code: func (ks *KeyStore) GenerateSymmetricKey(topic Topic, address PssAddress, addToCache bool) (string, error) {
  	keyid, err := ks.w.GenerateSymKey()
  	if err == nil {
  		ks.addSymmetricKeyToPool(keyid, topic, address, addToCache, false)
  	}
  	return keyid, err
  }
docs: // Automatically generate a new symkey for a topic and address hint