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sshsign is yet another simple tool to sign files and verify signatures with SSH keys

Installation

npm i -g sshsign

Usage examples

Private key info:

sshsign info -k ../.ssh/id_ed25519

Sign:

sshsign sign -k ~/.ssh/id_ed25519 -f test.txt

Verify:

sshsign verify -k ~/.ssh/id_ed25519.pub -f test.txt -s test.txt.sig

Signature file format (.sig)

The signature file format is quite simple

signature algorithm|base64 encoded signature

The list of signature algorithms is available here