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/* poly1305.h
*
* Poly1305 message authentication code.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2013 Nikos Mavrogiannopoulos
* Copyright (C) 2013, 2014 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#ifndef NETTLE_POLY1305_H_INCLUDED
#define NETTLE_POLY1305_H_INCLUDED
#include "aes.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Name mangling */
#define poly1305_set_key nettle_poly1305_set_key
#define poly1305_update nettle_poly1305_update
#define poly1305_block nettle_poly1305_block
#define poly1305_digest nettle_poly1305_digest
#define poly1305_aes_set_key nettle_poly1305_aes_set_key
#define poly1305_aes_set_nonce nettle_poly1305_aes_set_nonce
#define poly1305_aes_digest nettle_poly1305_aes_digest
/* Low level functions/macros for the poly1305 construction. */
#define POLY1305_DIGEST_SIZE 16
#define POLY1305_BLOCK_SIZE 16
#define POLY1305_KEY_SIZE 16
struct poly1305_ctx {
/* Key, 128-bit value and some cached multiples. */
union
{
uint32_t r32[6];
uint64_t r64[3];
} r;
uint32_t s32[3];
/* State, represented as words of 26, 32 or 64 bits, depending on
implementation. */
/* High bits first, to maintain alignment. */
uint32_t hh;
union
{
uint32_t h32[4];
uint64_t h64[2];
} h;
uint8_t block[POLY1305_BLOCK_SIZE];
unsigned index;
};
void poly1305_set_key(struct poly1305_ctx *ctx, const uint8_t key[POLY1305_KEY_SIZE]);
void poly1305_block (struct poly1305_ctx *ctx, const uint8_t m[POLY1305_BLOCK_SIZE],
unsigned high);
void poly1305_update (struct poly1305_ctx *ctx, size_t size, const uint8_t *data);
void poly1305_digest (struct poly1305_ctx *ctx,
size_t length, uint8_t *digest, const uint8_t *s);
/* poly1305-aes */
#define POLY1305_AES_KEY_SIZE 32
#define POLY1305_AES_DIGEST_SIZE 16
#define POLY1305_AES_NONCE_SIZE 16
struct poly1305_aes_ctx
{
/* Must be first element, for the poly1305_aes_update cast to work. */
struct poly1305_ctx pctx;
uint8_t nonce[POLY1305_BLOCK_SIZE];
struct aes128_ctx aes;
};
/* Also initialize the nonce to zero. */
void
poly1305_aes_set_key (struct poly1305_aes_ctx *ctx, const uint8_t *key);
/* Optional, if not used, messages get incrementing nonces starting from zero. */
void
poly1305_aes_set_nonce (struct poly1305_aes_ctx *ctx,
const uint8_t *nonce);
/* An alias, nothing aes-specific. */
#define poly1305_aes_update \
(*(void(*)(struct poly1305_aes_ctx *, size_t, const uint8_t *))&poly1305_update)
/* Also increments the nonce */
void
poly1305_aes_digest (struct poly1305_aes_ctx *ctx,
size_t length, uint8_t *digest);
#ifdef __cplusplus
}
#endif
#endif /* NETTLE_POLY1305_H_INCLUDED */
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