1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 10 #include <asm/simd.h> 11 #include <linux/cpufeature.h> 12 13 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_sha3); 14 15 asmlinkage void sha3_ce_transform(struct sha3_state *state, const u8 *data, 16 size_t nblocks, size_t block_size); 17 18 static void sha3_absorb_blocks(struct sha3_state *state, const u8 *data, 19 size_t nblocks, size_t block_size) 20 { 21 if (static_branch_likely(&have_sha3) && likely(may_use_simd())) { 22 scoped_ksimd() 23 sha3_ce_transform(state, data, nblocks, block_size); 24 } else { 25 sha3_absorb_blocks_generic(state, data, nblocks, block_size); 26 } 27 } 28 29 static void sha3_keccakf(struct sha3_state *state) 30 { 31 if (static_branch_likely(&have_sha3) && likely(may_use_simd())) { 32 /* 33 * Passing zeroes into sha3_ce_transform() gives the plain 34 * Keccak-f permutation, which is what we want here. Any 35 * supported block size may be used. Use SHA3_512_BLOCK_SIZE 36 * since it's the shortest. 37 */ 38 static const u8 zeroes[SHA3_512_BLOCK_SIZE]; 39 40 scoped_ksimd() 41 sha3_ce_transform(state, zeroes, 1, sizeof(zeroes)); 42 } else { 43 sha3_keccakf_generic(state); 44 } 45 } 46 47 #define sha3_mod_init_arch sha3_mod_init_arch 48 static void sha3_mod_init_arch(void) 49 { 50 if (cpu_have_named_feature(SHA3)) 51 static_branch_enable(&have_sha3); 52 } 53