用DES算法对图片进行加密解密.docx

用DES算法对图片进行加密解密.docx

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用DES算法对图片进行加密解密

用DES算法对图片进行加密解密

//main.cpp

#include"DES.h"

#include

#include

#include

usingnamespacestd;

voidEncrypt_Mode（void）;

voidTest_Mode（void）;

intmain（）

{

intchoose;

cout<<"\t\t\t####S-BOXDesign####"<

cout<<"1.UseStandardS-Box\n2.UseRandomS-Box\n3.UseLinearityS-

Box\n4.MyDesignS-Box"<

cout<<"YourChoose:

";

cin>>choose;

if（（choose!

=1）&&（choose!

=2）&&（choose!

=3）&&（choose!

=4））

{

cout<<"ErrorChoose!

"<

return1;

}

system（"cls"）;

switch（choose）

{

case1:

break;

case2:

GetRandSBox（）;

break;

case3:

GetLineSBox（）;

break;

case4:

MySBox（）;

break;

}

cout<<"\t\t\t####DESEncryptSystem####"<

cout<<"1.EncryptMode\n2.TestMode"<

cout<<"YourChoose:

";

cin>>choose;

system（"cls"）;

switch（choose）

{

case1:

Encrypt_Mode（）;

break;

case2:

Test_Mode（）;

break;

default:

cout<<"ErrorChoose!

"<

}

return0;

}

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

voidEncrypt_Mode（）

{

uvar32FileSize,Offset,DataSize;

charIV[]="wangyao";

charkey[8]={1,9,8,7,0,3,1,4};

charplaint[8]={0},crypt[8]={0};

//stringHeader;

charHeader[HEAD_LEN];

ifstreamfin;

ofstreamfout;

intchoose;

while（true）

{

cout<<"\t\t\tDESEncryptBMPFileSystem"<

cout<<"\n1.EBCENCRYPT\n2.EBCDECRYPT\n3.CBCENCRYPT\n4.CBC

DECRYPT\n5.Exit"<

cout<<"YourChoose:

";

cin>>choose;

if（choose==5）

break;

elseif（（choose!

=1）&&（choose!

=2）&&（choose!

=3）&&（choose!

=4））

{

cout<<"WrongChoose!

"<

break;

}

cout<<"Enterthefile'sname:

";

stringfilename;

cin>>filename;

ifstreamfin（filename.c_str（）,ios:

:

binary）;

stringoutfilename=filename;

outfilename="out_"+outfilename;

ofstreamfout（outfilename.c_str（）,ios:

:

binary）;

if（!

fin||!

fout）

{

cout<<"OpenFileError!

"<

return;

}

fin.seekg

（2）;//Skip"BM"（theheadoftheBMPfile）

fin.read（（char*）&FileSize,sizeof（uvar32））;//GettheBMPFileSize

fin.seekg（sizeof（uvar32）,ios_base:

:

cur）;//SkiptheReservedField

fin.read（（char*）&Offset,sizeof（uvar32））;//GettheOffsetoftheRealSize

DataSize=FileSize-Offset;//GettheDataSize;Alsocanbedoneby"DataSize"

FieldintheHeader

//SettheKey

Des_SetKey（key）;

//CopytheHeadertoencryptfile

fin.seekg（ios:

:

beg）;

fin.read（Header,Offset）;

fout.write（Header,Offset）;

memcpy（crypt,IV,8）;//GettheIVkey

//DoDESEncrypt

for（inti=0;i

{

fin.read（plaint,8）;

switch（choose）

{

case1:

//ECBDESENCRYPT

ECB_Des_Run（crypt,plaint,ENCRYPT）;

fout.write（crypt,8）;

break;

case2:

//ECBDESDECRYPT

ECB_Des_Run（crypt,plaint,DECRYPT）;

fout.write（crypt,8）;

break;

case3:

//CBCDESENCRYPT

CBC_Des_Run（crypt,plaint,ENCRYPT）;

fout.write（crypt,8）;

break;

case4:

//CBCDESDECRYPT

CBC_Des_Run（crypt,plaint,DECRYPT）;

fout.write（crypt,8）;

memcpy（crypt,plaint,8）;//GettheIVkey

}

}

system（"cls"）;

}

fin.close（）;

fout.close（）;

system（"pause"）;

}

voidTest_Mode（）

{

boolPlaintBits1[64]={0},PlaintBits2[64]={0};//Snowslip_Test

boolPlaintBits[PLAINT_SIZE][64];//Completeness_Test

intchoose;

while（true）

{

cout<<"\t\t\t####DESTestMode####"<

cout<<"1.SnowslipTest\n2.CompletenessTest\n3.DifferentialCryptanalysis

Test\n4.Exit"<

cout<<"YourChoose:

";

cin>>choose;

if（choose==4）

break;

switch（choose）

{

case1:

//Snowslip_Test

GetRandPlaint_Snowslip（PlaintBits1,PlaintBits2）;

Snowslip_Test（PlaintBits1,PlaintBits2）;

break;

case2:

//Completeness_Test

GetRandPlaint_Complete（PlaintBits）;

Completeness_Test（PlaintBits）;

break;

case3:

Differential_Analysis（）;

break;

default:

cout<<"ErrorChoose!

"<

}

system（"pause"）;

system（"cls"）;

}

}

//~main.cpp

以下为des的代码:

//DES.cpp

#include

#include

#include

#include

#include"DES.h"

usingnamespacestd;

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

//initialpermutationIP

conststaticcharIP_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

};

//finalpermutationIP^-1

conststaticcharIPR_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

};

//expansionoperationmatrix

staticconstcharE_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-bitpermutationfunctionPusedontheoutputoftheS-boxes

conststaticcharP_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

};

//permutedchoicetable（key）

conststaticcharPC1_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

};

//permutedchoicekey（table）

conststaticcharPC2_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

};

//numberleftrotationsofpc1

conststaticcharLOOP_Table[16]={

1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1

};

//externcharS_Box[8][4][16];

//The（in）famousS-boxes

//conststaticcharS_Box[8][4][16]={

staticcharS_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

};

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

staticboolSubKey[16][48];//16圈子密钥

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

voidECB_Des_Run（charOut[8],charIn[8],boolType）

{

staticboolM[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（inti=0;i<16;i++）{

memcpy（Tmp,Ri,32）;

F_func（Ri,SubKey[i]）;

Xor（Ri,Li,32）;

memcpy（Li,Tmp,32）;

}

}else{

for（inti=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）;

}

voidCBC_Des_Run（charOut[8],charIn[8],boolType）

{

staticboolM[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（inti=0;i<16;i++）{

memcpy（Tmp,Ri,32）;

F_func（Ri,SubKey[i]）;

Xor（Ri,Li,32）;

memcpy（Li,Tmp,32）;

}

}else{

for（inti=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）;

}

voidDes_SetKey（constcharKey[8]）

{

staticboolK[64],*KL=&K[0],*KR=&K[28];

ByteToBit（K,Key,64）;

//PC1Transform

Transform（K,K,PC1_Table,56）;

for（inti=0;i<16;i++）{

RotateL（KL,28,LOOP_Table[i]）;//Leftshiftcircle

RotateL（KR,28,LOOP_Table[i]）;

//PC2Transform

Transform（SubKey[i],K,PC2_Table,48）;

}

}

//ARoundofDES

voidF_func（boolIn[32],constboolKi[48]）

{

staticboolMR[48];

//ETransform

Transform（MR,In,E_Table,48）;

Xor（MR,Ki,48）;

S_func（In,MR）;//SBOX

//PTransform

Tr