public List <StateMatrix> Encrypt()
{
if (Text.Length % 16 != 0)
{
int padding = -(Text.Length % 16 - 16);
Text = Text.PadRight(Text.Length + padding, (char)0);
}
List <StateMatrix> matrixBlocks = new List <StateMatrix>();
for (int i = 0, j = 0; i < Text.Length / 16; i++, j += 16)
{
matrixBlocks.Add(new StateMatrix(Text.Substring(j, 16)));
}
List <StateMatrix> result = new List <StateMatrix>();
foreach (StateMatrix matrix in matrixBlocks)
{
List <Round> rounds = new List <Round>();
Round round = new Round();
round.Matrixes.Add(matrix.RoundsToString("Original"));
StateMatrix state = AddRoundKey(matrix, 0);
round.Matrixes.Add(state.RoundsToString("AddRoundKey"));
rounds.Add(round);
TextRounds.Add(rounds);
for (int i = 1; i <= 9; i++)
{
rounds = new List <Round>();
round = new Round();
state = SubBytes(state);
round.Matrixes.Add(state.RoundsToString("SubBytes"));
state = ShiftRows(state);
round.Matrixes.Add(state.RoundsToString("ShiftRows"));
state = MixColumns(state);
round.Matrixes.Add(state.RoundsToString("MixColumns"));
state = AddRoundKey(state, i);
round.Matrixes.Add(state.RoundsToString("AddRoundKey"));
rounds.Add(round);
TextRounds.Add(rounds);
}
rounds = new List <Round>();
round = new Round();
state = SubBytes(state);
round.Matrixes.Add(state.RoundsToString("SubBytes"));
state = ShiftRows(state);
round.Matrixes.Add(state.RoundsToString("ShiftRows"));
state = AddRoundKey(state, 10);
round.Matrixes.Add(state.RoundsToString("AddRoundKey"));
rounds.Add(round);
TextRounds.Add(rounds);
result.Add(state);
}
return(result);
}
public StateMatrix InvSubBytes(StateMatrix stateMatrix)
{
StateMatrix subbedMatrix = new StateMatrix();
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 4; j++)
{
subbedMatrix[j, i] = FiniteField.InvSBox(stateMatrix[j, i]);
}
}
return(subbedMatrix);
}
public StateMatrix InvShiftRows(StateMatrix stateMatrix)
{
StateMatrix shifted = new StateMatrix();
for (int i = 0; i < 4; i++)
{
int index = i % 4;
for (int j = 0; j < 4; j++)
{
shifted[i, index] = stateMatrix[i, j];
index++;
index %= 4;
}
}
return(shifted);
}
public StateMatrix InvMixColumns(StateMatrix stateMatrix)
{
StateMatrix mixedMatrix = new StateMatrix();
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 4; j++)
{
mixedMatrix[i, j] = new FiniteField();
for (int k = 0; k < 4; k++)
{
mixedMatrix[i, j] += stateMatrix[k, j] * StateMatrix.InvC[i, k];
}
}
}
return(mixedMatrix);
}
public string Decrypt(List <StateMatrix> stateMatrix)
{
string result = "";
foreach (StateMatrix matrix in stateMatrix)
{
List <Round> rounds = new List <Round>();
Round round = new Round();
round.Matrixes.Add(matrix.RoundsToString("Original"));
StateMatrix state = AddRoundKey(matrix, 10);
round.Matrixes.Add(state.RoundsToString("AddRoundKey"));
rounds.Add(round);
InvRounds.Add(rounds);
for (int i = 1; i <= 9; i++)
{
rounds = new List <Round>();
round = new Round();
state = InvShiftRows(state);
round.Matrixes.Add(state.RoundsToString("ShiftRows"));
state = InvSubBytes(state);
round.Matrixes.Add(state.RoundsToString("SubBytes"));
state = AddRoundKey(state, 10 - i);
round.Matrixes.Add(state.RoundsToString("AddRoundKey"));
state = InvMixColumns(state);
round.Matrixes.Add(state.RoundsToString("MixColumns"));
rounds.Add(round);
InvRounds.Add(rounds);
}
rounds = new List <Round>();
round = new Round();
state = InvShiftRows(state);
round.Matrixes.Add(state.RoundsToString("ShiftRows"));
state = InvSubBytes(state);
round.Matrixes.Add(state.RoundsToString("SubBytes"));
state = AddRoundKey(state, 0);
round.Matrixes.Add(state.RoundsToString("AddRoundKey"));
rounds.Add(round);
InvRounds.Add(rounds);
result += state.ToString();
}
return(result);
}
public void GenerateKey()
{
RoundKeys = new List <StateMatrix>();
StateMatrix roundKey = new StateMatrix();
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 4; j++)
{
roundKey[j, i] = new FiniteField(Convert.ToString(EncryptionKey[i * 4 + j], 2).PadLeft(8, '0'));
}
}
FiniteField roundConstant = new FiniteField("00000001");
RoundKeys.Add(roundKey);
for (int round = 1; round <= 10; round++)
{
roundKey = new StateMatrix();
List <FiniteField> word = new List <FiniteField>();
for (int i = 0; i < 4; i++)
{
word.Add(RoundKeys[round - 1][i, 3]);
}
RotWord(word);
SubWord(word);
Rcon(ref roundConstant, round);
word[0] = word[0] + roundConstant;
for (int i = 0; i < 4; i++)
{
roundKey[i, 0] = RoundKeys[round - 1][i, 0] + word[i];
}
for (int i = 1; i < 4; i++)
{
for (int j = 0; j < 4; j++)
{
roundKey[j, i] = RoundKeys[round - 1][j, i] + roundKey[j, i - 1];
}
}
RoundKeys.Add(roundKey);
}
}
public StateMatrix AddRoundKey(StateMatrix a, int round)
{
StateMatrix key = RoundKeys[round];
return(a + key);
}