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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>
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Poly1305 authenticator algorithm, RFC7539
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*
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* Copyright (C) 2015 Martin Willi
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*
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* Based on public domain code by Andrew Moon and Daniel J. Bernstein.
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*/
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#include <crypto/internal/poly1305.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/unaligned.h>
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#ifdef CONFIG_CRYPTO_LIB_POLY1305_ARCH
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#include "poly1305.h" /* $(SRCARCH)/poly1305.h */
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#else
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#define poly1305_block_init poly1305_block_init_generic
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#define poly1305_blocks poly1305_blocks_generic
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#define poly1305_emit poly1305_emit_generic
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#endif
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void poly1305_init(struct poly1305_desc_ctx *desc,
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const u8 key[POLY1305_KEY_SIZE])
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{
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desc->s[0] = get_unaligned_le32(key + 16);
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desc->s[1] = get_unaligned_le32(key + 20);
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desc->s[2] = get_unaligned_le32(key + 24);
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desc->s[3] = get_unaligned_le32(key + 28);
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desc->buflen = 0;
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poly1305_block_init(&desc->state, key);
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}
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EXPORT_SYMBOL(poly1305_init);
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void poly1305_update(struct poly1305_desc_ctx *desc,
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const u8 *src, unsigned int nbytes)
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{
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if (desc->buflen + nbytes >= POLY1305_BLOCK_SIZE) {
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unsigned int bulk_len;
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if (desc->buflen) {
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unsigned int l = POLY1305_BLOCK_SIZE - desc->buflen;
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memcpy(&desc->buf[desc->buflen], src, l);
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src += l;
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nbytes -= l;
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poly1305_blocks(&desc->state, desc->buf,
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POLY1305_BLOCK_SIZE, 1);
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desc->buflen = 0;
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}
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bulk_len = round_down(nbytes, POLY1305_BLOCK_SIZE);
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nbytes %= POLY1305_BLOCK_SIZE;
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if (bulk_len) {
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poly1305_blocks(&desc->state, src, bulk_len, 1);
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src += bulk_len;
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}
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}
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if (nbytes) {
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memcpy(&desc->buf[desc->buflen], src, nbytes);
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desc->buflen += nbytes;
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}
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}
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EXPORT_SYMBOL(poly1305_update);
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void poly1305_final(struct poly1305_desc_ctx *desc, u8 *dst)
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{
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if (unlikely(desc->buflen)) {
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desc->buf[desc->buflen++] = 1;
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memset(desc->buf + desc->buflen, 0,
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POLY1305_BLOCK_SIZE - desc->buflen);
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poly1305_blocks(&desc->state, desc->buf, POLY1305_BLOCK_SIZE,
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0);
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}
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poly1305_emit(&desc->state.h, dst, desc->s);
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*desc = (struct poly1305_desc_ctx){};
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}
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EXPORT_SYMBOL(poly1305_final);
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#ifdef poly1305_mod_init_arch
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static int __init poly1305_mod_init(void)
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{
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poly1305_mod_init_arch();
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return 0;
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}
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subsys_initcall(poly1305_mod_init);
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static void __exit poly1305_mod_exit(void)
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{
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}
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module_exit(poly1305_mod_exit);
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#endif
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Poly1305 authenticator algorithm, RFC7539");
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