public static Color GetColor(Color pixel, bool [] tab)
{
var pixelR = ByteArrayExtension.Set2LastBits(pixel.R, tab[0], tab[1]);
var pixelG = ByteArrayExtension.SetLastBit(pixel.G, tab[2]);
var pixelB = ByteArrayExtension.SetLastBit(pixel.B, tab[3]);
return(Color.FromArgb(pixel.A, pixelR, pixelG, pixelB));
}
public Bitmap ReadImage(Bitmap image)
{
List <byte> hidden = new List <byte>();
byte[] byteArray;
byte bajt = 0;
byte[] end_word = Encoding.UTF8.GetBytes("STOP_DECRYPTING_THE_PICTURE");
int k = 0;
for (int i = 0; i < image.Width; i++)
{
for (int j = 0; j < image.Height; j += 2)
{
var pixel = image.GetPixel(i, j);
var pixel1 = image.GetPixel(i, j + 1);
BitArray bits = new BitArray(
new bool[]
{
ByteArrayExtension.GetBit(pixel.R, 1),
ByteArrayExtension.GetBit(pixel.R, 0),
ByteArrayExtension.GetBit(pixel.G, 0),
ByteArrayExtension.GetBit(pixel.B, 0),
ByteArrayExtension.GetBit(pixel1.R, 1),
ByteArrayExtension.GetBit(pixel1.R, 0),
ByteArrayExtension.GetBit(pixel1.G, 0),
ByteArrayExtension.GetBit(pixel1.B, 0)
});
bajt = EncryptionHelper.ConvertToByte(bits);
if (bajt == end_word[k])
{
k++;
}
else
{
k = 0;
}
hidden.Add(bajt);
if (k == 27)
{
break;
}
}
if (k == 27)
{
break;
}
}
hidden.RemoveRange(hidden.Count - 27, 27);
byteArray = hidden.ToArray();
using (MemoryStream ms = new MemoryStream(byteArray))
{
Bitmap img = (Bitmap)Image.FromStream(ms);
return(img);
}
}
