public Word GetNibble(int block)
{
Word n = new Word(4);
for (int i = 0; i < 4; i++)
n.SetBit(_bits[i + (block * 4)], i);
return n;
}
public static void ApplySerpentSBox(ref Word x0, ref Word x1, ref Word x2, ref Word x3, int round)
{
for (int i = 0; i < x0.Size; i++)
{
Word input = new Word(4);
input.SetBit(x0.GetBit(i), 0);
input.SetBit(x1.GetBit(i), 1);
input.SetBit(x2.GetBit(i), 2);
input.SetBit(x3.GetBit(i), 3);
Word output = SerpentSBox(round, input);
x0.SetBit(output.GetBit(0), i);
x1.SetBit(output.GetBit(1), i);
x2.SetBit(output.GetBit(2), i);
x3.SetBit(output.GetBit(3), i);
}
/* ESKİ
for (int i = 0; i < max; i++)
{
x0.SetNibble(SerpentSBox(round, x0.GetNibble(i)), i);
x1.SetNibble(SerpentSBox(round, x1.GetNibble(i)), i);
x2.SetNibble(SerpentSBox(round, x2.GetNibble(i)), i);
x3.SetNibble(SerpentSBox(round, x3.GetNibble(i)), i);
}
*/
}
public static void ApplySerpentPermutation(ref Word x0, ref Word x1, ref Word x2, ref Word x3)
{
x0.RotateLeft(13);
x2.RotateLeft(3);
x1 = x1 ^ x0 ^ x2;
x3 = x3 ^ x2 ^ (x0 << 3);
x1.RotateLeft(1);
x3.RotateLeft(7);
x0 = x0 ^ x1 ^ x3;
x2 = x2 ^ x3 ^ (x1 << 7);
x0.RotateLeft(5);
x2.RotateLeft(22);
}
public static void ApplySerpentInvSBox(ref Word x0, ref Word x1, ref Word x2, ref Word x3, int round)
{
for (int i = 0; i < x0.Size; i++)
{
Word output = new Word(4);
output.SetBit(x0.GetBit(i), 0);
output.SetBit(x1.GetBit(i), 1);
output.SetBit(x2.GetBit(i), 2);
output.SetBit(x3.GetBit(i), 3);
Word input = SerpentInvSBox(round, output);
x0.SetBit(input.GetBit(0), i);
x1.SetBit(input.GetBit(1), i);
x2.SetBit(input.GetBit(2), i);
x3.SetBit(input.GetBit(3), i);
}
}
public static void SetBitSlice(ref Word[] w, Word slice, int column)
{
if (w.Length != 4 || slice.Size != 4)
throw new Exception("Word Array Size should be 4 and Slice length should be 4");
for (int i = 0; i < 4; i++)
w[i].SetBit(slice.GetBit(i), column);
}
public static Word SerpentSBox(int round, Word input)
{
if (input.Contains('?'))
return Word.Parse("????");
if (input.IsEqualTo("0000"))
return Word.Parse("0000");
int SBoxID = round % 8;
switch (SBoxID)
{
case 0:
// Input: [02] 0010 -> Output: 1???
if (input.IsEqualTo("0010"))
return Word.Parse("1???");
// Input: [04] 0100 -> Output: 1???
if (input.IsEqualTo("0100"))
return Word.Parse("1???");
// Input: [06] 0110 -> Output: 0???
if (input.IsEqualTo("0110"))
return Word.Parse("0???");
break;
case 1:
// Input: [04] 0100 -> Output: ?1??
if (input.IsEqualTo("0100"))
return Word.Parse("?1??");
// Input: [08] 1000 -> Output: ?1??
if (input.IsEqualTo("1000"))
return Word.Parse("?1??");
// Input: [0C] 1100 -> Output: ?0??
if (input.IsEqualTo("1100"))
return Word.Parse("?0??");
break;
case 2:
// Input: [02] 0010 -> Output: ???1
if (input.IsEqualTo("0010"))
return Word.Parse("???1");
// Input: [08] 1000 -> Output: ???1
if (input.IsEqualTo("1000"))
return Word.Parse("???1");
// Input: [0A] 1010 -> Output: ???0
if (input.IsEqualTo("1010"))
return Word.Parse("???0");
break;
case 3:
break;
case 4:
case 5:
// Input: [04] 0100 -> Output: ???1
if (input.IsEqualTo("0100"))
return Word.Parse("???1");
// Input: [0B] 1011 -> Output: ???1
if (input.IsEqualTo("1011"))
return Word.Parse("???1");
// Input: [0F] 1111 -> Output: ???0
if (input.IsEqualTo("1111"))
return Word.Parse("???0");
break;
case 6:
// Input: [02] 0010 -> Output: ??1?
if (input.IsEqualTo("0010"))
return Word.Parse("??1?");
// Input: [04] 0100 -> Output: ??1?
if (input.IsEqualTo("0100"))
return Word.Parse("??1?");
// Input: [06] 0110 -> Output: ??0?
if (input.IsEqualTo("0110"))
return Word.Parse("??0?");
break;
case 7:
break;
}
return Word.Parse("????");
}
public static void OutputToInputProbability(Word output, Word input, int sbox, out int probNumerator, out int probDenominator)
{
if (input.Size != 4 || output.Size != 4)
throw new Exception("Input and output word sizes should be 4!");
Word tmpIn = Word.Parse(input.ToString());
Word tmpOut = Word.Parse(output.ToString());
int[] inQ = tmpIn.QuestionMarkPositions();
int[] outQ = tmpOut.QuestionMarkPositions();
int[] inputValues = new int[0];
int[] outputValues = new int[0];
for (int i = 0; i < (1 << inQ.Length); i++)
{
Word w1 = i.ToWord(inQ.Length);
for (int j = 0; j < inQ.Length; j++)
tmpIn.SetBit(w1.GetBit(j), inQ[j]);
int t = tmpIn.ToInt32();
Array.Resize(ref inputValues, inputValues.Length + 1);
inputValues[inputValues.Length - 1] = t;
}
for (int i = 0; i < (1 << outQ.Length); i++)
{
Word w1 = i.ToWord(outQ.Length);
for (int j = 0; j < outQ.Length; j++)
tmpOut.SetBit(w1.GetBit(j), outQ[j]);
int t = tmpOut.ToInt32();
Array.Resize(ref outputValues, outputValues.Length + 1);
outputValues[outputValues.Length - 1] = t;
}
uint[,] ddt = XORTable(SBox[sbox], 4, 4);
probNumerator = 0;
probDenominator = 0;
// Pay: Olası her bir output value için sadece olası input değerlerinin toplamı
for (int i = 0; i < outputValues.Length; i++)
for (int j = 0; j < inputValues.Length; j++)
probNumerator += (int)ddt[inputValues[j], outputValues[i]];
// Payda: Olası her bir outputValue için tüm input değerlerinin toplamı
for (int i = 0; i < outputValues.Length; i++)
for (int j = 0; j < 16; j++)
probDenominator += (int)ddt[j, outputValues[i]];
return;
}
public static int[] NonZeroColumnPositions(Word[] w)
{
int[] konum = new int[0];
if (w.Length != 4)
throw new Exception("Word list size should be 4!");
for (int i = 0; i < w[0].Size; i++)
{
Word t = Serpent.GetBitSlice(w, i);
if (t.Contains('?') || t.Contains('1'))
{
Array.Resize(ref konum, konum.Length + 1);
konum[konum.Length - 1] = i;
}
}
return konum;
}
public static Word Parse(char[] c)
{
Word w = new Word(c.Length);
for (int i = 0; i < c.Length; i++)
w.SetBit(c[i], i);
return w;
}
public static bool Impossible(Word[] c1, Word[] c2)
{
if ((c1[0].Size != c2[0].Size) || (c1.Length != c2.Length))
throw new Exception("Sizes for Words in arrays should be same!");
for (int i = 0; i < c1.Length; i++)
{
for (int j = 0; j < c1[i].Size; j++)
{
if ((c1[i].GetBit(j) == '1' && c2[i].GetBit(j) == '0') ||
(c1[i].GetBit(j) == '0' && c2[i].GetBit(j) == '1'))
return true;
}
}
return false;
}
void FillW(Word[] w)
{
txtW0.Text = w[0].ToString();
txtW1.Text = w[1].ToString();
txtW2.Text = w[2].ToString();
txtW3.Text = w[3].ToString();
}
void FillO(Word[] o)
{
txtO0.Text = o[0].ToString();
txtO1.Text = o[1].ToString();
txtO2.Text = o[2].ToString();
txtO3.Text = o[3].ToString();
}
private void btnTest1_Click(object sender, EventArgs e)
{
dbg.ClearDebug();
dbg.WriteLine("In Serpent We have broken!\r\n");
Word[] tmpW = new Word[4];
int[] a = new int[] { 2, 4, 5, 9, 10, 14 };
int[] b = new int[] { 5, 7, 12, 14 };
int konuma = 25, konumb = 22;
for (int i = 0; i < a.Length; i++)
{
for (int j = 0; j < b.Length; j++)
{
for (int t = 0; t < 4; t++)
tmpW[t] = Word.Parse("0000 0000 0000 0000 0000 0000 0000 0000");
Word worda = a[i].ToWord(4);
Word wordb = b[j].ToWord(4);
Serpent.SetBitSlice(ref tmpW, worda, konuma);
Serpent.SetBitSlice(ref tmpW, wordb, konumb);
Serpent.ApplySerpentInvPermutation(ref tmpW[0], ref tmpW[1], ref tmpW[2], ref tmpW[3]);
int[] nzcpos = Serpent.NonZeroColumnPositions(tmpW);
string pos = string.Join("-", nzcpos);
dbg.WriteLine(string.Format("a: {0} b: {1} Number of Non-Zero Columns: {2}\r\nPositions: {3}\r\n", a[i], b[j], nzcpos.Length, pos));
}
}
MessageBox.Show("Check Log Screen!");
}
public void SetNibble(Word nb, int block)
{
if (nb.Size != 4)
throw new Exception("Nibble size should be 4!");
for (int i = 0; i < 4; i++)
_bits[i + (block * 4)] = nb.GetBit(i);
}
public static Word operator ^(Word w1, Word w2)
{
if (w1.Size != w2.Size)
throw new Exception("Word sizes should be same!");
Word r = new Word(w1.Size);
for (int i = 0; i < w1.Size; i++)
{
if ((w1.GetBit(i) == '0' && w2.GetBit(i) == '0') ||
(w1.GetBit(i) == '1' && w2.GetBit(i) == '1'))
r.SetBit('0', i);
else if ((w1.GetBit(i) == '0' && w2.GetBit(i) == '1') ||
(w1.GetBit(i) == '1' && w2.GetBit(i) == '0'))
r.SetBit('1', i);
else
r.SetBit('?', i);
}
return r;
}
public static int NonZeroColumnNumber(Word[] w)
{
if (w.Length != 4)
throw new Exception("Word list size should be 4!");
int sayac = 0;
for (int i = 0; i < w[0].Size; i++)
{
if (w[0].GetBit(i) == '0' && w[1].GetBit(i) == '0' && w[2].GetBit(i) == '0' && w[3].GetBit(i) == '0')
sayac++;
}
return 32 - sayac;
}
public static Word GetBitSlice(Word[] w, int column)
{
if (w.Length != 4)
throw new Exception("Word Array Size should be 4 and Slice length should be 4");
Word slice = new Word(4);
for (int i = 0; i < 4; i++)
slice.SetBit(w[i].GetBit(column), i);
return slice;
}
/// <param name="s">LSB value is on the right</param>
public static Word Parse(string str)
{
string s = CleanInputData(str); //str.Replace(" ", "");
Word w = new Word(s.Length);
for (int i = 0; i < s.Length; i++)
w.SetBit(s[s.Length - i - 1], i);
return w;
}