YUBIKEY_KEY_SIZE
char hexkey[33], key[YUBIKEY_KEY_SIZE];
yubikey_hex_decode(key, hexkey, YUBIKEY_KEY_SIZE);
yubikey_parse(const uint8_t *password, const uint8_t key[YUBIKEY_KEY_SIZE],
const uint8_t key[YUBIKEY_KEY_SIZE], yubikey_token_t out, int index);