DES加密算法C语言 实验报告材料

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1、实用标准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#in

2、clude#include#include"table.h"/*Constant*/#defineENCRYPT_LENGTH8//lengthofeachunitinencryption#defineDECIPHER_LENGTH4//lengthofeachunitindecipher#defineMAX320xFFFFFFFF//maskof32bits/*Declaration*/文档大全实用标准typedefunsignedlonglongbit64;ty

3、pedefunsignedlonglongbit56;typedefunsignedlonglongbit48;typedefunsignedintbit32;typedefunsignedintbit28;/*Filestream*/FILE*fin,*fout;/*Fordebug*/inlinevoidprintBite(bit64num){while(num){printf("%d",num%2);num>>=1;}printf("");}/*TransferfromchartobitinE

4、ncrtption*/inlinebit64ToBit(char*in//sourcestring);/*TransferfromchartobitinDeciphtering*/inlinebit64DeToBit(char*in//sourcestring文档大全实用标准);/*Transferfrombittochar*/inlinevoidToBite(char*out,//outstringbit64num//sourcebits);/*Permutation*/inlinebit64subs

5、titute(bit64num,//sourcebitsconstint*table,//Permutationtablesize_tlen//bitslength);/*Bitrecyclelooptoleft*/inlinebit28MoveLeft(bit28key,//sourcebitsintlen//bitslength);/*Bitrecyclelooptoright*/inlinebit28MoveRight(bit28key,//sourcebitsintlen//bitslength

6、);/*Dividebitsintotwoparts*/文档大全实用标准inlinevoiddivide(bit64num,//sourcebitsintlen,//lengthofeachbitsbit32*L,//leftoutbitsbit32*R//rightoutbits);/*Sbox*/inlinebit32SChange(bit48num//sourcebits);/*Fbox*/inlinebit32FChange(bit32num,//sourcebitsbit48key//secr

7、etkey);/*Keyinitialization*/inlinevoidSetKey(char*in//stringofkey);/*Enryption*/inlinevoidDES(char*message//messagestobeencrypted);文档大全实用标准/*Deciphering*/inlinevoidDecipher(char*message//messagestobedeciphered);/*Initialization*/inlinevoidinit();intmain(

8、){init();system("pause");return0;}/*Initialization*/inlinevoidinit(){/*Setsecretkey*/printf("Pleaseinputyoursecretkey(8digits):");charkey[10000];scanf("%s",key);if(strlen(key)!=8){printf("ERRORKey");return;}SetKey(key)