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/* Chacha20 implementation, used on arc4random.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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.
The GNU C Library 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 the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <isa-level.h>
#include <ldsodefs.h>
#include <cpu-features.h>
#include <sys/param.h>
unsigned int __chacha20_sse2_blocks4 (uint32_t *state, uint8_t *dst,
const uint8_t *src, size_t nblks)
attribute_hidden;
unsigned int __chacha20_avx2_blocks8 (uint32_t *state, uint8_t *dst,
const uint8_t *src, size_t nblks)
attribute_hidden;
static inline void
chacha20_crypt (uint32_t *state, uint8_t *dst, const uint8_t *src,
size_t bytes)
{
_Static_assert (CHACHA20_BUFSIZE % 4 == 0 && CHACHA20_BUFSIZE % 8 == 0,
"CHACHA20_BUFSIZE not multiple of 4 or 8");
_Static_assert (CHACHA20_BUFSIZE >= CHACHA20_BLOCK_SIZE * 8,
"CHACHA20_BUFSIZE < CHACHA20_BLOCK_SIZE * 8");
#if MINIMUM_X86_ISA_LEVEL > 2
__chacha20_avx2_blocks8 (state, dst, src,
CHACHA20_BUFSIZE / CHACHA20_BLOCK_SIZE);
#else
const struct cpu_features* cpu_features = __get_cpu_features ();
/* AVX2 version uses vzeroupper, so disable it if RTM is enabled. */
if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2)
&& X86_ISA_CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_VZEROUPPER, !))
__chacha20_avx2_blocks8 (state, dst, src,
CHACHA20_BUFSIZE / CHACHA20_BLOCK_SIZE);
else
__chacha20_sse2_blocks4 (state, dst, src,
CHACHA20_BUFSIZE / CHACHA20_BLOCK_SIZE);
#endif
}
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