/* aead-encrypt-msg.c
 */

/* nettle, low-level cryptographics library
 *
 * Copyright (C) 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.
 */

#if HAVE_CONFIG_H
# include "config.h"
#endif

#include "aead.h"

#include "nettle-meta.h"

size_t
aead_encrypt_msg_size(const struct nettle_aead *aead, size_t size)
{
  return size + aead->digest_size;
}

void
aead_encrypt_msg (const struct nettle_aead *aead,
		  void *ctx, const uint8_t *nonce,
		  size_t ad_size, const uint8_t *ad,
		  size_t plaintext_size,
		  uint8_t *gibberish, const uint8_t *plaintext)
{
  /* Allow NULL nonce, for the case that the caller already has done
     that. E.g., if the application uses a nonce size different from
     aead->nonce_size. */
  if (nonce)
    aead->set_nonce (ctx, nonce);
  aead->update (ctx, ad_size, ad);
  aead->encrypt (ctx, plaintext_size, gibberish, plaintext);
  aead->digest (ctx, aead->digest_size, gibberish + plaintext_size);
}