Nico Weber 57768325cc LibPDF: Implement 7.6.4.4.11 Algorithm 12: Authenticating owner password ...

...for handlers of revision 6.

Since this adds U to the hash input, also trim the size of U and O to
48 bytes. The spec requires them to be 48 bytes, but all the newer PDFs
on https://cipa.jp/e/std/std-sec.html have 127 bytes -- 48 real bytes
and 79 nul padding bytes. These files were created by:

    Creator: Word 用 Acrobat PDFMaker 17
    Producer: Adobe PDF Library 15.0

and

    Creator: Word 用 Acrobat PDFMaker 17
    Producer: Adobe PDF Library 17.11.238

2023-07-21 11:55:20 +02:00

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