static void Main(string[] args)
{
// getting a string to calculate a hash function
var inputString = ConsoleMessager.AskString();
Console.WriteLine("Task 1.");
// Task 1. Getting hash from initial string value
var mdFourInstance = GetHashFromString(inputString);
// printing results to console
ConsoleMessager.DemonstrateHashResult(inputString, mdFourInstance.ResultHashString);
// Task 2. "The avalanche effect"
Console.WriteLine("Task 2.");
var inputStringWithOneBitChanged = ChangeOneBitInString(inputString);
var mdFourInstanceWithOneBitChanged = GetHashFromString(inputStringWithOneBitChanged);
// printing results to console
ConsoleMessager.DemonstrateHashResult(inputStringWithOneBitChanged, mdFourInstanceWithOneBitChanged.ResultHashString);
var numberOfDifferentBits = CalculateDifferentBits(mdFourInstance.ResultHashBytes, mdFourInstanceWithOneBitChanged.ResultHashBytes);
// printing results to console
ConsoleMessager.ShowDifferentBits(inputString, inputStringWithOneBitChanged, numberOfDifferentBits);
// Task 3. finding a collision.
Console.WriteLine("Task 3.");
FindAndPrintCollision();
// Task 4. Finding prototype
Console.WriteLine("Task 4.");
FindAndPrintPrototype();
}
/// <summary>
/// Task 4. Prototype
/// </summary>
private static void FindAndPrintPrototype()
{
Console.WriteLine("Enter a password:"******"";
int N = 0;
while (prototypeString == "")
{
N++;
var randomString = GetRandomString(L);
var mdFourRandomStringInstance = GetHashFromString(randomString);
var randomHashFirstBitsList = GetBitsList(mdFourRandomStringInstance.ResultHashBytes, k);
var randomHashFirstBitsString = Helper.PrintList(randomHashFirstBitsList);
if (randomHashFirstBitsString == firstBitsString)
{
Console.WriteLine(String.Format("We found a string with the same {0} first bits in hash for your password '{1}'", k, inputPassword));
prototypeString = randomString;
ConsoleMessager.PrintCollisionResults(mdFourInitialInstance.ResultHashString, inputPassword,
mdFourRandomStringInstance.ResultHashString, randomString, randomHashFirstBitsString, N);
}
}
}
