code: public KeyStoreCredentialResolverBuilder addKeyPassword(String name, String password) {
          requireNonNull(name, "name");
          requireNonNull(password, "password");
          checkArgument(!keyPasswords.containsKey(name), "key already exists: %s", name);
          keyPasswords.put(name, password);
          return this;
      }
docs: Adds a key name and its password to the {@link KeyStoreCredentialResolverBuilder}.