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00d549bb89
Instead of exposing the arm64-optimized SHA-1 code via arm64-specific crypto_shash algorithms, instead just implement the sha1_blocks() library function. This is much simpler, it makes the SHA-1 library functions be arm64-optimized, and it fixes the longstanding issue where the arm64-optimized SHA-1 code was disabled by default. SHA-1 still remains available through crypto_shash, but individual architectures no longer need to handle it. Remove support for SHA-1 finalization from assembly code, since the library does not yet support architecture-specific overrides of the finalization. (Support for that has been omitted for now, for simplicity and because usually it isn't performance-critical.) To match sha1_blocks(), change the type of the nblocks parameter and the return value of __sha1_ce_transform() from int to size_t. Update the assembly code accordingly. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250712232329.818226-9-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
39 lines
951 B
C
39 lines
951 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* SHA-1 optimized for ARM64
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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 <asm/simd.h>
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#include <linux/cpufeature.h>
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
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asmlinkage size_t __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 (static_branch_likely(&have_ce) && likely(may_use_simd())) {
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do {
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size_t rem;
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kernel_neon_begin();
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rem = __sha1_ce_transform(state, data, nblocks);
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kernel_neon_end();
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data += (nblocks - rem) * SHA1_BLOCK_SIZE;
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nblocks = rem;
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} while (nblocks);
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} else {
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sha1_blocks_generic(state, data, nblocks);
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}
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}
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#define sha1_mod_init_arch sha1_mod_init_arch
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static inline void sha1_mod_init_arch(void)
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{
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if (cpu_have_named_feature(SHA1))
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static_branch_enable(&have_ce);
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}
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