Created attachment 3274 [details]
patch against current CVS version

ssh-keygen -l -f keyfile prints the fingerprint of a public key. Combining the -l switch with -v additionally prints the key's "ASCII art" representation, which is visually easier to compare in case the key's fingerprint needs to be verified manually.

ssh-keygen -F host can be used to search the known_hosts file for a host's key and adding -l prints the key's fingerprint. But combining the -l switch with -v to get the ASCII art representation does not work in this context; the source code makes no attempt to generate or print the ASCII art fingerprint of the knonw_hosts key. This seems to be a bug.

Attached is a patch that should fix this (I just copied the ASCII art printing code from fingerprint_one_key() function used by do_fingerpint(), and added a missing NULL check that was present there.)