<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Sign PDF with digital signature" href="https://bugs.freedesktop.org/show_bug.cgi?id=99416#c14">Comment # 14</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Sign PDF with digital signature" href="https://bugs.freedesktop.org/show_bug.cgi?id=99416">bug 99416</a> from <a class="email" href="mailto:huj@froreich-bioscientia.de" title="Hans-Ulrich Jüttner <huj@froreich-bioscientia.de>"> Hans-Ulrich Jüttner</a> <pre>(In reply to Albert Astals Cid from <a href="show_bug.cgi?id=99416#c13">comment #13</a>) > is the ASN1 thing in the PDF spec? I can't find it > The document from Adobe <a href="https://www.adobe.com/devnet-docs/acrobatetk/tools/DigSig/Acrobat_DigitalSignatures_in_PDF.pdf">https://www.adobe.com/devnet-docs/acrobatetk/tools/DigSig/Acrobat_DigitalSignatures_in_PDF.pdf</a> describes the generation of digital signatures in PDF documents. It says "5. The hash value is encrypted with the signer’s private key and a hex-encoded PKCS#7 object signature object is generated. 6. The signature object is placed in the file on disk, overwriting the placeholder /Contents value. Any space not used for the signature object is overwritten with zeros." RFC2315 (<a href="https://tools.ietf.org/html/rfc2315">https://tools.ietf.org/html/rfc2315</a>) describes PKCS#7 objects as ASN.1 structures. > This is only useful for documents that already have a signature field, right? > Yes, I couldn't figure out how to create such a signature field with poppler. So I content myself with the case where there is already a signature field in the PDF document. > Not that i'm an ultra fan of windows, but open_memstream seems not to work > there, is there anything else we could use? (No idea if anyone has tried > building the nss3 code in windows but maybe better if we don't make it > harder for them than necessary) I'm sorry about that, but I don't have access to a windows machine and, moreover, do not know much about windows.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>