public IBF(int size, ICollection<IHashFunc> hashFunctions)
{
_hashSum = new int[size];
_idSum = new long[size];
_count = new int[size];
_hFuncs = hashFunctions;
_hcFunc = new MurmurHash3_x86_32()
{
Seed = 123456789
};
}
//static public void FindCollision(IHashFunc hashFunc, byte[] ex)
//{
// byte[] inp = new byte[ex.Length];
// string hash = "";
// string exHash = Encoding.ASCII.GetString(hashFunc.CalcHash(ex));
// ulong iterationsCounter = 0;
// Stopwatch stopwatch = new Stopwatch();
// stopwatch.Start();
// while (!hash.Equals(exHash))
// {
// iterationsCounter++;
// RandomizeByteArr(inp);
// hash = Encoding.ASCII.GetString(hashFunc.CalcHash(inp));
// }
// stopwatch.Stop();
// Console.WriteLine($"Found in {iterationsCounter} iterations \n Time spent {stopwatch.ElapsedMilliseconds} ms");
//}
//static public void RandomizeByteArr(byte[] inp)
//{
// for (int i = 0; i < inp.Length; ++i)
// inp[i] = (byte)(random.Next(254)+1);
//}
static void ProofOfWork(IHashFunc hashFunc, string initStr, string matched)
{
string hash = "";
ulong iterationsCounter = 0;
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
while (!hash.StartsWith(matched))
{
iterationsCounter++;
hash = Encoding.ASCII.GetString(hashFunc.CalcHash(Encoding.ASCII.GetBytes(initStr + iterationsCounter.ToString())));
}
stopwatch.Stop();
Console.WriteLine($"Found in {iterationsCounter} iterations \n Time spent {stopwatch.ElapsedMilliseconds} ms");
}
int CalcIdx(long id, IHashFunc hFunc)
{
return (int)(BitConverter.ToUInt32(hFunc.ComputeHash(BitConverter.GetBytes(id)), 0) % Size);
}
public void SetHashFunctions(ICollection<IHashFunc> hashFunctions)
{
_hFuncs = hashFunctions;
_hcFunc = new MurmurHash3_x86_32()
{
Seed = 123456789
};
}
