pub fn external_aad(bind: &Binding<'_>) -> Result<Vec<u8>, CratestackError>Expand description
Encode the external AAD for bind: the bytes that go into the
Sig_structure / MAC_structure as external_aad. Fails with
CratestackError::Internal (misuse) for an empty audience.
Public so other language bindings and the shared vectors can check their own encoding against this one.