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* cipher/Makefile.am: Add 'chacha20-armv7-neon.S'.
* cipher/chacha20-armv7-neon.S: New.
* cipher/chacha20.c (USE_NEON): New.
[USE_NEON] (_gcry_chacha20_armv7_neon_blocks): New.
(chacha20_do_setkey) [USE_NEON]: Use Neon implementation if
HWF_ARM_NEON flag set.
(selftest): Self-test encrypting buffer byte by byte.
* configure.ac [neonsupport=yes]: Add 'chacha20-armv7-neon.lo'.
--
Add Andrew Moon's public domain ARMv7/NEON implementation of ChaCha20. Original
source is available at: https://github.com/floodyberry/chacha-opt
Benchmark on Cortex-A8 (--cpu-mhz 1008):
Old:
CHACHA20 | nanosecs/byte mebibytes/sec cycles/byte
STREAM enc | 13.45 ns/B 70.92 MiB/s 13.56 c/B
STREAM dec | 13.45 ns/B 70.90 MiB/s 13.56 c/B
New:
CHACHA20 | nanosecs/byte mebibytes/sec cycles/byte
STREAM enc | 6.20 ns/B 153.9 MiB/s 6.25 c/B
STREAM dec | 6.20 ns/B 153.9 MiB/s 6.25 c/B
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
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