DefaultKey: env.Get(EnvKMSDefaultKey, ""),
			conn: &kmsConn{
				enclave:    env.Get(EnvKMSEnclave, ""),
				defaultKey: env.Get(EnvKMSDefaultKey, ""),
				client:     client,
			},
			latencyBuckets: defaultLatencyBuckets,
			latency:        make([]atomic.Uint64, len(defaultLatencyBuckets)),
		}, nil
	case lookup(EnvKESEndpoint):
		rawEndpoint := env.Get(EnvKESEndpoint, "")
		if rawEndpoint == "" {