leftt = leftt << 1 | leftt >>> 31 & 1;

        for (round = 0; round < 8; ++round) {
            work = right << 28 | right >>> 4;
            work ^= keys[keysi];
            keysi++;
            fval = SP7[work & 0x0000003f];
            fval |= SP5[work >>> 8 & 0x0000003f];
            fval |= SP3[work >>> 16 & 0x0000003f];
            fval |= SP1[work >>> 24 & 0x0000003f];
            work = right ^ keys[keysi++];