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If no output type is specified, the default is private. This option is not permitted for SSH-1 keys. Save an SSH-2 private key in ssh.com's format. This option is not permitted for SSH-1 keys.Īs private-openssh, except that it forces the use of OpenSSH's newer format even for RSA, DSA, and ECDSA keys. Save an SSH-2 private key in OpenSSH's format, using the oldest format available to maximise backward compatibility. All fingerprinting algorithms are believed compatible with OpenSSH. For SSH-2 keys, the public key will be output in the OpenSSHįormat, which is a single line (`ssh-rsa AAAAB3NzaC1yc2.'). For SSH-1 keys, this output format behaves identically to public. Save the public key only, in a format usable by OpenSSH. RFC 4716, which is a multi-line text file beginning with the line `- BEGIN SSH2 PUBLIC KEY -'. For SSH-2 keys, the public key will be output in the format specified by For SSH-1 keys, the standard public key format will be used (`1024 37 5698745.'). This will either be the standard SSH-1 key format, or PuTTY's own SSH-2 key format. Save the private key in a format usable by PuTTY. Specify the type of output you want puttygen to produce. I was using a key generated by AWS on Manjaro which is a bit more bleeding edge than most other distros, still worked but the warning message was annoying.įor more info you can use man puttygen but the relevent section is below: -O output-type For anyone who has tried sudo puttygen ~/.ssh/your-key.pem -O private-openssh -o ~/.ssh/your-key-new.pem and got an error message saying puttygen: this command would perform no useful action there is an even newer format so you need to amend the command as follows: sudo puttygen ~/.ssh/your-key.pem -O private-openssh-new -o ~/.ssh/your-key-new.pem