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Re:What to Use Instead of PGP by rawandriddled on Friday November 15, 2024 @04:21PM (#42151239)
How can I use the same ed25519 key pair for minisign and age?
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Re:What to Use Instead of PGP by some_furry on Friday November 15, 2024 @05:47PM (#42152147)
You can't. Age is X25519, not Ed25519.
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Re:What to Use Instead of PGP by rawandriddled on Friday November 15, 2024 @06:42PM (#42152601)
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 [email protected]
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

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Re:What to Use Instead of PGP by some_furry on Saturday November 16, 2024 @01:48AM (#42154899)
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!

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