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This allows you to actually use an OpenSSH user certificate for authentication, by combining the PPK you already had with the certificate from the CA to produce a new PPK whose public half contains the certificate. I don't intend that this should be the only way to do it. It's cumbersome to have to use the key passphrase in order to re-encrypt the modified PPK. But the flip side is that once you've done it you have everything you need in one convenient file, and also, the certificate itself is covered by the PPK's tamperproofing (in case you can think of any attacks in which the admin of your file server swaps out just the certificate for a different one on the same key). So this is *a* useful way to do it, even if not the only useful way. The new options to add and remove certificates are supported by both Windows GUI PuTTYgen and cmdgen. cmdgen can also operate on pure public keys, so you can say 'puttygen --remove-certificate foo-cert.pub' and get back the underlying foo.pub; Windows PuTTYgen doesn't support that mode, but only because it doesn't in general have any support for the loaded key not being a full public+private pair.
This is the README for PuTTY, a free Windows and Unix Telnet and SSH
client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), run these commands in
the source directory:
cmake .
cmake --build .
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory using `doc/Makefile'. If you aren't using one of our
source snapshots, you'll need to do this yourself. Halibut can be
found at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.