point_resize (mpi_point_t p, mpi_ec_t ctx)
{
  /*
   * For now, we allocate enough limbs for our EC computation of ec_*.
   * Once we will improve ec_* to be constant size (and constant
   * time), NLIMBS can be ctx->p->nlimbs.
   */
  size_t nlimbs = 2*ctx->p->nlimbs+1;

  mpi_resize (p->x, nlimbs);
  if (ctx->model != MPI_EC_MONTGOMERY)
    mpi_resize (p->y, nlimbs);
  mpi_resize (p->z, nlimbs);
}

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