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| using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
int[] sbox = new int[] { 3, 14, 1, 10, 4, 9, 5, 6, 8, 14, 2, 11, 0, 4, 6, 7, 15, 8, 5, 3, 9, 13, 12, 1, 10, 11, 15, 2, 13, 12, 0, 5 };
int[] sboxRev = new int[] { 14, 2, 11, 0, 4, 6, 7, 15, 8, 5, 3, 9, 13, 12, 1, 10, 3, 14, 1, 10, 4, 9, 5, 6, 8, 14, 2, 11, 0, 4, 6, 7 };
int[,] chars = new int[32, 32];
int numPairs=8;
int [] chardat0=new int [32];
int chardatmax = 0;
int [] knownP0 = new int [10000];
int [] knownP1 = new int [10000];
int [] knownC0 = new int [10000];
int [] knownC1 = new int [10000];
int goodP0, goodP1, goodC0, goodC1;
private void label1_Click(object sender, EventArgs e)
{
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
int plaintext = Convert.ToInt16(textBox1.Text);
}
private void button1_Click(object sender, EventArgs e)
{
int i, j;
findDiffs(); //Find some good differentials in the S-Boxes
richTextBox1.Text+="Creating XOR differential table:";
for(i = 0; i < 32; i++)
for(j = 0; j < 32; j++)
chars[i ^ j, sbox[i] ^ sbox[j]]++;
for (i=0; i<16;i++)
{
for (j=0; j<16; j++)
richTextBox1.Text+= chars[ i, j] + '\n';
}
int a, b, c, plaint;
c = encrypt(1,2,3);
richTextBox1.Text +="ciphertext is: ";
richTextBox1.Text += c.ToString();
plaint = decrypt(4,5,6);
richTextBox1.Text+="plaintext is:";
richTextBox1.Text+=plaint.ToString();
//encrypt(int a, int b, int c);
//public int decrypt(9, 4, 2);
//int numPairs = 8; //Define number of known pairs
//public string genCharData(4, 7); //Find inputs that lead a certain characteristic
//public string genPairs(4); //Generate chosen-plaintext pairs
//public findGoodPair(7); //Choose a known pair that satisfies the characteristic
//crack(); //Use charData and "good pair" in find key
while (true) {
}
}
public void genPairs(int indiff)
{
Console.WriteLine("\nGenerating %i known pairs with input differential of %i.\n", numPairs, indiff);
Random realk0 = new Random(); //Create random subkey0
Random realk1 = new Random(); //Create random subkey0
Console.WriteLine(" Real K0 = %i\n", realk0);
Console.WriteLine(" Real K1 = %i\n", realk1);
int c;
for (c = 0; c < numPairs; c++) //Create plaintext pairs with XOR difference of indiff
{
Random knownP0 = new Random();
knownP1 = knownP0[c] ^ indiff;
knownC0 = encrypt(knownP0, realk0, realk1);
knownC1 = encrypt(knownP1, realk0, realk1);
}
}
public int roundFunc(int input, int key)
{
return sbox[key ^ input];
}
public int encrypt(int input, int k0, int k1)
{
int x0 = roundFunc(input, k0);
int c = x0 ^ k1;
return c;
}
public int decrypt (int cipher, int k0, int k1)
{
int plaint = k0^ sbox[cipher^k1];
return plaint;
}
public void findDiffs()
{
int c, d, e, f;
int max;
for(c = 0; c < 32; c++)
for(d = 0; d < 32; d++)
// chars[c,d][sbox[c] ^ sbox[d]]++;
for(c = 0; c < 32; c++)
{
for(d = 0; d < 32; d++)
Console.WriteLine (" %x ", chars [c, d]);
Console.WriteLine ("\n");
}
}
public void genCharData(int indiff, int outdiff)
{
Console.WriteLine ("\nGenerating possible intermediate values based on differential(%i —> %i):\n", indiff, outdiff);
chardatmax = 0;
int f;
for (f = 0; f < 32; f++)
{
int myComp = f ^ indiff;
if ((sbox[f] ^ sbox[myComp]) == outdiff)
{
Console.WriteLine (" Possibles: %i + %i —> %i + %i\n", f, myComp, sbox[f], sbox[myComp]);
chardat0[chardatmax] = f;
chardatmax++;
}
}
}
public void findGoodPair(int outdiff)
{
Console.WriteLine("\nSearching for good pair:\n");
int c;
for (c = 0; c < numPairs; c++)
if ((knownC0[] ^ knownC1[]) == outdiff) //Does the ciphertext pair fit the characteristic?
{
goodC0 = knownC0[c];
goodC1 = knownC1[c];
goodP0 = knownP0[c];
goodP1 = knownP1[c];
Console.WriteLine (" FOUND GOOD PAIR: (P0 = %i, P1 = %i) —> (C0 = %i, C1 = %i)\n", goodP0, goodP1, goodC0, goodC1);
return;
}
Console.WriteLine ("NO GOOD PAIR FOUND!\n");
}
private void richTextBox1_TextChanged(object sender, EventArgs e)
{
}
}
} |
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