What to Use Instead of PGP

some_furry wrote: post #5

rawandriddled wrote: post #4

How can I use the same ed25519 key pair for minisign and age?

You can't. Age is X25519, not Ed25519.

Edit: (Apologies). Thank you!

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

minisign secret key format:

  untrusted comment: minisign encrypted secret key
  RWRTY0IyNKMZZ+uqJdb8VtvSTo9EwylBlcsnitMtEyQzVLq/7tUAAAACAAAAAAAAAEAAAAAANLUi4xncsLbGKL+8y/n692Imrb9iURwzfnVfRqxqU5kAnVVrs98xMBqtIOiS63HZ3BQIGU6jpBWbX3ELCALfL/Le6UL3DunYfWqNPvhAKhlY4gQEjMzrL6ytxTFCXLGJpBSZHkK3DIQ=

[1] https://github.com/FiloSottile/age#user-content-ssh-keys

[2] https://www.unixtutorial.org/how-to-generate-ed25519-ssh-key...

[3] https://jedisct1.github.io/minisign/#secret-key-format

Re: What to Use Instead of PGP

#7

Post by some_furry » Sat, Nov 16, 2024, 6:48 AM UTC

rawandriddled wrote: post #6

some_furry wrote: post #5

Earlier quoted context omitted.

You can't. Age is X25519, not Ed25519.

Edit: (Apologies). Thank you! 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 minisign secret key format: untrusted comment: minisign encrypted secret key RWRTY0IyNKMZZ+uqJdb8VtvSTo9EwylBlcsnitMtEyQz…

It looks like age with SSH keys uses a birationally equivalent keypair.

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!