On 2/16/06, Philipp Lohmann - Sun Germany - ham02 - Hamburg <[EMAIL PROTECTED]> wrote: > Welcome. > > Please let us discuss this on [email protected] mailing list as > there are also others with an interest in improving OOo's PDF export > capabilities. > > As a starting point let's discuss what strategy to use to add encryption > /signing to PDF export. Would this be something to be done after the PDF > file is already created or would we do this while creating the actual > PDF file ? I made research of the PDF export source code and as I understood you just take the snapshot of the page, save it to JPEG and then write this page image stream into the pdf file. We can create the signature right before writting the PDF trailer. (We'll have all PDF offsets available). > Using the afterwards approach would probably make the implementation > easier and more independent of the actual PDF generation whereas doing > encryption and digesting for signing "on the fly" might give us better > performance. Or as you say we can update the PDF afterwards, but then we'll need to parse PDF file to get all it's offsets. I saw that OO has "Digital Signatures" dialogs. I hope we can use them. By the way, how do you want it to work? Do you want to pick signers certificates in export settings, or suggest to sign the PDF if the OO file is already signed and take same certificates which are used for OO file signing? > For reference: there are already feature requests for these features, > namely OOo issues 12626 (security controls), 59651 (PDF/A for which > signing is at least very helpful), 47895 (signing). > > Kind regards, pl > > > On 15.02.2006, at 02:57, Pavel Vassiliev wrote: > >> I'd love to try to contribute to > >> OO. I want to work on PDF signing and encryption. I've chosen this > >> project because I've some experience in cryptography and familiar with > >> PDF format. > >
-- With best regards, Pavel Vassiliev --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
