/*
     This file is part of GNUnet.
     Copyright (C) 2002-2015 GNUnet e.V.

     GNUnet is free software: you can redistribute it and/or modify it
     under the terms of the GNU Affero General Public License as published
     by the Free Software Foundation, either version 3 of the License,
     or (at your option) any later version.

     GNUnet 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
     Affero General Public License for more details.

     You should have received a copy of the GNU Affero General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later

 */
/**
 * @file util/test_crypto_ecdh_eddsa.c
 * @brief testcase for ECC DH key exchange with EdDSA private keys.
 * @author Christian Grothoff
 * @author Bart Polot
 */
#include "platform.h"
#include "gnunet_util_lib.h"
#include <gcrypt.h>


static int
test_ecdh()
{
  struct GNUNET_CRYPTO_EddsaPrivateKey *priv_dsa;
  struct GNUNET_CRYPTO_EcdhePrivateKey *priv_ecdh;
  struct GNUNET_CRYPTO_EddsaPublicKey id1;
  struct GNUNET_CRYPTO_EcdhePublicKey id2;
  struct GNUNET_HashCode dh[2];

  /* Generate keys */
  priv_dsa = GNUNET_CRYPTO_eddsa_key_create();
  GNUNET_CRYPTO_eddsa_key_get_public(priv_dsa,
                                     &id1);
  for (unsigned int j = 0; j < 4; j++)
    {
      fprintf(stderr, ",");
      priv_ecdh = GNUNET_CRYPTO_ecdhe_key_create();
      /* Extract public keys */
      GNUNET_CRYPTO_ecdhe_key_get_public(priv_ecdh,
                                         &id2);
      /* Do ECDH */
      GNUNET_assert(GNUNET_OK ==
                    GNUNET_CRYPTO_eddsa_ecdh(priv_dsa,
                                             &id2,
                                             &dh[0]));
      GNUNET_assert(GNUNET_OK ==
                    GNUNET_CRYPTO_ecdh_eddsa(priv_ecdh,
                                             &id1,
                                             &dh[1]));
      /* Check that both DH results are equal. */
      GNUNET_assert(0 == memcmp(&dh[0],
                                &dh[1],
                                sizeof(struct GNUNET_HashCode)));
      GNUNET_free(priv_ecdh);
    }
  GNUNET_free(priv_dsa);
  return 0;
}


int
main(int argc, char *argv[])
{
  if (!gcry_check_version("1.6.0"))
    {
      fprintf(stderr,
              _("libgcrypt has not the expected version (version %s is required).\n"),
              "1.6.0");
      return 0;
    }
  if (getenv("GNUNET_GCRYPT_DEBUG"))
    gcry_control(GCRYCTL_SET_DEBUG_FLAGS, 1u, 0);
  GNUNET_log_setup("test-crypto-ecdh-eddsa", "WARNING", NULL);
  for (unsigned int i = 0; i < 4; i++)
    {
      fprintf(stderr,
              ".");
      if (0 != test_ecdh())
        return 1;
    }
  return 0;
}


/* end of test_crypto_ecdh_eddsa.c */