[linux-2.6-block.git] / include / crypto / poly1305.h

/* 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);

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
2546f811 MW	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
878afc35 EB	16	struct poly1305_key {
	17	u32 r[5]; /* key, base 2^26 */
	18	};
	19
	20	struct poly1305_state {
	21	u32 h[5]; /* accumulator, base 2^26 */
	22	};
	23
2546f811 MW	24	struct poly1305_desc_ctx {
2546f811 MW	25	/* key */
878afc35	26	struct poly1305_key r;
2546f811 MW	27	/* finalize key */
	28	u32 s[4];
	29	/* accumulator */
878afc35	30	struct poly1305_state h;
2546f811 MW	31	/* partial buffer */
	32	u8 buf[POLY1305_BLOCK_SIZE];
	33	/* bytes used in partial buffer */
	34	unsigned int buflen;
	35	/* r key has been set */
	36	bool rset;
	37	/* s key has been set */
	38	bool sset;
	39	};
	40
1b6fd3d5 EB	41	/*
	42	* Poly1305 core functions. These implement the ε-almost-∆-universal hash
	43	* function underlying the Poly1305 MAC, i.e. they don't add an encrypted nonce
	44	* ("s key") at the end. They also only support block-aligned inputs.
	45	*/
	46	void poly1305_core_setkey(struct poly1305_key key, const u8 raw_key);
	47	static inline void poly1305_core_init(struct poly1305_state *state)
	48	{
	49	memset(state->h, 0, sizeof(state->h));
	50	}
	51	void poly1305_core_blocks(struct poly1305_state *state,
	52	const struct poly1305_key *key,
	53	const void *src, unsigned int nblocks);
	54	void poly1305_core_emit(const struct poly1305_state state, void dst);
	55
	56	/* Crypto API helper functions for the Poly1305 MAC */
2546f811	57	int crypto_poly1305_init(struct shash_desc *desc);
2546f811 MW	58	unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
	59	const u8 *src, unsigned int srclen);
	60	int crypto_poly1305_update(struct shash_desc *desc,
	61	const u8 *src, unsigned int srclen);
	62	int crypto_poly1305_final(struct shash_desc desc, u8 dst);
	63
	64	#endif