id_rsa.pub

[Todd Denniston]

David Hláèik wrote, On 09/25/2008 07:35 AM:
> Hi guys, i have reinstalled my laptop with Fedora 9.
> 
> I have my RSA private key in .ssh/id_rsa . How to generate public key
> which i can use from private RSA key? (to have .ssh/id_rsa.pub).
> 
> Thanks!
> 
ssh-keygen -t rsa -b512 -C 'a test key' -N 'junkme'
mv id_rsa.pub id_rsa.pub.orig


ssh-keygen -f id_rsa -e >SECSHpkff
ssh-keygen -i -f SECSHpkff > SECSHpkff.ossh

cat id_rsa.pub.orig ;echo " ";cat SECSHpkff.ossh
ssh-rsa 
AAAAB3NzaC1yc2EAAAABIwAAAEEA2B/62aUjcZW4kZJRnL/mS0pNIuIt6BCVc6y2V24trV6H90qqud1Jy3mOT4ZuRru53LYtURENZPVXBPqzqYJ7QQ== 
a test key

ssh-rsa 
AAAAB3NzaC1yc2EAAAABIwAAAEEA2B/62aUjcZW4kZJRnL/mS0pNIuIt6BCVc6y2V24trV6H90qqud1Jy3mOT4ZuRru53LYtURENZPVXBPqzqYJ7QQ==


Visual diff indicates a delta in the comment portion, but otherwise the same.
...
So
ssh-keygen -f id_rsa -e >SECSHpkff
ssh-keygen -i -f SECSHpkff > id_rsa.pub
should get your public side back. There is probably an easier way, but this 
worked.

-- 
Todd Denniston
Crane Division, Naval Surface Warfare Center (NSWC Crane)
Harnessing the Power of Technology for the Warfighter