COOKIE_INPUT_SIZE
uint8_t shared[COOKIE_INPUT_SIZE];
karc4random_buf(shared, COOKIE_INPUT_SIZE);
const uint8_t[COOKIE_INPUT_SIZE],
const uint8_t key[COOKIE_INPUT_SIZE])
cookie_maker_alloc(const uint8_t key[COOKIE_INPUT_SIZE])
const uint8_t input[COOKIE_INPUT_SIZE],
blake2s_update(&blake, input, COOKIE_INPUT_SIZE);
const uint8_t[COOKIE_INPUT_SIZE]);
cookie_maker_alloc(const uint8_t[COOKIE_INPUT_SIZE]);