2 * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
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
10 #ifndef OSSL_CRYPTO_POLY1305_H
11 # define OSSL_CRYPTO_POLY1305_H
16 #define POLY1305_BLOCK_SIZE 16
17 #define POLY1305_DIGEST_SIZE 16
18 #define POLY1305_KEY_SIZE 32
20 typedef struct poly1305_context POLY1305;
22 typedef void (*poly1305_blocks_f) (void *ctx, const unsigned char *inp,
23 size_t len, unsigned int padbit);
24 typedef void (*poly1305_emit_f) (void *ctx, unsigned char mac[16],
25 const unsigned int nonce[4]);
27 struct poly1305_context {
28 double opaque[24]; /* large enough to hold internal state, declared
29 * 'double' to ensure at least 64-bit invariant
30 * alignment across all platforms and
32 unsigned int nonce[4];
33 unsigned char data[POLY1305_BLOCK_SIZE];
36 poly1305_blocks_f blocks;
41 size_t Poly1305_ctx_size(void);
42 void Poly1305_Init(POLY1305 *ctx, const unsigned char key[32]);
43 void Poly1305_Update(POLY1305 *ctx, const unsigned char *inp, size_t len);
44 void Poly1305_Final(POLY1305 *ctx, unsigned char mac[16]);
46 #endif /* OSSL_CRYPTO_POLY1305_H */