Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/lib/crypto/arm/sha1.h
26282 views
1
/* SPDX-License-Identifier: GPL-2.0-or-later */

2
/*

3
 * SHA-1 optimized for ARM

4
 *

5
 * Copyright 2025 Google LLC

6
 */

7
#include <asm/neon.h>

8
#include <asm/simd.h>

9


10
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);

11
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);

12


13
asmlinkage void sha1_block_data_order(struct sha1_block_state *state,

14
				      const u8 *data, size_t nblocks);

15
asmlinkage void sha1_transform_neon(struct sha1_block_state *state,

16
				    const u8 *data, size_t nblocks);

17
asmlinkage void sha1_ce_transform(struct sha1_block_state *state,

18
				  const u8 *data, size_t nblocks);

19


20
static void sha1_blocks(struct sha1_block_state *state,

21
			const u8 *data, size_t nblocks)

22
{

23
	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&

24
	    static_branch_likely(&have_neon) && likely(may_use_simd())) {

25
		kernel_neon_begin();

26
		if (static_branch_likely(&have_ce))

27
			sha1_ce_transform(state, data, nblocks);

28
		else

29
			sha1_transform_neon(state, data, nblocks);

30
		kernel_neon_end();

31
	} else {

32
		sha1_block_data_order(state, data, nblocks);

33
	}

34
}

35


36
#ifdef CONFIG_KERNEL_MODE_NEON

37
#define sha1_mod_init_arch sha1_mod_init_arch

38
static inline void sha1_mod_init_arch(void)

39
{

40
	if (elf_hwcap & HWCAP_NEON) {

41
		static_branch_enable(&have_neon);

42
		if (elf_hwcap2 & HWCAP2_SHA1)

43
			static_branch_enable(&have_ce);

44
	}

45
}

46
#endif /* CONFIG_KERNEL_MODE_NEON */

47


48