pkg/

Package cryptoutil provides symmetric encryption for per-user secrets at rest: AES-256-GCM with a 96-bit random nonce, ciphertext and nonce returned as separate byte slices, 32-byte keys decoded from base64.

Package duration provides helpers for converting between flight time representations.

Package registration normalises aircraft registrations to the canonical notation of their state of registry, looked up in the nationality mark table in prefixes.go.

Package solar provides a thin wrapper around github.com/mstephenholl/go-solar for computing sunrise/sunset and determining whether a given UTC instant is during daytime or nighttime.