// substitute byte using sbox
public byte[][] SubstituteByte(byte[][] currentStage)
{
for (int i = 0; i < Properties.Settings.Default.BLOCK_ROW_SIZE; i++)
{
for (int j = 0; j < Properties.Settings.Default.BLOCK_COLUMN_SIZE; j++)
{
currentStage[i][j] = sBoxInstance.GetSubstituteByte(currentStage[i][j], isInverse);
}
}
return(currentStage);
}
private byte[] GetGResult(byte[] word, int keyConstantNumber)
{
// one byte left shift;
byte[] result = Util.ShiftRow(word, 1, false);
// substitute byte
for (int i = 0; i < result.Length; i++)
{
result[i] = sBoxInstance.GetSubstituteByte(result[i], false); // use sbox substitution
}
// xor with constant
result = Util.WordXOR(result, this.KeyConstant[keyConstantNumber]);
return(result);
}
