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b646b782e5
Consolidate the Poly1305 code into a single module, similar to various other algorithms (SHA-1, SHA-256, SHA-512, etc.): - Each arch now provides a header file lib/crypto/$(SRCARCH)/poly1305.h, replacing lib/crypto/$(SRCARCH)/poly1305*.c. The header defines poly1305_block_init(), poly1305_blocks(), poly1305_emit(), and optionally poly1305_mod_init_arch(). It is included by lib/crypto/poly1305.c, and thus the code gets built into the single libpoly1305 module, with improved inlining in some cases. - Whether arch-optimized Poly1305 is buildable is now controlled centrally by lib/crypto/Kconfig instead of by lib/crypto/$(SRCARCH)/Kconfig. The conditions for enabling it remain the same as before, and it remains enabled by default. (The PPC64 one remains unconditionally disabled due to 'depends on BROKEN'.) - Any additional arch-specific translation units for the optimized Poly1305 code, such as assembly files, are now compiled by lib/crypto/Makefile instead of lib/crypto/$(SRCARCH)/Makefile. A special consideration is needed because the Adiantum code uses the poly1305_core_*() functions directly. For now, just carry forward that approach. This means retaining the CRYPTO_LIB_POLY1305_GENERIC kconfig symbol, and keeping the poly1305_core_*() functions in separate translation units. So it's not quite as streamlined I've done with the other hash functions, but we still get a single libpoly1305 module. Note: to see the diff from the arm, arm64, and x86 .c files to the new .h files, view this commit with 'git show -M10'. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20250829152513.92459-3-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* OpenSSL/Cryptogams accelerated Poly1305 transform for ARM
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*
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* Copyright (C) 2019 Linaro Ltd. <ard.biesheuvel@linaro.org>
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*/
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#include <asm/hwcap.h>
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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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#include <linux/jump_label.h>
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#include <linux/kernel.h>
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asmlinkage void poly1305_block_init(struct poly1305_block_state *state,
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const u8 raw_key[POLY1305_BLOCK_SIZE]);
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asmlinkage void poly1305_blocks_arm(struct poly1305_block_state *state,
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const u8 *src, u32 len, u32 hibit);
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asmlinkage void poly1305_blocks_neon(struct poly1305_block_state *state,
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const u8 *src, u32 len, u32 hibit);
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asmlinkage void poly1305_emit(const struct poly1305_state *state,
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u8 digest[POLY1305_DIGEST_SIZE],
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const u32 nonce[4]);
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);
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static void poly1305_blocks(struct poly1305_block_state *state, const u8 *src,
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unsigned int len, u32 padbit)
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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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do {
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unsigned int todo = min_t(unsigned int, len, SZ_4K);
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kernel_neon_begin();
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poly1305_blocks_neon(state, src, todo, padbit);
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kernel_neon_end();
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len -= todo;
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src += todo;
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} while (len);
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} else
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poly1305_blocks_arm(state, src, len, padbit);
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}
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#ifdef CONFIG_KERNEL_MODE_NEON
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#define poly1305_mod_init_arch poly1305_mod_init_arch
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static void poly1305_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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}
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#endif /* CONFIG_KERNEL_MODE_NEON */
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