[PATCH v4] crypto: arm64/sha2: integrate OpenSSL implementations of SHA256/SHA512

[Will Deacon]

On Sun, Nov 20, 2016 at 11:42:01AM +0000, Ard Biesheuvel wrote:
> This integrates both the accelerated scalar and the NEON implementations
> of SHA-224/256 as well as SHA-384/512 from the OpenSSL project.
> 
> Relative performance compared to the respective generic C versions:
> 
>                  |  SHA256-scalar  | SHA256-NEON* |  SHA512  |
>      ------------+-----------------+--------------+----------+
>      Cortex-A53  |      1.63x      |     1.63x    |   2.34x  |
>      Cortex-A57  |      1.43x      |     1.59x    |   1.95x  |
>      Cortex-A73  |      1.26x      |     1.56x    |     ?    |
> 
> The core crypto code was authored by Andy Polyakov of the OpenSSL
> project, in collaboration with whom the upstream code was adapted so
> that this module can be built from the same version of sha512-armv8.pl.
> 
> The version in this patch was taken from OpenSSL commit 32bbb62ea634
> ("sha/asm/sha512-armv8.pl: fix big-endian support in __KERNEL__ case.")
> 
> * The core SHA algorithm is fundamentally sequential, but there is a
>   secondary transformation involved, called the schedule update, which
>   can be performed independently. The NEON version of SHA-224/SHA-256
>   only implements this part of the algorithm using NEON instructions,
>   the sequential part is always done using scalar instructions.
> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
> ---
>  arch/arm64/crypto/Kconfig               |    8 +
>  arch/arm64/crypto/Makefile              |   17 +
>  arch/arm64/crypto/sha256-core.S_shipped | 2061 ++++++++++++++++++++
>  arch/arm64/crypto/sha256-glue.c         |  185 ++
>  arch/arm64/crypto/sha512-armv8.pl       |  778 ++++++++
>  arch/arm64/crypto/sha512-core.S_shipped | 1085 +++++++++++
>  arch/arm64/crypto/sha512-glue.c         |   94 +
>  7 files changed, 4228 insertions(+)

If I build a kernel with this applied and CRYPTO_SHA{256,512}_ARM64=y,
then I end up with untracked .S files according to git:

$ git status
Untracked files:
	arch/arm64/crypto/sha256-core.S
	arch/arm64/crypto/sha512-core.S

Will