Thanks for your work. Appreciated.
Botan seems to be a bit tricky in cross-compiling scenarios. What I needed it for was basically only AES128-CBC and SHA256. Pretty basic stuff. It could also be implemented differently so we could get rid of Botan.
For AES tiny AES. And for SHA SHA256. For example.
Somebody voluntary to create a pull request? Or alternative suggestions? Personally I don't feel too much pain to do something because it is working fine