pub unsafe extern "C" fn ENGINE_load_ssl_client_cert(
e: *mut engine_st,
s: *mut ssl_st,
ca_dn: *mut stack_st_X509_NAME,
pcert: *mut *mut x509_st,
ppkey: *mut *mut evp_pkey_st,
pother: *mut *mut stack_st_X509,
ui_method: *mut ui_method_st,
callback_data: *mut c_void,
) -> i32