[patch] ssh-keygen(1): generate Ed25519 keys when invoked without arguments

[Stuart Henderson]

On 2023/09/03 22:13, Job Snijders wrote:
> Dear all,
> 
> Ed25519 public keys being as small as they are is very convenient.
> There is an opportunity to nudge the world towards modern algorithms.
> I believe choices made in OpenSSH can positively impact the wider
> eco-system and industry. I'd like to suggest ssh-keygen to generate an
> Ed25519 keypair, if invoked without any arguments.
> 
> OpenSSH has supported Ed25519 since version 6.5 (January 2014).
> The newly published FIPS 186-5 (February 2023) guidelines approve
> the EdDSA algorithms specified in IETF RFC 8032 (January 2017).

amazingly, even Mikrotik finally added support (August 2023)...

> At p2k23 Theo de Raadt suggested now (before OpenBSD 7.4 release) is
> good timing to consider this change. Is there a reason not to do this?
> 
> OK?

Seems a sane default to me. People can always use -t rsa if needed.