/// <summary>
/// Generates the whole Table and fills values to the field (uint[,,])Tables.
/// This part is also known as Precomputation part.
/// </summary>
public bool GenerateTables()
{
// For every table
for (uint tValue = 0; tValue < _numberOfTables; tValue++)
{
// for every row
for (uint mValue = 0; mValue < _m; mValue++)
{
uint rowValue = (_m * tValue) + mValue;
// construct starting point and ending point
// starting point is mValue
// compute ending point
uint endPoint = rowValue;
for (int i = 0; i < _t; i++)
{
endPoint = CryptoTools.OneWayFunction32Bit(endPoint);
}
// fill the byte array
Tables[tValue, mValue, 0] = rowValue;
Tables[tValue, mValue, 1] = endPoint;
}
if (TableProcessed != null)
{
TableProcessed(tValue + 1);
}
}
return(true);
}
public uint?FindPreimageValue(uint hashValue)
{
// her tablo için
for (uint i = 0; i < _numberOfTables; i++)
{
// her bir satırda ending point e bak
for (int j = 0; j < _m; j++)
{
uint aradigimizsayi = Tables[i, j, 0];
uint aradigimizsayininhashi = Tables[i, j, 1];
// hash al bak
for (int k = 0; k < _t; k++)
{
aradigimizsayininhashi = CryptoTools.OneWayFunction32Bit(aradigimizsayi);
if (aradigimizsayininhashi == hashValue)
{
return(aradigimizsayi);
}
aradigimizsayi = aradigimizsayininhashi;
}
}
}
return(null);
}
