Wii files now public on Redump
Dolphin emulator just now implements hash-checking dumps in Dolphin itself.
Apparently the wii database has been made public, too? Although i cannot fully find the exact information.
There is this Dolphin Pull Request, which implements the feature: https://github.com/dolphin-emu/dolphin/pull/8330
And there is a link to the forum on redump where it has been discussed: http://forum.redump.org/topic/21708/redump-integration-in-dolphin/
"It currently doesn't work, but the code is written so that it automatically will start working once the datfile becomes public. Thankfully, having a datfile for Wii games is less important than for GameCube games since Wii games have a lot of verification data built in."
http://redump.org/datfile/gc is the only public DATfile of the two, right now.
It performs this through an API that they've developed.
The code seems to just DL the DATfile - while Wii is still private, the GCN datfile could be DLed from Redump directly
This thread is old, but there is an update to this situation. I recently checked their website again, and the wii file is now public.
http://redump.org/downloads/
Right now cleanrip downloads files using gc-forever-- There is old code that downloaded them directly from redump, though.