public FileMutatedBKG(BasylKeyGenerator keyGen, Stream stream)
{
this.generator = keyGen;
this.cipher = new BESCipher(keyGen);
byte[] extra = new byte[100];
byte[] extra2 = new byte[64];
int amount = 65536;
while (amount != 0)
{
byte[] buffer = new byte[amount];
while (stream.Position + amount < stream.Length)
{
stream.Read(buffer, 0, amount);
cipher.EncryptRight(ref buffer);
cipher.EncryptLeft(ref extra);
cipher.EncryptRight(ref extra2);
}
cipher.EncryptLeft(ref extra2);
cipher.Shuffle(2);
amount /= 2;
}
prg = new PseudoRandomGenerator(256 * 256, "MutatedBKG", 500);
prg.ExpandKey(1);
prg.SetSeedKey(extra);
prg.SetSHA(extra2);
prg.Recycle();
stream.Close();
}
private string GenerateRandomFunction(string keyPhrase)
{
BasylKeyGenerator generator = new BasylKeyGenerator(keyPhrase, BasylKeyGenerator.INITIAL / 4, BasylKeyGenerator.ROUNDS, BasylKeyGenerator.LEFTOFF, BasylKeyGenerator.EXPANSION / 20, BasylKeyGenerator.ADDITIONALKEY, new byte[32], new byte[4], new byte[4], true, new StrongerBasylPseudoAdaptor());
List <String> variables = new List <string>();
List <String> operators = new List <string>();
variables.Add("seed");
variables.Add("pos");
operators.AddRange("+,*,%,^,|,&,+,*,*,+".Split(','));
bool operMode = false;
String res = "pos * seed + pos + ";
while ((generator.GetRandomByte() % 29) != (generator.GetRandomByte() % 29) || !operMode)
{
if (operMode)
{
res += operators[generator.GetRandomByte() % operators.Count] + " ";
operMode = false;
}
else
{
if (generator.GetRandomByte() % 8 == 0)
{
//literal
res += (Math.Abs(BitConverter.ToInt32(new byte[] { generator.GetRandomByte(), generator.GetRandomByte(), generator.GetRandomByte(), generator.GetRandomByte() }, 0)) % 256 * 256 * 12 + " ");
}
else
{
//variable
res += variables[generator.GetRandomByte() % variables.Count] + " ";
}
operMode = true;
}
}
return(res);
}
private string GenerateRandomFunction(string keyPhrase)
{
BasylKeyGenerator generator = new BasylKeyGenerator(keyPhrase, BasylKeyGenerator.INITIAL / 4, BasylKeyGenerator.ROUNDS, BasylKeyGenerator.LEFTOFF, BasylKeyGenerator.EXPANSION / 20, BasylKeyGenerator.ADDITIONALKEY, new byte[32], new byte[4], new byte[4], true, new StrongerBasylPseudoAdaptor());
List<String> variables = new List<string>();
List<String> operators = new List<string>();
variables.Add("seed");
variables.Add("pos");
operators.AddRange("+,*,%,^,|,&,+,*,*,+".Split(','));
bool operMode = false;
String res = "pos * seed + pos + ";
while ((generator.GetRandomByte() % 29) != (generator.GetRandomByte() % 29) || !operMode)
{
if (operMode)
{
res += operators[generator.GetRandomByte() % operators.Count] + " ";
operMode = false;
}
else
{
if (generator.GetRandomByte() % 8 == 0)
{
//literal
res += (Math.Abs(BitConverter.ToInt32(new byte[] { generator.GetRandomByte(), generator.GetRandomByte(), generator.GetRandomByte(), generator.GetRandomByte() }, 0)) % 256 * 256 * 12 + " ");
}
else
{
//variable
res += variables[generator.GetRandomByte() % variables.Count] + " ";
}
operMode = true;
}
}
return res;
}
