sha1.h

 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
10static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
11
12asmlinkage size_t __sha1_ce_transform(struct sha1_block_state *state,
13				      const u8 *data, size_t nblocks);
14
15static 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
34static void sha1_mod_init_arch(void)
35{
36	if (cpu_have_named_feature(SHA1))
37		static_branch_enable(&have_ce);
38}