private Bit[] UnboxingFourBits(Bit[] sixBits, int boxIndex)
{
Bit[] binRow = { sixBits.First(), sixBits.Last() };
Bit[] binCol = { sixBits[1], sixBits[2], sixBits[3], sixBits[4] };
int decRow = BinaryNumbersMapper.TwoBitsDecimalMapping[binRow];
int decCol = BinaryNumbersMapper.FourBitsDecimalMapping[binCol];
SBox sBox = SBoxMapper.S[boxIndex];
byte decSBoxEquivalent = sBox[decRow][decCol];
Bit[] strippedBits = StripFourBits(decSBoxEquivalent);
return(strippedBits);
}
private void SKS(WUPfunc wup, SBox S, uint[] w, uint w0, uint w1, uint w2, uint w3, int i0, int i1, int i2, int i3, int ofs)
{
wup(w, ofs);
uint[] r = new uint[5];
r[0] = w[w0];
r[1] = w[w1];
r[2] = w[w2];
r[3] = w[w3];
r[4] = 0;
S(ref r[0], ref r[1], ref r[2], ref r[3], ref r[4]);
serpent24SubKeys[ofs] = r[i0];
serpent24SubKeys[ofs + 1] = r[i1];
serpent24SubKeys[ofs + 2] = r[i2];
serpent24SubKeys[ofs + 3] = r[i3];
}
/*
* One Serpent round.
* ofs = current subkey counter
* S = S-box for this round
* i0 to i4 = input register numbers (the fifth is a scratch register)
* o0 to o3 = output register numbers
*/
private void Serpent_Round(int ofs, SBox S, uint[] r, int i0, int i1, int i2, int i3, int i4, int o0, int o1, int o2, int o3)
{
KeyAddition(ref r[i0], ref r[i1], ref r[i2], ref r[i3], ofs);
S(ref r[i0], ref r[i1], ref r[i2], ref r[i3], ref r[i4]);
Serpent_LinearTransform(ref r[o0], ref r[o1], ref r[o2], ref r[o3]);
}
static void GenerateSubstitutionTable(
SBox name,
string switchVariable = "INPUT",
string assignVariable = "OUTPUT",
string entityName = "ENTITY_NAME",
string architectureName = "ARCHITECTURE_NAME")
{
byte mask = 15; // 0b00001111
var result = InitSBoxHeader(switchVariable, entityName, architectureName);
int counter = 0;
switch (name)
{
case SBox.AesSbox:
var aesSbox = TableValues.AesSBox();
foreach (var row in aesSbox)
{
foreach (var number in row)
{
int columnIndex = counter & mask;
int rowIndex = (counter >> 4) & mask;
string newValue = GetBinaryValue(aesSbox[rowIndex][columnIndex], 8);
string counterValue = GetBinaryValue(counter++, 8);
result.Add($"\t\twhen \"{counterValue}\" => {assignVariable} <= \"{newValue}\";");
}
}
result.Add("end case;");
result.Add("end process;");
result.Add($"end {architectureName};");
File.WriteAllLines(_path + "AesSbox.vhd", result);
break;
case SBox.AesSboxInv:
var aesSboxInv = TableValues.AesSBoxInv();
foreach (var row in aesSboxInv)
{
foreach (var number in row)
{
int columnIndex = counter & mask;
int rowIndex = (counter >> 4) & mask;
string newValue = GetBinaryValue(aesSboxInv[rowIndex][columnIndex], 8);
string counterValue = GetBinaryValue(counter++, 8);
result.Add($"\twhen \"{counterValue}\" => {assignVariable} <= \"{newValue}\";");
}
}
result.Add("end case;");
result.Add("end process;");
result.Add($"end {architectureName};");
File.WriteAllLines(_path + "AesSboxInv.vhd", result);
break;
case SBox.Des1:
var des1 = TableValues.DesSBox(1);
GenerateDesSbox(des1, "Des1", assignVariable, entityName, architectureName: architectureName);
break;
case SBox.Des2:
var des2 = TableValues.DesSBox(2);
GenerateDesSbox(des2, "Des2", assignVariable, architectureName);
break;
case SBox.Des3:
var des3 = TableValues.DesSBox(3);
GenerateDesSbox(des3, "Des3", assignVariable, architectureName);
break;
case SBox.Des4:
var des4 = TableValues.DesSBox(4);
GenerateDesSbox(des4, "Des4", assignVariable, architectureName);
break;
case SBox.Des5:
var des5 = TableValues.DesSBox(5);
GenerateDesSbox(des5, "Des5", assignVariable, architectureName);
break;
case SBox.Des6:
var des6 = TableValues.DesSBox(6);
GenerateDesSbox(des6, "Des6", assignVariable, architectureName);
break;
case SBox.Des7:
var des7 = TableValues.DesSBox(7);
GenerateDesSbox(des7, "Des7", assignVariable, architectureName);
break;
case SBox.Des8:
var des8 = TableValues.DesSBox(8);
GenerateDesSbox(des8, "Des8", assignVariable, entityName, architectureName: architectureName);
break;
}
}
private Key()
{
KeyWords = new byte[Properties.Settings.Default.NUMBER_OF_KEY_WORDS][];
InitializeKeyConstant();
sBoxInstance = SBox.GetSBoxInstance;
}
// create sbox and mixcolumn instance for next use
public EncryptDecryptRoundStep()
{
sBoxInstance = SBox.GetSBoxInstance;
mixColumnInstance = MixColumn.GetMixColumnInstance;
}
