internal override void ProcessBlock()

in signature/csharp/core/SM3Digest.cs [309:393]
67 lines of code
6 McCabe index (conditional complexity)

        internal override void ProcessBlock()
        {
            int j;

            int[] ww = X;
            //64位比特串
            int[] ww_ = new int[64];

            #region 块消息扩展
            //消息扩展16 TO 67
            for (j = 16; j < 68; j++)
            {
                ww[j] = P1(ww[j - 16] ^ ww[j - 9] ^ (Rotate(ww[j - 3], 15))) ^ (Rotate(ww[j - 13], 7)) ^ ww[j - 6];
            }
            //消息扩展0 TO 63
            for (j = 0; j < 64; j++)
            {
                ww_[j] = ww[j] ^ ww[j + 4];
            }
            #endregion

            #region 压缩函数
            int[] vv = v;
            int[] vv_ = v_;//A,B,C,D,E,F,G,H为字寄存器

            Array.Copy(vv, 0, vv_, 0, IV.Length);
            //中间变量SS1,SS2,TT1,TT2
            int SS1, SS2, TT1, TT2;
            int aaa;
            //将消息分组B(i)划分为16个字
            for (j = 0; j < 16; j++)
            {
                aaa = Rotate(vv_[0], 12);
                SS1 = aaa + vv_[4] + Rotate(TOne, j);
                SS1 = Rotate(SS1, 7);
                SS2 = SS1 ^ aaa;

                TT1 = FFOne(vv_[0], vv_[1], vv_[2]) + vv_[3] + SS2 + ww_[j];
                TT2 = GGOne(vv_[4], vv_[5], vv_[6]) + vv_[7] + SS1 + ww[j];

                #region 更新各个寄存器
                vv_[3] = vv_[2];
                vv_[2] = Rotate(vv_[1], 9);
                vv_[1] = vv_[0];
                vv_[0] = TT1;
                vv_[7] = vv_[6];
                vv_[6] = Rotate(vv_[5], 19);
                vv_[5] = vv_[4];
                vv_[4] = P0(TT2);
                #endregion
            }

            for (j = 16; j < 64; j++)
            {
                aaa = Rotate(vv_[0], 12);
                SS1 = aaa + vv_[4] + Rotate(TSecond, j);
                SS1 = Rotate(SS1, 7);
                SS2 = SS1 ^ aaa;

                TT1 = FFSecond(vv_[0], vv_[1], vv_[2]) + vv_[3] + SS2 + ww_[j];
                TT2 = GGSecond(vv_[4], vv_[5], vv_[6]) + vv_[7] + SS1 + ww[j];

                #region 更新各个寄存器
                vv_[3] = vv_[2];
                vv_[2] = Rotate(vv_[1], 9);
                vv_[1] = vv_[0];
                vv_[0] = TT1;
                vv_[7] = vv_[6];
                vv_[6] = Rotate(vv_[5], 19);
                vv_[5] = vv_[4];
                vv_[4] = P0(TT2);
                #endregion
            }
            #endregion

            //256比特的杂凑值y =vv_(j+1) ABCDEFGH
            for (j = 0; j < 8; j++)
            {
                vv[j] ^= vv_[j];
            }

            // Reset
            xOff = 0;
            Array.Copy(X0, 0, X, 0, X0.Length);
        }