fixing a corrupted signature

[mcalmus]

We have been using iText for quite some time for filling and signing PDFs. One of these PDFs is signed first by the person to whom it applies and then by the certifying official. We recently realized the signature had not been done with the "append" flag turned on. As such all of our stored files have a valid certifying signature but the original signature is invalid. Acrobat Reader says "The signature byte range is invalid". Is it possible to either fix this first signature or strip out the second signature (thereby making the original signing valid)? Code samples would be helpful.

 

Thanks.

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[1T3XT info]

Mike Calmus wrote:
> We have been using iText for quite some time for filling and signing
> PDFs. One of these PDFs is signed first by the person to whom it applies
> and then by the certifying official. We recently realized the signature
> had not been done with the "append" flag turned on. As such all of our
> stored files have a valid certifying signature but the original
> signature is invalid. Acrobat Reader says "The signature byte range is
> invalid". Is it possible to either fix this first signature or strip out
> the second signature (thereby making the original signing valid)?

No, as you haven't signed in append mode, the internal structure of the
PDF was changed, and you can't restore the original structure.
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_______________________________________________
iText-questions mailing list
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Buy the iText book: http://www.1t3xt.com/docs/book.php
Check the site with examples before you ask questions: http://www.1t3xt.info/examples/
You can also search the keywords list: http://1t3xt.info/tutorials/keywords/