
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Text;
namespace Steganography
{
/// <summary>
/// Summary description for SteganographyForm.
/// </summary>
public class SteganographyForm : System.Windows.Forms.Form
{
private System.Windows.Forms.Button buttonHideMessage;
private System.Windows.Forms.Panel panelOriginalImage;
private System.Windows.Forms.TextBox textBoxOriginalMessage;
private System.Windows.Forms.Panel panelModifiedImage;
private System.Windows.Forms.GroupBox groupBox1;
private System.Windows.Forms.GroupBox groupBox3;
private System.Windows.Forms.GroupBox groupBox4;
private System.Windows.Forms.Button buttonExtractMessage;
private System.Windows.Forms.TextBox textBoxExtractedlMessage;
private System.Windows.Forms.GroupBox groupBox2;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public SteganographyForm()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
try
{
//load original bitmap from a file
bitmapOriginal = (Bitmap)Bitmap.FromFile(
@"..\..\katie_plaintext.jpg");
//center to screen
this.CenterToScreen( );
}
catch (Exception ex)
{
MessageBox.Show(
"Error loading image. " +
ex.Message );
}
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
Windows Form Designer generated code
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new SteganographyForm());
}
private void SteganographyForm_Paint(
object sender,
System.Windows.Forms.PaintEventArgs e)
{
try
{
//get Graphics object for painting original
Graphics gPanelOriginal =
Graphics.FromHwnd(
panelOriginalImage.Handle);
//draw original bitmap into panel
gPanelOriginal.DrawImage(
bitmapOriginal, new Point(0 ,0));
//return if there is no modified image yet
if (bitmapModified==null)
return;
//get Graphics object for painting modified
Graphics gPanelModified =
Graphics.FromHwnd(
panelModifiedImage.Handle);
//draw modified bitmap into panel
gPanelModified.DrawImage(
bitmapModified, new Point(0 ,0));
}
catch (Exception ex)
{
MessageBox.Show(
"Error drawing image." +
ex.Message);
this.Close( );
}
}
private void buttonHideMessage_Click(
object sender, System.EventArgs e)
{
try
{
//show wait cursor
this.Cursor = Cursors.WaitCursor;
//start off with copy of original image
bitmapModified = new Bitmap(
bitmapOriginal,
bitmapOriginal.Width,
bitmapOriginal.Height);
//get original message to be hidden
int numberbytes =
(byte)textBoxOriginalMessage.Text.Length;
byte[] bytesOriginal = new byte[numberbytes+1];
bytesOriginal[0] = (byte)numberbytes;
Encoding.UTF8.GetBytes(
textBoxOriginalMessage.Text,
0,
textBoxOriginalMessage.Text.Length,
bytesOriginal,
1);
//set bits 1, 2, 3 of byte into LSB red
//set bits 4, 5, 6 of byte into LSB green
//set bits 7 and 8 of byte into LSB blue
int byteCount = 0;//----一列一列搞定
for (int i=0; i<bitmapOriginal.Width; i++)
{
for (int j=0; j<bitmapOriginal.Height; j++)
{
if (bytesOriginal.Length==byteCount)
return;
//---返回当前循环的坐标点的颜色数据
Color clrPixelOriginal =
bitmapOriginal.GetPixel(i, j);
//为基元整型类型、枚举类型和 boolean 类型预定义了二元 | 运算符。对于基元整型类型和枚举类型，| 计算操作数的按位“或”。
//--注意这里是对~~血迹之术-的实际应用中的变种
//--这里的算法还是不太清楚估计是-防止三元素重合成1点后产生的错位--如果大大们知道麻烦告诉我下
byte r =
(byte)((clrPixelOriginal.R & ~0x7) |
(bytesOriginal[byteCount]>>0)&0x7);
byte g =
(byte)((clrPixelOriginal.G & ~0x7) |
(bytesOriginal[byteCount]>>3)&0x7);
byte b =
(byte)((clrPixelOriginal.B & ~0x3) |
(bytesOriginal[byteCount]>>6)&0x3);
byteCount++;
//set pixel to modified color
bitmapModified.SetPixel(
i, j, Color.FromArgb(r, g, b));
}
}
}
catch (Exception ex)
{
MessageBox.Show(
"Error hiding message." +
ex.Message);
}
finally
{
//show normal cursor
this.Cursor = Cursors.Arrow;
//repaint
Invalidate();
}
}
private void buttonExtractMessage_Click(
object sender, System.EventArgs e)
{
//get bytes of message from modified image
byte[] bytesExtracted = new byte [256+1];
try
{
//show wait cursor, can be time-consuming
this.Cursor = Cursors.WaitCursor;
//get bits 1, 2, 3 of byte from LSB red
//get bits 4, 5, 6 of byte from LSB green
//get bits 7 and 8 of byte from LSB blue
int byteCount = 0;
for (int i=0; i<bitmapModified.Width; i++)
{
for (int j=0; j<bitmapModified.Height; j++)
{
if (bytesExtracted.Length==byteCount)
return;
Color clrPixelModified =
bitmapModified.GetPixel(i, j);
byte bits123 =
(byte)((clrPixelModified.R&0x7)<<0);
byte bits456 = (
byte)((clrPixelModified.G&0x7)<<3);
byte bits78 = (
byte)((clrPixelModified.B&0x3)<<6);
bytesExtracted[byteCount] =
(byte)(bits78 |bits456 | bits123);
byteCount++;
}
}
}
catch (Exception ex)
{
MessageBox.Show(
"Error extracting message." +
ex.Message);
}
finally
{
//show normal cursor
this.Cursor = Cursors.Arrow;
//get number of bytes from start of array
int numberbytes = bytesExtracted[0];
//get remaining bytes in array into string
textBoxExtractedlMessage.Text =
Encoding.UTF8.GetString(
bytesExtracted,
1,
numberbytes);
}
}
//shared private fields
private Bitmap bitmapOriginal;
private Bitmap bitmapModified;
}
}
--这也是看Msdn就是把在一个图片上隐藏数据
using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using System.Text; namespace Steganography{
/// <summary> /// Summary description for SteganographyForm. /// </summary> public class SteganographyForm : System.Windows.Forms.Form { private System.Windows.Forms.Button buttonHideMessage; private System.Windows.Forms.Panel panelOriginalImage; private System.Windows.Forms.TextBox textBoxOriginalMessage; private System.Windows.Forms.Panel panelModifiedImage; private System.Windows.Forms.GroupBox groupBox1; private System.Windows.Forms.GroupBox groupBox3; private System.Windows.Forms.GroupBox groupBox4; private System.Windows.Forms.Button buttonExtractMessage; private System.Windows.Forms.TextBox textBoxExtractedlMessage; private System.Windows.Forms.GroupBox groupBox2; /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.Container components = null; public SteganographyForm() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // try { //load original bitmap from a file bitmapOriginal = (Bitmap)Bitmap.FromFile( @"..\..\katie_plaintext.jpg"); //center to screen this.CenterToScreen( ); } catch (Exception ex) { MessageBox.Show( "Error loading image. " + ex.Message ); } } /// <summary> /// Clean up any resources being used. /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } Windows Form Designer generated code /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { Application.Run(new SteganographyForm()); } private void SteganographyForm_Paint( object sender, System.Windows.Forms.PaintEventArgs e) { try { //get Graphics object for painting original Graphics gPanelOriginal = Graphics.FromHwnd( panelOriginalImage.Handle); //draw original bitmap into panel gPanelOriginal.DrawImage( bitmapOriginal, new Point(0 ,0)); //return if there is no modified image yet if (bitmapModified==null) return; //get Graphics object for painting modified Graphics gPanelModified = Graphics.FromHwnd( panelModifiedImage.Handle); //draw modified bitmap into panel gPanelModified.DrawImage( bitmapModified, new Point(0 ,0)); } catch (Exception ex) { MessageBox.Show( "Error drawing image." + ex.Message); this.Close( ); } } private void buttonHideMessage_Click( object sender, System.EventArgs e) { try { //show wait cursor this.Cursor = Cursors.WaitCursor; //start off with copy of original image bitmapModified = new Bitmap( bitmapOriginal, bitmapOriginal.Width, bitmapOriginal.Height); //get original message to be hidden int numberbytes = (byte)textBoxOriginalMessage.Text.Length; byte[] bytesOriginal = new byte[numberbytes+1]; bytesOriginal[0] = (byte)numberbytes; Encoding.UTF8.GetBytes( textBoxOriginalMessage.Text, 0, textBoxOriginalMessage.Text.Length, bytesOriginal, 1); //set bits 1, 2, 3 of byte into LSB red //set bits 4, 5, 6 of byte into LSB green //set bits 7 and 8 of byte into LSB blue int byteCount = 0;//----一列一列搞定 for (int i=0; i<bitmapOriginal.Width; i++) { for (int j=0; j<bitmapOriginal.Height; j++) { if (bytesOriginal.Length==byteCount) return; //---返回当前循环的坐标点的颜色数据 Color clrPixelOriginal = bitmapOriginal.GetPixel(i, j); //为基元整型类型、枚举类型和 boolean 类型预定义了二元 | 运算符。对于基元整型类型和枚举类型，| 计算操作数的按位“或”。 //--注意这里是对~~血迹之术-的实际应用中的变种 //--这里的算法还是不太清楚估计是-防止三元素重合成1点后产生的错位--如果大大们知道麻烦告诉我下 byte r = (byte)((clrPixelOriginal.R & ~0x7) | (bytesOriginal[byteCount]>>0)&0x7); byte g = (byte)((clrPixelOriginal.G & ~0x7) | (bytesOriginal[byteCount]>>3)&0x7); byte b = (byte)((clrPixelOriginal.B & ~0x3) | (bytesOriginal[byteCount]>>6)&0x3); byteCount++; //set pixel to modified color bitmapModified.SetPixel( i, j, Color.FromArgb(r, g, b)); } } } catch (Exception ex) { MessageBox.Show( "Error hiding message." + ex.Message); } finally { //show normal cursor this.Cursor = Cursors.Arrow; //repaint Invalidate(); } } private void buttonExtractMessage_Click( object sender, System.EventArgs e) { //get bytes of message from modified image byte[] bytesExtracted = new byte [256+1]; try { //show wait cursor, can be time-consuming this.Cursor = Cursors.WaitCursor; //get bits 1, 2, 3 of byte from LSB red //get bits 4, 5, 6 of byte from LSB green //get bits 7 and 8 of byte from LSB blue int byteCount = 0; for (int i=0; i<bitmapModified.Width; i++) { for (int j=0; j<bitmapModified.Height; j++) { if (bytesExtracted.Length==byteCount) return; Color clrPixelModified = bitmapModified.GetPixel(i, j); byte bits123 = (byte)((clrPixelModified.R&0x7)<<0); byte bits456 = ( byte)((clrPixelModified.G&0x7)<<3); byte bits78 = ( byte)((clrPixelModified.B&0x3)<<6); bytesExtracted[byteCount] = (byte)(bits78 |bits456 | bits123); byteCount++; } } } catch (Exception ex) { MessageBox.Show( "Error extracting message." + ex.Message); } finally { //show normal cursor this.Cursor = Cursors.Arrow; //get number of bytes from start of array int numberbytes = bytesExtracted[0]; //get remaining bytes in array into string textBoxExtractedlMessage.Text = Encoding.UTF8.GetString( bytesExtracted, 1, numberbytes); } } //shared private fields private Bitmap bitmapOriginal; private Bitmap bitmapModified; }}
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