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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>
75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Poly1305 authenticator algorithm, RFC7539.
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*
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* Copyright 2023- IBM Corp. All rights reserved.
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*/
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#include <asm/switch_to.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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#include <linux/unaligned.h>
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asmlinkage void poly1305_p10le_4blocks(struct poly1305_block_state *state, const u8 *m, u32 mlen);
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asmlinkage void poly1305_64s(struct poly1305_block_state *state, const u8 *m, u32 mlen, int highbit);
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asmlinkage void poly1305_emit_64(const struct poly1305_state *state, const u32 nonce[4], u8 digest[POLY1305_DIGEST_SIZE]);
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_p10);
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static void vsx_begin(void)
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{
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preempt_disable();
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enable_kernel_vsx();
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}
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static void vsx_end(void)
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{
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disable_kernel_vsx();
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preempt_enable();
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}
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static void poly1305_block_init(struct poly1305_block_state *dctx,
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const u8 raw_key[POLY1305_BLOCK_SIZE])
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{
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if (!static_key_enabled(&have_p10))
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return poly1305_block_init_generic(dctx, raw_key);
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dctx->h = (struct poly1305_state){};
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dctx->core_r.key.r64[0] = get_unaligned_le64(raw_key + 0);
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dctx->core_r.key.r64[1] = get_unaligned_le64(raw_key + 8);
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}
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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 (!static_key_enabled(&have_p10))
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return poly1305_blocks_generic(state, src, len, padbit);
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vsx_begin();
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if (len >= POLY1305_BLOCK_SIZE * 4) {
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poly1305_p10le_4blocks(state, src, len);
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src += len - (len % (POLY1305_BLOCK_SIZE * 4));
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len %= POLY1305_BLOCK_SIZE * 4;
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}
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while (len >= POLY1305_BLOCK_SIZE) {
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poly1305_64s(state, src, POLY1305_BLOCK_SIZE, padbit);
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len -= POLY1305_BLOCK_SIZE;
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src += POLY1305_BLOCK_SIZE;
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}
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vsx_end();
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}
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static void poly1305_emit(const struct poly1305_state *state,
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u8 digest[POLY1305_DIGEST_SIZE], const u32 nonce[4])
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{
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if (!static_key_enabled(&have_p10))
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return poly1305_emit_generic(state, digest, nonce);
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poly1305_emit_64(state, nonce, digest);
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}
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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 (cpu_has_feature(CPU_FTR_ARCH_31))
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static_branch_enable(&have_p10);
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}
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