KMAC_MAX_ENCODED_HEADER_LEN
unsigned char encoded_outlen[KMAC_MAX_ENCODED_HEADER_LEN];
unsigned char tmp[KMAC_MAX_KEY + KMAC_MAX_ENCODED_HEADER_LEN];
#define KMAC_MAX_CUSTOM_ENCODED (KMAC_MAX_CUSTOM + KMAC_MAX_ENCODED_HEADER_LEN)