Allow user to choose cryptographic algorithms

[Vinalti]

Feature description

Allow user to change currently default algorithms for certificates such as the hash sha256, key type aes256, etc.

Implementation

Different type of implementation can be put in place:

• The addition of one or several options such as --key-type=[rsa|ec] or --rsa / --ec and --hash=[sha256|...]
• The addition of a prompt during the generation of the private key