public static void Challenge2()
{
const string plaintext = "1c0111001f010100061a024b53535009181c";
const string cipher = "686974207468652062756c6c277320657965";
Console.WriteLine(StringConverters.BitsToHex(StringConverters.HexToBits(plaintext).Xor(StringConverters.HexToBits(cipher))));
}
//Hamming dist
public static int hammingDist(string s1, string s2)
{
int dist = 0;
int[] s1Ints = StringConverters.stringToInts(s1);
int[] s2Ints = StringConverters.stringToInts(s2);
if (s1Ints.Length != s2Ints.Length)
{
throw new Exception("Different lengths");
}
for (int i = 0; i < s1Ints.Length; i++)
{
int temp1 = s1Ints[i];
int temp2 = s2Ints[i];
for (int j = 0; j < 8; j++)
{
if ((temp1 % 2) != (temp2 % 2))
{
dist++;
}
temp1 /= 2;
temp2 /= 2;
}
}
return(dist);
}
public static string decipherCText(string cText, char cipher)
{
BitArray cTextBits = StringConverters.HexToBits(cText);
BitArray cipherBits = StringConverters.CharToBits(cipher, cText.Length / 2);
cTextBits.Xor(cipherBits);
return(StringConverters.BitsToString(cTextBits));
}
public static void Challenge7()
{
StreamReader sr = new StreamReader(@"C:\Users\User\Documents\Visual Studio 2015\Projects\cryptopals\cryptopals\set 1 challenge 7.txt");
string base64 = "";
string temp = "";
while ((temp = sr.ReadLine()) != null)
{
base64 = base64 + temp;
}
BitArray bits = StringConverters.Base64ToBits(base64);
string hex = StringConverters.BitsToHex(bits);
string keyS = "YELLOW SUBMARINE";
byte[] key = new byte[16];
byte[] iv = new byte[16];
for (int i = 0; i < 16; i++)
{
key[i] = Convert.ToByte(keyS[i]);
iv[i] = Convert.ToByte(0);
}
int[] cText = IntConversion.hexToInts(hex);
byte[] cTextB = new byte[cText.Length];
for (int i = 0; i < cText.Length; i++)
{
cTextB[i] = (byte)cText[i];
}
byte[] pTextB = new byte[cText.Length];
int[] pText = new int[cText.Length];
AesManaged alg = new AesManaged {
KeySize = 128, Key = key, BlockSize = 128, Mode = CipherMode.ECB, Padding = PaddingMode.Zeros, IV = iv
};
ICryptoTransform dec = alg.CreateDecryptor(alg.Key, alg.IV);
dec.TransformBlock(cTextB, 0, cText.Length, pTextB, 0);
for (int i = 0; i < cText.Length; i++)
{
pText[i] = pTextB[i];
}
Console.WriteLine(IntConversion.intsToString(pText));
}
public static void Challenge6()
{
StreamReader sr = new StreamReader(@"C:\Users\User\Documents\Visual Studio 2015\Projects\cryptopals\cryptopals\set 1 challenge 6.txt");
string base64 = "";
string temp = "";
while ((temp = sr.ReadLine()) != null)
{
base64 = base64 + temp;
}
BitArray bits = StringConverters.Base64ToBits(base64);
string hex = StringConverters.BitsToHex(bits);
Console.WriteLine(IntMultiVigenere.crackMV(hex));
}
public static string crackMV(string hex)
{
string pText = "";
int[] hexBytes = IntConversion.hexToInts(hex);
int likelyKSize = findKeySize(hexBytes);
List <int[]> transposedBlocks = transposeBlocks(hexBytes, likelyKSize);
List <int[]> decipheredBlocks = new List <int[]>();
for (int i = 0; i < transposedBlocks.Count; i++)
{
decipheredBlocks.Add(StringConverters.stringToInts(IntSingleVigenere.decipherCaesar(IntConversion.intsToHex(transposedBlocks[i])).Item3));
}
pText = IntConversion.intsToString(undoTranspose(decipheredBlocks));
//Console.WriteLine(likelyKSize + " : " + pText);
return(pText);
}
public static void Challenge1()
{
const string hex = "49276d206b696c6c696e6720796f757220627261696e206c696b65206120706f69736f6e6f7573206d757368726f6f6d";
Console.WriteLine(StringConverters.BitsToBase64(StringConverters.HexToBits(hex)));
}
