public void TestBlockify()
{
var message = "YELLOW SUBMARINE";
Console.WriteLine("input: {0}", message);
var input = Basic.AsciiToBytes(message);
var blocked = Basic.Aes.Util.Blockify(input, 4, input.Length / 4);
for (var i = 0; i < blocked.GetLength(0); i++)
{
for (var j = 0; j < blocked.GetLength(1); j++)
{
Console.Write((char)blocked[i, j] + " ");
}
Console.Write('\n');
}
var unblocked = Basic.Aes.Util.Unblockify(blocked);
var output = Basic.BytesToAscii(unblocked);
Console.WriteLine("output: {0}", output);
Assert.AreEqual(message, output);
}
public void TestS1C3()
{
const string cipherText = "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736";
var tests = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
var results = new List <Tuple <double, char, string> >();
for (var i = 0; i < tests.Length; i++)
{
var key = ((int)tests[i]).ToString("X");
var keyBytes = Basic.HexToBytes(key);
var cipherTextBytes = Basic.HexToBytes(cipherText);
var plainBytes = Basic.XorRepeatKey(cipherTextBytes, keyBytes);
var score = Basic.IsEnglish(plainBytes, Basic.EnglishCharacterFrequencies);
var plainText = Basic.BytesToAscii(plainBytes);
results.Add(new Tuple <double, char, string>(score, tests[i], plainText));
}
results.Sort((firstPair, nextPair) => nextPair.Item1.CompareTo(firstPair.Item1));
foreach (var result in results)
{
Console.WriteLine("{0:P1} - key: {1} - message: {2}", result.Item1, result.Item2, result.Item3.Replace("\n", "\\n"));
}
}
public void TestS1C7()
{
const string key = "YELLOW SUBMARINE";
const string path = @"..\..\Assets\S1C7.txt";
var input = Basic.Base64ToBytes(Basic.GetFileText(path));
var keyBytes = Basic.AsciiToBytes(key);
var message = Basic.Aes.RunAes(input, keyBytes, true);
var control = Basic.Aes.MSDecryptAes128Ecb(input, keyBytes);
Console.WriteLine(Basic.BytesToAscii(message));
Assert.AreEqual(message, control);
}
public void TestAesBlock()
{
// http://seit.unsw.adfa.edu.au/staff/sites/lpb/src/AEScalc/
var key = Basic.HexToBytes("000102030405060708090a0b0c0d0e0f");
var text = Basic.HexToBytes("00112233445566778899aabbccddeeff");
var cipherText = Basic.HexToBytes("69c4e0d86a7b0430d8cdb78070b4c55a");
var cipher = Basic.Aes.RunAes(text, key);
var decipher = Basic.Aes.RunAes(cipher, key, true);
Console.WriteLine(Basic.BytesToAscii(decipher));
CollectionAssert.AreEqual(cipher, cipherText);
CollectionAssert.AreEqual(decipher, text);
}
public void TestS1C4()
{
const string path = @"..\..\Assets\S1C4.txt";
var ciphers = new List <string>();
var cipherMatches = new List <List <Tuple <double, byte, char> > >();
using (var r = new StreamReader(path))
{
string line;
while ((line = r.ReadLine()) != null)
{
List <Tuple <double, byte, char> > matches;
var score = Basic.IsLanguage(Basic.HexToBytes(line), Basic.EnglishCharacterFrequencies, out matches);
if (score <= 0.8)
{
continue;
}
ciphers.Add(line);
cipherMatches.Add(matches);
}
}
for (var i = 0; i < ciphers.Count; i++)
{
var cipher = ciphers[i];
var cipherMatch = cipherMatches[i];
Console.WriteLine("\n-- Cipher: {0} --", cipher);
var keys = Basic.GetKeysFromLanguageMatches(cipherMatch, 5);
foreach (var key in keys)
{
var translation = Basic.XorRepeatKey(Basic.HexToBytes(cipher), new[] { key });
if (Basic.IsEnglish(translation, Basic.EnglishCharacterFrequencies) > 0.5)
{
Console.WriteLine("key: {0}[{1}] - trans: {2}",
Basic.BytesToHex(new[] { key }),
Basic.BytesToAscii(new[] { key }),
Basic.BytesToAscii(translation));
}
}
}
}
public void TestIsLanguage()
{
const string path = @"..\..\Assets\TestIsEnglishDistributed.txt";
string plaintext;
using (var s = new StreamReader(path))
{
plaintext = s.ReadToEnd().ToLower();
}
var bytes = Basic.AsciiToBytes(plaintext);
List <Tuple <double, byte, char> > matches;
var score = Basic.IsLanguage(bytes, Basic.EnglishCharacterFrequencies, out matches);
var keys = new Dictionary <byte, double>();
Console.WriteLine("-- {0:P} similar to English character distribution --", score);
foreach (var match in matches)
{
var key = Basic.Xor(Basic.AsciiToBytes(match.Item3 + ""), new[] { match.Item2 });
if (keys.ContainsKey(key[0]))
{
keys[key[0]] += match.Item1;
}
else
{
keys.Add(key[0], match.Item1);
}
Console.WriteLine("Score: {0:P} - Char: {1} - Byte: {2} - Key: {3}",
match.Item1, match.Item3,
Basic.BytesToAscii(new[] { match.Item2 }),
Basic.BytesToHex(key));
}
Console.WriteLine("\n-- Possible Keys --");
foreach (var key in keys.OrderByDescending(x => x.Value))
{
Console.WriteLine("score: {0:P} - key: {1}", key.Value, Basic.BytesToHex(new[] { key.Key }));
}
}
public void TestGetRepeatKeySplit()
{
const string message = "0000011111";
Console.WriteLine("Message: {0}\n", message);
var messageB = Basic.AsciiToBytes(message);
var split2 = Basic.GetRepeatKeySplit(messageB, 2);
var split5 = Basic.GetRepeatKeySplit(messageB, 5);
Console.WriteLine("Split on 2key:\n");
foreach (var split in split2)
{
Console.WriteLine(Basic.BytesToAscii(split));
}
Console.WriteLine("\nSplit on 5key:\n");
foreach (var split in split5)
{
Console.WriteLine(Basic.BytesToAscii(split));
}
}
public void TestS1C6()
{
const int maxKeysize = 40;
const string filePath = @"..\..\Assets\S1C6.txt";
string cipherText;
using (var s = new StreamReader(filePath))
{
var sb = new StringBuilder();
while (!s.EndOfStream)
{
sb.Append(s.ReadLine());
}
cipherText = sb.ToString();
}
var cipherBytes = Basic.Base64ToBytes(cipherText);
// TODO REMOVE THIS
//var cipherText = 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//var maxKeysize = 3;
//var cipherBytes = Basic.HexToBytes(cipherText);
var keysize = Basic.GetKeysize(cipherBytes, maxKeysize, 8);
var cipherBlocks = Basic.GetRepeatKeySplit(cipherBytes, keysize);
const int numKeysToTry = 4;
var keys = new List <byte[]>();
for (var i = 0; i < numKeysToTry; i++)
{
keys.Add(new byte[keysize]);
}
for (var i = 0; i < cipherBlocks.Count; i++)
{
List <Tuple <double, byte, char> > matches;
Basic.IsLanguage(cipherBlocks[i], Basic.EnglishCharacterFrequencies, out matches);
var keyBytes = Basic.GetKeysFromLanguageMatches(matches, numKeysToTry);
for (var j = 0; j < keyBytes.Count(); j++)
{
keys[j][i] = keyBytes[j];
}
}
var snippet = new byte[200];
Array.Copy(cipherBytes, snippet, 200);
var bestKey = new byte[keysize];
double mostEnglish = 0;
foreach (var key in keys)
{
var messageBytes = Basic.XorRepeatKey(snippet, key);
var englishLikeness = Basic.IsEnglish(messageBytes, Basic.EnglishCharacterFrequencies);
if (englishLikeness > mostEnglish)
{
mostEnglish = englishLikeness;
bestKey = key;
}
}
Console.WriteLine(Basic.BytesToAscii(Basic.XorRepeatKey(cipherBytes, bestKey)));
}
