iOS WG (1.0.3) - ARM64 SIMD ChaCha20

[Sebastian Gottschall]

Am 20.02.2019 um 16:03 schrieb Lonnie Abelbeck:
> Thanks to Jason and the team, a new iOS WG 1.0.3 appeared as an update:
>
> 1.0.3 / Feb 19, 2019
> --
> Performance should be higher and battery usage lower, thanks to a new ARM64 SIMD implementation of ChaCha20
> --
> For reference, the upstream golang crypto commit is here [1] with performance numbers.
>
> So, the question come to mind, do my iOS devices have ARM64 SIMD support, quick answer is if the device is less than 6 years old it should have ARM64 SIMD support.  Added in the A5/A6 CPU's from what I can tell.

A5 and A6 is 32 bit. A7 was the first 64 bit cpu (introduced with Iphone 5s)

Sebastian

>
> Apple-designed processors
> https://en.wikipedia.org/wiki/Apple-designed_processors
>
> Please correct my research if I over-simplified where the new ARM64 SIMD implementation of ChaCha20 is available for iOS WireGuard.
>
> Lonnie
>
> [1] chacha20: add SIMD implementation on arm64
> https://go.googlesource.com/crypto/+/74369b46fc6756741c016591724fd1cb8e26845f
>
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