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/* SPDX-License-Identifier: GPL-2.0 */
* Common values for the Poly1305 algorithm
#ifndef _CRYPTO_POLY1305_H
#define _CRYPTO_POLY1305_H
#include <linux/types.h>
#include <linux/crypto.h>
#define POLY1305_BLOCK_SIZE 16
#define POLY1305_KEY_SIZE 32
#define POLY1305_DIGEST_SIZE 16
struct poly1305_key {
u32 r[5]; /* key, base 2^26 */
struct poly1305_state {
u32 h[5]; /* accumulator, base 2^26 */
struct poly1305_desc_ctx {
/* key */
struct poly1305_key r;
/* finalize key */
u32 s[4];
/* accumulator */
struct poly1305_state h;
/* partial buffer */
u8 buf[POLY1305_BLOCK_SIZE];
/* bytes used in partial buffer */
unsigned int buflen;
/* r key has been set */
bool rset;
/* s key has been set */
bool sset;
* Poly1305 core functions. These implement the ε-almost-∆-universal hash
* function underlying the Poly1305 MAC, i.e. they don't add an encrypted nonce
* ("s key") at the end. They also only support block-aligned inputs.
void poly1305_core_setkey(struct poly1305_key *key, const u8 *raw_key);
static inline void poly1305_core_init(struct poly1305_state *state)
memset(state->h, 0, sizeof(state->h));
void poly1305_core_blocks(struct poly1305_state *state,
const struct poly1305_key *key,
const void *src, unsigned int nblocks);
void poly1305_core_emit(const struct poly1305_state *state, void *dst);
/* Crypto API helper functions for the Poly1305 MAC */
int crypto_poly1305_init(struct shash_desc *desc);
unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
const u8 *src, unsigned int srclen);
int crypto_poly1305_update(struct shash_desc *desc,
const u8 *src, unsigned int srclen);
int crypto_poly1305_final(struct shash_desc *desc, u8 *dst);