Swiftsmoke/openwowcms — comment on commit a03201df6153aa42d5a6f9107f33459c62b4fa78
File: engine/core/trinity.php line 221
By Swiftsmoke:

All thats converted to uppercase is the returned sha1, the password is already changed to upper in the check on ln 271 (which I haven't changed)
function convertPass($username,$passwordraw)
{
return sha1(strtoupper($username.':'.$passwordraw));
}

On a demo site where I tested the code it was being returned as uppercase when being taken from the accounts database, so inorder for the login to work I needed to uppercase the check password