key, err := mtls.ParsePrivateKey(env.Get(EnvKMSAPIKey, ""))
		if err != nil {
			return nil, err
		}

		var rootCAs *x509.CertPool
		if opts != nil && opts.CADir != "" {
			rootCAs, err = certs.GetRootCAs(opts.CADir)
			if err != nil {
				return nil, err
			}
		}

		client, err := kms.NewClient(&kms.Config{
			Endpoints: endpoints,
			APIKey:    key,
			TLS: &tls.Config{