pub unsafe extern "system" fn CryptMsgGetAndVerifySigner(
    hcryptmsg: *const c_void,
    csignerstore: u32,
    rghsignerstore: *const HCERTSTORE,
    dwflags: u32,
    ppsigner: *mut *mut CERT_CONTEXT,
    pdwsignerindex: *mut u32,
) -> BOOL