If I sign an existing PDF document in LibreOffice Draw, or export PDF from LibreOffice Writer and sign it during export, then Adobe Reader does not like the signature: it claims that the page has been modified. The expectation is that the signature checking should pass without any complaints. I will attach an example document signed by LibreOffice Writer. It is also possible to export the same document without signatures, and then use the same certificate in jSignPdf 1.6.4 to sign it. The result does not trigger the "pages modified" alert in Adobe Reader DC, so it is not a problem with the certificate. I will attach a document to demonstrate this, too. Note: by default, Adobe Reader DC does not trust certificates issued by COMODO. To verify my signature, please, in Adobe Reader DC, go to Edit > Preferences > Signatures > Verification > More... and check the box "Trust ALL root certificates in the Windows certificate store for: [X] Validating signatures".
Created attachment 146257 [details] Test document signed in LibreOffice Writer on Linux
Created attachment 146258 [details] Test document signed in jSignPDF 1.6.4 on Linux
Created attachment 146259 [details] Warning displayed by Adobe Reader DC
Thank you for filing the issue! Could you please describe, step-by-step, how did you sign the PDF in LibreOffice, mentioning every button click and keypress (except for passwords, of course)? My assumption would be that you have saved the PDF after signing.
0. Make sure that Firefox is not running (not sure if it is relevant) 1. Open LibreOffice Writer on Arch Linux 2. File > Open, open the odt document. Or just type the text and save it as an odt file. 3. At this stage, the document is not modified. Click File > Export As > Export as PDF... 4. A dialog appears. 5. On the general tab, leave all settings as the defaults. However, I remember that, in the past, i have specifically unticked the "Create a PDF form" box on the General tab, and LibreOffice remembers this. Anyway, the settings on the general tab are: All pages, JPEG compression at 90%, reduce image resolution to 300 dpi, no watermark, no checkboxes in the right column. 5. On all other tabs except Digital signatures, leave all the settings as defaults. 6. On the Digital Signatures tab, select my certificate (that is, click Select, double-click the certificate), type the password, leave all other fields empty. 7. Press the Export button in the bottom right corner of the dialog. 8. Type the desired filename for the PDF file, press Save.
This bug is reproducible on Arch Linux but not under Windows 10.
FWIW xmlsecurity/qa/create-certs/ has a shell script you can run on Linux and use the resulting test certificates on both Windows an Linux if you want to reproduce this.
You can also get free email certificates from COMODO, just as I did.
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Same warning in LO 6.4+ in Windows 7 as in attachment 146259 [details]: "1 Page(s) Modified". I guess I can put to New. But please also test.
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I have the same problem. Signed PDF document exported by LibreOffice (Writer) signature seems to be OK when verified e.g. by poppler pdfsig utility. However Adobe Reader (used to make sure the exported document is correct for mainstream users utilizing mainstream apps, or rather correct then opened in THE PDF reader app) successfully verifies the signature, but claims that the document was modified after signing. This does not happen e.g. for some randomly chosen PDF document released and signed by the (our) government. The problem is unaffected by changing "normal" to archive PDF/A (either 2b or 1b) PDF export option (other options left default). LiberOffice version: 6.4.3.2 (build 6.4.3-1) (but it's a long-term problem, the same problem was months or years ago) Adobe Reader version: 11.0.10 (for Windows, running in Wine) OS: Arch linux
.. to check a different linux flavour, I have tested in Debian stable (10.3, x86_64), libreoffice 6.1.5.2 (build 1:6.1.5-3+deb10u5). And the problem is still the same.
.. I currently do not have resource to inspect and build LibreOffice source, but I've made potentially interesting observation when inspecting/manipulating the resulting PDF file. When the last (4th) PDF signature /ByteRange [ ... ] component (i.e. 2nd offset) is increased by 1, the signature is of course verified as incorrect, but the "1 Page(s) Modified" no longer appears (it is not the case if the value is decreased by 1).
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This bug still persists in Ubuntu 20.04 (version: LibreOffice 6.4.6.2 40(Build:2) ). At least for me this is an important issue since it makes it essentially impossible to directly use the amazing digital signing support in LibreOffice. As far as I can tell there are no issues with signing an existing pdf so as a work around one can first export and then sign. But of course this is somewhat less flexible.
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(In reply to Alexander E. Patrakov from comment #0) > If I sign an existing PDF document in LibreOffice Draw, > or export PDF from LibreOffice Writer I tried to export an empty Writer file with a signature, and also I created an empty PDF and then tried to sign it using File->Digital Signature->Sign Existing PDF. I used versions 6.1.0.3 and 7.4.0.1 for testing. (In reply to Alexander E. Patrakov from comment #6) > This bug is reproducible on Arch Linux but not under Windows 10. I was able to see the problem on Windows 10 when exporting/signing from Writer (i.e., using PDF export dialog's Digital Signatures tab). The resulting signed PDF shows the "1 Page(s) Modified" warning in Adobe Acrobat Reader DC, both when generator is 6.1, and 7.4. However, PDFs from "Sign Existing PDF" produced by both 6.1 and 7.1 do not show that warning in Acrobat Reader. The question is: maybe we could unify the signing, to use the process of "Sign Existing PDF", feeding the stream generated by simple export? That puts the signature object after the initial %%EOF. FTR: the PDF export dialog uses PDFWriterImpl::emitSignature / PDFWriterImpl::finalizeSignature, while Sign Existing PDF uses PDFDocument::Sign.
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