/*      $OpenBSD: poly1305.h,v 1.2 2020/07/22 13:54:30 tobhe Exp $      */
/*
 * Public Domain poly1305 from Andrew Moon
 *
 * poly1305 implementation using 32 bit * 32 bit = 64 bit multiplication
 * and 64 bit addition from https://github.com/floodyberry/poly1305-donna
 */

#ifndef _POLY1305_H_
#define _POLY1305_H_

#define POLY1305_KEY_SIZE       32
#define POLY1305_BLOCK_SIZE     16
#define POLY1305_MAC_SIZE       16

typedef struct poly1305_state {
        unsigned long r[5];
        unsigned long h[5];
        unsigned long pad[4];
        size_t leftover;
        uint8_t buffer[POLY1305_BLOCK_SIZE];
        uint8_t final;
} poly1305_state;

void    poly1305_init(poly1305_state *, const uint8_t[POLY1305_KEY_SIZE]);
void    poly1305_update(poly1305_state *, const uint8_t *, size_t);
void    poly1305_finish(poly1305_state *, uint8_t[POLY1305_MAC_SIZE]);

#endif  /* _POLY1305_H_ */