phc-discussions - Re: [PHC] Argon2

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Date: Tue, 31 Mar 2015 18:35:30 +0300
From: Solar Designer <solar@...nwall.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Argon2

On Tue, Mar 31, 2015 at 03:04:43PM +0100, Samuel Neves wrote:
> On 31-03-2015 14:30, Solar Designer wrote:
> >>>         blake2b_update(&BlakeHash, (const uint8_t*)&lanes, sizeof(lanes));
> > [...]
> >
> > Surely blake2b_update() then uses its own choice of integer or SIMD
> > types for this data.
> 
> The BLAKE2 code does not treat input bytes as anything other than bytes. Whenever there is a need to convert bytes to
> integers, this is done in a standards-compliant way (using either memcpy to a local variable, or plain load-shift-or).

Thanks!  Yes, blake2b_update() appears to always hit a memcpy() on "in".

Perhaps that's the way to write such functions these days, although there
must be a performance hit from this when running on an architecture such
as x86 that would permit you to access integers in "in" directly.

Alexander