pub unsafe extern "C" fn RSA_verify_pss_mgf1(
    rsa: *mut RSA,
    digest: *const u8,
    digest_len: usize,
    md: *const EVP_MD,
    mgf1_md: *const EVP_MD,
    salt_len: c_int,
    sig: *const u8,
    sig_len: usize
) -> c_int