Add AMD64 assembly implementation for arcfour
* cipher/Makefile.am: Add 'arcfour-amd64.S'. * cipher/arcfour-amd64.S: New. * cipher/arcfour.c (USE_AMD64_ASM): New. [USE_AMD64_ASM] (ARCFOUR_context, _gcry_arcfour_amd64) (encrypt_stream): New. * configure.ac [host=x86_64]: Add 'arcfour-amd64.lo'.
Patch adds Marc Bevand's public-domain AMD64 assembly implementation of RC4 to
libgcrypt. Original implementation is at:
http://www.zorinaq.com/papers/rc4-amd64.html
Benchmarks on Intel i5-4570 (3200 Mhz):
New:
ARCFOUR | nanosecs/byte mebibytes/sec cycles/byte
STREAM enc | 1.29 ns/B 737.7 MiB/s 4.14 c/B STREAM dec | 1.31 ns/B 730.6 MiB/s 4.18 c/B
Old (C-language):
ARCFOUR | nanosecs/byte mebibytes/sec cycles/byte
STREAM enc | 2.09 ns/B 457.4 MiB/s 6.67 c/B STREAM dec | 2.09 ns/B 457.2 MiB/s 6.68 c/B
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>