• Eric Biggers's avatar
    crypto: arm64/speck - add NEON-accelerated implementation of Speck-XTS · 91a2abb7
    Eric Biggers authored
    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:
    
       Algorithm                              Encryption     Decryption
       ---------                              ----------     ----------
       Speck64/128-XTS (NEON)                 92.2 MB/s      92.2 MB/s
       Speck128/256-XTS (NEON)                75.0 MB/s      75.0 MB/s
       Speck128/256-XTS (generic)             47.4 MB/s      35.6 MB/s
       AES-128-XTS (NEON bit-sliced)          33.4 MB/s      29.6 MB/s
       AES-256-XTS (NEON bit-sliced)          24.6 MB/s      21.7 MB/s
    
    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:
    
       Algorithm                              Encryption     Decryption
       ---------                              -----------    -----------
       AES-256-XTS (Crypto Extensions)        1273.3 MB/s    1274.7 MB/s
       Speck64/128-XTS (NEON)                  359.8 MB/s     348.0 MB/s
       Speck128/256-XTS (NEON)                 292.5 MB/s     286.1 MB/s
       Speck128/256-XTS (generic)              186.3 MB/s     181.8 MB/s
       AES-128-XTS (NEON bit-sliced)           142.0 MB/s     124.3 MB/s
       AES-256-XTS (NEON bit-sliced)           104.7 MB/s      91.1 MB/s
    Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
    Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
    91a2abb7
Makefile 2.5 KB