Feature request: Detached mode for Secret Key Encryption

[RimaitosLab]

Is it possible to add a Deteched mode to Secret Key Encryption like in libsodium.

At the moment I'm working with nfc tags and only hava limited storage (48 Bytes). And I need a way to verify the originallity of the chips content. That the data is encrypted isn't neccessary but also doesn't hurt.
The detached mode would allow me to save space, because I can create a unique nonce with the chips metadata.
And it should nither increase the code size by a lot nor should it be impossible complicated. So is it possible to add this feature to libhydrogen?

Thanks in Advance

• Rimaito