Function libssh_rs_sys::ssh_pki_export_privkey_base64

pub unsafe extern "C" fn ssh_pki_export_privkey_base64(
    privkey: ssh_key,
    passphrase: *const c_char,
    auth_fn: ssh_auth_callback,
    auth_data: *mut c_void,
    b64_key: *mut *mut c_char
) -> c_int