how we can sign PDF file through e_Token in web application using c# .........

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C#3.5

Dear sir i am using following code in our desktop application.




public static void signPdfFile (string sourceDocument, string destinationPath, Stream privateKeyStream, string keyPassword, string reason, string location)

{

Pkcs12Store pk12=new Pkcs12Store(privateKeyStream, keyPassword.ToCharArray());

privateKeyStream.Dispose();



//then Iterate throught certificate entries to find the private key entry

string alias=null;
foreach (string tAlias in pk12.Aliases)
{

if (pk12.IsKeyEntry(tAlias))

{

alias = tAlias;

break;

}

}

var pk=pk12.GetKey(alias).Key;



// reader and stamper

PdfReader reader = new PdfReader(sourceDocument);

using (FileStream fout = new FileStream(destinationPath, FileMode.Create, FileAccess.ReadWrite))

{

using (PdfStamper stamper = PdfStamper.CreateSignature(reader, fout, '\0'))

{

// appearance

PdfSignatureAppearance appearance = stamper.SignatureAppearance;

//appearance.Image = new iTextSharp.text.pdf.PdfImage();

appearance.Reason = reason;

appearance.Location = location;

appearance.SetVisibleSignature(new iTextSharp.text.Rectangle(20, 10, 170, ), 1, "Icsi-Vendor");

// digital signature

IExternalSignature es = new PrivateKeySignature(pk, "SHA-256");

MakeSignature.SignDetached(appearance, es, new X509Certificate[] { pk12.GetCertificate(alias).Certificate }, null, null, null, 0, CryptoStandard.CMS);



stamper.Close();

}

}

}





public static void verifyPdfSignature (string pdfFile, Stream publicKeyStream)

{

var parser=new X509CertificateParser();

var certificate=parser.ReadCertificate(publicKeyStream);

publicKeyStream.Dispose();



PdfReader reader = new PdfReader(pdfFile);

AcroFields af = reader.AcroFields;

var names = af.GetSignatureNames();



if (names.Count == 0)

{

throw new InvalidOperationException("No Signature present in pdf file.");

}


foreach (string name in names)

{

if (!af.SignatureCoversWholeDocument(name))
{

throw new InvalidOperationException(string.Format("The signature: {0} does not covers the whole document.", name));

}



PdfPKCS7 pk = af.VerifySignature(name);

var cal = pk.SignDate;

var pkc = pk.Certificates;



if (!pk.Verify())

{

throw new InvalidOperationException("The signature could not be verified.");

}

if (!pk.VerifyTimestampImprint())

{

throw new InvalidOperationException("The signature timestamp could not be verified.");

}


Object[] fails = CertificateVerification.VerifyCertificates(pkc, new X509Certificate[] { certificate }, null, cal);

if (fails != null)

{

throw new InvalidOperationException("The file is not signed using the specified key-pair.");

}

}

}

but when i used it on Web application it have more error please try to solve it error or sent Another code for signing pdf using e_token .........