Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/lib/crypto/x86/sha256.h
26292 views
1
/* SPDX-License-Identifier: GPL-2.0-or-later */

2
/*

3
 * SHA-256 optimized for x86_64

4
 *

5
 * Copyright 2025 Google LLC

6
 */

7
#include <asm/fpu/api.h>

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

9
#include <linux/static_call.h>

10


11
DEFINE_STATIC_CALL(sha256_blocks_x86, sha256_blocks_generic);

12


13
#define DEFINE_X86_SHA256_FN(c_fn, asm_fn)                                 \

14
	asmlinkage void asm_fn(struct sha256_block_state *state,           \

15
			       const u8 *data, size_t nblocks);            \

16
	static void c_fn(struct sha256_block_state *state, const u8 *data, \

17
			 size_t nblocks)                                   \

18
	{                                                                  \

19
		if (likely(crypto_simd_usable())) {                        \

20
			kernel_fpu_begin();                                \

21
			asm_fn(state, data, nblocks);                      \

22
			kernel_fpu_end();                                  \

23
		} else {                                                   \

24
			sha256_blocks_generic(state, data, nblocks);       \

25
		}                                                          \

26
	}

27


28
DEFINE_X86_SHA256_FN(sha256_blocks_ssse3, sha256_transform_ssse3);

29
DEFINE_X86_SHA256_FN(sha256_blocks_avx, sha256_transform_avx);

30
DEFINE_X86_SHA256_FN(sha256_blocks_avx2, sha256_transform_rorx);

31
DEFINE_X86_SHA256_FN(sha256_blocks_ni, sha256_ni_transform);

32


33
static void sha256_blocks(struct sha256_block_state *state,

34
			  const u8 *data, size_t nblocks)

35
{

36
	static_call(sha256_blocks_x86)(state, data, nblocks);

37
}

38


39
#define sha256_mod_init_arch sha256_mod_init_arch

40
static inline void sha256_mod_init_arch(void)

41
{

42
	if (boot_cpu_has(X86_FEATURE_SHA_NI)) {

43
		static_call_update(sha256_blocks_x86, sha256_blocks_ni);

44
	} else if (cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,

45
				     NULL) &&

46
		   boot_cpu_has(X86_FEATURE_AVX)) {

47
		if (boot_cpu_has(X86_FEATURE_AVX2) &&

48
		    boot_cpu_has(X86_FEATURE_BMI2))

49
			static_call_update(sha256_blocks_x86,

50
					   sha256_blocks_avx2);

51
		else

52
			static_call_update(sha256_blocks_x86,

53
					   sha256_blocks_avx);

54
	} else if (boot_cpu_has(X86_FEATURE_SSSE3)) {

55
		static_call_update(sha256_blocks_x86, sha256_blocks_ssse3);

56
	}

57
}

58


59