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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101// SPDX-License-Identifier: GPL-2.0-or-later/* * Poly1305 authenticator algorithm, RFC7539 * * Copyright (C) 2015 Martin Willi * * Based on public domain code by Andrew Moon and Daniel J. Bernstein. */
#include <crypto/internal/poly1305.h>#include <linux/export.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/string.h>#include <linux/unaligned.h>
#ifdef CONFIG_CRYPTO_LIB_POLY1305_ARCH#include "poly1305.h" /* $(SRCARCH)/poly1305.h */#else#define poly1305_block_init poly1305_block_init_generic#define poly1305_blocks poly1305_blocks_generic#define poly1305_emit poly1305_emit_generic#endif
void poly1305_init(struct poly1305_desc_ctx *desc, const u8 key[POLY1305_KEY_SIZE]){ desc->s[0] = get_unaligned_le32(key + 16); desc->s[1] = get_unaligned_le32(key + 20); desc->s[2] = get_unaligned_le32(key + 24); desc->s[3] = get_unaligned_le32(key + 28); desc->buflen = 0; poly1305_block_init(&desc->state, key);}EXPORT_SYMBOL(poly1305_init);
void poly1305_update(struct poly1305_desc_ctx *desc, const u8 *src, unsigned int nbytes){ if (desc->buflen + nbytes >= POLY1305_BLOCK_SIZE) { unsigned int bulk_len;
if (desc->buflen) { unsigned int l = POLY1305_BLOCK_SIZE - desc->buflen;
memcpy(&desc->buf[desc->buflen], src, l); src += l; nbytes -= l;
poly1305_blocks(&desc->state, desc->buf, POLY1305_BLOCK_SIZE, 1); desc->buflen = 0; }
bulk_len = round_down(nbytes, POLY1305_BLOCK_SIZE); nbytes %= POLY1305_BLOCK_SIZE;
if (bulk_len) { poly1305_blocks(&desc->state, src, bulk_len, 1); src += bulk_len; } } if (nbytes) { memcpy(&desc->buf[desc->buflen], src, nbytes); desc->buflen += nbytes; }}EXPORT_SYMBOL(poly1305_update);
void poly1305_final(struct poly1305_desc_ctx *desc, u8 *dst){ if (unlikely(desc->buflen)) { desc->buf[desc->buflen++] = 1; memset(desc->buf + desc->buflen, 0, POLY1305_BLOCK_SIZE - desc->buflen); poly1305_blocks(&desc->state, desc->buf, POLY1305_BLOCK_SIZE, 0); }
poly1305_emit(&desc->state.h, dst, desc->s); *desc = (struct poly1305_desc_ctx){};}EXPORT_SYMBOL(poly1305_final);
#ifdef poly1305_mod_init_archstatic int __init poly1305_mod_init(void){ poly1305_mod_init_arch(); return 0;}subsys_initcall(poly1305_mod_init);
static void __exit poly1305_mod_exit(void){}module_exit(poly1305_mod_exit);#endif
MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Poly1305 authenticator algorithm, RFC7539");