ec_priv_key_export_to_buf
ATTRIBUTE_WARN_UNUSED_RET int ec_priv_key_export_to_buf(const ec_priv_key *priv_key, u8 *priv_key_buf,
ret = ec_priv_key_export_to_buf(priv_key, priv_key_buf + metadata_len,
ret = ec_priv_key_export_to_buf(in_priv, x_buf, (hash->digest_size / 2)); EG(ret, err);