public static string DecryptMessage(byte[] inputPlain, Key k, int nrOfIterations)
{
State outputState = new State(inputPlain);
outputState = outputState.addRoundKey(k, nrOfIterations);
for (int i = nrOfIterations - 1; i > 0; i--)
{
outputState = outputState.shiftRowsInv();
outputState = outputState.subBytesInv();
outputState = outputState.addRoundKey(k, i);
outputState = outputState.mixColumnsInv();
}
outputState = outputState.shiftRowsInv();
outputState = outputState.subBytesInv();
outputState = outputState.addRoundKey(k, 0);
return(outputState.ToString());
}
public static string EncryptMessage(byte[] inputPlain, Key k, int nrOfIterations)
{
State inputState = new State(inputPlain);
inputState = inputState.addRoundKey(k, 0);
for (int i = 1; i < nrOfIterations; i++)
{
inputState = inputState.subBytes();
inputState = inputState.shiftRows();
inputState = inputState.mixColumns();
inputState = inputState.addRoundKey(k, i);
}
inputState = inputState.subBytes();
inputState = inputState.shiftRows();
inputState = inputState.addRoundKey(k, nrOfIterations);
Console.Out.WriteLine(inputState.ToMatrixString());
return(inputState.ToString());
}
public void TestAddRoundKey0()
{
string s = "12345689abcdefgh";
byte[] inputKey = { 0x11, 0x22, 0x33, 0x44,
0x55, 0x66, 0x77, 0x88,
0x99, 0x00, 0xaa, 0xbb,
0xcc, 0xdd, 0xee, 0xff };
byte[] expectedStateData = { 32, 16, 0, 112, 96, 80, 79, 177, 248, 98, 201, 223, 169, 187, 137, 151 };
State expectedState = new State(expectedStateData);
Encoding encoding = Encoding.UTF8;
byte[] inputPlain = encoding.GetBytes(s);
Key key = new Key(inputKey);
State start = new State(inputPlain);
start = start.addRoundKey(key, 0);
Console.Out.WriteLine("add0:\n" + start);
Assert.AreEqual(start.ToString(), expectedState.ToString());
}
public void TestAddRoundKey7()
{
string s = "12345689abcdefgh";
byte[] inputKey = { 0x11, 0x22, 0x33, 0x44,
0x55, 0x66, 0x77, 0x88,
0x99, 0x00, 0xaa, 0xbb,
0xcc, 0xdd, 0xee, 0xff };
byte[] expectedStateData = { 42, 45, 180, 25, 155, 188, 117, 243, 155, 228, 10, 60, 124, 122, 249, 208 };
State expectedState = new State(expectedStateData);
Encoding encoding = Encoding.UTF8;
byte[] inputPlain = encoding.GetBytes(s);
Key key = new Key(inputKey);
State start = new State(inputPlain);
start = start.addRoundKey(key, 7);
Console.Out.WriteLine("add7:\n" + start);
Assert.AreEqual(start.ToString(), expectedState.ToString());
}
