xref: /linux/lib/crypto/arm64/sha1.h (revision 7fc2cd2e4b398c57c9cf961cfea05eadbf34c05c)
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