Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/lib/crypto/arm64/sha256.h
26285 views
1
/* SPDX-License-Identifier: GPL-2.0-or-later */

2
/*

3
 * SHA-256 optimized for ARM64

4
 *

5
 * Copyright 2025 Google LLC

6
 */

7
#include <asm/neon.h>

8
#include <crypto/internal/simd.h>

9
#include <linux/cpufeature.h>

10


11
asmlinkage void sha256_block_data_order(struct sha256_block_state *state,

12
					const u8 *data, size_t nblocks);

13
asmlinkage void sha256_block_neon(struct sha256_block_state *state,

14
				  const u8 *data, size_t nblocks);

15
asmlinkage size_t __sha256_ce_transform(struct sha256_block_state *state,

16
					const u8 *data, size_t nblocks);

17


18
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);

19
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);

20


21
static void sha256_blocks(struct sha256_block_state *state,

22
			  const u8 *data, size_t nblocks)

23
{

24
	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&

25
	    static_branch_likely(&have_neon) && crypto_simd_usable()) {

26
		if (static_branch_likely(&have_ce)) {

27
			do {

28
				size_t rem;

29


30
				kernel_neon_begin();

31
				rem = __sha256_ce_transform(state,

32
							    data, nblocks);

33
				kernel_neon_end();

34
				data += (nblocks - rem) * SHA256_BLOCK_SIZE;

35
				nblocks = rem;

36
			} while (nblocks);

37
		} else {

38
			kernel_neon_begin();

39
			sha256_block_neon(state, data, nblocks);

40
			kernel_neon_end();

41
		}

42
	} else {

43
		sha256_block_data_order(state, data, nblocks);

44
	}

45
}

46


47
#ifdef CONFIG_KERNEL_MODE_NEON

48
#define sha256_mod_init_arch sha256_mod_init_arch

49
static inline void sha256_mod_init_arch(void)

50
{

51
	if (cpu_have_named_feature(ASIMD)) {

52
		static_branch_enable(&have_neon);

53
		if (cpu_have_named_feature(SHA2))

54
			static_branch_enable(&have_ce);

55
	}

56
}

57
#endif /* CONFIG_KERNEL_MODE_NEON */

58


59