// randomized for backwards compatibility but is not in use.
var deprecatedSessionTicketKey = []byte("DEPRECATED")

// initLegacySessionTicketKeyRLocked ensures the legacy SessionTicketKey field is
// randomized if empty, and that sessionTicketKeys is populated from it otherwise.
func (c *Config) initLegacySessionTicketKeyRLocked() {
	// Don't write if SessionTicketKey is already defined as our deprecated string,