Converting a Putty generated public key to OpenSSH

calendar2020-04-05 · 1 min read · ssh keys putty conversion  ·
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If you see a public key like below, chances are, it's generated using PuttyGen in Windows.

1---- BEGIN SSH2 PUBLIC KEY ----
2Comment: "rsa-key-20200101"
3AAAAB3NzaC1yc2EAAAABJQAAAQEArPVm4pY6eNaXFay32YHRdu96PXcwmhzGEWhK
4jmNRt2qWs39vbM/ZCQ7I8aKcgZJ6r35wInWpaqOH2xE0Jzx1rbC0aY+66KnPSFXZ
5WUkUK6oNFt55KbjgpGildiD4hehGHnRbNjoKWtKiOZKFVZPYn4H+oJ1qIUjfRzYn
6a9ArXR0gZ9Ev1tENXdbura3fin5qx8Ng6/NkWHseSiCRRW1vgS4ErSnQhei+8pJI
7l+GZnGhGgd4qDzHdoIt63yTuyPzqutgWhd3HoBahxCrcM9P+Gbo2J1as+8yYP56m
8jI5Jnuq5eFRGu7FDaRbxdvj7ZOXlZleAkY4YstE0kewzfnTW+Q==
9---- END SSH2 PUBLIC KEY ----

PuttyGen has a way to convert to OpenSSH but you can also convert it as follows:

1ssh-keygen -i -f keyfile.pub > newkeyfile.pub

More info in https://stackoverflow.com/questions/2224066/how-to-convert-ssh-keypairs-generated-using-puttygenwindows-into-key-pairs-use