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Code Issues Releases Wiki Activity

Add detail about Unicode passwords

This commit is contained in:
Jay Berkenbilt 2018-07-01 17:22:17 -04:00
parent 1bd2a2e79b
commit 7855e18ae2
1 changed files with 13 additions and 3 deletions
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16
TODO
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@ -190,9 +190,19 @@ I find it useful to make reference to them in this list
came from Adobe's example site.
* Consider the possibility of doing something locale-aware to support
non-ASCII passwords. Update documentation if this is done.
Consider implementing full Unicode password algorithms from newer
encryption formats.
non-ASCII passwords. Update documentation if this is done. Consider
implementing full Unicode password algorithms from newer encryption
formats. See ../misc/unicode-password*. If code is added to
properly encode Unicode passwords, figure out how to deal with
backward compatibility. Either require some additional flag to
decode the password or provide a `--raw-password` flag to suppress
decoding. While automatically encoding breaks backward
compatibility, it's probably the right behavior because the current
behavior is arguably a bug. Alternatively, if the password doesn't
work as a raw password and contains characters outside US-ASCII,
try various encoding methods to see if any work. See section
7.6.3.3, algorithms 2 and 2A, in the ISO spec for details. (This is
tracked in https://github.com/qpdf/qpdf/issues/215.)
* See if we can avoid preserving unreferenced objects in object
streams even when preserving the object streams.