private void InvMixColumns(ref int[,] arr)
{
int[] temp = new int[4];
int[,] mc = { { 14, 11, 13, 9 }, { 9, 14, 11, 13 }, { 13, 9, 14, 11 }, { 11, 13, 9, 14 } };
for (int col = 0; col < 4; col++)
{
int res;
for (int i = 0; i < 4; i++)
{
res = 0;
for (int j = 0; j < 4; j++)
{
res ^= Kripto.GF_8(mc[i, j], arr[j, col]);
}
temp[i] = res;
}
for (int i = 0; i < 4; i++)
{
arr[i, col] = temp[i];
}
}
}
private void MixColumns(ref int[,] arr)
{
int[] temp = new int[4];
int[,] mc = { { 2, 3, 1, 1 }, { 1, 2, 3, 1 }, { 1, 1, 2, 3 }, { 3, 1, 1, 2 } };
for (int col = 0; col < 4; col++)
{
int res;
for (int i = 0; i < 4; i++)
{
res = 0;
for (int j = 0; j < 4; j++)
{
res ^= Kripto.GF_8(mc[i, j], arr[j, col]);
}
temp[i] = res;
}
for (int i = 0; i < 4; i++)
{
arr[i, col] = temp[i];
}
}
}
