Pedro,

P3d3r0s0 wrote:
> this the file with the verified digest:
> http://www.filefactory.com/file/b3hc38g/n/signed_pdf

I'll have a look at your sample files later, but concerning:

P3d3r0s0 wrote:
> I suppose that in order to use the detached one you mentioned i would have
> to use:
> PdfSignature dic1 = new PdfSignature(PdfName.ADOBE_PPKLITE,
> PdfName.ADBE_PKCS7_DETACHED);
> 
> I was just trying this approach but adobe reader says "Signature contains
> incorrect, unrecognized, .... ".
> sample: http:// http://www.filefactory.com/file/b3hc3h9/n/signed_pdf
> which is, i think, because im inserting the signedHash like this:
> dic.put(PdfName.CONTENTS, new PdfString(signedHash).setHexWriting(true));

Your thought is correct; when using the /SubFilter /adbe.pkcs7.detached, the
contents shall contain a PKCS#7 signature container, not a mere signed hash.
Please consult http://itextpdf.sourceforge.net/howtosign.html

Regards,   Michael.
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