/**
* Creates PDFDocuments to create shares, encrypt the original PDF and draws texts on the PDF shares
*
*/
public void createShares()
{
List <PDFDocument> pdfShares = new List <PDFDocument>();
Dictionary <int, string> coefShares = new Dictionary <int, string>();
for (int i = 0; i < _numOfShares; i++)
{
pdfShares.Add(new PDFDocument());
pdfShares[i].DisplayMode = _plainPDF.DisplayMode;
pdfShares[i].DocumentInformation = _plainPDF.DocumentInformation;
pdfShares[i].PageLayout = _plainPDF.PageLayout;
pdfShares[i].PageOrientation = _plainPDF.PageOrientation;
pdfShares[i].PortfolioInformation = _plainPDF.PortfolioInformation;
pdfShares[i].PageLayout = _plainPDF.PageLayout;
pdfShares[i].PageSize = _plainPDF.PageSize;
pdfShares[i].PageWidth = _plainPDF.PageWidth;
pdfShares[i].PageHeight = _plainPDF.PageHeight;
}
foreach (KeyValuePair <Object, Object> entry in _words)
{
if (entry.Key.GetType() != typeof(string))
{
List <Words> Words = (List <Words>)entry.Value;
int pageIndex = (int)entry.Key;
//add next page for future processing
for (int l = 0; l < pdfShares.Count; l++)
{
pdfShares[l].AddPage();
pdfShares[l].Pages[pageIndex].Document.DocumentInformation.Keywords = "";
}
for (int i = 0; i < Words.Count; i++)
{
Words word = Words[i];
string secret = word.Word;
int[] coefficients = new int[_shareforRec - 1];
// string str = "";
if (_shareforRec == 2)
{
coefficients[0] = _coefficients[0];
}
else
{
//Generate the random values and make sure our coefficients are less than the modulus value
for (int index = 0; index < coefficients.Length; index++)
{
int coefIndex = _rand.Next(1, _coefficients.Count) - 1;
coefficients[index] = _coefficients[coefIndex];
}
}
Share[] textShares = ShareGenerator.GenerateShares(secret, _numOfShares, _shareforRec, coefficients, _avgFrequencyMap);
for (int l = 0; l < textShares.Length; l++)
{
pdfShares[l].Pages[pageIndex].Canvas.DrawText(textShares[l].GetCipherText(), word.FontBase, word.FontBrush, word.Left, word.Top);
if (secret == "because")
{
//pdfShares[l].Pages[pageIndex].Canvas.DrawText(textShares[i].ToString().Length, word.FontBase, word.FontBrush, word.Left, word.Top);
}
}
}
}
}
for (int i = 0; i < _coefficients.Count; i++)
{
int[] coefficientShares = new CoefficientCodec(_coefficients[i], _numOfShares, _shareforRec, "Encrypt").shares;
for (int shareIndex = 0; shareIndex < coefficientShares.Length; shareIndex++)
{
if (!coefShares.ContainsKey(shareIndex))
{
coefShares.Add(shareIndex, coefficientShares[shareIndex].ToString() + ",");
}
else
{
coefShares[shareIndex] += coefficientShares[shareIndex].ToString() + ",";
}
}
}
for (int i = 0; i < pdfShares.Count; i++)
{
pdfShares[i].DocumentInformation.Keywords = coefShares[i];
pdfShares[i].Save(_encryptedFilePath + (i + 1) + ".pdf");
pdfShares[i].Dispose();
}
}
/**
* 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.");
}
}
}