1/*
2 * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stddef.h>
11
12#define POLY1305_BLOCK_SIZE 16
13#define POLY1305_DIGEST_SIZE 16
14#define POLY1305_KEY_SIZE 32
15
16typedef struct poly1305_context POLY1305;
17
18typedef void (*poly1305_blocks_f) (void *ctx, const unsigned char *inp,
19 size_t len, unsigned int padbit);
20typedef void (*poly1305_emit_f) (void *ctx, unsigned char mac[16],
21 const unsigned int nonce[4]);
22
23struct poly1305_context {
24 double opaque[24]; /* large enough to hold internal state, declared
25 * 'double' to ensure at least 64-bit invariant
26 * alignment across all platforms and
27 * configurations */
28 unsigned int nonce[4];
29 unsigned char data[POLY1305_BLOCK_SIZE];
30 size_t num;
31 struct {
32 poly1305_blocks_f blocks;
33 poly1305_emit_f emit;
34 } func;
35};
36
37size_t Poly1305_ctx_size(void);
38void Poly1305_Init(POLY1305 *ctx, const unsigned char key[32]);
39void Poly1305_Update(POLY1305 *ctx, const unsigned char *inp, size_t len);
40void Poly1305_Final(POLY1305 *ctx, unsigned char mac[16]);
41