Hi everyone,
I am working with digital signatures with iText 5.3.2 (c#), but have an
issue with the PdfReader.
First, I read the file with the following code:
string path = "some path to my pdf file...";
PdfReader pdf = new PdfReader(path);
Then, I created a copy of the reader:
PdfReader pdfCopy = new PdfReader(pdf); //I need to keep the original
PdfReader for a background process, reading again the file takes 20 secs
per each.
After that, I tried to sign the pdfCopy:
FileStream fout = new FileStream("...some directory\output.pdf",
FileMode.Create)
PdfStamper stp = PdfStamper.CreateSignature(pdfCopy.Reader, fout, '\0',
null, true);
PdfSignatureAppearance sap = stp.SignatureAppearance;
IExternalSignature es = new PrivateKeySignature(pk, "SHA-256");
MakeSignature.SignDetached(sap, es, chain, null, null, null, 0,
CryptoStandard.CADES);
And Adobe Reader cannot read the file, with error 14.
If I sign the original PdfReader "pdf", everything goes perfect, but
signing the "pdfCopy" somehow corrupts the file. Please, help me with the
following questions:
- Can I sign more than once the same PdfReader? I mean, can I keep the same
PdfReader in memory and sign it again, simulating reading the pdf on each
signature attemp.
- Is the pdfCopy different form the original? Why I cannot sign it?
Thanks in advance for your help and time.
Regards,
Jose
--
Saludos cordiales,
José Bonilla
(+593) 95031497
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