COOKIE_ENCRYPTED_SIZE
uint8_t ec[COOKIE_ENCRYPTED_SIZE];
uint8_t ecookie[COOKIE_ENCRYPTED_SIZE], struct sockaddr *sa)
uint8_t nonce[COOKIE_NONCE_SIZE], uint8_t ecookie[COOKIE_ENCRYPTED_SIZE])
if (!xchacha20poly1305_decrypt(cookie, ecookie, COOKIE_ENCRYPTED_SIZE,
uint8_t [COOKIE_ENCRYPTED_SIZE], struct sockaddr *);
uint8_t[COOKIE_NONCE_SIZE], uint8_t[COOKIE_ENCRYPTED_SIZE]);