Re: [PATCH 0/2] crypto: arm64/ARM: NEON accelerated ChaCha20

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On 27 December 2016 at 15:36, Jeffrey Walton <noloader@xxxxxxxxx> wrote:
>> ChaCha20 is a stream cipher described in RFC 7539, and is intended to be
>> an efficient software implementable 'standby cipher', in case AES cannot
>> be used.
>
> That's not quite correct.
>
> The IETF changed the algorithm a bit, and its not compatible with
> Bernstein's ChaCha. They probably should have differentiated the name
> to avoid this sort of confusion.
>
> You can find Bernstein's specification for ChaCha at
> https://cr.yp.to/chacha.html, and the test vectors for Bernstein's
> specification at
> http://tools.ietf.org/html/draft-strombergson-chacha-test-vectors.
>

Thanks for the clarification. However, this should not affect the
content of the patches: they simply reimplement in ARM SIMD what the
kernel already knows as "chacha20", which is the IETF derivative
rather than djb's original. I will mention this in the cover letter of
the next respin (given that I need to respin these anyway)
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