[poppler] RFC: Crypto and poppler

[Brad Hards]

On Thu, 7 Jul 2005 03:33 am, Kristian Høgsberg wrote:
> Brad Hards wrote:
> > To support PDF 1.6 (ie Acrobat 7), we need to support AES decryption (or
> > encryption, its symmetric). Now that could be coded, but I'm a bit
> > reluctant to do so, because crypto is so messy, and hardware acceleration
> > is so useful.
> >
> > I have a couple of ideas:
> > 1. Rely on an external library (probably something like libgcrypt,
> > although Botan might also be a possibility)
> > 2. Provide hooks for plugable crypto implementions
> > 3. Code it.
> >
> > Right now, I'm thinking about the first one as the likely best bet.
> > libgcrypt might also replace the alleged RC4 and MD5 stuff.
> >
> > Thoughts?
>
> I'd say 1, certainly -- libgcrypt sounds like a good choice.  We've been
> moving away from 3 in a number of places in poppler already (libjpeg,
> zlib) so that's out.  What would be the benefit of 2?
2 would provide the capability to hook into hardware based encryption devices 
which might make a lot of difference for embedded apps. Now I think about it, 
gcrypt also has a pluggable API (although I haven't used it).

Brad
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