Use existing auth library or write my own?

[eluser]rogierb[/eluser]
Only if you have experience with security, you could build your own.

I would go with an existing one. When using standard ci database session, you can add user data like s_char_id.
That only leaves the login part for the character and you can rip/copy/extend from the existing library.

It seems the fastest and more secure way.