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namespace WhiteRabbit
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{
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using System;
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using System.Collections.Generic;
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using System.Configuration;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Numerics;
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using System.Security.Cryptography;
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using System.Text;
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/// <summary>
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/// Main class
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/// </summary>
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public static class Program
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{
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/// <summary>
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/// Main entry point
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/// </summary>
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public static void Main()
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{
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var stopwatch = new Stopwatch();
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stopwatch.Start();
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var sourcePhrase = ConfigurationManager.AppSettings["SourcePhrase"];
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var maxWordsInPhrase = int.Parse(ConfigurationManager.AppSettings["MaxWordsInPhrase"]);
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if (sourcePhrase.Where(ch => ch != ' ').Count() + maxWordsInPhrase > 28)
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{
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Console.WriteLine("Only anagrams of up to 27 characters (including whitespace) are allowed");
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return;
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}
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if (maxWordsInPhrase > Constants.MaxNumberOfWords)
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{
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Console.WriteLine($"Only anagrams of up to {Constants.MaxNumberOfWords} words are allowed");
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return;
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}
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if (!BitConverter.IsLittleEndian)
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{
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Console.WriteLine("Only little-endian systems are supported due to MD5Digest optimizations");
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return;
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}
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if (IntPtr.Size != 8)
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{
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Console.WriteLine("Only 64-bit systems are supported due to MD5Digest optimizations");
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}
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var expectedHashesFirstComponentsArray = new uint[8];
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{
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int i = 0;
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foreach (var expectedHash in ConfigurationManager.AppSettings["ExpectedHashes"].Split(','))
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{
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expectedHashesFirstComponentsArray[i] = HexadecimalStringToUnsignedIntArray(expectedHash)[0];
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expectedHashesFirstComponentsArray[i + 1] = HexadecimalStringToUnsignedIntArray(expectedHash)[0];
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i += 2;
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}
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}
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var processor = new StringsProcessor(
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Encoding.ASCII.GetBytes(sourcePhrase),
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maxWordsInPhrase,
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ReadInput());
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Console.WriteLine($"Initialization complete; time from start: {stopwatch.Elapsed}");
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#if DEBUG
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var fastPhrasesCount = processor.GetPhrasesCount();
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Console.WriteLine($"Number of phrases: {fastPhrasesCount}; time from start: {stopwatch.Elapsed}");
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#endif
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stopwatch.Restart();
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processor.CheckPhrases(expectedHashesFirstComponentsArray, (phraseBytes, hashFirstComponent) =>
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{
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var phrase = Encoding.ASCII.GetString(phraseBytes);
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var hash = ComputeFullMD5(phraseBytes);
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Console.WriteLine($"Found phrase for {hash} ({hashFirstComponent:x8}): {phrase}; time from start is {stopwatch.Elapsed}");
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});
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Console.WriteLine($"Done; time from start: {stopwatch.Elapsed}");
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}
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// Code taken from http://stackoverflow.com/a/321404/831314
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private static uint[] HexadecimalStringToUnsignedIntArray(string hex)
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{
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return Enumerable.Range(0, hex.Length)
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.Where(x => x % 8 == 0)
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.Select(x => ChangeEndianness(hex.Substring(x, 8)))
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.Select(hexLe => Convert.ToUInt32(hexLe, 16))
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.ToArray();
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}
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// We can afford to spend some time here; this code will only run for matched phrases (and for one in several billion non-matched)
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private static string ComputeFullMD5(byte[] phraseBytes)
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{
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using (var hashAlgorithm = new MD5CryptoServiceProvider())
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{
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var resultBytes = hashAlgorithm.ComputeHash(phraseBytes);
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return string.Concat(resultBytes.Select(b => b.ToString("x2")));
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}
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}
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private static string ChangeEndianness(string hex)
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{
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return hex.Substring(6, 2) + hex.Substring(4, 2) + hex.Substring(2, 2) + hex.Substring(0, 2);
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}
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private static IEnumerable<byte[]> ReadInput()
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{
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string line;
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while ((line = Console.ReadLine()) != null)
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{
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yield return Encoding.ASCII.GetBytes(line);
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}
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}
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}
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}
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