C语言的DES和3DES算法,能真正运行。

Linux下c语言实现DES和3DES算法(2010-12-0920:56:21)转载标签：linuxcdes3des加解密对称算法it分类：IT技术一、DES算法理论DES算法属于对称加密算法，在一些对安全性要求较高的交易中运用广泛，如支付行业等。关于DES算法的理论，网上有很多文章都有详细的讲解，写得很好，我这里不再赘述，这里给出链接：=623，请朋友们自己去学习，我的代码也是依据这里的理论写的。二、实现环境及文件a、环境：RedhatLinux+cb、实现文件：des.hdes.cmakefile三、代码1、des.h文件//功能：实现DES及3DES加解密的算法//作者：XXX//日期：2008-9-23#ifndefDES_H#defineDES_Hstaticintpc_1_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};staticintpc_2_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};staticintls_num_table[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};staticintip_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};staticintip_1_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};staticinte_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};staticintp_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};staticints_box_table[8][4][16]={{{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}},{{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}},{{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}},{{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}},{{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}},{{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}},{{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}},{{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}}};//函数声明intDo_DES(char*strSrc,char*strKey,char*strDest,charflag);#endif2、des.c文件//功能：实现DES及3DES加解密的算法//作者：XXX//日期：2008-9-23#includestdio.h#includestdlib.h#includestring.h#includedes.h//函数声明intDo_DES(char*strSrc,char*strKey,char*strDest,charflag);intDo_3DES(char*strSrc,char*strKey,char*strDest,charflag);//主函数intmain(intargc,char**argv){charsrc16[16+1],key16[16+1],key48[48+1],dest16[16+1];if(argc!=3){fprintf(stderr,Usage:[%s-e|-ds|3]\n,argv[0]);exit(1);}if(strcmp(argv[2],-s)==0){if(strcmp(argv[1],-e)==0){fprintf(stderr,Pleaseinputthestringthatyouwanttoencrypt(16hexnumber):\n);memset(src16,0,sizeof(src16));scanf(%s,src16);fprintf(stderr,PleaseinputtheKeystring(16hexnumber):\n);memset(key16,0,sizeof(key16));scanf(%s,key16);memset(dest16,0,sizeof(dest16));Do_DES(src16,key16,dest16,'e');fprintf(stderr,Result:[%s]\n,dest16);}elseif(strcmp(argv[1],-d)==0){fprintf(stderr,Pleaseinputthestringthatyouwanttodecrypt(16hexnumber):\n);memset(src16,0,sizeof(src16));scanf(%s,src16);fprintf(stderr,PleaseinputtheKeystring(16hexnumber):\n);memset(key16,0,sizeof(key16));scanf(%s,key16);memset(dest16,0,sizeof(dest16));Do_DES(src16,key16,dest16,'d');fprintf(stderr,Result:[%s]\n,dest16);}elsereturn-1;}elseif(strcmp(argv[2],-3)==0){if(strcmp(argv[1],-e)==0){fprintf(stderr,Pleaseinputthestringthatyouwanttoencrypt(16hexnumber):\n);memset(src16,0,sizeof(src16));scanf(%s,src16);fprintf(stderr,PleaseinputtheKeystring(16hexnumber):\n);memset(key48,0,sizeof(key48));scanf(%s,key48);memset(dest16,0,sizeof(dest16));Do_3DES(src16,key48,dest16,'e');fprintf(stderr,Result:[%s]\n,dest16);}elseif(strcmp(argv[1],-d)==0){fprintf(stderr,Pleaseinputthestringthatyouwanttodecrypt(16hexnumber):\n);memset(src16,0,sizeof(src16));scanf(%s,src16);fprintf(stderr,PleaseinputtheKeystring(16hexnumber):\n);memset(key48,0,sizeof(key48));scanf(%s,key48);memset(dest16,0,sizeof(dest16));Do_3DES(src16,key48,dest16,'d');fprintf(stderr,Result:[%s]\n,dest16);}elsereturn-1;}elsereturn-1;return0;}//做DES加密或解密运算intDo_DES(char*strSrc,char*strKey,char*strDest,charflag){inti,j;unsignedcharsubKey[16][48+1],byte8[8+1],bits[64+1],strTmp[64+1];unsignedcharL0[32+1],R0[32+1],Lx[32+1],Rx[32+1];if(!(flag=='e'||flag=='E'||flag=='d'||flag=='D'))r