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https://issues.apache.org/jira/browse/PDFBOX-3552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15629829#comment-15629829
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ASF subversion and git services commented on PDFBOX-3552:
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Commit 1767747 from [~tilman] in branch 'pdfbox/branches/2.0'
[ https://svn.apache.org/r1767747 ]
PDFBOX-3552: update ByteRange COSArray so that users can access the actual
values before closing
> Allow external signing in two steps
> -----------------------------------
>
> Key: PDFBOX-3552
> URL: https://issues.apache.org/jira/browse/PDFBOX-3552
> Project: PDFBox
> Issue Type: Improvement
> Components: Signing
> Affects Versions: 2.0.3
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Fix For: 2.0.4, 2.1.0
>
>
> As requested by user Fabricio Pombo Koch in the mailing list:
> {quote}
> I'm trying to sign a PDF with an external service. This service receives the
> PDF's content (hash) and returns the signature (hash).
> I followed the "CreateSignature" and "CreateVisibleSignature" examples and I
> was able to make it works.
> But, I need to sign the PDF in 2 steps:
> 1- Get PDF's content, calculate the hash and send the hash to the service
> that is responsible to sign the hash.
> 2- Get the signature hash returned from the service and insert it into my
> PDF.
> Note that in the 2nd step I'm not in the same context from 1st step, so, I
> can't access the PDF that was loaded in step 1. I would need to load it again.
> {quote}
> As discussed in the mailing list, the strategy will be:
> 1) call {{saveIncrementalForExternalSigning}} and get the signing content
> 2) set a dummy singature, e.g. {{externalSigning.setSignature(new byte\[0]);}}
> 3) before closing, get the ByteRange from the signature object
> 4) after getting the real signature, sign with the help of the byte range.
> The file must be reopened, but PDFBox isn't needed, one just writes the ascii
> hex signature at the proper place.
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