pub unsafe extern "system" fn SslExportKeyingMaterial(
    hsslprovider: NCRYPT_PROV_HANDLE,
    hmasterkey: NCRYPT_KEY_HANDLE,
    slabel: PCSTR,
    pbrandoms: *const u8,
    cbrandoms: u32,
    pbcontextvalue: *const u8,
    cbcontextvalue: u16,
    pboutput: *mut u8,
    cboutput: u32,
    dwflags: u32,
) -> HRESULT