des算法2

時間 2019-11-17

標籤 des 算法简体版

原文原文鏈接

#include<iostream>
using namespace std;ios

typedef unsigned char uchar;oop

const char PC1_Table[56] =
{ 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,
27, 19, 11, 3, 60, 52, 44, 36, 63, 55, 47, 39, 31, 23, 15, 7, 62, 54,
46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4 };加密

const char PC2_Table[48] =
{ 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, 23, 19, 12, 4, 26, 8, 16, 7, 27,
20, 13, 2, 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, 44, 49, 39,
56, 34, 53, 46, 42, 50, 36, 29, 32 };spa

const char IP_Table[64] =
{ 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, 62, 54, 46, 38,
  30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, 57, 49, 41, 33, 25, 17, 9,
  1, 59, 51, 43, 35, 27, 19, 11, 3, 61, 53, 45, 37, 29, 21, 13, 5, 63, 55,
  47, 39, 31, 23, 15, 7 };orm

const char IPR_Table[64] =
{ 40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31, 38, 6, 46, 14,
  54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29, 36, 4, 44, 12, 52, 20,
  60, 28, 35, 3, 43, 11, 51, 19, 59, 27, 34, 2, 42, 10, 50, 18, 58, 26,
  33, 1, 41, 9, 49, 17, 57, 25 };ip

const char E_Table[48] =
{ 32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16,
17, 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25, 24, 25, 26, 27, 28,
29, 28, 29, 30, 31, 32, 1 };ci

const char S_Box[8][4][16] =
{
  // S1
  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,
  // S2
  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,
  // S3
  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,
  // S4
  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,
  // S5
  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,
  // S6
  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,
  // S7
  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,
  // S8
  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 };it

const char P_Table[32] =
{ 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, 2, 8, 24, 14, 32,
27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25 };io

const char LOOP_Table[16] =
{ 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };form

//把BYTE轉化爲Bit流
static void ByteToBit(bool *Out, const unsigned char *In, int bits)
{
for (int i = 0; i < bits; ++i)
Out[i] = (In[i >> 3] >> (7 - i & 7)) & 1;
}

//把Bit轉化爲Byte流
static void BitToByte(unsigned char *Out, const bool *In, int bits)
{
memset(Out, 0, bits >> 3);
for (int i = 0; i < bits; ++i)
Out[i >> 3] |= In[i] << (7 - i & 7);
}

//把兩個Bit流按表進行位轉化
static void Transform(bool *Out, bool *In, const char *Table, int len)
{
bool Tmp[256];

for (int i = 0; i < len; ++i)
Tmp[i] = In[Table[i] - 1];
memcpy(Out, Tmp, len);
}

//循環左移
static void RotateL(bool *In, int len, int loop)
{
bool Tmp[256];

memcpy(Tmp, In, loop);
memcpy(In, In + loop, len - loop);
memcpy(In + len - loop, Tmp, loop);
}

//兩個比特流模2相加
static void Xor(bool *InA, const bool *InB, int len)
{
for (int i = 0; i < len; ++i)
InA[i] ^= InB[i];
}

//用8個S盒產生32位結果
static void S_func(bool Out[32], const bool In[48])
{
for (char i = 0, j, k; i < 8; ++i, In += 6, Out += 4)
{
j = (In[0] << 1) + In[5];
k = (In[1] << 3) + (In[2] << 2) + (In[3] << 1) + In[4]; //組織SID下標

for (int l = 0; l < 4; ++l) //把相應4bit賦值
Out[l] = (S_Box[i][j][k] >> (3 - l)) & 1;
}
}

//實現數據加密到輸出P
static void F_func(bool In[32], const bool Ki[48])
{
bool MR[48];
Transform(MR, In, E_Table, 48);
Xor(MR, Ki, 48);
S_func(In, MR);
Transform(In, In, P_Table, 32);
}

//生成16個48位的子密鑰
void SetSubKey(bool pSubKey[16][48], const unsigned char Keys[8])
{
bool bK[64], bKCD[56], *bKC = &bK[0], *bKD = &bK[28];
ByteToBit(bK, Keys, 64);
Transform(bKC, bK, PC1_Table, 56);
for (int i = 0; i < 16; ++i)
{
  RotateL(bKC, 28, LOOP_Table[i]);
  RotateL(bKD, 28, LOOP_Table[i]);
  Transform(pSubKey[i], bKCD, PC2_Table, 48);
}
}

void EncryptOfDES(unsigned char Out[8], const unsigned char In[8],
  bool pSubKey[16][48])
{
bool bM[64], bTmp[32], *bL = &bM[0], *bR = &bM[32];
ByteToBit(bM, In, 64);
Transform(bM, bM, IP_Table, 64);
for (int i = 0; i < 16; i++)
{
  memcpy(bTmp, bR, 32); //Ri[i-1] 保存
  F_func(bR, pSubKey[i]); //Ri[i-1]通過轉化和SBox輸出爲P
  Xor(bR, bL, 32); //Ri[i] = P XOR Li[i-1]
  memcpy(bL, bTmp, 32); //Li[i] = Ri[i-1]
}
RotateL(bM, 64, 32); //Ri與Li換位重組M
Transform(bM, bM, IPR_Table, 64); //最後結果進行轉化
BitToByte(Out, bM, 64);
}

void JiemiOfDES(unsigned char Out[8], const unsigned char In[8],
  bool pSubKey[16][48])
{
bool bM[64], bTmp[32], *bL = &bM[0], *bR = &bM[32];
ByteToBit(bM, In, 64);
Transform(bM, bM, IP_Table, 64);
for (int i = 15; i >= 0; i--)
{
  memcpy(bTmp, bR, 32); //Ri[i-1] 保存
  F_func(bR, pSubKey[i]); //Ri[i-1]通過轉化和SBox輸出爲P
  Xor(bR, bL, 32); //Ri[i] = P XOR Li[i-1]
  memcpy(bL, bTmp, 32); //Li[i] = Ri[i-1]
}
RotateL(bM, 64, 32); //Ri與Li換位重組M
Transform(bM, bM, IPR_Table, 64); //最後結果進行轉化
BitToByte(Out, bM, 64);
}

int main()
{
uchar cPlainText[8];
bool bPlainText[64];
uchar cCipherText[8];
uchar ccCipherText[64];
bool bCipherText[64];
uchar cKeys[8];
bool pSubKey[16][48];
char flag = 'a';
cout << "請選擇：" << endl << "a)加密" << endl << "b)解密" << endl << "q)退出"
   << endl;
cin >> flag;
while (flag != 'q')
{
  if (flag == 'a')
  {
   cout << "請輸入8字節明文：";
   cin >> cPlainText;
   cout << "請輸入8字節密鑰：";
   cin >> cKeys;
   //cout<<"明文："<<cPlainText<<endl;
   //cout<<"密鑰："<<cKeys<<endl;
   SetSubKey(pSubKey, cKeys);
   EncryptOfDES(cCipherText, cPlainText, pSubKey);
   ByteToBit(bCipherText, cCipherText, 64);
   cout << "密文(Bit) ：";
   for (int i = 0; i < 64; i++)
   {
    if (bCipherText[i])
     cout << '1';
    else
     cout << '0';
   }
   cout << endl;
   /*
    cout<<"密文(Byte)：";
    for(int i=0;i<8;i++)
    {
    cout<<cCipherText[i];
    }
    cout<<endl;
    */
  } else if (flag == 'b')
  {
   cout << "請輸入64Bit密文：" << endl;
   cin >> ccCipherText;
   for (int i = 0; i < 64; i++)
   {
    if (ccCipherText[i] == '0')
     bCipherText[i] = 0;
    else if (ccCipherText[i] == '1')
     bCipherText[i] = 1;
    else
    {
     cout << "輸入錯誤" << endl;
     break;
    }
   }
   BitToByte(cCipherText, bCipherText, 64);
   cout << "請輸入8字節密鑰：";
   cin >> cKeys;
   SetSubKey(pSubKey, cKeys);
   JiemiOfDES(cPlainText, cCipherText, pSubKey);
   ByteToBit(bPlainText, cPlainText, 64);
   cout << "明文：";
   for (int i = 0; i < 8; i++)
   {
    char a = (char) cPlainText[i];
    cout << a;
   }
   cout << endl;
  } else
   cout << "輸入錯誤，請從新輸入！" << endl;
  cout << "請選擇：" << endl << "a)加密" << endl << "b)解密" << endl << "q)退出"
    << endl;
  cin >> flag;