/*      $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_block_size 16

typedef struct poly1305_state {
        unsigned long r[5];
        unsigned long h[5];
        unsigned long pad[4];
        size_t leftover;
        unsigned char buffer[poly1305_block_size];
        unsigned char final;
} poly1305_state;

void    poly1305_init(poly1305_state *, const unsigned char[32]);
void    poly1305_update(poly1305_state *, const unsigned char *, size_t);
void    poly1305_finish(poly1305_state *, unsigned char[16]);

#endif  /* _POLY1305_H_ */