public static string GetDecryptedTextFromImage(Image image)
{
Bitmap img = new Bitmap(image);
int maxLinear = image.Width * image.Height;
SeedRNG generator = new SeedRNG((maxLinear + image.Width).GetHashCode(), maxLinear);
OutputConsole.Write("Seed generated");
string pass = string.Format("{0}x{1}={2}", image.Width, image.Height, maxLinear);
AESEncrypt encrypt = new AESEncrypt();
string text = string.Empty;
int value=0;
OutputConsole.Write("Processing image...");
do
{
Point point = LinearIndexToPoint(generator.Next, image.Width, image.Height);
Color pixel = img.GetPixel(point.X, point.Y);
value = DecodePixel(pixel);
if (value != 0)
text += Convert.ToChar(value);
} while (value != 0);
try
{
OutputConsole.Write(string.Format("String found: \n{0}", text));
OutputConsole.Write("Decrypting text...");
return encrypt.DecryptString(text, pass);
}
catch (Exception e)
{
OutputConsole.Write("Error: Text not found");
Console.WriteLine(e.Message);
return null;
}
}
private static void EncodeMessage(ref Bitmap img, string text)
{
int maxLinear = img.Width * img.Height;
SeedRNG generator = new SeedRNG((maxLinear + img.Width).GetHashCode(), maxLinear);
OutputConsole.Write("Seed generated");
string pass = string.Format("{0}x{1}={2}", img.Width, img.Height, maxLinear);
AESEncrypt encrypt = new AESEncrypt();
string encrypted = encrypt.EncryptString(text, pass);
OutputConsole.Write(string.Format("Text encrypted \n{0}", encrypted));
OutputConsole.Write("Processing image...");
if (encrypted.Length < maxLinear)
{
for (int i = 0; i < encrypted.Length; i++)
{
Point point = LinearIndexToPoint(generator.Next, img.Width, img.Height);
Color pixel = img.GetPixel(point.X, point.Y);
char letter = encrypted[i];
int value = Convert.ToInt32(letter);
Color n = EncodePixel(pixel, value);
img.SetPixel(point.X, point.Y, n);
}
//Null value placed at the end to indicate end of text
Point pointEnd = LinearIndexToPoint(generator.Next, img.Width, img.Height);
Color pixelEnd = img.GetPixel(pointEnd.X, pointEnd.Y);
img.SetPixel(pointEnd.X, pointEnd.Y, EncodePixel(pixelEnd, 0));
OutputConsole.Write("Finished embedding encrypted text");
}
else
{
OutputConsole.Write("Error: Image size doesn't support encrypted text size");
img = null;
}
}
public static string GetDecryptedTextFromImage(Image image)
{
Bitmap img = new Bitmap(image);
int maxLinear = image.Width * image.Height;
SeedRNG generator = new SeedRNG((maxLinear + image.Width).GetHashCode(), maxLinear);
OutputConsole.Write("Seed generated");
string pass = string.Format("{0}x{1}={2}", image.Width, image.Height, maxLinear);
AESEncrypt encrypt = new AESEncrypt();
string text = string.Empty;
int value = 0;
OutputConsole.Write("Processing image...");
do
{
Point point = LinearIndexToPoint(generator.Next, image.Width, image.Height);
Color pixel = img.GetPixel(point.X, point.Y);
value = DecodePixel(pixel);
if (value != 0)
{
text += Convert.ToChar(value);
}
} while (value != 0);
try
{
OutputConsole.Write(string.Format("String found: \n{0}", text));
OutputConsole.Write("Decrypting text...");
return(encrypt.DecryptString(text, pass));
}
catch (Exception e)
{
OutputConsole.Write("Error: Text not found");
Console.WriteLine(e.Message);
return(null);
}
}
private static void EncodeMessage(ref Bitmap img, string text)
{
int maxLinear = img.Width * img.Height;
SeedRNG generator = new SeedRNG((maxLinear + img.Width).GetHashCode(), maxLinear);
OutputConsole.Write("Seed generated");
string pass = string.Format("{0}x{1}={2}", img.Width, img.Height, maxLinear);
AESEncrypt encrypt = new AESEncrypt();
string encrypted = encrypt.EncryptString(text, pass);
OutputConsole.Write(string.Format("Text encrypted \n{0}",encrypted));
OutputConsole.Write("Processing image...");
if (encrypted.Length < maxLinear)
{
for (int i = 0; i < encrypted.Length; i++)
{
Point point = LinearIndexToPoint(generator.Next, img.Width, img.Height);
Color pixel = img.GetPixel(point.X, point.Y);
char letter = encrypted[i];
int value = Convert.ToInt32(letter);
Color n = EncodePixel(pixel,value);
img.SetPixel(point.X, point.Y, n);
}
//Null value placed at the end to indicate end of text
Point pointEnd = LinearIndexToPoint(generator.Next, img.Width, img.Height);
Color pixelEnd = img.GetPixel(pointEnd.X, pointEnd.Y);
img.SetPixel(pointEnd.X, pointEnd.Y, EncodePixel(pixelEnd, 0));
OutputConsole.Write("Finished embedding encrypted text");
}
else
{
OutputConsole.Write("Error: Image size doesn't support encrypted text size");
img = null;
}
}
private static void EncodeFileWithColor2(ref Bitmap img, byte[] file, string filename)
{
Bitmap backup = img.Clone() as Bitmap;
int maxLinear = img.Width * img.Height;
OutputConsole.Write(string.Format("File size: {0}", FileSizeFormatProvider.GetFileSize(file.Length)));
SeedRNG generator = new SeedRNG((maxLinear + img.Width).GetHashCode(), maxLinear, true);
OutputConsole.Write("Seed generated");
int extraBytes = 2 + filename.Length + file.Length.ToString().Length;
HiddenFile f = new HiddenFile(file, filename);
f.cipherFile((maxLinear + img.Width).GetHashCode());
OutputConsole.Write("Ciphering file...");
if (file.Length < maxLinear - extraBytes)
{
string fileLength = file.Length.ToString();
OutputConsole.Write("Processing image...");
OutputConsole.Write("Writing metadata...");
for (int i = 0; i < fileLength.Length; i++)
{
Point point = LinearIndexToPoint(generator.NextN, img.Width, img.Height);
Color pixel = img.GetPixel(point.X, point.Y);
char letter = fileLength[i];
int value = Convert.ToInt32(letter);
img.SetPixel(point.X, point.Y, EncodePixel(pixel, value));
}
//Insert # to separate file length from filename
Point point1 = LinearIndexToPoint(generator.NextN, img.Width, img.Height);
Color pixel1 = img.GetPixel(point1.X, point1.Y);
int value1 = Convert.ToInt32('#');
img.SetPixel(point1.X, point1.Y, EncodePixel(pixel1, value1));
//Insert filename and finish with null char
for (int i = 0; i < filename.Length; i++)
{
Point point = LinearIndexToPoint(generator.NextN, img.Width, img.Height);
Color pixel = img.GetPixel(point.X, point.Y);
char letter = filename[i];
int value = Convert.ToInt32(letter);
img.SetPixel(point.X, point.Y, EncodePixel(pixel, value));
}
point1 = LinearIndexToPoint(generator.NextN, img.Width, img.Height);
pixel1 = img.GetPixel(point1.X, point1.Y);
value1 = 0;
img.SetPixel(point1.X, point1.Y, EncodePixel(pixel1, value1));
OutputConsole.Write("Writing file data...");
//Write file
for (int i = 0; i < file.Length; i++)
{
Point point = LinearIndexToPoint(generator.NextN, img.Width, img.Height);
Color pixel = img.GetPixel(point.X, point.Y);
int value = f.file[i];
img.SetPixel(point.X, point.Y, EncodePixel(pixel, value));
}
OutputConsole.Write("Finished embedding file");
}
else
{
OutputConsole.Write("File size is greater than total pixels in image with extra data, resize or use another image to encrypt this file");
img = null;
}
}
public static HiddenFile GetFileFromImage2(Image image)
{
try
{
Bitmap img = new Bitmap(image);
int maxLinear = image.Width * image.Height;
SeedRNG generator = new SeedRNG((maxLinear + image.Width).GetHashCode(), maxLinear, true);
OutputConsole.Write("Seed generated");
string text = string.Empty;
int value = 0;
//Read file length
OutputConsole.Write("Processing image...");
OutputConsole.Write("Reading metadata...");
do
{
Point point = LinearIndexToPoint(generator.NextN, image.Width, image.Height);
Color pixel = img.GetPixel(point.X, point.Y);
value = DecodePixel(pixel);
if (value != '#')
text += Convert.ToChar(value);
} while (value != '#' && char.IsNumber((char)value));
int filelength = int.Parse(text);
OutputConsole.Write(string.Format("Extracted file size: {0} bytes", filelength));
text = string.Empty;
value = 0;
//Read filename
do
{
Point point = LinearIndexToPoint(generator.NextN, image.Width, image.Height);
Color pixel = img.GetPixel(point.X, point.Y);
value = DecodePixel(pixel);
if (value != 0)
text += Convert.ToChar(value);
} while (value != 0);
string filename = text;
OutputConsole.Write(string.Format("Extracted file name: {0}", filename));
byte[] file = new byte[filelength];
for (int i = 0; i < filelength; i++)
{
Point point = LinearIndexToPoint(generator.NextN, image.Width, image.Height);
Color pixel = img.GetPixel(point.X, point.Y);
value = DecodePixel(pixel);
file[i] = (byte)value;
}
OutputConsole.Write(string.Format("Extracted file content"));
HiddenFile f = new HiddenFile(file, filename);
f.cipherFile((maxLinear + img.Width).GetHashCode());
OutputConsole.Write("Ciphering file...");
return f;
}
catch (Exception e)
{
OutputConsole.Write("Error: File not found");
Console.WriteLine(e.Message);
return null;
}
}
public static HiddenFile GetFileFromImage2(Image image)
{
try
{
Bitmap img = new Bitmap(image);
int maxLinear = image.Width * image.Height;
SeedRNG generator = new SeedRNG((maxLinear + image.Width).GetHashCode(), maxLinear, true);
OutputConsole.Write("Seed generated");
string text = string.Empty;
int value = 0;
//Read file length
OutputConsole.Write("Processing image...");
OutputConsole.Write("Reading metadata...");
do
{
Point point = LinearIndexToPoint(generator.NextN, image.Width, image.Height);
Color pixel = img.GetPixel(point.X, point.Y);
value = DecodePixel(pixel);
if (value != '#')
{
text += Convert.ToChar(value);
}
} while (value != '#' && char.IsNumber((char)value));
int filelength = int.Parse(text);
OutputConsole.Write(string.Format("Extracted file size: {0} bytes", filelength));
text = string.Empty;
value = 0;
//Read filename
do
{
Point point = LinearIndexToPoint(generator.NextN, image.Width, image.Height);
Color pixel = img.GetPixel(point.X, point.Y);
value = DecodePixel(pixel);
if (value != 0)
{
text += Convert.ToChar(value);
}
} while (value != 0);
string filename = text;
OutputConsole.Write(string.Format("Extracted file name: {0}", filename));
byte[] file = new byte[filelength];
for (int i = 0; i < filelength; i++)
{
Point point = LinearIndexToPoint(generator.NextN, image.Width, image.Height);
Color pixel = img.GetPixel(point.X, point.Y);
value = DecodePixel(pixel);
file[i] = (byte)value;
}
OutputConsole.Write(string.Format("Extracted file content"));
HiddenFile f = new HiddenFile(file, filename);
f.cipherFile((maxLinear + img.Width).GetHashCode());
OutputConsole.Write("Ciphering file...");
return(f);
}
catch (Exception e)
{
OutputConsole.Write("Error: File not found");
Console.WriteLine(e.Message);
return(null);
}
}
private static void EncodeFileWithColor2(ref Bitmap img, byte[] file, string filename)
{
Bitmap backup = img.Clone() as Bitmap;
int maxLinear = img.Width * img.Height;
OutputConsole.Write(string.Format("File size: {0}", FileSizeFormatProvider.GetFileSize(file.Length)));
SeedRNG generator = new SeedRNG((maxLinear + img.Width).GetHashCode(), maxLinear, true);
OutputConsole.Write("Seed generated");
int extraBytes = 2 + filename.Length + file.Length.ToString().Length;
HiddenFile f = new HiddenFile(file, filename);
f.cipherFile((maxLinear + img.Width).GetHashCode());
OutputConsole.Write("Ciphering file...");
if (file.Length < maxLinear - extraBytes)
{
string fileLength = file.Length.ToString();
OutputConsole.Write("Processing image...");
OutputConsole.Write("Writing metadata...");
for (int i = 0; i < fileLength.Length; i++)
{
Point point = LinearIndexToPoint(generator.NextN, img.Width, img.Height);
Color pixel = img.GetPixel(point.X, point.Y);
char letter = fileLength[i];
int value = Convert.ToInt32(letter);
img.SetPixel(point.X, point.Y, EncodePixel(pixel, value));
}
//Insert # to separate file length from filename
Point point1 = LinearIndexToPoint(generator.NextN, img.Width, img.Height);
Color pixel1 = img.GetPixel(point1.X, point1.Y);
int value1 = Convert.ToInt32('#');
img.SetPixel(point1.X, point1.Y, EncodePixel(pixel1, value1));
//Insert filename and finish with null char
for (int i = 0; i < filename.Length; i++)
{
Point point = LinearIndexToPoint(generator.NextN, img.Width, img.Height);
Color pixel = img.GetPixel(point.X, point.Y);
char letter = filename[i];
int value = Convert.ToInt32(letter);
img.SetPixel(point.X, point.Y, EncodePixel(pixel, value));
}
point1 = LinearIndexToPoint(generator.NextN, img.Width, img.Height);
pixel1 = img.GetPixel(point1.X, point1.Y);
value1 = 0;
img.SetPixel(point1.X, point1.Y, EncodePixel(pixel1, value1));
OutputConsole.Write("Writing file data...");
//Write file
for (int i = 0; i < file.Length; i++)
{
Point point = LinearIndexToPoint(generator.NextN, img.Width, img.Height);
Color pixel = img.GetPixel(point.X, point.Y);
int value = f.file[i];
img.SetPixel(point.X, point.Y, EncodePixel(pixel, value));
}
OutputConsole.Write("Finished embedding file");
}
else
{
OutputConsole.Write("File size is greater than total pixels in image with extra data, resize or use another image to encrypt this file");
img = null;
}
}
