public void ANDIntoThis(LogicANFEquation other)
{
var thisTerms = terms.Keys.ToArray();
this.terms.Clear();
foreach (LogicANDTerm tTerm in thisTerms)
{
foreach (LogicANDTerm oTerm in other.terms.Keys)
{
AddTerm(tTerm.Union(oTerm));
}
}
}
public void SubIntoPlainOr(LogicANFEquation subEq)
{
int subVarID = subEq.SubVarID;
if (!subEq.IsFullyReduced || subVarID == 0)
{
throw new ArgumentException("subEq is not prepared to be substituted in.", "subEq");
}
if (!subEq.IsFullyReduced)
{
throw new ArgumentException("The equation you are trying to substitute into plainOrEq must be fully reduced.", "subEq");
}
bool subVarState = subEq.GetReducedState();
LogicANDTerm subAnd;
subVarID *= -1;
if (subVarState) // we have to reverse the state because we will be inversing the state of subVarID;
{
subAnd = LogicANDTerm.ConstantZero;
}
else
{
subAnd = LogicANDTerm.ConstantOne;
}
var array = plainOrEq.ToArray();
plainOrEq.Clear();
for (int i = 0; i < array.Length; i++)
{
var add = array[i].Key.SubstituteIn(subAnd, subVarID);
if (add.IsConstantOne)
{
throw new Exception("Danger Danger! Logic error by programmer!");
}
if (!plainOrEq.Remove(add))
{
plainOrEq.Add(add, null);
}
}
}
public string Solve()
{
LogicANFEquation[] subEqs = new LogicANFEquation[DataSize * 2];
if (!encryptedData.GetBitState(0))
{
throw new Exception("I'm screwed.");
}
else
{
var isolated = encEqs[0].GetSingleTermVarIDs();
int first = isolated.First();
int last = isolated.Last();
LogicANFEquation newEq1 = new LogicANFEquation();
LogicANFEquation newEq2 = new LogicANFEquation();
newEq1.AddTerm(new LogicANDTerm(new int[] { first }));
newEq2.AddTerm(new LogicANDTerm(new int[] { last }));
newEq1 = subEqs[first.VarIDToIndex()] = newEq1.CreateSubEq(first, true);
newEq2 = subEqs[last.VarIDToIndex()] = newEq2.CreateSubEq(last, true);
for (int i = 0; i < DataSize * 2 - 1; i++)
{
encEqs[i].SubInEq(newEq1);
encEqs[i].SubInEq(newEq2);
}
for (int i = 1; i < DataSize; i++)
{
LogicANFEquation newSub = encEqs[i].CreateSubEq(encryptedData.GetBitState(i));
for (int j = 0; j < DataSize; j++)
{
if (j > i)
{
encEqs[j].SubInEq(newSub);
}
if (subEqs[j] != null)
{
subEqs[j].SubInEq(newSub);
}
}
for (int j = DataSize; j < DataSize * 2; j++)
{
if (subEqs[j] != null)
{
subEqs[j].SubInEq(newSub);
}
}
subEqs[newSub.SubVarID.VarIDToIndex()] = newSub;
}
}
for (int i = 0; i < DataSize * 2; i++)
{
if (subEqs[i] != null && subEqs[i].IsFullyReduced)
{
SubIntoPlainOr(subEqs[i]);
for (int j = 0; j < DataSize * 2 - 1; j++)
{
if (!encEqs[j].IsFullyReduced)
encEqs[j].SubInEq(subEqs[i]);
}
}
}
//encEqs[62].SubInEq(subEqs[63]);
//encEqs[62].CreateSubEq(false);
{
//int i = DataSize;
//while (subEqs[i] == null || subEqs[i].IsFullyReduced)
//{
// i++;
//}
//while (i < DataSize * 2 && subEqs[i] != null && !subEqs[i].IsFullyReduced)
//{
// for (int j = 0; j < DataSize * 2 - 1; j++)
// {
// encEqs[j].SubInEq(subEqs[i]);
// //LogicANFEquation test = null;
// //try
// //{
// // test = encEqs[j].CreateSubEq(encryptedData.GetBitState(j));
// //}
// //catch { }
// //if (j == 60)
// //{
// // //throw new Exception("tell me");
// //}
// }
// i++;
//}
}
StringBuilder sb = new StringBuilder();
sb.AppendLine("SubInEq's by index:");
for (int i = 0; i < DataSize * 2; i++)
{
sb.Append(i);
sb.Append(": ");
if (subEqs[i] == null)
{
sb.Append("No Equation");
}
else
{
subEqs[i].ToStringBuilder(sb);
}
sb.AppendLine();
}
sb.AppendLine();
sb.AppendLine();
sb.AppendLine("EncEq's by index:");
for (int i = 0; i < DataSize * 2; i++)
{
sb.Append(i);
sb.Append(": ");
if (encEqs[i] == null)
{
sb.Append("No Equation");
}
else
{
encEqs[i].ToStringBuilder(sb);
}
sb.AppendLine();
}
sb.AppendLine();
sb.AppendLine();
sb.AppendLine("plainOrEq:");
foreach (var pair in plainOrEq)
{
pair.Key.ToStringBuilder(sb);
sb.AppendLine(" | ");
}
return sb.ToString();
}
public void Initialize()
{
// this next set of 4 repeat loops (nested included) is just a faster way of creating a map of the
// operations done to each bit to end up with the encripted bit located at the same index as the index
// of xorEq[index]. Faster compared to mapping and getting rid of duplicate procedures of the algorithm
// that was provided to us by Nintendo/Alpha Centari.
// The variable IDs are equal to the unencrypted bit index + 1. This makes it easy to indicate inverse states by
// just making the ID negative.
for (int ebitIndex = 0; ebitIndex < DataSize; ebitIndex++)
{
var tmpEq = new LogicANFEquation();
encEqs[ebitIndex] = tmpEq;
for (int termIndex = 0; termIndex <= ebitIndex; termIndex++)
{
int[] tmp = new int[2] { termIndex + 1, DataSize + ebitIndex - termIndex + 1 };
tmpEq.AddTerm(new LogicANDTerm(tmp));
}
}
for (int ebitIndex = DataSize * 2 - 2; ebitIndex >= DataSize; ebitIndex--)
{
var tmpEq = new LogicANFEquation();
encEqs[ebitIndex] = tmpEq;
for (int termIndex = 0; termIndex <= DataSize * 2 - ebitIndex - 2; termIndex++)
{
int[] tmp = new int[2] { ebitIndex - DataSize + 2 + termIndex, DataSize * 2 - termIndex };
tmpEq.AddTerm(new LogicANDTerm(tmp));
}
}
// Build additional masks based on repeated false values from the first bit or the last bit
// These masks will be used as additional equations to further cut down the number of options we have to test.
{
int lastFalseIdx = DataSize * 2 - 2;
while (lastFalseIdx >= DataSize && !encryptedData.GetBitState(lastFalseIdx))
{
lastFalseIdx--;
}
lastFalseIdx++;
int numOfTerms = DataSize * 2 - lastFalseIdx;
int numOfVarPerTerm = numOfTerms - 1;
int firstStart = DataSize * (-1);
int secondStart = DataSize * (-2);
int[] tmpVars = new int[numOfVarPerTerm];
plainOrEq = new SortedDictionary<LogicANDTerm, object>();
if (lastFalseIdx < DataSize * 2 - 2)
{
for (int splitPoint = 0; splitPoint < numOfTerms; splitPoint++)
{
int varIdx = 0;
for (; varIdx < splitPoint; varIdx++)
{
tmpVars[varIdx] = secondStart + varIdx;
}
for (; varIdx < numOfVarPerTerm; varIdx++)
{
tmpVars[varIdx] = firstStart - splitPoint + varIdx;
}
plainOrEq.Add(new LogicANDTerm(tmpVars), null);
}
}
}
}
private void SubInEq(LogicANFEquation other, bool inverse, object diffSig)
{
int otherSubVarID;
if (inverse)
{
otherSubVarID = other.SubVarID * -1;
}
else
{
otherSubVarID = other.SubVarID;
}
var subTerms = other.terms.Keys.ToArray();
var thisTerms = terms.Keys.ToArray();
terms.Clear();
if (subTerms.Length == 0)
{
subTerms = new LogicANDTerm[] { LogicANDTerm.ConstantZero };
}
for (int i = 0; i < thisTerms.Length; i++)
{
if (thisTerms[i].ContainsVarID(otherSubVarID))
{
for (int j = 0; j < subTerms.Length; j++)
{
AddTerm(thisTerms[i].SubstituteIn(subTerms[j], otherSubVarID));
}
if (inverse)
{
AddTerm(thisTerms[i].DeepCopy(otherSubVarID));
}
}
else
{
AddTerm(thisTerms[i]);
}
}
}
private LogicANFEquation CreateSubEq(List<LogicANDTerm> possibles, bool encryptedBitState)
{
bool works = false;
int newSubVarID = 0;
int workIdx;
for (workIdx = possibles.Count - 1; workIdx >= 0; workIdx--)
{
newSubVarID = possibles[workIdx].GetSingleVarID();
works = true;
foreach (var pair in terms)
{
if (pair.Key != possibles[workIdx] && pair.Key.ContainsVarID(newSubVarID))
{
works = false;
break;
}
}
if (works)
{
break;
}
}
if (!works)
{
throw new Exception("Cannot make a subsitution equation from this equation.");
}
LogicANFEquation r = new LogicANFEquation();
r.SubVarID = newSubVarID;
foreach (var pair in terms)
{
if (pair.Key != possibles[workIdx])
{
r.terms.Add(pair.Key, null);
}
}
if (encryptedBitState)
{
r.AddTerm(LogicANDTerm.ConstantOne);
}
return r;
}
public void SubInEq(LogicANFEquation other, bool includeInverse = false)
{
#if DEBUG
if (other.SubVarID == 0)
throw new Exception("You are trying to sub in an LogicEquation that is not preped for subbing.");
#endif
SubInEq(other, false, (object)null);
if (includeInverse)
{
SubInEq(other, true, (object)null);
}
}