fatal func(msg string)
}

func (n *nonceGenerator) next(b []byte) {
	incrementingNonce := n.nonce.Add(1)
	if incrementingNonce <= n.zero {
		// this should never happen, and is unrecoverable if it does
		n.fatal("aes-gcm detected nonce overflow - cryptographic wear out has occurred")
	}
	binary.LittleEndian.PutUint64(b, incrementingNonce)
}

func die(msg string) {