C#实现16/32位MD5加密算法详解

 public class MD5
    {
        const int BITS_TO_A_BYTE = 8;
        const int BYTES_TO_A_WORD = 4;
        const int BITS_TO_A_WORD = 32;
        private static long[] m_lOnBits = new long[30 + 1];
        private static long[] m_l2Power = new long[30 + 1];

        private static long LShift(long lValue, long iShiftBits)
        {
            long LShift = 0;
            if (iShiftBits == 0)
            {
                LShift = lValue;
                return LShift;
            }
            else
            {
                if (iShiftBits == 31)
                {
                    if (Convert.ToBoolean(lValue & 1))
                    {
                        LShift = 0x80000000;
                    }
                    else
                    {
                        LShift = 0;
                    }
                    return LShift;
                }

                else
                {
                    if (iShiftBits < 0 || iShiftBits > 31)
                    {
                        // Err.Raise 6;
                    }
                }
            }

            if (Convert.ToBoolean((lValue & m_l2Power[31 - iShiftBits])))
            {
                LShift = ((lValue & m_lOnBits[31 - (iShiftBits + 1)]) * m_l2Power[iShiftBits]) | 0x80000000;
            }
            else
            {
                LShift = ((lValue & m_lOnBits[31 - iShiftBits]) * m_l2Power[iShiftBits]);
            }

            return LShift;
        }

        private static long RShift(long lValue, long iShiftBits)
        {
            long RShift = 0;
            if (iShiftBits == 0)
            {
                RShift = lValue;
                return RShift;
            }
            else