poly1305.h

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/*
 * Copyright (C) 2016 Andrew Moon (dedicated to the public domain)
 * Copyright (C) 2018 Freie Universität Berlin
 * Copyright (C) 2018 Inria
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stddef.h>
#include <stdint.h>

#define POLY1305_BLOCK_SIZE 16

typedef struct {
    uint32_t r[4];                          
    uint32_t pad[4];                        
    uint32_t h[5];                          
    uint32_t c[4];                          
    size_t c_idx;                           
} poly1305_ctx_t;

void poly1305_init(poly1305_ctx_t *ctx, const uint8_t *key);

void poly1305_update(poly1305_ctx_t *ctx, const uint8_t *data, size_t len);

void poly1305_finish(poly1305_ctx_t *ctx, uint8_t *mac);

void poly1305_auth(uint8_t *mac, const uint8_t *data, size_t len,
                   const uint8_t *key);
 
#ifdef __cplusplus
}
#endif