/* SPDX-License-Identifier: GPL-2.0 */


#ifndef _CRYPTO_POLY1305_H
#define _CRYPTO_POLY1305_H

#include <linux/types.h>

#define POLY1305_BLOCK_SIZE	16
#define POLY1305_KEY_SIZE	32
#define POLY1305_DIGEST_SIZE	16



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_block_state {
	
	struct poly1305_state h;
	
	union {
		struct poly1305_key opaque_r[CONFIG_CRYPTO_LIB_POLY1305_RSIZE];
		struct poly1305_core_key core_r;
	};
};

struct poly1305_desc_ctx {
	
	u8 buf[POLY1305_BLOCK_SIZE];
	
	unsigned int buflen;
	
	u32 s[4];
	struct poly1305_block_state state;
};

void poly1305_init(struct poly1305_desc_ctx *desc,
		   const u8 key[at_least POLY1305_KEY_SIZE]);
void poly1305_update(struct poly1305_desc_ctx *desc,
		     const u8 *src, unsigned int nbytes);
void poly1305_final(struct poly1305_desc_ctx *desc, u8 *digest);

#endif
