This should connect you. If you're not using wpa_supplicant, you'll need to migrate from Wireless Tools to it in order to use WPA. Refer to the [http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=4&chap=4#doc_chap2 Gentoo documentation] for a step-by-step guide to setting up WPA Supplicant.