add encryption options

[dagrha]

Default now is SHA-1 hashing and AES-128 cipher. 128 bit AES is probably enough but it would be nice to have the option of 256.

[dagrha]

With most recent PR I've made some changes that will allow this in the future. The Keyfile class can take cipher and auth as kwargs but there's still no way for the user to change this with a command line argument. Won't be much longer before SHA2 and AES-256 are options.

[d4rkcat]

For a dirty hack you can just download the relevant ovpn files or even edit the ones already downloaded:

https://www.privateinternetaccess.com/openvpn/openvpn.zip https://www.privateinternetaccess.com/openvpn/openvpn-strong.zip https://www.privateinternetaccess.com/openvpn/openvpn-ip.zip https://www.privateinternetaccess.com/openvpn/openvpn-tcp.zip https://www.privateinternetaccess.com/openvpn/openvpn-strong-tcp.zip

[dagrha]

Thanks for those links, d4rkcat!