I think it's time; RFC 8709 has been a thing for a couple of years
now and a bit of gentle pressure is good.
ok djm, but cc openssh@ so others can chime in
-d
On Sun, 6 Nov 2022, Job Snijders wrote:
> Dear all,
>
> Support for using Ed25519 for server and user authentication was
> introduced in 2014. I like the compactness of Ed25519 public keys.
>
> Perhaps now is a good time to make Ed25519 the default key type when
> invoking ssh-keygen(1) without arguments?
>
> Kind regards,
>
> Job
>
> Index: ssh-keygen.1
> ===================================================================
> RCS file: /cvs/src/usr.bin/ssh/ssh-keygen.1,v
> retrieving revision 1.226
> diff -u -p -r1.226 ssh-keygen.1
> --- ssh-keygen.1 10 Sep 2022 08:50:53 -0000 1.226
> +++ ssh-keygen.1 6 Nov 2022 13:31:19 -0000
> @@ -185,7 +185,7 @@ The type of key to be generated is speci
> option.
> If invoked without any arguments,
> .Nm
> -will generate an RSA key.
> +will generate an ed25519 key.
> .Pp
> .Nm
> is also used to generate groups for use in Diffie-Hellman group
> Index: ssh-keygen.c
> ===================================================================
> RCS file: /cvs/src/usr.bin/ssh/ssh-keygen.c,v
> retrieving revision 1.459
> diff -u -p -r1.459 ssh-keygen.c
> --- ssh-keygen.c 11 Aug 2022 01:56:51 -0000 1.459
> +++ ssh-keygen.c 6 Nov 2022 13:31:21 -0000
> @@ -61,12 +61,6 @@
> #include "ssh-pkcs11.h"
> #endif
>
> -#ifdef WITH_OPENSSL
> -# define DEFAULT_KEY_TYPE_NAME "rsa"
> -#else
> -# define DEFAULT_KEY_TYPE_NAME "ed25519"
> -#endif
> -
> /*
> * Default number of bits in the RSA, DSA and ECDSA keys. These value can be
> * overridden on the command line.
> @@ -252,7 +246,7 @@ ask_filename(struct passwd *pw, const ch
> char *name = NULL;
>
> if (key_type_name == NULL)
> - name = _PATH_SSH_CLIENT_ID_RSA;
> + name = _PATH_SSH_CLIENT_ID_ED25519;
> else {
> switch (sshkey_type_from_name(key_type_name)) {
> case KEY_DSA_CERT:
> @@ -3748,7 +3742,7 @@ main(int argc, char **argv)
> }
>
> if (key_type_name == NULL)
> - key_type_name = DEFAULT_KEY_TYPE_NAME;
> + key_type_name = "ed25519";
>
> type = sshkey_type_from_name(key_type_name);
> type_bits_valid(type, key_type_name, &bits);
>
>
