[lug] Windows/PuTTY and Linux SSH Key Pair Compatibility

[D. Stimits]

I'm trying to find out what is possible for copying a Windows-generated RSA public key (puttygen) to a Linux server. I do not have physical access, and I have my own key set up since I personally only use Linux to log in, but need to add a login for another user...and that user is using Windows. The trouble is that the public key is not what I expected...it is multi-line, it contains other comment, so on. It looks more like an email PGP key, but ignoring actual body content, this is the format:

---- BEGIN SSH2 PUBLIC KEY ----
Comment: "rsa-key-20181228"
ABC...cut...TEn
DEF...cut...HHN
ghi...cut...W2L
JkL...cut...YYB
XYZ...cut...srW
Foo...cut...Bar
---- END SSH2 PUBLIC KEY ----


So far as I know, the Linux style ".ssh/authorized_keys" would use a single line, and I am guesing that simply concatenating that content like an OpenSSH style single key might break it. I could have other ssh logins ready before doing this, so it isn't 100% that breaking this would lock me out, but I'd rather hear from someone who has done this before what the correct way is.


Or, if there are comments on whether alternates to PuTTY (e.g., WinSCP) have worked out when a Windows user needs to occasionally copy a file to a Linux server (mostly just PDF files to a document directory). My goal is to have the Windows user with a single ssh key and keyless login.


Thanks!

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