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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/lib/crypto/arm/sha1.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */

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/*

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 * SHA-1 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/simd.h>

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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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asmlinkage void sha1_block_data_order(struct sha1_block_state *state,

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				      const u8 *data, size_t nblocks);

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asmlinkage void sha1_transform_neon(struct sha1_block_state *state,

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				    const u8 *data, size_t nblocks);

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asmlinkage void sha1_ce_transform(struct sha1_block_state *state,

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				  const u8 *data, size_t nblocks);

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static void sha1_blocks(struct sha1_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) && likely(may_use_simd())) {

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		scoped_ksimd() {

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			if (static_branch_likely(&have_ce))

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				sha1_ce_transform(state, data, nblocks);

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			else

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				sha1_transform_neon(state, data, nblocks);

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		}

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	} else {

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		sha1_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 sha1_mod_init_arch sha1_mod_init_arch

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static void sha1_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_SHA1)

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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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