COOKIE_KEY_LABEL_LEN
static const u8 mac1_key_label[COOKIE_KEY_LABEL_LEN] __nonstring = "mac1----";
static const u8 cookie_key_label[COOKIE_KEY_LABEL_LEN] __nonstring = "cookie--";
const u8 label[COOKIE_KEY_LABEL_LEN])
blake2s_update(&blake, label, COOKIE_KEY_LABEL_LEN);