DES加密算法C语言 实验报告

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1、DES实验报告一、实验目的实现DES算法。二、实验过程按照DES的算法流程设计，具体实施详见附件。三、使用方法首先输入密钥，八位ASCII长，否则报错。然后输入读入文件名和写入文件名，必须以ASCII编码，否则不能使用。四、实验结果将自身cpp文件进行加密解密，前后文件完全一样。见文件附录源代码：//滴一欸死.cpp:定义控制台应用程序的入口点。//#include"stdafx.h"#include#include#include#include#include#include"tabl

2、e.h"/*Constant*/#defineENCRYPT_LENGTH8//lengthofeachunitinencryption#defineDECIPHER_LENGTH4//lengthofeachunitindecipher#defineMAX320xFFFFFFFF//maskof32bits/*Declaration*/typedefunsignedlonglongbit64;typedefunsignedlonglongbit56;typedefunsignedlonglongbit48;typedefunsignedintbit32;typedefunsigne

3、dintbit28;/*Filestream*/FILE*fin,*fout;/*Fordebug*/inlinevoidprintBite(bit64num){while(num){printf("%d",num%2);num>>=1;}printf("");}/*TransferfromchartobitinEncrtption*/inlinebit64ToBit(char*in//sourcestring);/*TransferfromchartobitinDeciphtering*/inlinebit64DeToBit(char*in//sourcestring);/*T

4、ransferfrombittochar*/inlinevoidToBite(char*out,//outstringbit64num//sourcebits);/*Permutation*/inlinebit64substitute(bit64num,//sourcebitsconstint*table,//Permutationtablesize_tlen//bitslength);/*Bitrecyclelooptoleft*/inlinebit28MoveLeft(bit28key,//sourcebitsintlen//bitslength);/*Bitrecycleloo

5、ptoright*/inlinebit28MoveRight(bit28key,//sourcebitsintlen//bitslength);/*Dividebitsintotwoparts*/inlinevoiddivide(bit64num,//sourcebitsintlen,//lengthofeachbitsbit32*L,//leftoutbitsbit32*R//rightoutbits);/*Sbox*/inlinebit32SChange(bit48num//sourcebits);/*Fbox*/inlinebit32FChange(bit32num,//sou

6、rcebitsbit48key//secretkey);/*Keyinitialization*/inlinevoidSetKey(char*in//stringofkey);/*Enryption*/inlinevoidDES(char*message//messagestobeencrypted);/*Deciphering*/inlinevoidDecipher(char*message//messagestobedeciphered);/*Initialization*/inlinevoidinit();intmain(){init();system("pause");ret

7、urn0;}/*Initialization*/inlinevoidinit(){/*Setsecretkey*/printf("Pleaseinputyoursecretkey(8digits):");charkey[10000];scanf("%s",key);if(strlen(key)!=8){printf("ERRORKey");return;}SetKey(key);/*SetmodeEncryptionorDeciphering*/p