bad

useful for git hosts like https://codeberg.org

on plan9:

; auth/secstore -G factotum | grep rsa | auth/rsa2asn1 -a >key.der
# You likely already have this under $home/lib/sshkey.pub
; auth/secstore -G factotum | grep rsa | auth/rsa2ssh >key.pub

get those files on your unix machine.

on unix:

$ openssl rsa -inform DER -in key.der -outform PEM -out key
$ ssh-keygen -p -f key -N ''
$ echo 'whatever' | ssh-keygen -Y sign -n namespace -f key