chacha20: add SSSE3 assembly implementation
* cipher/Makefile.am: Add 'chacha20-ssse3-amd64.S'. * cipher/chacha20-ssse3-amd64.S: New. * cipher/chacha20.c (USE_SSSE3): New macro. [USE_SSSE3] (_gcry_chacha20_amd64_ssse3_blocks): New. (chacha20_do_setkey): Select SSSE3 implementation if there is HW support. * configure.ac [host=x86-64]: Add 'chacha20-ssse3-amd64.lo'.
Add SSSE3 optimized implementation for ChaCha20. Based on implementation
by Andrew Moon.
Before (Intel Haswell):
CHACHA20 | nanosecs/byte mebibytes/sec cycles/byte
STREAM enc | 1.97 ns/B 483.6 MiB/s 6.31 c/B STREAM dec | 1.97 ns/B 484.0 MiB/s 6.31 c/B
After:
CHACHA20 | nanosecs/byte mebibytes/sec cycles/byte
STREAM enc | 0.742 ns/B 1284.8 MiB/s 2.38 c/B STREAM dec | 0.741 ns/B 1286.5 MiB/s 2.37 c/B
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>