public double AddWatermarkSubstring(string key_bit, string hmac_sub, int key_idx, int lut_idx)
{
Dictionary <string, string> original_tt = new Dictionary <string, string>(TruthTable);
Dictionary <string, string> tt_sec = new Dictionary <string, string>();
// is the truth table implemented in minterms or maxterms?
string min_maxterm = "1";
// reverse keybit
string incorrect_keybit = key_bit == "1" ? "0" : "1";
foreach (KeyValuePair <string, string> tt_line in original_tt)
{
if (tt_line.Value == "0")
{
min_maxterm = "0";
}
}
while (TruthTable.Count > 0)
{
string tt_entry = TruthTable.Keys.ElementAt <string>(0);
string tt_value = TruthTable[tt_entry];
TruthTable.Remove(tt_entry);
tt_entry = tt_entry.Insert(lut_idx, key_bit);
tt_sec.Add(tt_entry, tt_value);
}
// insert the HMAC, baby!
for (int i = 0; i < hmac_sub.Length; i++)
{
string tt_line = Convert.ToString(i, 2).PadLeft(NumInputs, '0');
tt_line = tt_line.Insert(lut_idx, incorrect_keybit);
// maintain a min/maxterm representation
if (hmac_sub[i].ToString() == min_maxterm)
{
tt_sec.Add(tt_line, min_maxterm);
}
}
TruthTable = tt_sec;
LUTinputs.Insert(lut_idx, "sk[" + key_idx + "]");
this.NumInputs++;
//return HammingDistance(lut_idx);
return(0);
}
private void AddInput(string input)
{
LUTinputs.Add(input);
IsMinimized = false;
}
public void AddKeyInput(string key_bit, int key_idx, int lut_idx)
{
keyIndex = lut_idx;
keyVal = key_bit;
Random rand = new Random();
Dictionary <string, string> tt_sec = new Dictionary <string, string>();
IsMinimized = false;
//string tt_value = "";
//string original_tt_val = expandTruthTable();
Dictionary <string, string> original_tt = new Dictionary <string, string>(TruthTable);
string tmp = "1";
foreach (KeyValuePair <string, string> kvp in TruthTable)
{
if (kvp.Value == "0")
{
tmp = "0";
}
}
while (TruthTable.Count > 0)
{
string tt_entry = TruthTable.Keys.ElementAt <string>(0);
string tt_value = TruthTable[tt_entry];
TruthTable.Remove(tt_entry);
tt_entry = tt_entry.Insert(key_idx, key_bit);
tt_sec.Add(tt_entry, tt_value);
}
NumInputs++;
ContentSize *= 2;
////fill in don't care logic
for (int i = 0; i < NumInputs - 2; i++)
{
StringBuilder tt_entry = new StringBuilder("0".PadLeft(NumInputs, '0'));
string tt_value = tmp;
if (key_bit.Equals("1"))
{
tt_entry[key_idx] = '0';
}
else
{
tt_entry[key_idx] = '1';
}
while (!tt_sec.ContainsKey(tt_entry.ToString()))
{
for (int j = 0; j < NumInputs; j++)
{
if (j == key_idx)
{
continue;
}
if (rand.Next(100) < 20)
{
tt_entry[j] = '1'; // we should use a template (of n input function) instead of random gen. this is just for test.
}
else
{
tt_entry[j] = '-';
}
}
if (tt_entry.ToString().Contains('1'))
{
try
{
tt_sec.Add(tt_entry.ToString(), tt_value);
}
catch { }
}
}
}
LUTinputs.Insert(key_idx, "sk[" + lut_idx + "]");
TruthTable = tt_sec;
string new_tt = expandTruthTable();
secured = true;
var newer_tt = expandTruthTable();
keyBits++;
//hammingDistance = HammingDistance(key_idx);
}
