[FFmpeg-devel] [PATCH] support encrypted asf

[Reimar Döffinger]

Hello,
On Wed, Oct 10, 2007 at 12:28:21AM +0100, M?ns Rullg?rd wrote:
> Michael Niedermayer <michaelni at gmx.at> writes:
> > On Wed, Oct 10, 2007 at 12:05:23AM +0200, Reimar D?ffinger wrote:
> > [...]
> >> [... DES code ...]
> >> > hmm, this doesnt look remotely optimal, maybe you should look at 
> >> > john the ripper IIRC it contains quite fast DES code. though surely far too
> >> > messy for us to use directly but i guess the ideas used in it could be
> >> > applied to our code as well
> >> 
> >> DES is a mess as it is, it seems unlikely it well ever get any new use,
> >
> > then why is it used in asf DRM?
> 
> Because asf is a mess?

Also because it is quite old (encryption seems to have stayed the same
since v1 of the DRM) and because (since it is DRM) it has to rely on
obscurity anyway, so using more secure encryption is not that helpful.
Concerning simplicity of the versions using tables: replacing code by
mysterious and unexplained tables is not my idea of simplification ;-)
I'll try to find the DES implementation you mentioned and see if it is
less horrible...

Greetings,
Reimar D?ffinger