hi
you need to have triple des support in ur ios code to configure SSH in ur router..
Thats to generate the pubkic key..
would suggest to cehck this link for getting the exact ios code for ur box with the current h/w information installed in them
http://tools.cisco.com/Support/Fusion/FusionHome.do
Note : you need to have valid cco with reqd privileges to access this tool..
regds