squid-3.4.5 release adds support for nettle and is using it by default, openssl is disabled by default: /usr/sbin/squid now links to libnettle.so.4.
Seems now nettle is only used for replacing lib/md5.c
+*squid-3.4.6 (01 Jul 2014) + + 01 Jul 2014; Eray Aslan <eras@gentoo.org> +squid-3.4.6.ebuild: + Version bump - bug #515896. Fix dev-libs/nettle automagic dependency - bug + #511580 +