From what I'm reading on ISO 32000, the certification Signature is a
normal signature, but with a DocMDP transform method. So the ou should
do something like this:
PDSignature signature = new PDSignature;
[..] //do your thing
COSDictinary dictionary = signature.getCOSObject();
//Create a reference dictionary
COSDictionary reference = new COSDictionary();
reference.setItem("Type", COSName.getPDFName("SigRef"));
reference.setItem("TransformMethod", COSName.getPDFName("DocMDP"));
reference.setItem("DigestMethod", COSName.getPDFName("SHA1"));
//Only MD5 or SHA1... Go with the least worse
//Now we add DocMDP specific stuff
COSDictionary transformParameters = new COSDictionary();
transformParameters.setItem("Type",
COSName.getPDFName("TransformParams"));
transformParameters.setInteger("P", <1, 2 or 3>); // 1- no changes
permited; 2- fill forms and signing; 3- Same as 2 plus annotation
creation, deletion an modification.
transformParameters.setItem("V", COSName.getPDFName("1.2")); // This
is right, it's a name, not a number.
// Add everything in order
reference.setItem("TransformParams", transformParameters ); // Add
DocMDP stuff to the SigRef Dictionary;
COSArray references = new COSArray();
references.add(reference); // Add SigRef Dictionary to a Array
dictionary.setItem("Reference", reference); // Add Array to
Signature dictionary
I didn't try it myself, just wrote based on PdfBox API and ISO
specification. May have errors.
On 18/10/2016 06:12, Damien Butaye wrote:
Hello Tilman,
Here follows two links explaining the difference :
1. http://www.investintech.com/resources/articles/certifyingsigningpdf/
2.
http://stackoverflow.com/questions/16710439/how-to-add-blank-page-in-digitally-signed-pdf-using-java/16711745#16711745
Damien.
2016-10-18 8:49 GMT+02:00 Tilman Hausherr <thaush...@t-online.de>:
Dear all,
I'm looking for a solution to certify a PDF. Currently I'm able to
sign a
PDF using PDFBox but I can't certify it. Is-it possible to do it with
PDFBox?
Thank you for your help!
What's the difference? (See my other answer from today)
Tilman
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