Second digital signature invalid one

Hi all

I'm having some trouble adding a second digital signature to an already digitally signed PDF file. The library that I use to manage PDF files is open source, so I change the PDF files programmatically. The first PDF I produce, PDF1 (PDF with a signature), has a valid digital signature. The second PDF file I produce, PDF2 (the PDF file with two signatures), has the second marked signature as valid, but the first as not valid with the following error:

Error during signature verification.  
Unexpected byte range values defining scope of signed data.
Details: The signature byte range is invalid

I have read and applied all the "best practices" on the PDF digital signature, so I add the second signature in incremental mode and I am sure that the second PDF has no change in the first part, this is because if I do a binary comparison of PDF1 PDF2, the first part of the PDF2 equals PDF1. So, if you remove the part of PDF2 (after the first %% EOF), you get PDF1, once again, with the digital signature is valid. So the problem seems to be in something again in the part of PDF2 making Acrobat Reader X think that the first digital signature is not valid.

If you want to see three PDF files, here are the links:

The original PDF: https://docs.google.com/viewer?a=v & pid = explore & chrome = true & srcid = 0BzrgexS80Iq_ODQxZTY2MDk tNTQyYi00YTE0LTk0MTctYWMxNDFiOWY4MjA5 & hl = en_US

PDF1: https://docs.google.com/viewer?a=v & pid = explore & chrome = true & srcid = 0BzrgexS80Iq_ZDQ3MTk1ZmI tNWI4NS00YzdhLTkxNmUtODk1NjVmY2M2NTVh & hl = en_US

PDF2: https://docs.google.com/viewer?a=v & pid = explore & chrome = true & srcid = 0BzrgexS80Iq_ZGM1YmZhMWE tY2JiYi00YzZkLWE5ZjItNzgwM2RlNzExYWE1 & hl = en_US

Any help will be very appreciated. Best regards.

Hello

I don't know if this helps, but I found something unusual with your PDF2. Just at the beginning of the second incremental update (with the new signature), the first object is added without a carriage return. This the last line of the previous update mark looks like this:

%% EOF3 0 obj

Perhaps which leads to an incorrect analysis and then invalidates the signature? Not sure on this subject, but as far as I can read offsets, your ranges of bytes are correct.

Tags: Adobe Developers

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