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FrmSteganography.cs
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FrmSteganography.cs
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using System;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
namespace Text2Image
{
public partial class FrmSteganography : Form
{
public FrmSteganography()
{
InitializeComponent();
}
//public values:
string loadedTrueImagePath, loadedFilePath, saveToImage,DLoadImagePath,DSaveFilePath;
int height, width;
long fileSize, fileNameSize;
Image loadedTrueImage, DecryptedImage ,AfterEncryption;
Bitmap loadedTrueBitmap, DecryptedBitmap;
Rectangle previewImage = new Rectangle(20,160,490,470);
bool canPaint = false, EncriptionDone = false;
byte[] fileContainer;
private void EnImageBrowse_btn_Click(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
loadedTrueImagePath = openFileDialog1.FileName;
EnImage_tbx.Text = loadedTrueImagePath;
loadedTrueImage = Image.FromFile(loadedTrueImagePath);
height = loadedTrueImage.Height;
width = loadedTrueImage.Width;
loadedTrueBitmap = new Bitmap(loadedTrueImage);
FileInfo imginf = new FileInfo(loadedTrueImagePath);
float fs = (float)imginf.Length / 1024;
ImageSize_lbl.Text = smalldecimal(fs.ToString(), 2) + " KB";
ImageHeight_lbl.Text = loadedTrueImage.Height.ToString() + " Pixel";
ImageWidth_lbl.Text = loadedTrueImage.Width.ToString() + " Pixel";
double cansave = (8.0 * ((height * (width / 3) * 3) / 3 - 1)) / 1024;
CanSave_lbl.Text = smalldecimal(cansave.ToString(), 2) + " KB";
canPaint = true;
this.Invalidate();
}
}
private string smalldecimal(string inp, int dec)
{
int i;
for (i = inp.Length - 1; i > 0; i--)
if (inp[i] == '.')
break;
try
{
return inp.Substring(0, i + dec + 1);
}
catch
{
return inp;
}
}
private void EnFileBrowse_btn_Click(object sender, EventArgs e)
{
if (openFileDialog2.ShowDialog() == DialogResult.OK)
{
loadedFilePath = openFileDialog2.FileName;
EnFile_tbx.Text = loadedFilePath;
FileInfo finfo = new FileInfo(loadedFilePath);
fileSize = finfo.Length;
fileNameSize = justFName(loadedFilePath).Length;
}
}
private void Encrypt_btn_Click(object sender, EventArgs e)
{
if (saveFileDialog1.ShowDialog() == DialogResult.OK)
{
saveToImage = saveFileDialog1.FileName;
}
else
return;
if (EnImage_tbx.Text == String.Empty || EnFile_tbx.Text == String.Empty)
{
MessageBox.Show("Encrypton information is incomplete!\nPlease complete them frist.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
if (8*((height * (width/3)*3)/3 - 1) < fileSize + fileNameSize)
{
MessageBox.Show("File size is too large!\nPlease use a larger image to hide this file.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
fileContainer = File.ReadAllBytes(loadedFilePath);
EncryptLayer();
}
private void EncryptLayer()
{
toolStripStatusLabel1.Text ="Encrypting... Please wait";
Application.DoEvents();
long FSize = fileSize;
Bitmap changedBitmap = EncryptLayer(8, loadedTrueBitmap, 0, (height * (width/3)*3) / 3 - fileNameSize - 1, true);
FSize -= (height * (width / 3) * 3) / 3 - fileNameSize - 1;
if(FSize > 0)
{
for (int i = 7; i >= 0 && FSize > 0; i--)
{
changedBitmap = EncryptLayer(i, changedBitmap, (((8 - i) * height * (width / 3) * 3) / 3 - fileNameSize - (8 - i)), (((9 - i) * height * (width / 3) * 3) / 3 - fileNameSize - (9 - i)), false);
FSize -= (height * (width / 3) * 3) / 3 - 1;
}
}
changedBitmap.Save(saveToImage);
toolStripStatusLabel1.Text = "Encrypted image has been successfully saved.";
EncriptionDone = true;
AfterEncryption = Image.FromFile(saveToImage);
this.Invalidate();
}
private Bitmap EncryptLayer(int layer, Bitmap inputBitmap, long startPosition, long endPosition, bool writeFileName)
{
Bitmap outputBitmap = inputBitmap;
layer--;
int i = 0, j = 0;
long FNSize = 0;
bool[] t = new bool[8];
bool[] rb = new bool[8];
bool[] gb = new bool[8];
bool[] bb = new bool[8];
Color pixel = new Color();
byte r, g, b;
if (writeFileName)
{
FNSize = fileNameSize;
string fileName = justFName(loadedFilePath);
//write fileName:
for (i = 0; i < height && i * (height / 3) < fileNameSize; i++)
for (j = 0; j < (width / 3) * 3 && i * (height / 3) + (j / 3) < fileNameSize; j++)
{
byte2bool((byte)fileName[i * (height / 3) + j / 3], ref t);
pixel = inputBitmap.GetPixel(j, i);
r = pixel.R;
g = pixel.G;
b = pixel.B;
byte2bool(r, ref rb);
byte2bool(g, ref gb);
byte2bool(b, ref bb);
if (j % 3 == 0)
{
rb[7] = t[0];
gb[7] = t[1];
bb[7] = t[2];
}
else if (j % 3 == 1)
{
rb[7] = t[3];
gb[7] = t[4];
bb[7] = t[5];
}
else
{
rb[7] = t[6];
gb[7] = t[7];
}
Color result = Color.FromArgb((int)bool2byte(rb), (int)bool2byte(gb), (int)bool2byte(bb));
outputBitmap.SetPixel(j, i, result);
}
i--;
}
//write file (after file name):
int tempj = j;
for (; i < height && i * (height / 3) < endPosition - startPosition + FNSize && startPosition + i * (height / 3) < fileSize + FNSize; i++)
for (j = 0; j < (width / 3) * 3 && i * (height / 3) + (j / 3) < endPosition - startPosition + FNSize && startPosition + i * (height / 3) + (j / 3) < fileSize + FNSize; j++)
{
if (tempj != 0)
{
j = tempj;
tempj = 0;
}
byte2bool((byte)fileContainer[startPosition + i * (height / 3) + j / 3 - FNSize], ref t);
pixel = inputBitmap.GetPixel(j, i);
r = pixel.R;
g = pixel.G;
b = pixel.B;
byte2bool(r, ref rb);
byte2bool(g, ref gb);
byte2bool(b, ref bb);
if (j % 3 == 0)
{
rb[layer] = t[0];
gb[layer] = t[1];
bb[layer] = t[2];
}
else if (j % 3 == 1)
{
rb[layer] = t[3];
gb[layer] = t[4];
bb[layer] = t[5];
}
else
{
rb[layer] = t[6];
gb[layer] = t[7];
}
Color result = Color.FromArgb((int)bool2byte(rb), (int)bool2byte(gb), (int)bool2byte(bb));
outputBitmap.SetPixel(j, i, result);
}
long tempFS = fileSize, tempFNS = fileNameSize;
r = (byte)(tempFS % 100);
tempFS /= 100;
g = (byte)(tempFS % 100);
tempFS /= 100;
b = (byte)(tempFS % 100);
Color flenColor = Color.FromArgb(r,g,b);
outputBitmap.SetPixel(width - 1, height - 1, flenColor);
r = (byte)(tempFNS % 100);
tempFNS /= 100;
g = (byte)(tempFNS % 100);
tempFNS /= 100;
b = (byte)(tempFNS % 100);
Color fnlenColor = Color.FromArgb(r,g,b);
outputBitmap.SetPixel(width - 2, height - 1, fnlenColor);
return outputBitmap;
}
private void DecryptLayer()
{
toolStripStatusLabel1.Text = "Decrypting... Please wait";
Application.DoEvents();
int i, j = 0;
bool[] t = new bool[8];
bool[] rb = new bool[8];
bool[] gb = new bool[8];
bool[] bb = new bool[8];
Color pixel = new Color();
byte r, g, b;
pixel = DecryptedBitmap.GetPixel(width - 1, height - 1);
long fSize = pixel.R + pixel.G * 100 + pixel.B * 10000;
pixel = DecryptedBitmap.GetPixel(width - 2, height - 1);
long fNameSize = pixel.R + pixel.G * 100 + pixel.B * 10000;
byte[] res = new byte[fSize];
string resFName = "";
byte temp;
//Read file name:
for (i = 0; i < height && i * (height / 3) < fNameSize; i++)
for (j = 0; j < (width / 3) * 3 && i * (height / 3) + (j / 3) < fNameSize; j++)
{
pixel = DecryptedBitmap.GetPixel(j, i);
r = pixel.R;
g = pixel.G;
b = pixel.B;
byte2bool(r, ref rb);
byte2bool(g, ref gb);
byte2bool(b, ref bb);
if (j % 3 == 0)
{
t[0] = rb[7];
t[1] = gb[7];
t[2] = bb[7];
}
else if (j % 3 == 1)
{
t[3] = rb[7];
t[4] = gb[7];
t[5] = bb[7];
}
else
{
t[6] = rb[7];
t[7] = gb[7];
temp = bool2byte(t);
resFName += (char)temp;
}
}
//Read file on layer 8 (after file name):
int tempj = j;
i--;
for (; i < height && i * (height / 3) < fSize + fNameSize; i++)
for (j = 0; j < (width / 3) * 3 && i * (height / 3) + (j / 3) < (height * (width / 3) * 3) / 3 - 1 && i * (height / 3) + (j / 3) < fSize + fNameSize; j++)
{
if (tempj != 0)
{
j = tempj;
tempj = 0;
}
pixel = DecryptedBitmap.GetPixel(j, i);
r = pixel.R;
g = pixel.G;
b = pixel.B;
byte2bool(r, ref rb);
byte2bool(g, ref gb);
byte2bool(b, ref bb);
if (j % 3 == 0)
{
t[0] = rb[7];
t[1] = gb[7];
t[2] = bb[7];
}
else if (j % 3 == 1)
{
t[3] = rb[7];
t[4] = gb[7];
t[5] = bb[7];
}
else
{
t[6] = rb[7];
t[7] = gb[7];
temp = bool2byte(t);
res[i * (height / 3) + j / 3 - fNameSize] = temp;
}
}
//Read file on other layers:
long readedOnL8 = (height * (width/3)*3) /3 - fNameSize - 1;
for (int layer = 6; layer >= 0 && readedOnL8 + (6 - layer) * ((height * (width / 3) * 3) / 3 - 1) < fSize; layer--)
for (i = 0; i < height && i * (height / 3) + readedOnL8 + (6 - layer) * ((height * (width / 3) * 3) / 3 - 1) < fSize; i++)
for (j = 0; j < (width / 3) * 3 && i * (height / 3) + (j / 3) + readedOnL8 + (6 - layer) * ((height * (width / 3) * 3) / 3 - 1) < fSize; j++)
{
pixel = DecryptedBitmap.GetPixel(j, i);
r = pixel.R;
g = pixel.G;
b = pixel.B;
byte2bool(r, ref rb);
byte2bool(g, ref gb);
byte2bool(b, ref bb);
if (j % 3 == 0)
{
t[0] = rb[layer];
t[1] = gb[layer];
t[2] = bb[layer];
}
else if (j % 3 == 1)
{
t[3] = rb[layer];
t[4] = gb[layer];
t[5] = bb[layer];
}
else
{
t[6] = rb[layer];
t[7] = gb[layer];
temp = bool2byte(t);
res[i * (height / 3) + j / 3 + (6 - layer) * ((height * (width / 3) * 3) / 3 - 1) + readedOnL8] = temp;
}
}
if (File.Exists(DSaveFilePath + "\\" + resFName))
{
MessageBox.Show("File \"" + resFName + "\" already exist please choose another path to save file", "Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
return;
}
else
File.WriteAllBytes(DSaveFilePath + "\\" + resFName, res);
toolStripStatusLabel1.Text = "Decrypted file has been successfully saved.";
Application.DoEvents();
}
private void byte2bool(byte inp, ref bool[] outp)
{
if(inp>=0 && inp<=255)
for (short i = 7; i >= 0; i--)
{
if (inp % 2 == 1)
outp[i] = true;
else
outp[i] = false;
inp /= 2;
}
else
throw new Exception("Input number is illegal.");
}
private byte bool2byte(bool[] inp)
{
byte outp = 0;
for (short i = 7; i >= 0; i--)
{
if (inp[i])
outp += (byte)Math.Pow(2.0, (double)(7-i));
}
return outp;
}
private void Decrypt_btn_Click(object sender, EventArgs e)
{
if (DeSaveFile_tbx.Text == String.Empty || DeLoadImage_tbx.Text == String.Empty)
{
MessageBox.Show("Text boxes must not be empty!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
if (System.IO.File.Exists(DeLoadImage_tbx.Text) == false)
{
MessageBox.Show("Select image file.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
DeLoadImage_tbx.Focus();
return;
}
DecryptLayer();
}
private void DeLoadImageBrowse_btn_Click(object sender, EventArgs e)
{
if (openFileDialog3.ShowDialog() == DialogResult.OK)
{
DLoadImagePath = openFileDialog3.FileName;
DeLoadImage_tbx.Text = DLoadImagePath;
DecryptedImage = Image.FromFile(DLoadImagePath);
height = DecryptedImage.Height;
width = DecryptedImage.Width;
DecryptedBitmap = new Bitmap(DecryptedImage);
FileInfo imginf = new FileInfo(DLoadImagePath);
float fs = (float)imginf.Length / 1024;
ImageSize_lbl.Text = smalldecimal(fs.ToString(), 2) + " KB";
ImageHeight_lbl.Text = DecryptedImage.Height.ToString() + " Pixel";
ImageWidth_lbl.Text = DecryptedImage.Width.ToString() + " Pixel";
double cansave = (8.0 * ((height * (width / 3) * 3) / 3 - 1)) / 1024;
CanSave_lbl.Text = smalldecimal(cansave.ToString(), 2) + " KB";
canPaint = true;
this.Invalidate();
}
}
private void DeSaveFileBrowse_btn_Click(object sender, EventArgs e)
{
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
{
DSaveFilePath = folderBrowserDialog1.SelectedPath;
DeSaveFile_tbx.Text = DSaveFilePath;
}
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
if(canPaint)
try
{
if (!EncriptionDone)
e.Graphics.DrawImage(loadedTrueImage, previewImage);
else
e.Graphics.DrawImage(AfterEncryption, previewImage);
}
catch
{
e.Graphics.DrawImage(DecryptedImage, previewImage);
}
}
private string justFName(string path)
{
string output;
int i;
if (path.Length == 3) // i.e: "C:\\"
return path.Substring(0, 1);
for (i = path.Length - 1; i > 0; i--)
if (path[i] == '\\')
break;
output = path.Substring(i + 1);
return output;
}
private string justEx(string fName)
{
string output;
int i;
for (i = fName.Length - 1; i > 0; i--)
if (fName[i] == '.')
break;
output = fName.Substring(i + 1);
return output;
}
private void Close_btn_Click(object sender, EventArgs e)
{
this.Close();
}
private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
System.Diagnostics.Process.Start("http:\\\\www.programmer2programmer.net");
}
}
}