private void ProcessBtn_Click(object sender, EventArgs e)
{
debug("*****Started (document = " + inputBox.Text + " => " + outputBox.Text + ") ");
debug("Checking certificate ...");
Cert myCert = null;
try
{
string tsaUrl = String.IsNullOrEmpty(TSAUrlTextBox.Text) ? null : TSAUrlTextBox.Text;
if (certificateData != null)
{
//X509Certificate2 cert = certsListBox.SelectedItem as X509Certificate2;
byte[] bytes = certificateData.Export(X509ContentType.Pfx, certificatePwdBox.Text);
myCert = new Cert(bytes, certificatePwdBox.Text, tsaUrl, tsaLogin.Text, tsaPwd.Text);
}
else
{
myCert = new Cert(certificateTextBox.Text, certificatePwdBox.Text, tsaUrl, tsaLogin.Text, tsaPwd.Text);
}
debug("Certificate OK");
}
catch (Exception ex)
{
debug("Warning : No valid certificate found, please make sure you entered a valid certificate file and password");
//debug("Exception : " + ex.ToString());
debug(" ==> Continue ... the document will not be signed !");
//return;
}
debug("Checking encryption options ...");
PDFEnc.UserPwd = encUserPwd.Text;
PDFEnc.OwnerPwd = encOwnerPwd.Text;
debug("Creating new MetaData object... ");
//Adding Meta Datas
MetaData MyMD = new MetaData();
MyMD.Author = authorBox.Text;
MyMD.Title = titleBox.Text;
MyMD.Subject = subjectBox.Text;
MyMD.Keywords = kwBox.Text;
MyMD.Creator = creatorBox.Text;
MyMD.Producer = prodBox.Text;
debug("Processing document ... ");
PDFSigner pdfs = new PDFSigner(inputBox.Text, outputBox.Text, myCert, MyMD);
PDFSignatureAP sigAp = new PDFSignatureAP();
sigAp.SigReason = Reasontext.Text;
sigAp.SigContact = Contacttext.Text;
sigAp.SigLocation = Locationtext.Text;
sigAp.Visible = SigVisible.Checked;
sigAp.Multi = multiSigChkBx.Checked;
sigAp.Page = Convert.ToInt32(numberOfPagesUpDown.Value);
sigAp.CustomText = custSigText.Text;
if (sigImgBox.Image != null)
{
MemoryStream ms = new MemoryStream();
sigImgBox.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
sigAp.RawData = ms.ToArray();
ms.Close();
}
sigAp.SigX = (float)sigPosX.Value;
sigAp.SigY = (float)sigPosY.Value;
sigAp.SigW = (float)sigWidth.Value;
sigAp.SigH = (float)sigHeight.Value;
pdfs.Sign(sigAp, encryptChkBx.Checked, PDFEnc);
debug("Done :)");
MessageBox.Show("The document has been succesfully processed", "iSafePDF :: Signature done", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
public void Sign(PDFSignatureAP sigAP, bool encrypt, PDFEncryption Enc)
{
PdfReader reader = new PdfReader(this.inputPDF);
FileStream fs = new FileStream(this.outputPDF, FileMode.Create, FileAccess.Write);
PdfStamper st;
if (this.myCert == null) //No signature just write meta-data and quit
{
st = new PdfStamper(reader, fs);
}
else
{
st = PdfStamper.CreateSignature(reader, fs, '\0', null, sigAP.Multi);
}
if (encrypt && Enc != null)
{
Enc.Encrypt(st);
}
//st.SetEncryption(PdfWriter.STRENGTH128BITS, "user", "owner", PdfWriter.ALLOW_COPY);
st.MoreInfo = this.metadata.getMetaData();
st.XmpMetadata = this.metadata.getStreamedMetaData();
if (this.myCert == null) //No signature just write meta-data and quit
{
st.Close();
return;
}
PdfSignatureAppearance sap = st.SignatureAppearance;
//sap.SetCrypto(this.myCert.Akp, this.myCert.Chain, null, PdfSignatureAppearance.WINCER_SIGNED);
sap.SetCrypto(null, this.myCert.Chain, null, PdfSignatureAppearance.SELF_SIGNED);
sap.Reason = sigAP.SigReason;
sap.Contact = sigAP.SigContact;
sap.Location = sigAP.SigLocation;
if (sigAP.Visible)
{
iTextSharp.text.Rectangle rect = st.Reader.GetPageSize(sigAP.Page);
sap.Image = sigAP.RawData == null ? null : iTextSharp.text.Image.GetInstance(sigAP.RawData);
sap.Layer2Text = sigAP.CustomText;
sap.SetVisibleSignature(new iTextSharp.text.Rectangle(sigAP.SigX, sigAP.SigY, sigAP.SigX + sigAP.SigW, sigAP.SigY + sigAP.SigH), sigAP.Page, null);
}
/////
PdfSignature dic = new PdfSignature(PdfName.ADOBE_PPKLITE, new PdfName("adbe.pkcs7.detached"));
dic.Reason = sap.Reason;
dic.Location = sap.Location;
dic.Contact = sap.Contact;
dic.Date = new PdfDate(sap.SignDate);
sap.CryptoDictionary = dic;
int contentEstimated = 15000;
// Preallocate excluded byte-range for the signature content (hex encoded)
Dictionary <PdfName, int> exc = new Dictionary <PdfName, int>();
exc[PdfName.CONTENTS] = contentEstimated * 2 + 2;
sap.PreClose(exc);
PdfPKCS7 sgn = new PdfPKCS7(this.myCert.Akp, this.myCert.Chain, null, "SHA1", false);
IDigest messageDigest = DigestUtilities.GetDigest("SHA1");
Stream data = sap.RangeStream;
byte[] buf = new byte[8192];
int n;
while ((n = data.Read(buf, 0, buf.Length)) > 0)
{
messageDigest.BlockUpdate(buf, 0, n);
}
byte[] hash = new byte[messageDigest.GetDigestSize()];
messageDigest.DoFinal(hash, 0);
DateTime cal = DateTime.Now;
byte[] ocsp = null;
if (this.myCert.Chain.Length >= 2)
{
String url = PdfPKCS7.GetOCSPURL(this.myCert.Chain[0]);
if (url != null && url.Length > 0)
{
ocsp = new OcspClientBouncyCastle(this.myCert.Chain[0], this.myCert.Chain[1], url).GetEncoded();
}
}
byte[] sh = sgn.GetAuthenticatedAttributeBytes(hash, cal, ocsp);
sgn.Update(sh, 0, sh.Length);
byte[] paddedSig = new byte[contentEstimated];
if (this.myCert.Tsc != null)
{
byte[] encodedSigTsa = sgn.GetEncodedPKCS7(hash, cal, this.myCert.Tsc, ocsp);
System.Array.Copy(encodedSigTsa, 0, paddedSig, 0, encodedSigTsa.Length);
if (contentEstimated + 2 < encodedSigTsa.Length)
{
throw new Exception("Not enough space for signature");
}
}
else
{
byte[] encodedSig = sgn.GetEncodedPKCS7(hash, cal);
System.Array.Copy(encodedSig, 0, paddedSig, 0, encodedSig.Length);
if (contentEstimated + 2 < encodedSig.Length)
{
throw new Exception("Not enough space for signature");
}
}
PdfDictionary dic2 = new PdfDictionary();
dic2.Put(PdfName.CONTENTS, new PdfString(paddedSig).SetHexWriting(true));
sap.Close(dic2);
//////
//st.Close();
}
