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/* poly1305-aes.h
*
* Poly1305 message authentication code.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2013 Nikos Mavrogiannopoulos
*
* 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
#ifdef __cplusplus
extern "C" {
#endif
/* Low level functions/macros for the poly1305 construction.
* For the macros to be useful include macros.h
*/
#include "nettle-types.h"
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 nonce[16];
uint8_t block[16];
unsigned index;
};
/* All-in-one context, with cipher, and state. Cipher must have a 128-bit block */
#define POLY1305_CTX(type) \
{ struct poly1305_ctx pctx; type cipher; }
#define poly1305_set_key nettle_poly1305_set_key
#define poly1305_set_nonce nettle_poly1305_set_nonce
#define poly1305_block nettle_poly1305_block
#define poly1305_digest nettle_poly1305_digest
void poly1305_set_key(struct poly1305_ctx *ctx, const uint8_t key[16]);
void poly1305_set_nonce (struct poly1305_ctx *ctx, const uint8_t * nonce);
void poly1305_block (struct poly1305_ctx *ctx, const uint8_t m[16]);
void poly1305_digest (struct poly1305_ctx *ctx,
size_t length, uint8_t *digest, const uint8_t *s);
#define POLY1305_SET_KEY(ctx, set_key, key) \
do { \
poly1305_set_key(&(ctx)->pctx, (key+16)); \
(set_key)(&(ctx)->cipher, 16, (key)); \
(ctx)->pctx.index = 0; \
} while (0)
#define POLY1305_SET_NONCE(ctx, data) \
poly1305_set_nonce(&(ctx)->pctx, (data))
#define _POLY1305_BLOCK(ctx, block) do { \
poly1305_block(ctx, block); \
} while (0)
#define POLY1305_UPDATE(ctx, length, data) \
MD_UPDATE (&(ctx)->pctx, (length), (data), _POLY1305_BLOCK, (void) 0)
#define POLY1305_DIGEST(ctx, encrypt, length, digest) \
do { \
uint8_t _ts[16]; \
(encrypt)(&(ctx)->cipher, 16, _ts, (ctx)->pctx.nonce); \
poly1305_digest (&(ctx)->pctx, (length), (digest), _ts); \
INCREMENT (16, (ctx)->pctx.nonce); \
(ctx)->pctx.index = 0; \
} while(0);
#ifdef __cplusplus
}
#endif
#endif /* NETTLE_POLY1305_H_INCLUDED */
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