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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/lib/crypto/arm/sha256.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */

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/*

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 * SHA-256 optimized for ARM

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 *

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 * Copyright 2025 Google LLC

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 */

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#include <asm/neon.h>

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#include <crypto/internal/simd.h>

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asmlinkage void sha256_block_data_order(struct sha256_block_state *state,

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					const u8 *data, size_t nblocks);

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asmlinkage void sha256_block_data_order_neon(struct sha256_block_state *state,

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					     const u8 *data, size_t nblocks);

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asmlinkage void sha256_ce_transform(struct sha256_block_state *state,

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				    const u8 *data, size_t nblocks);

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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);

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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);

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static void sha256_blocks(struct sha256_block_state *state,

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			  const u8 *data, size_t nblocks)

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{

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	if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&

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

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		kernel_neon_begin();

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		if (static_branch_likely(&have_ce))

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			sha256_ce_transform(state, data, nblocks);

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		else

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			sha256_block_data_order_neon(state, data, nblocks);

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		kernel_neon_end();

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	} else {

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		sha256_block_data_order(state, data, nblocks);

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	}

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}

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#ifdef CONFIG_KERNEL_MODE_NEON

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#define sha256_mod_init_arch sha256_mod_init_arch

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static inline void sha256_mod_init_arch(void)

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{

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	if (elf_hwcap & HWCAP_NEON) {

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		static_branch_enable(&have_neon);

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		if (elf_hwcap2 & HWCAP2_SHA2)

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			static_branch_enable(&have_ce);

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	}

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}

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#endif /* CONFIG_KERNEL_MODE_NEON */

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