src/main/java/com/aliyun/oss/common/utils/CRC64.java [251:272]:
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        do {
            // apply zeros operator for this bit of len2
            gf2MatrixSquare(even, odd);
            if ((len2 & 1) == 1)
                crc1 = gf2MatrixTimes(even, crc1);
            len2 >>>= 1;

            // if no more bits set, then done
            if (len2 == 0)
                break;

            // another iteration of the loop with odd and even swapped
            gf2MatrixSquare(odd, even);
            if ((len2 & 1) == 1)
                crc1 = gf2MatrixTimes(odd, crc1);
            len2 >>>= 1;

            // if no more bits set, then done
        } while (len2 != 0);

        // return combined crc.
        crc1 ^= crc2;
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src/main/java/com/aliyun/oss/common/utils/CRC64.java [315:336]:
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        do {
            // apply zeros operator for this bit of len2
            gf2MatrixSquare(even, odd);
            if ((len2 & 1) == 1)
                crc1 = gf2MatrixTimes(even, crc1);
            len2 >>>= 1;

            // if no more bits set, then done
            if (len2 == 0)
                break;

            // another iteration of the loop with odd and even swapped
            gf2MatrixSquare(odd, even);
            if ((len2 & 1) == 1)
                crc1 = gf2MatrixTimes(odd, crc1);
            len2 >>>= 1;

            // if no more bits set, then done
        } while (len2 != 0);

        // return combined crc.
        crc1 ^= crc2;
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