code: func (cap *CFSSL) CACertificate() ([]byte, error) {
  	req := &info.Req{
  		Label:   cap.Label,
  		Profile: cap.Profile,
  	}
  	out, err := json.Marshal(req)
  	if err != nil {
  		return nil, err
  	}
  
  	resp, err := cap.remote.Info(out)
  	if err != nil {
  		return nil, err
  	}
  
  	return []byte(resp.Certificate), nil
  }
docs: // CACertificate returns the certificate for a CFSSL CA.