const calculateTempValuesforSecretKey = (listSorted, participantJid, uid, callback) => {
    getPreviousNext(listSorted, participantJid, (current, previous, next) => {
      if (!_.has(next, 'd')) {
        return cryptoHelpers.xorBuffers([generateBuffer(current.d), generateBuffer(next.z)], (value) => {
          next.d = value;
          calculateTempValuesforSecretKey(listSorted, next.jid, uid, callback);
        });
      }
      const buffers = _.map(listSorted, participant => participant.d);
      buffers.push(generateBuffer(uid));
      _.each(buffers, buffer => buffer.toString('hex'));
      return callback(cryptoHelpers.hashBufferList(buffers));
    });
  };