code: func (api *PublicWhisperAPI) DeleteKeyPair(ctx context.Context, key string) (bool, error) {
  	if ok := api.w.DeleteKeyPair(key); ok {
  		return true, nil
  	}
  	return false, fmt.Errorf("key pair %s not found", key)
  }
docs: // DeleteKeyPair removes the key with the given key if it exists.