1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Common values for the Poly1305 algorithm
 4 */
 5
 6#ifndef _CRYPTO_POLY1305_H
 7#define _CRYPTO_POLY1305_H
 8
 9#include <linux/types.h>
10#include <linux/crypto.h>
11
12#define POLY1305_BLOCK_SIZE	16
13#define POLY1305_KEY_SIZE	32
14#define POLY1305_DIGEST_SIZE	16
15
16struct poly1305_desc_ctx {
17	/* key */
18	u32 r[5];
19	/* finalize key */
20	u32 s[4];
21	/* accumulator */
22	u32 h[5];
23	/* partial buffer */
24	u8 buf[POLY1305_BLOCK_SIZE];
25	/* bytes used in partial buffer */
26	unsigned int buflen;
27	/* r key has been set */
28	bool rset;
29	/* s key has been set */
30	bool sset;
31};
32
33int crypto_poly1305_init(struct shash_desc *desc);
34unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
35					const u8 *src, unsigned int srclen);
36int crypto_poly1305_update(struct shash_desc *desc,
37			   const u8 *src, unsigned int srclen);
38int crypto_poly1305_final(struct shash_desc *desc, u8 *dst);
39
40#endif