用DES算法对图片进行加密解密

//main.cpp
#include "DES.h"
#include
#include
#include
using namespace std;

void Encrypt_Mode(void);
void Test_Mode(void);

int main()
{
int choose;

cout<<"\t\t\t#### S-BOX Design ####"<cout<<"e Standard S-Box\e Random S-Box\e Linearity S-Box\n4.My Design S-Box"<cout<<"Your Choose: ";
cin>>choose;

if( (choose != 1) && (choose != 2) && (choose != 3) && (choose != 4) )
{
cout<<"Error Choose!"<return 1;
}
system("cls");

switch(choose)
{
case 1:
break;
case 2:
GetRandSBox();
break;
case 3:
GetLineSBox();
break;
case 4:
MySBox();
break;
}

cout<<"\t\t\t#### DES Encrypt System ####"<cout<<"1.Encrypt Mode\n2.Test Mode"<cout<<"Your Choose: ";
cin>>choose;

system("cls");

switch(choose)
{
case 1:
Encrypt_Mode();
break;
case 2:
Test_Mode();
break;
default:
cout<<"Error Choose!"<}

return 0;
}

////////////////////////////////////////////////////////////////////////////////////
void Encrypt_Mode()
{
uvar32 FileSize,Offset,DataSize;

char IV[]="wang yao";
char key[8]={1,9,8,7,0,3,1,4};
char plaint[8]={0},crypt[8]={0};
//string Header;
char Header[HEAD_LEN];

ifstream fin;
ofstream fout;

int choose;
while(true)
{
cout<<"\t\t\tDES Encrypt BMP File System"<cout<<"\n1.EBC ENCRYPT\n2.EBC DECRYPT\n3.CBC ENCRYPT\n4.CBC DECRYPT\n5.Exit"<cout<<"Your Choose: ";

cin>>choose;

if(choose == 5)
break;
else if( (choose != 1) && (choose != 2) && (choose != 3) && (choose != 4) )
{
cout<<"Wrong Choose!"<break;
}

cout << "Enter the file's name: ";
string filename;
cin >> filename;

ifstream fin(filename.c_str(),ios::binary);
string outfilename = filename;
outfilename = "out_" + outfilename;
ofstream fout(outfilename.c_str(),ios::binary);

if(!fin || !fout)
{
cout<<"Open File Error!"<return;
}

fin.seekg(2); //Skip "BM"(the head of the BMP file)
fin.read((char*)&FileSize ,sizeof(uvar32)); //Get the BMP File Size

fin.seekg(sizeof(uvar32),ios_base::cur); //Skip the Reserved Field
fin.read((char*)&Offset ,sizeof(uvar32)); //Get the Offset of the Real Size

DataSize = FileSize - Offset; //Get the Data Size;Also can be done by "DataSize" Field in the Header

//Set the Key
Des_SetKey(

key);

//Copy the Header to encrypt file
fin.seekg(ios::beg);
fin.read(Header,Offset);
fout.write(Header,Offset);

memcpy(crypt,IV,8); //Get the IV key
//Do DES Encrypt
for(int i=0;i < DataSize/8;i++)
{
fin.read(plaint,8);

switch(choose)
{
case 1: //ECB DES ENCRYPT
ECB_Des_Run(crypt,plaint, ENCRYPT);
fout.write(crypt,8);
break;
case 2: //ECB DES DECRYPT
ECB_Des_Run(crypt,plaint, DECRYPT);
fout.write(crypt,8);
break;
case 3: //CBC DES ENCRYPT
CBC_Des_Run(crypt,plaint, ENCRYPT);
fout.write(crypt,8);
break;
case 4: //CBC DES DECRYPT
CBC_Des_Run(crypt,plaint, DECRYPT);
fout.write(crypt,8);
memcpy(crypt,plaint,8); //Get the IV key
}
}

system("cls");
}

fin.close();
fout.close();

system("pause");

}

void Test_Mode()
{
bool PlaintBits1[64]={0},PlaintBits2[64]={0}; //Snowslip_Test
bool PlaintBits[PLAINT_SIZE][64]; //Completeness_Test
int choose;

while (true)
{
cout<<"\t\t\t#### DES Test Mode ####"<cout<<"1.Snowslip Test\pleteness Test\n3.Differential Cryptanalysis Test\n4.Exit"<cout<<"Your Choose: ";
cin>>choose;

if (choose == 4)
break;

switch(choose)
{
case 1:
//Snowslip_Test
GetRandPlaint_Snowslip(PlaintBits1,PlaintBits2);
Snowslip_Test(PlaintBits1,PlaintBits2);
break;
case 2:
//Completeness_Test
GetRandPlaint_Complete(PlaintBits);
Completeness_Test(PlaintBits);
break;
case 3:
Differential_Analysis();
break;
default:
cout<<"Error Choose!"<}

system("pause");
system("cls");
}

}
//~main.cpp




以下为des的代码：
//DES.cpp
#include
#include
#include
#include
#include "DES.h"
using namespace std;

////////////////////////////////////////////////////////////////////
// initial permutation IP
const static 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
};
// final permutation IP^-1
const static 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
};
// expansion operation matrix
static 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
};
// 32-bit permutation function P used on the output of the S-boxes
const static 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
};
// permuted choice table (key)
const static 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
};
// permuted choice key (table)
const static 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
};
// number left rotations of pc1
const static char LOOP_Table[16] = {
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};

//extern char S_Box[8][4][16];
// The (in)famous S-boxes
//const static char S_Box[8][4][16] = {
static 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
};

//////////////////////////////////////////////////////////////////////////

static bool SubKey[16][48];// 16圈子密钥

//////////////////////////////////////////////////////////////////////////
void ECB_Des_Run(char Out[8], char In[8], bool Type)
{
static bool M[64], Tmp[32], *Li = &M[0], *Ri = &M[32];
ByteToBit(M, In, 64);
Transform(M, M, IP_Table, 64);
if( Type == ENCRYPT ){
//fk(L,R) = (L^F(R,SK),R)
for(int i=0; i<16; i++) {
memcpy(Tmp, Ri, 32);
F_func(Ri, SubKey[i]);
Xor(Ri, Li, 32);
memcpy(Li, Tmp, 32);
}
}else{
for(int i=15; i>=0; i--) {
memcpy(Tmp, Li, 32);
F_func(Li, SubKey[i]);
Xor(Li, Ri, 32);
memcpy(Ri, Tmp, 32);
}
}
Transform(M, M, IPR_Table, 64);
BitToByte(Out, M, 64);
}

void CBC_Des_Run(char Out[8], char In[8], bool Type)
{
static bool M[64],N[64], Tmp[32], *Li = &M[0], *Ri = &M[32];
ByteToBit(M, In, 64);
ByteToBit(N, Out, 64);
if (Type == ENCRYPT)
Xor(M,N, 64);

Transform(M, M, IP_Table, 64);
if( Type == ENCRYPT ){
//fk(L,R) = (L^F(R,SK),R)
for(int i=0; i<16; i++) {
memcpy(Tmp, Ri, 32);
F_func(Ri, SubKey[i]);
Xor(Ri, Li, 32);
memcpy(Li, Tmp, 32);
}
}else{
for(int i=15; i>=0; i--) {
memcpy(Tmp, Li, 32);
F_func(Li, SubKey[i]);
Xor(Li, Ri, 32);
memcpy(Ri, Tmp, 32);
}
}
Transform(M, M, IPR_Table, 64);

if(Type == DECRYPT)
Xor(M,N, 64);

BitToByte(Out, M, 64);
//BitToByte(In, N, 64);
}

void Des_SetKey(const char Key[8])
{
static bool K[64], *KL = &K[0], *KR = &K[28];
ByteToBit(K, Key, 64);
//PC1 Transform
Transform(K, K, PC1_Table, 56

);
for(int i=0; i<16; i++) {
RotateL(KL, 28, LOOP_Table[i]); //Left shift circle
RotateL(KR, 28, LOOP_Table[i]);
//PC2 Transform
Transform(SubKey[i], K, PC2_Table, 48);
}
}

//A Round of DES
void F_func(bool In[32], const bool Ki[48])
{
static bool MR[48];
//E Transform
Transform(MR, In, E_Table, 48);
Xor(MR, Ki, 48);
S_func(In, MR); //S BOX
//P Transform
Transform(In, In, P_Table, 32);
}

//S BOX
/*
void S_func(bool Out[32], const bool In[48])
{
//i<8 <==> 8's S-BOX;In(6)==>Out(4)
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];
ByteToBit(Out, &S_Box[i][j][k], 4);
}
}
*/

void S_func(bool Out[32], const bool In[48])
{
//i<8 <==> 8's S-BOX;In(6)==>Out(4)
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];
ByteToBit(Out, &S_Box[i][j][k], 4);
}
}

//Trabsform through TABLE
void Transform(bool *Out, bool *In, const char *Table, int len)
{
static bool Tmp[256];
for(int i=0; iTmp[i] = In[ Table[i]-1 ];
memcpy(Out, Tmp, len);
}
void Xor(bool *InA, const bool *InB, int len)
{
for(int i=0; iInA[i] ^= InB[i];
}
void RotateL(bool *In, int len, int loop)
{
static bool Tmp[256];
//Store the first (loop) bits to Tmp
memcpy(Tmp, In, loop);
//Copy the end of

the (len-loop) bits to the front of In
memcpy(In, In+loop, len-loop);
//Move the Stored (loop) bits to the end of Nes In
memcpy(In+len-loop, Tmp, loop);
}
void ByteToBit(bool *Out, const char *In, int bits)
{
for(int i=0; iOut[i] = (In[i/8]>>(i%8)) & 1;
//Get the last of the Byte
}
void BitToByte(char *Out, const bool *In, int bits)
{
memset(Out, 0, (bits+7)/8);
for(int i=0; iOut[i/8] |= In[i]<<(i%8);
}


void GetRandSBox()
{
int Temp[16]={0},MaxIndex=15;

for(int i=0;i<16;i++)
Temp[i] = i;

// int Mark[16]={0};
srand((unsigned)time(NULL));

for(int i = 0;i<8;i++)
{
for(int j=0;j<4;j++)
{
//RandBOX(S_Box[i][j]);
for(int k=0;k<16;k++)
{
int temp = rand()%(MaxIndex+1);
S_Box[i][j][k] = Temp[temp];

if (MaxIndex > temp)
Temp[temp] = Temp[MaxIndex];

MaxIndex--;
// cout<}
MaxIndex = 15;
for(int l=0;l<16;l++)
Temp[l] = l;
}
}
}
/*
void GetRandSBox()
{
int Mark[16]={0};
srand((unsigned)time(NULL));

for(int i = 0;i<8;i++)
for(int j=0;j<4;j++)
{
//RandBOX(S_Box[i][j]);
for(int k=0;k<16;k++)
{
GETRAND:
int temp = rand()%16;
if(Mark[temp] == 0)
{
S_Box[i][j][temp] = k;
//cout<Mark[temp] = 1;
}
else
goto GETRAND;
}
//Reset the Mark
for (int k=0;k<16;k++)
Mark[k] = 0;
}
}

*/
//Input:(a,b,c,d,e,f)
//Output:(b,c,d,e)
//(a,b,c,d,e,f)==>(b,c,d,e)
//Also can be: (a,b,c,d,e,f)==>(b,c,a^d,e^f)
void GetLineSBox(void)
{
for(int j=0;j<4;j++)
//RandBOX(S_Box[i][j]);
for(int k=0;k<16;k++)
for(int i = 0;i<8;i++)
S_Box[i][

j][k] = k;
}

//Input:(a,b,c,d,e,f)
//Output:(q,r,s,t)
// q=abcd^00ef
// r=abef^00cd
// s=cdef^00ab
// t=cdab^ef00
void MySBox(void)
{

}
//////////////////////////////////////////////////////////////////////////
//Test Mode Method
void Snowslip_Test(bool Plaint1[64],bool Plaint2[64])
{
static bool Tmp[32], *Li1 = &Plaint1[0], *Ri1 = &Plaint1[32];
static bool *Li2 = &Plaint2[0], *Ri2 = &Plaint2[32];

//ByteToBit(M, In, 64);
//Transform(M, M, IP_Table, 64);

//fk(L,R) = (L^F(R,SK),R)
for(int i=0; i<16; i++) {
memcpy(Tmp, Ri1, 32);
F_func(Ri1, SubKey[i]);
Xor(Ri1, Li1, 32);
memcpy(Li1, Tmp, 32);

memcpy(Tmp, Ri2, 32);
F_func(Ri2, SubKey[i]);
Xor(Ri2, Li2, 32);
memcpy(Li2, Tmp, 32);

int count = 0;
for (int j=0;j<64;j++)
if (Plaint1[j] != Plaint2[j])
count++;

//cout<<"The "<cout<<"The "<}
}

void Completeness_Test(bool Text[PLAINT_SIZE][64])
{
static bool Tmp[32], *Li , *Ri;
int count[64][2]={0};

//ByteToBit(M, In, 64);
//Transform(M, M, IP_Table, 64);

for(int i=0;i{
Li = &Text[i][0];
Ri = &Text[i][32];
//fk(L,R) = (L^F(R,SK),R)
for(int j=0; j<16; j++)
{
memcpy(Tmp, Ri, 32);
F_func(Ri, SubKey[i]);
Xor(Ri, Li, 32);
memcpy(Li, Tmp, 32);
}

for (int k = 0;k < 64;k++)
{
if (Text[i][k] == 0)
count[k][0]++;
else
count[k][1]++;
}
}

//Get the frequency
cout<<"Every bit is 0's frequency: "<for (int i=0;i<64;i++)
cout<<"The "<}

void GetRandPlaint_Snowslip(bool PlaintBits1[64],bool PlaintBits2[64])
{
// char Out1[8]={0},Out2[8]={0};
//static bool PlaintBits1[64],PlaintBits2[64];

srand((unsigned)time(NULL));
int tempindex = rand()%64;
int tempvalue = rand()%2;

PlaintBits1[tempindex] = tempvalue;
PlaintBits2[tempindex] = tempvalue ^1;

for(int i = 0;i<64;i++)
if (i != tempindex)
{
tempvalue = rand()%2;
PlaintBits1[i] = tempvalue;
PlaintBits2[i] = tempvalue;
}
}

void GetRandPlaint_Complete(bool PlaintBits[PLAINT_SIZE][64])
{
srand((unsigned)time(NULL));
int tempindex = rand()%64;
int tempvalue1 = rand()%2;

for (int i=0;i{

PlaintBits[i][tempindex] = tempvalue1;
for(int j = 0;j<64;j++)
if (j != tempindex)
{
int tempvalue2 = rand()%2;
PlaintBits[i][j] = tempvalue2;
}
}
}

void Differential_Analysis(void)
{
int count[8][64][16]={0};//Used count the Differential Distributing

for (int i = 0;i<8;i++)
{
cout<<"The "<for (int l=0;l<16;l++)
cout<<" "<cout<
for (int j = 0;j<64;j++)
{
bool In[6]={0};
int2bin(j,In,6);
for (int k=0;k<64;k++)
{
bool In1[6]={0},In2[6]={0},Out1[4]={0},Out2[4]={0};
int2bin(k,In1,6);
S_Box_single(In1,Out1,i);
int2bin(j^k,In2,6); // Xor(In,In1,6);
S_Box_single(In2,Out2,i);

Xor(Out1,Out2,4); //Out1 <== Out1 ^ Out2 (Out == Out1)
count[i][j][bin2int(Out1,4)] ++;
}
cout<for (int l=0;l<16;l++)
cout<cout<}
cout<system("pause");
}
}

void S_Box_single(bool In[6],bool Out[4],int num)
{
int Line = 2*In[0] + In[5];
int Row = 8*In[1]+4*In[2]+2*In[3]+In[4];

int2bin(S_Box[num][Line][Row],Out,4);
}
void int2bin(int var,bool *bin,int bin_size)
{
char temp = (unsigned char)var;

for(int i=0;i{
bin[i] = temp & 0x01;
temp >>= 1;
}
}

int bin2int(bool bin[],int bin_size)
{
int var = 0;

for(int i=0;ivar = 2*var + bin[bin_size-1-i];

return var;
}