var X = this._X = [
                    K[0], (K[3] << 16) | (K[2] >>> 16),
                    K[1], (K[0] << 16) | (K[3] >>> 16),
                    K[2], (K[1] << 16) | (K[0] >>> 16),
                    K[3], (K[2] << 16) | (K[1] >>> 16)