pub unsafe extern "C" fn CMSDecoderCopySignerCert(
decoder: CMSDecoderRef,
signer_index: usize,
signer_cert_out: *mut SecCertificateRef,
) -> OSStatus
pub unsafe extern "C" fn CMSDecoderCopySignerCert(
decoder: CMSDecoderRef,
signer_index: usize,
signer_cert_out: *mut SecCertificateRef,
) -> OSStatus