Add OFB to the API.
Add OFB to the API.

svn path=/trunk/kdesupport/qca/; revision=400924

karolherbst/qca,oktavarium/qca,Bjoe/qca,karolherbst/qca,Bjoe/qca,KDE/qca,KDE/qca,sladage/qca,sladage/qca,sladage/qca,highfidelity/qca,highfidelity/qca,JoshuaKolden/qca,Bjoe/qca,JoshuaKolden/qca,JoshuaKolden/qca,oktavarium/qca,highfidelity/qca,oktavarium/qca,KDE/qca,Bjoe/qca,JoshuaKolden/qca,Esf-Software/qca,highfidelity/qca,karolherbst/qca,KDE/qca,Esf-Software/qca,oktavarium/qca,karolherbst/qca,Esf-Software/qca,Esf-Software/qca,sladage/qca