public List <DecryptedFile> Decrypt()
{
try
{
currentLock.LockBits();
if (IsEncryptedImage)
{
List <DecryptedFile> files = new List <DecryptedFile>();
int fileLength = BitConverter.ToInt32(ReadBytes(128, 32), 0);
int position = 160;
for (int i = 0; i < fileLength; i++)
{
string extention = Encoding.ASCII.GetString(ReadBytes(position, 24));
int fileSize = BitConverter.ToInt32(ReadBytes(position + 24, 32), 0);
byte[] data = ReadBytes(position + 56, fileSize);
DecryptedFile file = new DecryptedFile()
{
Data = data,
Extention = extention
};
files.Add(file);
position += 56 + fileSize;
}
return(files);
}
return(null);
}
catch (Exception ex)
{
}
finally
{
currentLock.UnlockBits();
}
return(null);
}
public void Encrypt(string[] encFiles, string saveLocation)
{
try
{
currentLock.LockBits();
List <BitArray> files = new List <BitArray>();
foreach (string path in encFiles)
{
BitArray fileArray = GetFileBits(path);
files.Add(fileArray);
}
int requiredBytes = TotalBits(files);
bool changeSize = MaxBitContent < requiredBytes;
if (changeSize)
{
Size requiredSize = GetRequiredImageSize(requiredBytes);
current = ResizeImage(requiredSize.Width, requiredSize.Height);
currentLock = new LockBitmap(current);
}
//Add parity and size bits
int position = 0;
Write(startSequenceArr, ref position);
Write(BitConverter.GetBytes(files.Count), ref position);
//Fill pixels with file data
int pos = 0;
foreach (BitArray file in files)
{
int lastDot = encFiles[pos].LastIndexOf(".");
string extention = encFiles[pos].Substring(lastDot + 1).PadRight(3);
if (extention.Length > 3)
{
extention = extention.Substring(0, 3);
}
Write(Encoding.ASCII.GetBytes(extention), ref position);
Write(BitConverter.GetBytes(file.Length), ref position);
Write(file, ref position);
}
Bitmap newImg = new Bitmap(current.Size.Width, current.Size.Height, PixelFormat.Format32bppArgb);
LockBitmap newImgLock = new LockBitmap(newImg);
newImgLock.LockBits();
for (int x = 0; x < current.Size.Width; x++)
{
for (int y = 0; y < current.Size.Height; y++)
{
newImgLock.SetPixel(x, y, currentLock.GetPixel(x, y));
}
}
newImgLock.UnlockBits();
newImg.Save(saveLocation);
}
catch (Exception ex)
{
}
finally
{
currentLock.UnlockBits();
}
}
