If I’m not mistaken, Solaris 11 is shipped with Perl installed (5.8.4 and 5.12). You can try Crypt::LE, which has been tested on multiple platforms (Linux, FreeBSD, NetBSD, OpenBSD, Windows (Cygwin), etc.) with Perl versions from 5.8.9 and up installed. I would imagine it should work on Solaris box just as fine.