code: function EncackPacket(publicKey) {
    if (!(this instanceof EncackPacket))
      return new EncackPacket(publicKey);
  
    Packet.call(this);
  
    this.publicKey = publicKey || encoding.ZERO_KEY;
  }
docs: Represents a `encack` packet.
  @constructor
  @param {Buffer?} publicKey
  @property {Buffer} publicKey