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/* poly1305-internal.h - Poly1305 internals
* Copyright (C) 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
*
* This file is part of Libgcrypt.
*
* Libgcrypt 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.
*
* Libgcrypt 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 this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef G10_POLY1305_INTERNAL_H
#define G10_POLY1305_INTERNAL_H
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "types.h"
#include "g10lib.h"
#include "cipher.h"
#include "bufhelp.h"
#define POLY1305_TAGLEN 16
#define POLY1305_KEYLEN 32
/* Block-size used in default implementation. */
#define POLY1305_REF_BLOCKSIZE 16
/* State size of default implementation. */
#define POLY1305_REF_STATESIZE 64
/* State alignment for default implementation. */
#define POLY1305_REF_ALIGNMENT sizeof(void *)
/* POLY1305_USE_SSE2 indicates whether to compile with AMD64 SSE2 code. */
#undef POLY1305_USE_SSE2
#if defined(__x86_64__) && defined(HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS)
# define POLY1305_USE_SSE2 1
# define POLY1305_SSE2_BLOCKSIZE 32
# define POLY1305_SSE2_STATESIZE 248
# define POLY1305_SSE2_ALIGNMENT 16
#endif
/* Largest block-size used in any implementation (optimized implementations
* might use block-size multiple of 16). */
#ifdef POLY1305_USE_SSE2
# define POLY1305_LARGEST_BLOCKSIZE POLY1305_SSE2_BLOCKSIZE
#else
# define POLY1305_LARGEST_BLOCKSIZE POLY1305_REF_BLOCKSIZE
#endif
/* Largest state-size used in any implementation. */
#ifdef POLY1305_USE_SSE2
# define POLY1305_LARGEST_STATESIZE POLY1305_SSE2_STATESIZE
#else
# define POLY1305_LARGEST_STATESIZE POLY1305_REF_STATESIZE
#endif
/* Minimum alignment for state pointer passed to implementations. */
#ifdef POLY1305_USE_SSE2
# define POLY1305_STATE_ALIGNMENT POLY1305_SSE2_ALIGNMENT
#else
# define POLY1305_STATE_ALIGNMENT POLY1305_REF_ALIGNMENT
#endif
typedef struct poly1305_key_s
{
byte b[POLY1305_KEYLEN];
} poly1305_key_t;
typedef struct poly1305_ops_s
{
size_t block_size;
void (*init_ext) (void *ctx, const poly1305_key_t * key);
unsigned int (*blocks) (void *ctx, const byte * m, size_t bytes);
unsigned int (*finish_ext) (void *ctx, const byte * m, size_t remaining,
byte mac[POLY1305_TAGLEN]);
} poly1305_ops_t;
typedef struct poly1305_context_s
{
byte state[POLY1305_LARGEST_STATESIZE + POLY1305_STATE_ALIGNMENT];
byte buffer[POLY1305_LARGEST_BLOCKSIZE];
const poly1305_ops_t *ops;
unsigned int leftover;
} poly1305_context_t;
gcry_err_code_t _gcry_poly1305_init (poly1305_context_t * ctx, const byte * key,
size_t keylen);
void _gcry_poly1305_finish (poly1305_context_t * ctx,
byte mac[POLY1305_TAGLEN]);
void _gcry_poly1305_update (poly1305_context_t * ctx, const byte * buf,
size_t buflen);
#endif /* G10_POLY1305_INTERNAL_H */
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