[jira] [Updated] (PDFBOX-912) PDF signing interface and improvments

["Andreas Lehmkühler (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PDFBOX-912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andreas Lehmkühler updated PDFBOX-912:
--------------------------------------

    Fix Version/s: 1.6.0

> PDF signing interface and improvments
> -------------------------------------
>
>                 Key: PDFBOX-912
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-912
>             Project: PDFBox
>          Issue Type: Improvement
>          Components: PDFReader, PDModel, PDModel.AcroForm, Writing
>    Affects Versions: 1.4.0
>            Reporter: Thomas Chojecki
>            Assignee: Adam Nichols
>            Priority: Minor
>             Fix For: 1.6.0
>
>         Attachments: cos_object_improvement_patch.txt, fields_annotations_patch.txt, interface_options_patch.txt, io_patch.txt, main_documents_patch.txt, parser_patch.txt, signature_exception_patch.txt, test.pdf, test_signed.pdf, writer_patch.txt
>
>
> This is a first version of a signing interface for pdfbox. There are some design issues i could not handle without rewriting too much of the code.
> Here we go:
> - incremental update support (tested for signatures with pdf/a compatibility), not compatible with encrypted documents nor with xref-streams
> - cos object improvment
>   -- COSString with ability to force writing hexbin for given string
>   -- COSBase with ability to write direct into a dictionary (that means if this is set, no indirect object will be wrote) (sry hard to explain what i mean, actualy needed for incremental update to lower the rate of indirect objects)
>   -- COSBase with ability to force writing object (this hook help the COSWriter write needed objects for inkremental update)
>   -- COSName added new names
>   -- COSDocument some getter and setter for handling new signature and incremental features
> - SignatureException with some exceptions for handling the bunch of new possible errors
> -Parser improvments
>   -- PDFParser saves now the position of the last startxref
>   -- VisualSignatureParser (hook for parsing visual signature templates) (it's only for prepared visualisation that should be merged with the document)
> -IO improvments
>   -- COSFilterInput helps to find the proper content that should be hashed / signed
>   -- COSStandardOutputStream is tricky, it helps the writer to jump to the right place in the document
>   -- COSWriter got some improvments for incremental update
>   -- COSWriterXRefEntry needed for incremental updates and writing the new Xref table
> - PDDocument
>  -- got a new method addSignature with the needed implementation (do the whole signature stuff)
>  -- cleanup
> - Fields and Annotations
>  -- PDSignature represent the signature dictionary 
>  -- PDSignatureFild / Annotation are the visible & unvisible signature representations
> - Signature Interface and options
>  -- SignatureInterface the interface that shall be implemented for proper signing
>  -- SignatureOptions, some additional options for signing
> Patch splited into pieces
> sry for spelling, didn't include a spellchecker for english.

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