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// 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_arch
static 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");
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