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

[Jose Fonseca]

On 11/12/14 22:02, Brian Paul wrote:
> On 12/11/2014 02:51 PM, 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.
>
>
> We'll need a solution for Windows too.  I don't have time right now to
> do any research into that.

Yes, ideally we'd have something small that we could bundle into mesa 
source tree, for sake of non Linux OSes.

If Windows was the only concern, we could use its Crypto API, 
http://msdn.microsoft.com/en-us/library/windows/desktop/aa382379.aspx 
and avoid depending on anything else, but some of the above mention 
libraries are not trivial to install.

The other alternative is to disable shader cache when no suitable 
dependency is found. That is, make this an optional dependency.

Jose