crypto: arm64/speck - add NEON-accelerated implementation of Speck-XTS
Add a NEON-accelerated implementation of Speck128-XTS and Speck64-XTS
for ARM64. This is ported from the 32-bit version. It may be useful on
devices with 64-bit ARM CPUs that don't have the Cryptography
Extensions, so cannot do AES efficiently -- e.g. the Cortex-A53
processor on the Raspberry Pi 3.
It generally works the same way as the 32-bit version, but there are
some slight differences due to the different instructions, registers,
and syntax available in ARM64 vs. in ARM32. For example, in the 64-bit
version there are enough registers to hold the XTS tweaks for each
128-byte chunk, so they don't need to be saved on the stack.
Benchmarks on a Raspberry Pi 3 running a 64-bit kernel:
The code performs well on higher-end ARM64 processors as well, though
such processors tend to have the Crypto Extensions which make AES
preferred. For example, here are the same benchmarks run on a HiKey960
(with CPU affinity set for the A73 cores), with the Crypto Extensions
implementation of AES-256-XTS added:
projects / users / jedix / linux-maple.git / commit