/**
* Reads input file to get PDFObjects from the original PDF
*
*/
public Dictionary <object, object> ReadinputFile(PDFDocument pdfDoc)
{
PDFImportedPage ip;
Dictionary <Object, Object> PlainDictionary = new Dictionary <Object, Object>();
PDFObjectsProcessor objectsProcessor = new PDFObjectsProcessor();
for (int PageIndex = 0; PageIndex < pdfDoc.Pages.Count; PageIndex++)
{
ip = (PDFImportedPage)pdfDoc.Pages[PageIndex];
PDFPageObjectCollection Objects = ip.ExtractPageObjects();
//SHA256 mySHA256 = SHA256Managed.Create();
//string content = ip.ExtractText();
//byte[] hashedContentKey = mySHA256.ComputeHash(GenerateStreamFromString(content));
List <Words> WordObjects = new List <Words>();
List <Blocks> BlockList = new List <Blocks>();
for (int j = 0; j < Objects.Count; j++)
{
if (Objects[j] is PDFTextPageObject)
{
PDFTextPageObject TextObject = (PDFTextPageObject)Objects[j];
WordObjects = objectsProcessor.GetWords(TextObject, WordObjects);
//BlockList = objectsProcessor.GetBlocks(TextObject, BlockList);
}
else if (Objects[j] is PDFImagePageObject)
{
_imageObjects.Add((PDFImagePageObject)Objects[j]);
}
else if (Objects[j] is PDFPathPageObject)
{
_pathObjects.Add((PDFPathPageObject)Objects[j]);
}
}
//PlainDictionary.Add(PageIndex, BlockList);
PlainDictionary.Add(PageIndex, WordObjects);
}
pdfDoc.Dispose();
return(PlainDictionary);
}
public static List <PDFDocument> getPdf(PDFDocument pdf, String xyz)
{
Share[] textShares;
System.Drawing.Bitmap[] imageShares = new System.Drawing.Bitmap[5];
//PdfFont font = secretPdf.AddFont("Arial");
System.Diagnostics.Stopwatch timer = new System.Diagnostics.Stopwatch();
//timer.Start();
////lOOP THROUGH EACH PAGE IN THE SECRET PDF
//for (int i = 0; i < secretPdf.PageCount; i++ )
//{
// //Text Extraction
// for (int j = 0; j < secretPdf.Pages[i].Canvas.GetTextData().Count; j++ )
// {
// //int test = secretPdf.Pages[i].Canvas.GetTextData().Count;
// PdfTextData secretData = secretPdf.Pages[i].GetWords()[j]; //our pdf text chunk to process
// textShares = ShareGenerator.GenerateShares(secretData.Text, n, k);
// ////Write the share data to the pdf shares
// //for (int l = 0; l < sharePdfs.Count; l++)
// //{
// //}
// System.Console.WriteLine("Chunk Complete");
// }
// //add next page for future processing
// for (int l = 0; l < sharePdfs.Count; l++)
// sharePdfs[l].AddPage();
// System.Console.WriteLine("Page Complete");
//}
//timer.Stop();
//System.Console.WriteLine("\n\nTime Elapsed: " + timer.ElapsedMilliseconds+"\n\n\n");
//timer.Reset();
//secretPdf.Dispose();
PDFDocument pdfDoc = pdf; //new PDFDocument("pdfimage.pdf");
//PDFDocument secondDoc = new PDFDocument("white.pdf");
PDFDocument recon = new PDFDocument();
List <int> usedShares = new List <int>();
usedShares.Add(2);
usedShares.Add(3);
usedShares.Add(4);
List <PDFDocument> pdfShares = new List <PDFDocument>();
for (int i = 0; i < 2; i++)
{
pdfShares.Add(new PDFDocument());
}
PDFImportedPage ip;
O2S.Components.PDF4NET.Text.PDFTextRunCollection textRuns;
timer.Start();
for (int i = 0; i < pdfDoc.Pages.Count; i++)
{
ip = (PDFImportedPage)pdfDoc.Pages[i];
textRuns = ip.ExtractTextRuns();
PDFPageObjectCollection objects = ip.ExtractPageObjects();
//add next page for future processing
for (int l = 0; l < pdfShares.Count; l++)
{
pdfShares[l].AddPage();
}
recon.AddPage();
for (int j = 0; j < textRuns.Count; j++)
{
textShares = ShareGenerator.GenerateShares(textRuns[j].Text, 5, 3);
PDFFont font = new PDFFont(PDFFontFace.Helvetica, textRuns[j].FontSize);
PDFBrush fontBrush = new PDFBrush(textRuns[j].FillColor);
//PDFPen pen = new PDFPen(textRuns[j].StrokeColor);
string[] shareString = new string[5];
for (int l = 0; l < 2; l++)
{
shareString[l] = textShares[l].GetCipherText();
pdfShares[l].Pages[i].Canvas.DrawText(shareString[l], font, fontBrush, textRuns[j].DisplayBounds.Left, textRuns[j].DisplayBounds.Top);
//pdfShares[l].Pages[i].Canvas.DrawTextBox(textShares[l].GetCipherText(), font, pen, fontBrush, textRuns[j].DisplayBounds.Left, textRuns[j].DisplayBounds.Top, textRuns[j].DisplayBounds.Width, textRuns[j].DisplayBounds.Height);
}
//System.Console.WriteLine("Chunk Complete");
string reconString = ShareAssembler.TextReconstruction(shareString, usedShares, 5, 3);
//System.Console.WriteLine(reconString);
recon.Pages[i].Canvas.DrawText(reconString, font, fontBrush, textRuns[j].DisplayBounds.Left, textRuns[j].DisplayBounds.Top);
}
for (int j = 0; j < objects.Count; j++)
{
PDFTextPageObject text;
PDFImagePageObject image;
PDFFont font;
PDFBrush fontBrush;
if (objects[j] is PDFTextPageObject)
{
text = (PDFTextPageObject)objects[j];
Console.WriteLine(text.FontName);
Console.WriteLine("textpdf");
font = new PDFFont(PDFFontFace.Helvetica, text.FontSize);
fontBrush = new PDFBrush(text.FillColor);
textShares = ShareGenerator.GenerateShares(text.Text, 2, 2);
string[] shareString = new string[2];
for (int l = 0; l < textShares.Length; l++)
{
shareString[l] = textShares[l].GetCipherText();
pdfShares[l].Pages[i].Canvas.DrawText(shareString[l], font, fontBrush, text.DisplayBounds.Left, text.DisplayBounds.Top);
}
string reconString = ShareAssembler.TextReconstruction(shareString, usedShares, 5, 3);
recon.Pages[i].Canvas.DrawText(reconString, font, fontBrush, text.DisplayBounds.Left, text.DisplayBounds.Top);
}
else if (objects[j] is PDFImagePageObject)
{
Console.WriteLine("imagepdf");
image = (PDFImagePageObject)objects[j];
/*
*
* following line is what needs to be revised until end
*
*
*
*
*
*
*
*/
//imageShares = ShareGenerator.GenerateReducedShares(image.Image, 5, 3, 15);
//imageShares = ShareGenerator.GenerateShares(image.Image, 5, 3);
ShareGenerator genShares = new ShareGenerator();
imageShares = genShares.GenShares(image.Image, 2, 2);
for (int l = 0; l < imageShares.Length; l++)
{
pdfShares[l].Pages[i].Canvas.DrawImage(imageShares[l], image.DisplayBounds.Left, image.DisplayBounds.Top, image.DisplayBounds.Width, image.DisplayBounds.Height);
}
shares = pdfShares;
ShareAssembler assembler = new ShareAssembler();
System.Drawing.Bitmap reconImage = assembler.ImageConstruction(imageShares, 2, 2);
recon.Pages[i].Canvas.DrawImage(reconImage, image.DisplayBounds.Left, image.DisplayBounds.Top, image.DisplayBounds.Width, image.DisplayBounds.Height);
}
else
{
}
}
System.Console.WriteLine("Page Complete");
//return shares;
}
timer.Stop();
System.Console.WriteLine("\n\nTime Elapsed: " + timer.ElapsedMilliseconds + "\n\n\n");
timer.Reset();
for (int i = 0; i < pdfShares.Count; i++)
{
pdfShares[i].Save("Share" + (i + 1) + ".pdf");
pdfShares[i].Dispose();
}
recon.Save(@"D:\Recon123-" + xyz + ".pdf");
recon.Dispose();
return(shares);
}
/**
* Iterates through encrypted documents and encrypted keywords to check if provided keyword exists or not
*
*
*/
public void SearchKeyWord()
{
List <PDFDocument> documentsList;
foreach (KeyValuePair <string, List <PDFDocument> > document in _encryptedDocuments)
{
Stopwatch watch = new Stopwatch();
watch.Start();
documentsList = document.Value;
List <string[]> coefficientList = RetrieveCoefficients(documentsList);
List <int> decryptedCoef = new CoefficientCodec(0, _numOfShares, _shareforRec, "Decrypt", coefficientList).coefficients;
List <int> CoefNeededToSearch = PerformCombinationOfCoef(decryptedCoef, _shareforRec - 1);
PDFDocument docShare = documentsList[0];
bool keywordFound = false;
Console.WriteLine("CoefNeededToSearch : " + CoefNeededToSearch.Count);
for (int coefIndex = 0; coefIndex < CoefNeededToSearch.Count; coefIndex++)
{
Share[] share = ShareGenerator.GenerateShares(_keyword, _numOfShares, _shareforRec, new int[] { CoefNeededToSearch[coefIndex] }, new SortedDictionary <int, int>());
for (int pageIndex = 0; pageIndex < docShare.Pages.Count; pageIndex++)
{
PDFPage page = docShare.Pages[pageIndex];
string text = ((PDFImportedPage)page).ExtractText();
PDFImportedPage ip = (PDFImportedPage)docShare.Pages[pageIndex];
PDFPageObjectCollection Objects = ip.ExtractPageObjects();
for (int j = 0; j < Objects.Count; j++)
{
if (Objects[j] is PDFTextPageObject)
{
PDFTextPageObject TextObject = (PDFTextPageObject)Objects[j];
if (TextObject.Text == share[0].GetCipherText())
{
keywordFound = true;
}
}
}
}
}
if (keywordFound)
{
watch.Stop();
Console.WriteLine("Search Time : " + watch.ElapsedMilliseconds);
watch.Reset();
watch.Start();
ShareAssemblerController shareAssembler = new ShareAssemblerController(_numOfShares, _shareforRec, _keyword);
shareAssembler.SharesReconstructor();
keywordFound = true;
watch.Stop();
Console.WriteLine("Decrypt and Highlight Time : " + watch.ElapsedMilliseconds);
}
else
{
Console.WriteLine("NO FILES CONTAIN THE KEYWORD YOU'RE LOOKING FOR.");
}
}
}
/**
* Recontructs the encrypted shares of the PDF to get original PDF.
* Hightlights every occurrences of the word that a user has searched for.
*
*/
public void SharesReconstructor()
{
List <List <PDFPageObjectCollection> > pDFPageObjects = ExtractObjects();
List <PDFPageObjectCollection> ObjectsPerPage;
PDFBrush redBrush = new PDFBrush(new PDFRgbColor(204, 255, 51));
PDFPen pen = new PDFPen(new PDFRgbColor(204, 255, 51), 1);
string[] shares;
for (int pageIndex = 0; pageIndex < pDFPageObjects.Count; pageIndex++)
{
_decryptedPDF.AddPage();
ObjectsPerPage = pDFPageObjects[pageIndex];
for (int wordIndex = 0; wordIndex < ObjectsPerPage[0].Count; wordIndex++)
{
shares = new string[_shareforRec];
PDFTextPageObject TextObject = null;
FontsProcessor fontsProcessor = null;
bool shouldProcess = false;
for (int shareIndex = 0; shareIndex < _shareforRec; shareIndex++)
{
PDFPageObjectCollection collection = ObjectsPerPage[shareIndex];
if (collection[wordIndex] is PDFTextPageObject)
{
TextObject = (PDFTextPageObject)collection[wordIndex];
if (TextObject.Text == "PDF4NET evaluation version 5.0.1.0")
{
shouldProcess = false;
break;
}
shares[shareIndex] = TextObject.Text;
fontsProcessor = new FontsProcessor();
shouldProcess = true;
}
}
if (shouldProcess)
{
string decryptedText = ShareAssembler.TextReconstruction(shares, _shareNumbers, _numOfShares, _shareforRec);
PDFBrush brush = new PDFBrush(TextObject.FillColor);
PDFFontBase FontBase = fontsProcessor.GetFontBase(TextObject.FontName, TextObject.FontSize);
if (decryptedText.ToLower().Equals(_keyword.ToLower()))
{
_decryptedPDF.Pages[pageIndex].Canvas.DrawRectangle(pen, redBrush, TextObject.DisplayBounds.Left, TextObject.DisplayBounds.Top, 4 * decryptedText.Length, FontBase.Size, 0);
for (int i = 0; i < _encryptedPdf.Count; i++)
{
_encryptedPdf[i].Pages[pageIndex].Canvas.DrawRectangle(pen, redBrush, TextObject.DisplayBounds.Left, TextObject.DisplayBounds.Top, 4 * decryptedText.Length, FontBase.Size, 0);
_encryptedPdf[i].Pages[pageIndex].Canvas.DrawText(shares[i > shares.Length - 1 ? 0 : i], FontBase, brush, TextObject.DisplayBounds.Left, TextObject.DisplayBounds.Top);
}
}
_decryptedPDF.Pages[pageIndex].Canvas.DrawText(decryptedText, FontBase, brush, TextObject.DisplayBounds.Left, TextObject.DisplayBounds.Top);
}
}
}
for (int i = 0; i < _encryptedPdf.Count; i++)
{
_encryptedPdf[i].Save(_encryptedFilePath + (i + 1) + ".pdf");
}
_decryptedPDF.Save(_decryptedFilePath);
}