ssh-to-age

Convert SSH Ed25519 keys to age keys. This is useful for usage in sops-nix and sops

Usage

• Exports the private key:

$ ssh-to-age -private-key -i $HOME/.ssh/id_ed25519 -o key.txt
$ cat key.txt
 AGE-SECRET-KEY-1K3VN4N03PTHJWSJSCCMQCN33RY5FSKQPJ4KRRTG3JMQUYE0TUSEQEDH6V8

If you private key is encrypted, you can export the password in SSH_TO_AGE_PASSPHRASE

$ read -s SSH_TO_AGE_PASSPHRASE; export SSH_TO_AGE_PASSPHRASE
$ ssh-to-age -private-key -i $HOME/.ssh/id_ed25519 -o key.txt

• Exports the public key:

$ ssh-to-age -i $HOME/.ssh/id_ed25519.pub -o pub-key.txt
$ cat pub-key.txt
age17044m9wgakla6pzftf4srtl3h5mcsr85jysgt5fg23zpnta8sfdqhzn452

ssh-to-age also supports multiple public keys at once seperated by newlines and ignores unless ssh keys that are not in the ed25519 format. This makes it suiteable in combination with ssh-keyscan:

$ ssh-keyscan eve.thalheim.io eva.thalheim.io | ssh-to-age
# eve.thalheim.io:22 SSH-2.0-OpenSSH_8.6
...
age1hjm3aujg9e79f5yth8a2cejzdjg5n9vnu96l05p70uvfpeltnpms7yy3pp
age1v8zjc47jmlqwefyu66s0d4ke98qr4vnuj3cpvs4z9npfdw833dxqwjrhzv

Install with nix

$ nix-shell -p 'import (fetchTarball "https://github.com/Mic92/ssh-to-age/archive/main.tar.gz") {}'

Install with go

$ go install github.com/Mic92/ssh-to-age/cmd/ssh-to-age@latest