/* 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 . */ #include #include 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 }