How can I use the same ed25519 key pair for minisign and age?
Even with "ssh-ed25519" [1]?
I looked at a ssh-ed25519 example [2] but i don't see how it can be extracted from the minisign secret key format [3], for example:
ssh-ed25519:
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIK0wmN/Cr3JXqmLW7u+g9pTh+wyqDHpSQEIQczXkVx9q gleb@reys.net
untrusted comment: minisign encrypted secret key
RWRTY0IyNKMZZ+uqJdb8VtvSTo9EwylBlcsnitMtEyQzVLq/7tUAAAACAAAAAAAAAEAAAAAANLUi4xncsLbGKL+8y/n692Imrb9iURwzfnVfRqxqU5kAnVVrs98xMBqtIOiS63HZ3BQIGU6jpBWbX3ELCALfL/Le6UL3DunYfWqNPvhAKhlY4gQEjMzrL6ytxTFCXLGJpBSZHkK3DIQ=
[2] https://www.unixtutorial.org/how-to-generate-ed25519-ssh-key...
https://github.com/FiloSottile/age/blob/176e245b3cb3ada322c2...
If you're using, for example, libsodium, you'd want the Ed25519 to X25519 functions to convert the two. (Note that you need to operate over raw bytes to do this.)
In practice, you shouldn't do this. Use different keys for different purposes!