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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 <ldsodefs.h>
#include <stdbool.h>
unsigned int __chacha20_neon_blocks4 (uint32_t *state, uint8_t *dst,
const uint8_t *src, size_t nblks)
attribute_hidden;
static void
chacha20_crypt (uint32_t *state, uint8_t *dst, const uint8_t *src,
size_t bytes)
{
_Static_assert (CHACHA20_BUFSIZE % 4 == 0,
"CHACHA20_BUFSIZE not multiple of 4");
_Static_assert (CHACHA20_BUFSIZE > CHACHA20_BLOCK_SIZE * 4,
"CHACHA20_BUFSIZE <= CHACHA20_BLOCK_SIZE * 4");
#ifdef __AARCH64EL__
__chacha20_neon_blocks4 (state, dst, src,
CHACHA20_BUFSIZE / CHACHA20_BLOCK_SIZE);
#else
chacha20_crypt_generic (state, dst, src, bytes);
#endif
}
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