mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 16:54:27 +00:00
70cb6ca58f
Instead of exposing the arm-optimized SHA-1 code via arm-specific crypto_shash algorithms, instead just implement the sha1_blocks() library function. This is much simpler, it makes the SHA-1 library functions be arm-optimized, and it fixes the longstanding issue where the arm-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. To match sha1_blocks(), change the type of the nblocks parameter of the assembly functions from int to size_t. The assembly functions actually already treated it as size_t. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250712232329.818226-8-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* SHA-1 optimized for ARM
|
|
*
|
|
* Copyright 2025 Google LLC
|
|
*/
|
|
#include <asm/neon.h>
|
|
#include <asm/simd.h>
|
|
|
|
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
|
|
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_ce);
|
|
|
|
asmlinkage void sha1_block_data_order(struct sha1_block_state *state,
|
|
const u8 *data, size_t nblocks);
|
|
asmlinkage void sha1_transform_neon(struct sha1_block_state *state,
|
|
const u8 *data, size_t nblocks);
|
|
asmlinkage void sha1_ce_transform(struct sha1_block_state *state,
|
|
const u8 *data, size_t nblocks);
|
|
|
|
static void sha1_blocks(struct sha1_block_state *state,
|
|
const u8 *data, size_t nblocks)
|
|
{
|
|
if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) &&
|
|
static_branch_likely(&have_neon) && likely(may_use_simd())) {
|
|
kernel_neon_begin();
|
|
if (static_branch_likely(&have_ce))
|
|
sha1_ce_transform(state, data, nblocks);
|
|
else
|
|
sha1_transform_neon(state, data, nblocks);
|
|
kernel_neon_end();
|
|
} else {
|
|
sha1_block_data_order(state, data, nblocks);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_KERNEL_MODE_NEON
|
|
#define sha1_mod_init_arch sha1_mod_init_arch
|
|
static inline void sha1_mod_init_arch(void)
|
|
{
|
|
if (elf_hwcap & HWCAP_NEON) {
|
|
static_branch_enable(&have_neon);
|
|
if (elf_hwcap2 & HWCAP2_SHA1)
|
|
static_branch_enable(&have_ce);
|
|
}
|
|
}
|
|
#endif /* CONFIG_KERNEL_MODE_NEON */
|