public string EncryptionStart(string PlainText, string CipherKey, bool IsTextBinary)
{
StringBuilder binaryText = null;
if (IsTextBinary == false)
{
PlainText = BaseTransform.FromTextToBinary(PlainText);
}
else
{
//binaryText = PlainText;
}
binaryText = new StringBuilder(BaseTransform.setTextMutipleOf128Bits(PlainText));
StringBuilder EncryptedTextBuilder = new StringBuilder(binaryText.Length);
#region Make All-round keys
Matrix Matrix_CipherKey = new Matrix(BaseTransform.FromHexToBinary(CipherKey));
Keys key = new Keys();
key.setCipherKey(Matrix_CipherKey);
key = this.KeyExpansion(key, false);
#endregion
#region Main Transform
for (int j = 0; j < (binaryText.Length / 128); j++)
{
state = new Matrix(binaryText.ToString().Substring(j * 128, 128));
state = this.AddRoundKey(state, key, 0);
for (int i = 1; i < 11; i++)
{
if (i == 10)
{
state = this.SubBytes(state, false);
state = this.ShiftRows(state, false);
state = this.AddRoundKey(state, key, i);
}
else
{
state = this.SubBytes(state, false);
state = this.ShiftRows(state, false);
state = this.MixColumns(state, false);
state = this.AddRoundKey(state, key, i);
}
}
#endregion
EncryptedTextBuilder.Append(state.ToString());
}
OnEndState(new EndStateArgs(true));
return EncryptedTextBuilder.ToString();
}
public Matrix AddRoundKey(Matrix state, Keys key, int Round)
{
if (Round > key.RoundKeys.Count - 1)
{
throw new IndexOutOfRangeException("The round key is must between 0 and 10 in 128bit AES.");
}
return MatrixMultiplication.XOR(state, key.RoundKeys[Round]);
}
public Keys KeyExpansion(Keys key, bool IsReverse)
{
for (int i = 4; i < key.RoundKeys.Count * 4; i++)
{
string[] Wi_1 = key.RoundKeys[(i - 1) / 4].getWord((i - 1) % 4);
Matrix mat_Wi_1 = new Matrix(4, 1);
mat_Wi_1.setWord(Wi_1, 0);
if (i % 4 == 0)
{
Wi_1 = this.RotWord(Wi_1);
mat_Wi_1.setWord(Wi_1, 0);
mat_Wi_1 = this.SubBytes(mat_Wi_1, false);
mat_Wi_1 = MatrixMultiplication.XOR(mat_Wi_1, TransformTables.Rcon[(i - 1) / 4]);
}
Matrix Wi_4 = new Matrix(4, 1);
Wi_4.setWord(key.RoundKeys[(i - 4) / 4].getWord((i - 4) % 4), 0);
Matrix temp = MatrixMultiplication.XOR(mat_Wi_1, Wi_4);
string[] Wi = temp.getWord(0);
key.RoundKeys[i / 4].setWord(Wi, i % 4);
}
return key;
}
public string DecryptionStart(string PlainText, string CipherKey, bool IsTextBinary)
{
string binaryText = "";
if (IsTextBinary == false)
{
binaryText = BaseTransform.FromTextToBinary(PlainText);
}
else
{
binaryText = PlainText;
}
StringBuilder DecryptedTextBuilder = new StringBuilder(binaryText.Length);
#region Make All-round keys
Matrix Matrix_CipherKey = new Matrix(BaseTransform.FromHexToBinary(CipherKey));
Keys key = new Keys();
key.setCipherKey(Matrix_CipherKey);
key = this.KeyExpansion(key, false);
#endregion
#region Main Transforms
for (int j = 0; j < (binaryText.Length / 128); j++)
{
state = new Matrix(binaryText.Substring(j * 128, 128));
state = this.AddRoundKey(state, key, 10);
for (int i = 9; i >= 0; i--)
{
if (i == 0)
{
state = this.ShiftRows(state, true);
state = this.SubBytes(state, true);
state = this.AddRoundKey(state, key, i);
}
else
{
state = this.ShiftRows(state, true);
state = this.SubBytes(state, true);
state = this.AddRoundKey(state, key, i);
state = this.MixColumns(state, true);
}
}
#region It's for correct subtracted '0' that have added for set text multiple of 128bit
if ((j * 128 + 128) == binaryText.Length)
{
StringBuilder last_text = new StringBuilder(state.ToString().TrimEnd('0'));
int count = state.ToString().Length - last_text.Length;
if ((count % 8) != 0)
{
count = 8 - (count % 8);
}
string append_text = "";
for (int k = 0; k < count; k++)
{
append_text += "0";
}
DecryptedTextBuilder.Append(last_text.ToString() + append_text);
}
#endregion
else
{
DecryptedTextBuilder.Append(state.ToString());
}
}
#endregion
OnEndState(new EndStateArgs(true)); //End of Thread
return DecryptedTextBuilder.ToString();
}
