Am 19.01.2017 um 17:53 schrieb Peter Koellner:
Hi!
I am currently evaluating PDFBox 2.0.4 for a document signing
application that uses CADES with X509 certificates residing on a smart
card. Rendering looks fine, and I think I am more or less through with
the actual signing process, but as far as filling the signature field
is concerned, I am a bit at a loss.
I have been looking at the CreateVisibleSignature example, but I have
some difficulties identifying what exactly I do need to implement to
just fill an existing signature field, since
the whole example seems to prepare nearly every detail explicitly. I
probably would have expected the whole signature appearance basics as
part of the library, but that does not seem to be the case, or does it?
Is there perhaps some more example code somewhere else that would
apply here?
The appearance stuff is also in the sources (PDVisibleSignDesigner,
PDVisibleSigProperties) but it hard to understand. I have added comments
as best as I could. To sign on an existing signature just set the
signatureFieldName with the field name. This will bring a call to
findExistingSignature().
If you don't know the field name open the file with PDFDebugger and
search there... if you don't find it upload it somewhere and I'll tell you.
The example doesn't do CADES so you may have to improve parts. Signing
on an existing signature was tested with the file created by the
CreateEmptySignatureForm example.
Tilman
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