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84cfc6479b
glibc/LICENSES
Adhemerval Zanella Netto 84cfc6479b x86: Add AVX2 optimized chacha20 
It adds vectorized ChaCha20 implementation based on libgcrypt
cipher/chacha20-amd64-avx2.S.  It is used only if AVX2 is supported
and enabled by the architecture.

As for generic implementation, the last step that XOR with the
input is omited.  The final state register clearing is also
omitted.

On a Ryzen 9 5900X it shows the following improvements (using
formatted bench-arc4random data):

SSE                                        MB/s
-----------------------------------------------
arc4random [single-thread]               704.25
arc4random_buf(16) [single-thread]      1018.17
arc4random_buf(32) [single-thread]      1315.27
arc4random_buf(48) [single-thread]      1449.36
arc4random_buf(64) [single-thread]      1511.16
arc4random_buf(80) [single-thread]      1539.48
arc4random_buf(96) [single-thread]      1571.06
arc4random_buf(112) [single-thread]     1596.16
arc4random_buf(128) [single-thread]     1613.48
-----------------------------------------------

AVX2                                       MB/s
-----------------------------------------------
arc4random [single-thread]               922.61
arc4random_buf(16) [single-thread]      1478.70
arc4random_buf(32) [single-thread]      2241.80
arc4random_buf(48) [single-thread]      2681.28
arc4random_buf(64) [single-thread]      2913.43
arc4random_buf(80) [single-thread]      3009.73
arc4random_buf(96) [single-thread]      3141.16
arc4random_buf(112) [single-thread]     3254.46
arc4random_buf(128) [single-thread]     3305.02
-----------------------------------------------

Checked on x86_64-linux-gnu.
2022-07-22 11:58:27 -03:00

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sysdeps/aarch64/chacha20-aarch64.S, sysdeps/x86_64/chacha20-amd64-sse2.S,
and sysdeps/x86_64/chacha20-amd64-avx2.S imports code from libgcrypt,
with the following notices:
Copyright (C) 2017-2019 Jussi Kivilinna <jussi.kivilinna@iki.fi>
This file is part of Libgcrypt.
Libgcrypt is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
Libgcrypt is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, see <https://www.gnu.org/licenses/>.
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