public WZTool(int mapleVersion) {
	this.mapleVersion = mapleVersion;
	this.ivKey =  new byte[] { 0x4D, 0x23, (byte) 0xC7, 0x2B };
	initKeys();
    }

    public WZTool(int mapleVersion, byte[] ivKey) {
	this.mapleVersion = mapleVersion;
	this.ivKey = ivKey;
	initKeys();
    }