matrix_expand_A
if (!matrix_expand_A(md_ctx, key->shake128_md, key->rho, &a_ntt))
if (!matrix_expand_A(md_ctx, priv->shake128_md, priv->rho, &a_ntt))
|| !matrix_expand_A(md_ctx, pub->shake128_md, pub->rho, &a_ntt))