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Я написал DES на C# с нуля, и я выложу здесь весь код, для меня это кажется правильным, но когда я пытаюсь пример, это не так. Вот мой весь код.DES Шифрование не работает C#
Des Класс:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace DES_Cipher
{
class DES
{
string leftSide = "";
string rightSide = "";
string tempLeft = "";
F_Function f = new F_Function();
Key_Scheduler k = new Key_Scheduler();
public string DESEncryption(string input, string Key)
{
input = String.Join(String.Empty,
input.Select(
c => Convert.ToString(Convert.ToInt32(c.ToString(), 16), 2).PadLeft(4, '0')
)
);
Key = String.Join(String.Empty,
Key.Select(
c => Convert.ToString(Convert.ToInt32(c.ToString(), 16), 2).PadLeft(4, '0')
)
);
// input = strtoBin(input);
string chunk = "";
string finalPerm = "";
string result = "";
string[] subKeys;
//split the string into blocks of 64 bits
IEnumerable<string> output = Enumerable.Range(0, input.Length/64)
.Select(x => input.Substring(x * 64, 64));
string[] newInput = output.ToArray();
//for each block
for (int i = 0; i < newInput.Length; i++)
{
//Initial Permutation
chunk = initalPermutation(newInput[i]);
//split the chunk in two halves 32 bit each
leftSide = chunk.Substring(0, chunk.Length/2);
rightSide = chunk.Substring(chunk.Length/2, chunk.Length/2);
subKeys = k.keySched(Key);
for (int j = 0; j < 16; j++)
{
//F Function on the right side
tempLeft = leftSide;
leftSide = rightSide;
rightSide = f.f_function(rightSide, subKeys[j]);
rightSide = XOR(tempLeft, rightSide);
}
finalPerm = rightSide + leftSide;
finalPerm = finalPermutation(finalPerm);
result = result + finalPerm;
}
result = BinaryStringToHexString(result);
return result;
}
private string initalPermutation(string block)
{
char[] tempBlock ={block[57],block[49],block[41],block[33],block[25],block[17],block[9],block[1],
block[59],block[51],block[43],block[35],block[27],block[19],block[11],block[3],
block[61],block[53],block[45],block[37],block[29],block[21],block[13],block[5],
block[63],block[55],block[47],block[39],block[31],block[23],block[15],block[7],
block[56],block[48],block[40],block[32],block[24],block[16],block[8],block[0],
block[58],block[50],block[42],block[34],block[26],block[18],block[10],block[2],
block[60],block[52],block[44],block[36],block[28],block[20],block[12],block[4],
block[62],block[54],block[46],block[38],block[30],block[22],block[14],block[6]};
string res = new string(tempBlock);
return res;
}
private string finalPermutation(string block)
{
char[] tempBlock ={block[39],block[7],block[47],block[15],block[55],block[23],block[63],block[31],
block[38],block[6],block[46],block[14],block[54],block[22],block[62],block[30],
block[37],block[5],block[45],block[13],block[53],block[21],block[61],block[29],
block[36],block[4],block[44],block[12],block[52],block[20],block[60],block[28],
block[35],block[3],block[43],block[11],block[51],block[19],block[59],block[27],
block[34],block[2],block[42],block[10],block[50],block[18],block[58],block[26],
block[33],block[1],block[41],block[9],block[49],block[17],block[57],block[25],
block[32],block[0],block[40],block[8],block[48],block[16],block[56],block[24]};
string res = new string(tempBlock);
return res;
}
//convert string to binary function
private string strtoBin(string input)
{
StringBuilder sb = new StringBuilder();
foreach (char L in input)
{
sb.Append(Convert.ToString(L, 2).PadLeft(8, '0'));
}
return sb.ToString();
}
private string XOR(string expanedArray, string key)
{
string[] result = new string[key.Length];
string res;
char[] a = expanedArray.ToCharArray();
char[] b = key.ToCharArray();
for (int i = 0; i < key.Length; i++)
{
result[i] = (a[i]^b[i]).ToString();
}
res = string.Join("", result);
return res;
}
private static string BinaryStringToHexString(string binary)
{
StringBuilder result = new StringBuilder(binary.Length/8 + 1);
// TODO: check all 1's or 0's... Will throw otherwise
int mod4Len = binary.Length % 8;
if (mod4Len != 0)
{
// pad to length multiple of 8
binary = binary.PadLeft(((binary.Length/8) + 1) * 8, '0');
}
for (int i = 0; i < binary.Length; i += 8)
{
string eightBits = binary.Substring(i, 8);
result.AppendFormat("{0:X2}", Convert.ToByte(eightBits, 2));
}
return result.ToString();
}
}
}
Key Класс:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace DES_Cipher
{
class Key_Scheduler
{
public static String c0 = "";
public static String d0 = "";
public string[] keySched(string key)
{
string[] keys = new string[16];
string perm1 = "";
//Permutation Choice - 1
perm1 = permuatedchoice1(key);
//split the key in two halves 28 bit each
c0 = perm1.Substring(0, perm1.Length/2);
d0 = perm1.Substring(perm1.Length/2, perm1.Length/2);
for (int i = 0; i < 16; i++)
{
keys[i] = GenerateKeys(c0, d0, i);
}
return keys;
}
private string GenerateKeys(string L, string R,int i)
{
string key;
if (i == 0 || i == 1 || i == 8 || i == 15)
{
c0 = rotateShift(L, 1);
d0 = rotateShift(R, 1);
key = L + R;
key = permuatedchoice2(key);
return key;
}
else
{
c0 = rotateShift(L, 2);
d0 = rotateShift(R, 2);
key = L + R;
key = permuatedchoice2(key);
return key;
}
}
private string rotateShift(string key, int shift)
{
string res="";
string[] result = new string[key.Length];
char[] a = key.ToCharArray();
int index = 0;
for (int i = shift; index < a.Length; i++)
{
result[index++] = a[i % a.Length].ToString();
}
res = string.Join("", result);
return res;
}
private string permuatedchoice1(string key)
{
string res;
char[] tempArr ={key[56],key[48],key[40],key[32],key[24],key[16],key[8],key[0],
key[57],key[49],key[41],key[33],key[25],key[17],key[9],key[1],
key[58],key[50],key[42],key[34],key[26],key[18],key[10],key[2],
key[59],key[51],key[43],key[35],key[62],key[54],key[46],key[38],
key[30],key[22],key[14],key[6],key[61],key[53],key[45],key[37],
key[29],key[21],key[13],key[5],key[60],key[52],key[44],key[36],
key[28],key[20],key[12],key[4],key[27],key[19],key[11],key[3]};
res = new string(tempArr);
return res;
}
private string permuatedchoice2(string key)
{
string res;
char[] tempArr ={key[13],key[16],key[10],key[23],key[0],key[4],key[2],key[27],
key[14],key[5],key[20],key[9],key[22],key[18],key[11],key[3],
key[25],key[7],key[15],key[6],key[26],key[19],key[12],key[1],
key[40],key[51],key[30],key[36],key[46],key[54],key[29],key[39],
key[50],key[44],key[32],key[47],key[43],key[48],key[38],key[55],
key[33],key[52],key[45],key[41],key[49],key[35],key[28],key[31]};
res = new string(tempArr);
return res;
}
}
}
И, наконец, F Функция Класс:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace DES_Cipher
{
class F_Function
{
#region SBoxes definition
int[,] s1Box = {{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7},
{0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8},
{4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0},
{15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13}};
int[,] s2Box = {{15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10},
{3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5},
{0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15},
{13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9}};
int[,] s3Box = {{10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8},
{13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1},
{13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7},
{1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12}};
int[,] s4Box = {{7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15},
{13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9},
{10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4},
{3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14}};
int[,] s5Box = {{2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9},
{14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6},
{4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14},
{11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3}};
int[,] s6Box = {{12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11},
{10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8},
{9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6},
{4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13}};
int[,] s7Box = {{4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1},
{13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6},
{1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2},
{6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12}};
int[,] s8Box = {{13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7},
{1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2},
{7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8},
{2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11}};
#endregion
int[] expanstionArr = new int[48] { 31, 0, 1, 2, 3, 4,
3, 4, 5, 6, 7, 8,
7, 8, 9, 10, 11, 12,
11, 12, 13, 14, 15, 16,
15, 16, 17, 18, 19, 20,
19, 20, 21, 22, 23, 24,
23, 24, 25, 26, 27, 28,
27, 28, 29, 30, 31, 1 };
int[] permutationMatrix = new int[32] { 15, 6, 19, 20, 28, 11, 27, 16,
0, 14, 22, 25, 4, 17, 30, 9,
1, 7, 23, 13, 31, 26, 2, 8,
18, 12, 29, 5, 21, 10, 3, 24 };
Key_Scheduler key = new Key_Scheduler();
public string f_function(string input, string mainKey)
{
string res, exp, xor, sboxsub, perm;
exp = expansion(input);
//subKey =key.keySched(mainKey);
int a = mainKey.Length - exp.Length;
xor=XORwithKey(exp,mainKey);
sboxsub = SBoxSubstitution(xor);
perm = permutation(sboxsub);
res = perm;
return res;
}
private string expansion (string rightSide)
{
char[] arr = new char[48];
int len = rightSide.Length;
for (int i = 0; i < arr.Length; i++)
{
arr[i] = rightSide[expanstionArr[i]];
}
string res = new string(arr);
return res;
}
private string XORwithKey(string expanedArray,string key)
{
string[] result = new string[key.Length];
string res;
char[] a = expanedArray.ToCharArray();
char[] b = key.ToCharArray();
for (int i = 0; i < key.Length; i++)
{
result[i] = (a[i]^b[i]).ToString();
}
res = string.Join("", result);
return res;
}
private string SBoxSubstitution(string input)
{
string res="";
string r;
int row, col, s1, s2, s3, s4, s5, s6, s7, s8;
string c;
char[] temp;
IEnumerable<string> output = Enumerable.Range(0, input.Length/6)
.Select(x => input.Substring(x * 6, 6));
string[] newInput = output.ToArray();
for (int i = 0; i < newInput.Length; i++)
{
temp = newInput[i].ToCharArray();
r = temp[0].ToString()+temp[5].ToString();
row = Convert.ToInt32(r,2);
c = temp[1].ToString() + temp[2].ToString() + temp[3].ToString() + temp[4].ToString();
col = Convert.ToInt32(c,2);
if (i == 0)
{
s1 = SBoxSearch(row, col, s1Box);
res += s1.ToString();
}
else if (i == 1)
{
s2 = SBoxSearch(row, col, s2Box);
res += s2.ToString();
}
else if (i == 2)
{
s3 = SBoxSearch(row, col, s3Box);
res += s3.ToString();
}
else if (i == 3)
{
s4 = SBoxSearch(row, col, s4Box);
res += s4.ToString();
}
else if (i == 4)
{
s5 = SBoxSearch(row, col, s5Box);
res += s5.ToString();
}
else if (i == 5)
{
s6 = SBoxSearch(row, col, s6Box);
res += s6.ToString();
}
else if (i == 6)
{
s7 = SBoxSearch(row, col, s7Box);
res += s7.ToString();
}
else
{
s8 = SBoxSearch(row, col, s8Box);
res += s8.ToString();
}
}
res = strtoBin(res);
return res;
}
private string permutation(string input)
{
char[] arr = new char[32];
for (int i = 0; i < arr.Length; i++)
{
arr[i] = input[permutationMatrix[i]];
}
string res = new string(arr);
return res;
}
private int SBoxSearch(int row, int col, int[,] sBox)
{
int res=0;
for (int i = 0; i < 4; i++)
{
if (i == row)
{
for (int j = 0; j < 16; j++)
{
if (j == col)
{
res = sBox[i, j];
break;
}
else continue;
}
break;
}
else continue;
}
return res;
}
private string strtoBin(string input)
{
StringBuilder sb = new StringBuilder();
foreach (char L in input)
{
sb.Append(Convert.ToString(L, 2).PadLeft(8, '0'));
}
return sb.ToString();
}
}
}
Когда я проверяю его, кстати все входы в гексагоне, мой ввод: 02468aceeca86420
Б Ключ:
0f1571c947d9e859
выход шифрования должен быть:
da02ce3a89ecac3b
Но я получаю этот выход вместо:
019945B853663D50
я дважды проверил все, и я действительно не знаю, что я сделал не так здесь ... Па rdon меня за грязный код, но он был написан менее чем за один день:/
Спасибо за любой кончик
Любой помощи от кого ?! – WT86
Какова ваша ссылка для сравнения, реализация алгоритма, которую вы считаете правильным? –
@ andrei.ciprian Я использовал это как ссылку http://euro.ecom.cmu.edu/resources/elibrary/epay/DES.pdf – WT86