- Draft-Cavage signing and verification (RSA-SHA256)
- Draft-Cavage interop workarounds for Mastodon, Pleroma, and PeerTube
- RFC 9421 signing and verification
- RFC 9421 algorithms: rsa-pss-sha512, rsa-v1_5-sha256, hmac-sha256, ecdsa-p256-sha256, ecdsa-p384-sha384, ed25519
- RFC 9421 derived components: @method, @target-uri, @authority, @scheme, @request-target, @path, @query, @query-param, @status
- RFC 9421 multiple signature support
- Signature-Input parsing via starry (RFC 8941 Structured Fields)
- Key helpers: generate and parse RSA and Ed25519 keys
- Rack middleware for automatic signature verification
- HTTP.rb signing client for automatic request signing