int crypto_unpwbox(uint8_t **out, size_t *outlen_out, const uint8_t *inp, size_t input_len, const char *secret, size_t secret_len)
int crypto_pwbox(uint8_t **out, size_t *outlen_out, const uint8_t *inp, size_t input_len, const char *secret, size_t secret_len, unsigned s2k_flags)