private static uint Inv_Mcol(uint x)
{
uint num = AesLightEngine.FFmulX(x);
uint num2 = AesLightEngine.FFmulX(num);
uint num3 = AesLightEngine.FFmulX(num2);
uint num4 = x ^ num3;
return(num ^ num2 ^ num3 ^ AesLightEngine.Shift(num ^ num4, 8) ^ AesLightEngine.Shift(num2 ^ num4, 16) ^ AesLightEngine.Shift(num4, 24));
}
private uint[][] GenerateWorkingKey(byte[] key, bool forEncryption)
{
int num = key.Length / 4;
if (num != 4 && num != 6 && num != 8)
{
throw new ArgumentException("Key length not 128/192/256 bits.");
}
this.ROUNDS = num + 6;
uint[][] array = new uint[this.ROUNDS + 1][];
for (int i = 0; i <= this.ROUNDS; i++)
{
array[i] = new uint[4];
}
int num2 = 0;
int j = 0;
while (j < key.Length)
{
array[num2 >> 2][num2 & 3] = Pack.LE_To_UInt32(key, j);
j += 4;
num2++;
}
int num3 = this.ROUNDS + 1 << 2;
for (int k = num; k < num3; k++)
{
uint num4 = array[k - 1 >> 2][k - 1 & 3];
if (k % num == 0)
{
num4 = (AesLightEngine.SubWord(AesLightEngine.Shift(num4, 8)) ^ (uint)AesLightEngine.rcon[k / num - 1]);
}
else if (num > 6 && k % num == 4)
{
num4 = AesLightEngine.SubWord(num4);
}
array[k >> 2][k & 3] = (array[k - num >> 2][k - num & 3] ^ num4);
}
if (!forEncryption)
{
for (int l = 1; l < this.ROUNDS; l++)
{
uint[] array2 = array[l];
for (int m = 0; m < 4; m++)
{
array2[m] = AesLightEngine.Inv_Mcol(array2[m]);
}
}
}
return(array);
}
private static uint Mcol(uint x)
{
uint num = AesLightEngine.FFmulX(x);
return(num ^ AesLightEngine.Shift(x ^ num, 8) ^ AesLightEngine.Shift(x, 16) ^ AesLightEngine.Shift(x, 24));
}
