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https://issues.apache.org/jira/browse/PDFBOX-3173?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr updated PDFBOX-3173:
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Description:
Changes in PDFBOX-2801 and PDFBOX-2469 result in the signature dictionary not
being decrypted in encrypted files. Because these aren't visible signatures,
this is noticed only when looking at the signature dictionary in PDFDebugger.
See also this thread in the dev mailing list:
https://mail-archives.apache.org/mod_mbox/pdfbox-dev/201512.mbox/browser
Example files:
- PDFBOX-2711
- 045697.pdf
- 050289.pdf
- 070413.pdf
I hit that problem while wondering what to do about PDFBOX-2729, and wondered
why the "too good to be true" solution of [~GGlad] worked at all, because his
solution did encrypt the signature parts.
I did not find anything in the "32000" spec that the signature dictionary is
not to be encrypted.
>From [~msahyoun]:
{quote}
>From ISO32000-2:
Encryption applies to all strings and streams in the document's PDF file, with
the following exceptions:
The values for the ID entry in the trailer
Any strings in an Encrypt dictionary
Any strings that are inside streams such as content streams and compressed
object streams, which themselves are encrypted
Any hexadecimal strings representing the value of the Contents key in a
Signature dictionary
{quote}
was:
Changes in PDFBOX-2801 and PDFBOX-2469 result in the signature dictionary not
being decrypted in encrypted files. Because these aren't visible signatures,
this is noticed only when looking at the signature dictionary in PDFDebugger.
Example files:
- PDFBOX-2711
- 045697.pdf
- 050289.pdf
- 070413.pdf
I hit that problem while wondering what to do about PDFBOX-2729, and wondered
why the "too good to be true" solution of [~GGlad] worked at all, because his
solution did encrypt the signature parts.
I did not find anything in the "32000" spec that the signature dictionary is
not to be encrypted.
>From [~msahyoun]:
{quote}
>From ISO32000-2:
Encryption applies to all strings and streams in the document's PDF file, with
the following exceptions:
The values for the ID entry in the trailer
Any strings in an Encrypt dictionary
Any strings that are inside streams such as content streams and compressed
object streams, which themselves are encrypted
Any hexadecimal strings representing the value of the Contents key in a
Signature dictionary
{quote}
> Signature dictionary is not decrypted in encrypted files
> --------------------------------------------------------
>
> Key: PDFBOX-3173
> URL: https://issues.apache.org/jira/browse/PDFBOX-3173
> Project: PDFBox
> Issue Type: Bug
> Components: Crypto
> Affects Versions: 2.0.0
> Reporter: Tilman Hausherr
> Attachments: 045697.pdf, 050289.pdf, 070413.pdf
>
>
> Changes in PDFBOX-2801 and PDFBOX-2469 result in the signature dictionary not
> being decrypted in encrypted files. Because these aren't visible signatures,
> this is noticed only when looking at the signature dictionary in PDFDebugger.
> See also this thread in the dev mailing list:
> https://mail-archives.apache.org/mod_mbox/pdfbox-dev/201512.mbox/browser
> Example files:
> - PDFBOX-2711
> - 045697.pdf
> - 050289.pdf
> - 070413.pdf
> I hit that problem while wondering what to do about PDFBOX-2729, and wondered
> why the "too good to be true" solution of [~GGlad] worked at all, because his
> solution did encrypt the signature parts.
> I did not find anything in the "32000" spec that the signature dictionary is
> not to be encrypted.
> From [~msahyoun]:
> {quote}
> From ISO32000-2:
> Encryption applies to all strings and streams in the document's PDF file,
> with the following exceptions:
> The values for the ID entry in the trailer
> Any strings in an Encrypt dictionary
> Any strings that are inside streams such as content streams and compressed
> object streams, which themselves are encrypted
> Any hexadecimal strings representing the value of the Contents key in a
> Signature dictionary
> {quote}
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