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TrustPilotChallenge/WhiteRabbit/Program.cs

76 lines
2.4 KiB

namespace WhiteRabbit
{
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Numerics;
using System.Security.Cryptography;
using System.Text;
/// <summary>
/// Main class
/// </summary>
public static class Program
{
/// <summary>
/// Main entry point
/// </summary>
public static void Main()
{
var stopwatch = new Stopwatch();
stopwatch.Start();
var processor = new StringsProcessor("poultry outwits ants", 4, ReadInput());
var expectedHashes = new[]
{
"e4820b45d2277f3844eac66c903e84be",
"23170acc097c24edb98fc5488ab033fe",
"665e5bcb0c20062fe8abaaf4628bb154",
};
var expectedHashesAsVectors = new HashSet<Vector<byte>>(expectedHashes.Select(hash => new Vector<byte>(StringToByteArray(hash))));
foreach (var result in AddHashes(processor.GeneratePhrases()))
{
if (expectedHashesAsVectors.Contains(result.Item2))
{
Console.WriteLine($"Found phrase: {result.Item1} (spent {stopwatch.Elapsed})");
}
}
stopwatch.Stop();
Console.WriteLine($"Total time spent: {stopwatch.Elapsed}");
}
// Code taken from http://stackoverflow.com/a/321404/831314
private static byte[] StringToByteArray(string hex)
{
return Enumerable.Range(0, hex.Length)
.Where(x => x % 2 == 0)
.Select(x => Convert.ToByte(hex.Substring(x, 2), 16))
.ToArray();
}
private static IEnumerable<Tuple<string, Vector<byte>>> AddHashes(IEnumerable<string> input)
{
using (MD5 hasher = MD5.Create())
{
foreach (var line in input)
{
var data = hasher.ComputeHash(Encoding.ASCII.GetBytes(line));
yield return Tuple.Create(line, new Vector<byte>(data));
}
}
}
private static IEnumerable<string> ReadInput()
{
string line;
while ((line = Console.ReadLine()) != null)
{
yield return line;
}
}
}
}