[linux-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

/* The poly1305_key and poly1305_state types are mostly opaque and
 * implementation-defined. Limbs might be in base 2^64 or base 2^26, or
 * different yet. The union type provided keeps these 64-bit aligned for the
 * case in which this is implemented using 64x64 multiplies.
 */

struct poly1305_key {
	union {
		u32 r[5];
		u64 r64[3];
	};
};

struct poly1305_core_key {
	struct poly1305_key key;
	struct poly1305_key precomputed_s;
};

struct poly1305_state {
	union {
		u32 h[5];
		u64 h64[3];
	};
};

struct poly1305_desc_ctx {
	/* partial buffer */
	u8 buf[POLY1305_BLOCK_SIZE];
	/* bytes used in partial buffer */
	unsigned int buflen;
	/* how many keys have been set in r[] */
	unsigned short rset;
	/* whether s[] has been set */
	bool sset;
	/* finalize key */
	u32 s[4];
	/* accumulator */
	struct poly1305_state h;
	/* key */
	union {
		struct poly1305_key opaque_r[CONFIG_CRYPTO_LIB_POLY1305_RSIZE];
		struct poly1305_core_key core_r;
	};
};

void poly1305_init_arch(struct poly1305_desc_ctx *desc, const u8 *key);
void poly1305_init_generic(struct poly1305_desc_ctx *desc, const u8 *key);

static inline void poly1305_init(struct poly1305_desc_ctx *desc, const u8 *key)
{
	if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
		poly1305_init_arch(desc, key);
	else
		poly1305_init_generic(desc, key);
}

void poly1305_update_arch(struct poly1305_desc_ctx *desc, const u8 *src,
			  unsigned int nbytes);
void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src,
			     unsigned int nbytes);

static inline void poly1305_update(struct poly1305_desc_ctx *desc,
				   const u8 *src, unsigned int nbytes)
{
	if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
		poly1305_update_arch(desc, src, nbytes);
	else
		poly1305_update_generic(desc, src, nbytes);
}

void poly1305_final_arch(struct poly1305_desc_ctx *desc, u8 *digest);
void poly1305_final_generic(struct poly1305_desc_ctx *desc, u8 *digest);

static inline void poly1305_final(struct poly1305_desc_ctx *desc, u8 *digest)
{
	if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
		poly1305_final_arch(desc, digest);
	else
		poly1305_final_generic(desc, digest);
}

#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
1c08a104 JD	16	/* The poly1305_key and poly1305_state types are mostly opaque and
	17	* implementation-defined. Limbs might be in base 2^64 or base 2^26, or
	18	* different yet. The union type provided keeps these 64-bit aligned for the
	19	* case in which this is implemented using 64x64 multiplies.
	20	*/
	21
878afc35	22	struct poly1305_key {
1c08a104 JD	23	union {
	24	u32 r[5];
	25	u64 r64[3];
	26	};
	27	};
	28
	29	struct poly1305_core_key {
	30	struct poly1305_key key;
	31	struct poly1305_key precomputed_s;
878afc35 EB	32	};
	33
	34	struct poly1305_state {
1c08a104 JD	35	union {
	36	u32 h[5];
	37	u64 h64[3];
	38	};
878afc35 EB	39	};
878afc35 EB	40
2546f811	41	struct poly1305_desc_ctx {
2546f811 MW	42	/* partial buffer */
	43	u8 buf[POLY1305_BLOCK_SIZE];
	44	/* bytes used in partial buffer */
	45	unsigned int buflen;
ad8f5b88 AB	46	/* how many keys have been set in r[] */
	47	unsigned short rset;
	48	/* whether s[] has been set */
2546f811	49	bool sset;
ad8f5b88 AB	50	/* finalize key */
	51	u32 s[4];
	52	/* accumulator */
	53	struct poly1305_state h;
	54	/* key */
1c08a104 JD	55	union {
	56	struct poly1305_key opaque_r[CONFIG_CRYPTO_LIB_POLY1305_RSIZE];
	57	struct poly1305_core_key core_r;
	58	};
2546f811 MW	59	};
2546f811 MW	60
a1d93064 AB	61	void poly1305_init_arch(struct poly1305_desc_ctx desc, const u8 key);
	62	void poly1305_init_generic(struct poly1305_desc_ctx desc, const u8 key);
	63
	64	static inline void poly1305_init(struct poly1305_desc_ctx desc, const u8 key)
	65	{
	66	if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
	67	poly1305_init_arch(desc, key);
	68	else
	69	poly1305_init_generic(desc, key);
	70	}
	71
	72	void poly1305_update_arch(struct poly1305_desc_ctx desc, const u8 src,
	73	unsigned int nbytes);
	74	void poly1305_update_generic(struct poly1305_desc_ctx desc, const u8 src,
	75	unsigned int nbytes);
	76
	77	static inline void poly1305_update(struct poly1305_desc_ctx *desc,
	78	const u8 *src, unsigned int nbytes)
	79	{
	80	if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
	81	poly1305_update_arch(desc, src, nbytes);
	82	else
	83	poly1305_update_generic(desc, src, nbytes);
	84	}
	85
	86	void poly1305_final_arch(struct poly1305_desc_ctx desc, u8 digest);
	87	void poly1305_final_generic(struct poly1305_desc_ctx desc, u8 digest);
	88
	89	static inline void poly1305_final(struct poly1305_desc_ctx desc, u8 digest)
	90	{
	91	if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
	92	poly1305_final_arch(desc, digest);
	93	else
	94	poly1305_final_generic(desc, digest);
	95	}
	96
2546f811	97	#endif