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 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 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("????"));
}