private static byte[][] GenerateRoundKeys(byte[] baseKey, int roundsCount, int Nb, int Nk)
{
int wordsCount = (roundsCount + 1) * Nb;
byte[][] words = new byte[wordsCount][];
for (int i = 0; i < Nk; i++)
{
words[i] = new byte[4];
Array.Copy(baseKey, 4 * i, words[i], 0, 4);
}
for (int i = Nk; i < wordsCount; i++)
{
words[i] = new byte[4];
byte[] temp = new byte[4];
Array.Copy(words[i - 1], temp, 4);
if (i % Nk == 0)
{
RotWord(temp);
SubBytes(temp);
temp[0] ^= RC(i / Nk - 1);
}
else if (Nk == 8 && i % Nk == 4)
{
SubBytes(temp);
}
Array.Copy(words[i - Nk], words[i], 4);
for (int j = 0; j < 4; j++)
{
words[i][j] ^= temp[j];
}
}
byte[][] roundKeys = ArrayEx.Transform(words, roundsCount + 1);
return(roundKeys);
}