C++ (Cpp) gcry_mac_open Examples

Example #1

File: bench-slope.c Project: HoraceWeebler/libgcrypt

static int
bench_mac_init (struct bench_obj *obj)
{
  struct bench_mac_mode *mode = obj->priv;
  gcry_mac_hd_t hd;
  int err;
  unsigned int keylen;
  void *key;

  obj->min_bufsize = BUF_START_SIZE;
  obj->max_bufsize = BUF_END_SIZE;
  obj->step_size = BUF_STEP_SIZE;
  obj->num_measure_repetitions = num_measurement_repetitions;

  keylen = gcry_mac_get_algo_keylen (mode->algo);
  if (keylen == 0)
    keylen = 32;
  key = malloc (keylen);
  if (!key)
    {
      fprintf (stderr, PGM ": couldn't allocate %d bytes\n", keylen);
      exit (1);
    }
  memset(key, 42, keylen);

  err = gcry_mac_open (&hd, mode->algo, 0, NULL);
  if (err)
    {
      fprintf (stderr, PGM ": error opening mac `%s'\n",
	       gcry_mac_algo_name (mode->algo));
      free (key);
      exit (1);
    }

  err = gcry_mac_setkey (hd, key, keylen);
  free (key);
  if (err)
    {
      fprintf (stderr, PGM ": error setting key for mac `%s'\n",
	       gcry_mac_algo_name (mode->algo));
      exit (1);
    }

  obj->priv = hd;

  return 0;
}

Example #2

File: hmac-gcrypt.c Project: Icenowy/qemu

QCryptoHmac *qcrypto_hmac_new(QCryptoHashAlgorithm alg,
                              const uint8_t *key, size_t nkey,
                              Error **errp)
{
    QCryptoHmac *hmac;
    QCryptoHmacGcrypt *ctx;
    gcry_error_t err;

    if (!qcrypto_hmac_supports(alg)) {
        error_setg(errp, "Unsupported hmac algorithm %s",
                   QCryptoHashAlgorithm_lookup[alg]);
        return NULL;
    }

    hmac = g_new0(QCryptoHmac, 1);
    hmac->alg = alg;

    ctx = g_new0(QCryptoHmacGcrypt, 1);

    err = gcry_mac_open(&ctx->handle, qcrypto_hmac_alg_map[alg],
                        GCRY_MAC_FLAG_SECURE, NULL);
    if (err != 0) {
        error_setg(errp, "Cannot initialize hmac: %s",
                   gcry_strerror(err));
        goto error;
    }

    err = gcry_mac_setkey(ctx->handle, (const void *)key, nkey);
    if (err != 0) {
        error_setg(errp, "Cannot set key: %s",
                   gcry_strerror(err));
        goto error;
    }

    hmac->opaque = ctx;
    return hmac;

error:
    g_free(ctx);
    g_free(hmac);
    return NULL;
}