/* poly1305.h
 *
 * Copyright (C) 2006-2017 wolfSSL Inc.
 *
 * This file is part of wolfSSL.
 *
 * wolfSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * wolfSSL 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
 */


#ifndef WOLF_CRYPT_POLY1305_H
# define WOLF_CRYPT_POLY1305_H

# include <wolfssl/wolfcrypt/types.h>

# ifdef HAVE_POLY1305

#  ifdef __cplusplus
extern "C" {
#  endif

/* auto detect between 32bit / 64bit */
#  if defined(__SIZEOF_INT128__) && defined(__LP64__)
#   define WC_HAS_SIZEOF_INT128_64BIT
#  endif

#  if defined(_MSC_VER) && defined(_M_X64)
#   define WC_HAS_MSVC_64BIT
#  endif

#  if (defined(__GNUC__) && defined(__LP64__) && \
    ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 4))))
#   define WC_HAS_GCC_4_4_64BIT
#  endif

#  ifdef USE_INTEL_SPEEDUP
#  elif (defined(WC_HAS_SIZEOF_INT128_64BIT) || defined(WC_HAS_MSVC_64BIT) ||  \
    defined(WC_HAS_GCC_4_4_64BIT))
#   define POLY130564
#  else
#   define POLY130532
#  endif

enum {
    POLY1305             = 7,
    POLY1305_BLOCK_SIZE  = 16,
    POLY1305_DIGEST_SIZE = 16,
};

#  define WC_POLY1305_PAD_SZ 16
#  define WC_POLY1305_MAC_SZ 16

/* Poly1305 state */
typedef struct Poly1305 {
    #  ifdef USE_INTEL_SPEEDUP
    word64        r[3];
    word64        h[3];
    word64        pad[2];
    word64        hh[14];
    word32        r0[8];
    word32        r1[8];
    word32        r2[8];
    word32        r3[8];
    word32        r4[8];
    word32 *      rp[4];
    word64        hibit[4];
    size_t        leftover;
    unsigned char buffer[4 * POLY1305_BLOCK_SIZE];
    unsigned char finished;
    unsigned char started;
    #  else // ifdef USE_INTEL_SPEEDUP
    #   if defined(POLY130564)
    word64        r[3];
    word64        h[3];
    word64        pad[2];
    #   else
    word32        r[5];
    word32        h[5];
    word32        pad[4];
    #   endif
    size_t        leftover;
    unsigned char buffer[POLY1305_BLOCK_SIZE];
    unsigned char finished;
    #  endif // ifdef USE_INTEL_SPEEDUP
} Poly1305;

/* does init */

WOLFSSL_API int
wc_Poly1305SetKey(Poly1305 * poly1305, const byte * key,
  word32 kySz);
WOLFSSL_API int wc_Poly1305Update(Poly1305 * poly1305, const byte *, word32);
WOLFSSL_API int
wc_Poly1305Final(Poly1305 * poly1305, byte * tag);
WOLFSSL_API int
wc_Poly1305_MAC(Poly1305 * ctx, byte * additional, word32 addSz,
  byte * input, word32 sz, byte * tag, word32 tagSz);
#  ifdef __cplusplus
} /* extern "C" */
#  endif

# endif /* HAVE_POLY1305 */
#endif  /* WOLF_CRYPT_POLY1305_H */
