COOKIE_ENCRYPTED_SIZE
uint8_t ec[COOKIE_ENCRYPTED_SIZE];
uint8_t cookie[COOKIE_ENCRYPTED_SIZE];
uint8_t ecookie[COOKIE_ENCRYPTED_SIZE],
const uint8_t ecookie[COOKIE_ENCRYPTED_SIZE])
if (!xchacha20poly1305_decrypt(cookie, ecookie, COOKIE_ENCRYPTED_SIZE,
uint8_t[COOKIE_ENCRYPTED_SIZE],
const uint8_t[COOKIE_ENCRYPTED_SIZE]);