ssl_password_cb
ssl_password_cb, NULL)) == NULL) {
ssl_password_cb, NULL)) == NULL) {
int ssl_password_cb(char *, int, int, void *);
key = PEM_read_PrivateKey(fp, NULL, ssl_password_cb, pass);
key = PEM_read_PrivateKey(fp, NULL, ssl_password_cb, prompt);