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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 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.