pub unsafe extern "C" fn nettle_rsa_pss_sha256_sign_digest_tr(
    pub_: *const rsa_public_key,
    key: *const rsa_private_key,
    random_ctx: *mut c_void,
    random: nettle_random_func,
    salt_length: usize,
    salt: *const u8,
    digest: *const u8,
    s: *mut __mpz_struct
) -> c_int