as discussed with Justin.
It basically made sense to have a default of SHA1 for HMAC, but
when we went away from having all the specific classes, defaulting
all MAC to be HMAC(SHA1) was a bit of a stretch.
svn path=/trunk/kdesupport/qca/; revision=605322
Essentially if you had previously used a subclass
of Cipher, Hash or MAC, then you need to change
your code. The change is pretty simple - you
just pass a string name as the first argument.
svn path=/trunk/kdesupport/qca/; revision=576204
