PEM_read_bio_X509_AUX
x = PEM_read_bio_X509_AUX(cert, NULL, password_callback, NULL);
x = PEM_read_bio_X509_AUX(cert, NULL, NULL, NULL);
x = PEM_read_bio_X509_AUX(in, NULL, NULL, "");
if ((x = PEM_read_bio_X509_AUX(in, NULL, passwd_cb, passwd_arg)) ==