[Mesa-dev] [PATCH] mesa: Add mesa SHA-1 functions

[Kenneth Graunke]

On Sunday, December 14, 2014 03:06:41 PM Emil Velikov wrote:
> On 11/12/14 21:51, Carl Worth wrote:
> > From: Kristian Høgsberg <krh at bitplanet.net>
> > 
> > The upcoming shader cache uses the SHA-1 algorithm for cryptographic
> > naming. These new mesa_sha1 functions are implemented with the nettle
> > library.
> > ---
> > 
> > This patch is another in support of my upcoming shader-cache work. Thanks to
> > Kritian for coding this piece.
> > 
> > As currently written, this patch introduces a new dependency of Mesa on the
> > Nettle library to implement SHA-1. I'm open to recommendations if people would prefer some other option.
> > 
> > For example, the xserver can be configured to get a SHA-1 implementation from
> > libmd, libc, CommonCrypto, CryptoAPI, libnettle, libgcrypt, libsha1, or
> > openssl.
> > 
> > I don't know if it's important to offer as many options as that, which is why
> > I'm asking for opinions here.
> > 
> Hi Carl,
> 
> Can we try to avoid adding new dependencies to mesa unless absolutely
> needed. Neither of the proprietary drivers does so presently, so it will
> be nice to keep the trend.
> 
> While currently the steam runtime does not include libnettle I can
> envision one day that they will/might. Even with steam aside I think
> that this might cause issues with gnome & others' sandboxing.
> 
> Long story short - can we import a sha1 implementation from another
> project ? It will save us the "libstdc++ style steam runtime" issues,
> plus it will ease the question of what to do under Windows :)
> 
> 
> Thanks
> Emil

FWIW, when I hacked together a shader cache proof of concept, I imported
smallsha1, which is just a pair of .cpp/.h files:

https://code.google.com/p/smallsha1/

It's BSD-3-Clause - my main criteria was that it had to be permissively
licensed.  Having the implementation in a single file is nice as well.

--Ken
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