[jira] [Created] (PDFBOX-3971) Add Certificate Dictionary to seed value in signature field

["Hossam Hazem (JIRA)" <ji...@apache.org>]

Hossam Hazem created PDFBOX-3971:
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             Summary: Add Certificate Dictionary to seed value in signature field
                 Key: PDFBOX-3971
                 URL: https://issues.apache.org/jira/browse/PDFBOX-3971
             Project: PDFBox
          Issue Type: Improvement
          Components: Signing
            Reporter: Hossam Hazem
         Attachments: COSName.patch, PDSeedValue.patch, PDSeedValueCertificate.java

This dictionary is important as it gives the ability to put certificate constraints on a signature field, like if you want signatures that are signed by a specific issuer or authority to only be used in a field.

currently tested Issuer constraint and it worked, acrobat reader ignores other certificates and only allow the issuer given to sign the field. documentation is not complete waiting for the initial acceptance to complete.

new class PDSeedValueCertificate is added which refers to this certificate.
PDSeedValue is modified to add the new dictionary.
COSName is modified to add the new pdf names that are included in the dictionary.

reference for this dictionary can be found in PDF reference 1.7 section 12.7.4.5 table 235 page 457 in here http://www.adobe.com/content/dam/acom/en/devnet/pdf/PDF32000_2008.pdf
 or chapter 8 table 8.84 page 700 in here http://archimedespalimpsest.net/Documents/External/pdf_reference_1-7.pdf

and in here
https://www.adobe.com/devnet-docs/acrobatetk/tools/DigSig/Acrobat_DigitalSignatures_in_PDF.pdf

this is my first contribution, hope everything goes well.



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