password_callback
pem_cb = password_callback;
x = PEM_read_bio_X509_AUX(cert, NULL, password_callback, NULL);
pkey = PEM_read_bio_PrivateKey(key, NULL, password_callback, &cb_data);
if (!load_pkcs12(err, key, key_descrip, password_callback, &cb_data,
pkey = b2i_PVK_bio(key, password_callback,
rsa = PEM_read_bio_RSAPublicKey(key, NULL, password_callback, &cb_data);
pkey = PEM_read_bio_PUBKEY(key, NULL, password_callback, &cb_data);
xis = PEM_X509_INFO_read_bio(bio, NULL, password_callback, &cb_data);
int password_callback(char *buf, int bufsiz, int verify, void *cb_data);
NULL, 0, password_callback, &cb_data))