cypt(c);
return0;
}
四、实验结果及分析
实验项目
名称
实验四、DES算法的实现
成绩
一、实验目的
通过实现DES算法,加深对DES算法的理解,同时学习组合密码常用的代换、移位等运算的实现。
二、实验内容
1)利用C\C++实现DES算法的加、解密运算。
三、实验步骤
定义头文件:
yxyDES.h
#ifndefyxyDESH
#defineyxyDESH
#include
#include
#include
#include
usingnamespacestd;
classyxyDES
{
public:
yxyDES();
~yxyDES();
voidInitializeKey(string);
voidEncryptData(string);
voidDecryptData(string);
voidEncryptAnyLength(string);
voidDecryptAnyLength(string);
voidSetCiphertext(char*value);
char*GetCiphertext();
voidSetPlaintext(char*value);
char*GetPlaintext();
char*GetCiphertextAnyLength();
char*GetPlaintextAnyLength();
private:
charSubKeys[16][48];
charszCiphertext[16];
charszPlaintext[8];
charszFCiphertextAnyLength[8192];
charszFPlaintextAnyLength[4096];
voidCreateSubKey(char*);
voidFunctionF(char*,char*,int);
voidInitialPermuteData(string,char*,bool);
voidExpansionR(char*,char*);
voidXOR(char*,char*,int,char*);
stringCompressFuncS(char*);
voidPermutationP(string,char*);
stringFillToEightBits(string);
voidCleanPlaintextMark();
stringHexCharToBinary(char);
stringHexIntToBinary(int);
stringBinaryToString(char*,int,bool);
intSingleCharToBinary(char);
charSingleBinaryToChar(int);
};
#endif
构造主文件:
#pragmahdrstop
#include"yxyDES.h"
//---------------------------------------------------------------------------
#pragmapackage(smart_init)
//permutedchoicetable(PC1)
conststaticintPC1_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(PC2)
conststaticintPC2_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
conststaticintShift_Table[16]={
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
//initialpermutation(IP)
conststaticintIP_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
};
//expansionoperationmatrix(E)
staticconstintE_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
};
//The(in)famousS-boxes
conststaticintS_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,