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

[Neil Roberts]

If we're looking for something to drop in to Mesa to avoid a dependency
maybe we could look at simpler hashing algorithms too. For the shader
cache presumably we don't care about the hash being cryptographically
secure, just that it is unlikely to *accidentally* make a hash
collision. I think it would be fine to use MD5 in this case so one of
these short implementations might be suitable:

http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
http://people.csail.mit.edu/rivest/Md5.c

- Neil

Emil Velikov <emil.l.velikov at gmail.com> writes:

> 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
>
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