Factorization for reuse AES mode

[Brissouille]

If the code is factorizable in reusing the init of the variables, then we implement only the functions of chainning (= xor plain with iv) and call them in function of mode chosen.

[Brissouille]

Factorization is in progress. All the variables subject to the initialization of the AES mode are in the function init_mode.
Questions:
Do I build a dictionary with different functions init_mode for each AES mode ?
Do I build a class AES_.... for each mode and give a mother abstract class AES_Mode. Only one function must be implemented (ie init_mode).

[Brissouille]

I choose to build a class AES_mode where each Aes mode (example cbc) will be a daughter class. Then I implement the function init_mode for each mode.
Aes_mode class will be an abstract class.