1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * SHA-1 optimized for ARM64 4 * 5 * Copyright 2025 Google LLC 6 */ 7 #include <asm/simd.h> 8 #include <linux/cpufeature.h> 9 10 static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce); 11 12 asmlinkage size_t __sha1_ce_transform(struct sha1_block_state *state, 13 const u8 *data, size_t nblocks); 14 15 static void sha1_blocks(struct sha1_block_state *state, 16 const u8 *data, size_t nblocks) 17 { 18 if (static_branch_likely(&have_ce) && likely(may_use_simd())) { 19 do { 20 size_t rem; 21 22 scoped_ksimd() 23 rem = __sha1_ce_transform(state, data, nblocks); 24 25 data += (nblocks - rem) * SHA1_BLOCK_SIZE; 26 nblocks = rem; 27 } while (nblocks); 28 } else { 29 sha1_blocks_generic(state, data, nblocks); 30 } 31 } 32 33 #define sha1_mod_init_arch sha1_mod_init_arch 34 static void sha1_mod_init_arch(void) 35 { 36 if (cpu_have_named_feature(SHA1)) 37 static_branch_enable(&have_ce); 38 } 39