Check for the existence and length of RSA Keys

Unanswered Question


I have a network with several hundred routers and I need to lock all my devices down to use SSHv2 only.

I have tools which will allow me to interact with the IOS CLI in a scripted fashion but I just need to know, are there commands I can use to easily check for the existence of and length of RSA keys which may already have been generated on my routers?



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Thank you very much, Jon for your reply.

I am aware of the command you referenced and I imagine there is a way to calculate the key length from the displayed key data (e.g. the number of characters displayed will tell you whether the key was generated with a modulus of 512, 768, 1024, etc).

However, I am hoping there is a more succinct way to check for the existence and length (modulus) of all existing keys on a router (something more like a "summary" view or maybe even a MIB variable).

TIA again for any additional recommendations!



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