hi Paulo, thanks a lot for your answer.
I increased the value form 128 to 256 for making room for the 2048-bit key. The signing process works fine. But when I open the PDF with the Acrobat Reader the build in verification says, that the document is not valid and has been modified. Any suggestions what do to now? Thanks... best regards, rene the signing process works fine and the "Paulo Soares" <[EMAIL PROTECTED]> schrieb im Newsbeitrag news:[EMAIL PROTECTED] > The examples assume 1024 long keys and that shows in things like "new > byte[128]". Make sure that you make room for longer keys. > > Paulo > > ----- Original Message ----- > From: "Rene" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Wednesday, April 25, 2007 1:53 PM > Subject: [iText-questions] Problem with signing PDFs when using 2048-bit > key > > >> Hi, >> >> I am using iText 1.4.8 and try to sign PDFs with external generated >> signatures. >> >> Up till know it works fine (using different SmartCards with 1024-bit key >> lenght). Today I tried a new card with 2048-bit RSA key and I get a >> problem when I try to copy the generated bytes into the PdfDictinary. >> The generated Data is to much (I think because of the 2048-bit key). >> I used the iText code example for inserting external signatures. >> >> Anyone a suggestion what to do to fix it? (with a SmartCard with a >> 1024-bit key everything works fine...). >> >> In the following you will find the code where occures the problem. >> >> Thanks for your help. >> >> Best regards, >> rene >> >> -------------------------------------- >> >> PdfSigGenericPKCS sg = sap.getSigStandard(); >> PdfLiteral slit = (PdfLiteral) sg.get(PdfName.CONTENTS); >> byte[] outc = new byte[(slit.getPosLength() - 2) / 2]; >> PdfPKCS7 sig = sg.getSigner(); >> >> /* >> create hash and signature... >> */ >> >> // Sets the generated signature and hash of the PDF part(!!!) >> sig.setExternalDigest(job.getSignatur(), hash, "RSA"); //$NON-NLS-1$ >> >> // Creates the signedData-object and adds it into the temporary >> // PDF file. >> PdfDictionary dic = new PdfDictionary(); >> >> byte[] ssig = sig.getEncodedPKCS7(); >> >> System.arraycopy(ssig, 0, outc, 0, ssig.length); //sysout: >> PDF.Signatur.ssig: 3081 bytes, outc: 3014 bytes >> dic.put(PdfName.CONTENTS, new PdfString(outc) >> .setHexWriting(true)); > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by DB2 Express > Download DB2 Express C - the FREE version of DB2 express and take > control of your XML. No limits. Just data. Click to get it now. > http://sourceforge.net/powerbar/db2/ > _______________________________________________ > iText-questions mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/itext-questions > Buy the iText book: http://itext.ugent.be/itext-in-action/ > ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ iText-questions mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
