eax.h

/* eax.h
 *
 * EAX mode, see http://www.cs.ucdavis.edu/~rogaway/papers/eax.pdf
 */

/* nettle, low-level cryptographics library
 *
 * Copyright (C) 2013 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_EAX_H_INCLUDED
#define NETTLE_EAX_H_INCLUDED

#include "aes.h"

#ifdef __cplusplus
extern "C" {
#endif

/* Name mangling */
#define eax_set_key nettle_eax_set_key
#define eax_set_nonce nettle_eax_set_nonce
#define eax_update nettle_eax_update
#define eax_encrypt nettle_eax_encrypt
#define eax_decrypt nettle_eax_decrypt
#define eax_digest nettle_eax_digest

#define eax_aes128_set_key nettle_eax_aes128_set_key
#define eax_aes128_set_nonce nettle_eax_aes128_set_nonce
#define eax_aes128_update nettle_eax_aes128_update
#define eax_aes128_encrypt nettle_eax_aes128_encrypt
#define eax_aes128_decrypt nettle_eax_aes128_decrypt
#define eax_aes128_digest nettle_eax_aes128_digest

/* Restricted to block ciphers with 128 bit block size. FIXME: Reflect
   this in naming? */

#define EAX_BLOCK_SIZE 16
#define EAX_DIGEST_SIZE 16
/* FIXME: Reasonable default? */
#define EAX_IV_SIZE 16

/* Values independent of message and nonce */
struct eax_key
{
  union nettle_block16 pad_block;
  union nettle_block16 pad_partial;
};

struct eax_ctx
{
  union nettle_block16 omac_nonce;
  union nettle_block16 omac_data;
  union nettle_block16 omac_message;
  union nettle_block16 ctr;