[Dovecot] SIS Implementation

[Daniel L. Miller]

Timo Sirainen wrote:
> Step 4) Figure out if base64-encoded attachments can be decoded in a way
> that allows re-encoding them back to the exact original encoding. If so,
> save the attachment decoded and add the necessary encoding info the dbox
> metadata.
>
> Or perhaps just store them compressed. How much of a difference is there
> between storing decoded data vs. compressed base64 encoded data?
>
>   
Do we need a new parameter in dovecot.conf?  "SIS_Location"?

Why is the base64 sum needed of the SHA256?  Isn't the SHA256 unique enough?

If the attachments are already compressed via zip or some such, would 
further encoding just add processing time without any storage benefit?
-- 
Daniel