FromContext returns the Session value stored in a Context, if any.

GenerateKeyToken generates an encrypted protobuf API key token in raw (no padding) base64 format.

GeneratePageToken generates a page token in raw (no padding), URL-safe base64 format.

GenerateWebToken generates an encrypted protobuf web token in raw (no padding) base64 format.

NewContext returns a new Context that carries a Session.

ParsePageToken parses a page token in raw (no padding), URL-safe base64 format, or an empty string.

ValidateWebToken validates an encrypted protobuf web or API key token.

WebTokenExp represents the lifetime of a web token in seconds.

Session represents session metadata as retrieved from an encrypted token.