[poppler] RFC: Crypto and poppler

[Kristian Høgsberg]

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?

Kristian