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实验一、DES实验报告实验目的：熟悉DES加密算法，熟悉加密体制的概念，了解加密算法的使用。2、实验原理DES加密是对称加密机制中的一种方式，是单钥算法，是一种按分组方式工作的加密方式，是两种基本的加密组块替代和换位的结构。它通过反复依次应用这两项技术来提高强度，经过16轮的替代和换位的变换，使得其他人无法获得该算法一般特性以外更多的信息。3、实验环境：PC机一台4、实验步骤对设计好的程序结构和数据结构，在相应的平台下进行实现，对程序进行调试。代码：#includedes.h#includestdio.h#includestring.h#includememory.hvoidmain(){charkey[8],buf[255],str[100];printf(请输入明文：);scanf(%s,&str);memset(buf,0,sizeof(buf));strcpy(buf,str);printf(明文：);puts(buf);printf(请输入密钥：);scanf(%s,&key);Des_Go(buf,buf,sizeof(str),key,sizeof(key),jiami);puts(\n用密钥加密后：);puts(buf);Des_Go(buf,buf,sizeof(str),key,sizeof(key),jiemi);puts(\n解密后：);puts(buf);//getchar();}#includememory.h#includedes.h//////////////////////////////////////////////////////////////////////////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};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};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};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};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};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};conststaticcharLOOP_Table[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};conststaticcharS_Box[8][4][16]={//S114,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8,4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0,15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13,//S215,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5,0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15,13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9,//S310,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12,//S47,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14,//S52,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6,4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3,//S612,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13,//S74,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12,//S813,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11};//////////////////////////////////////////////////////////////////////////typedefbool(*PSubKey)[16][48];//////////////////////////////////////////////////////////////////////////staticvoidDES(charOut[8],charIn[8],constPSubKeypSubKey,boolType);//标准DES加/解密staticvoidSetKey(constchar*Key,intlen);//设置密钥staticvoidSetSubKey(PSubKeypSubKey,constcharKey[8]);//设置子密钥staticvoidF_func(boolIn[32],constboolKi[48]);//f函数staticvoidS_func(boolOut[32],constboolIn[48]);//S盒代替staticvoidTransform(bool*Out,bool*In,constchar*Table,intlen);//变换staticvoidXor(bool*InA,constbool*InB,intlen);//异或staticvoidRotateL(bool*In,intlen,intloop);//循环左移staticvoidByteToBit(bool*Out,constchar*In,intbits);//字节组转换成位组staticvoidBitToByte(char*Out,constbool*In,intbits);//位组转换成字节组boolDes_Go(char*Out,char*In,longdatalen,constchar*Key,intkeylen,boolType){if(!(Out&&In&&Key&&(datalen=(datalen+7)&0xfffffff8)))returnfalse;SetKey(Key,keylen);//设置密钥if(!Is3DES){//1次DESfor(longi=0,j=datalen3;iDES(Out,In,&SubKey[0],Type);}else{//3次DES加密:加(key0)-解(key1)-加(key0)解密::解(key0)-加(key1)-解(key0)for(longi=0,j=datalen3;iDES(Out,In,&SubKey[0],Type);DES(Out,Out,&SubKey[1],!Type);DES(Out,Out,&SubKey[0],Type);}}returntrue;}voidSetKey(constchar*Key,intlen){memset(deskey,0,16);memcpy(deskey,Key,len16?16:len);SetSubKey(&SubKey[0],&deskey[0]);if(Is3DES=len8)Is3DES=(SetSubKey(&SubKey[1],&deskey[8]),true);elseIs3DES=false;}voidDES(charOut[8],charIn[8],constPSubKeypSubKey,boolType){staticboolM[64],tmp[32],*Li=&M[0],*Ri=&M[32];ByteToBit(M,In,64);Transform(M,M,IP_Table,64);if(Type==jiami){for(inti=0;i16;++i){memcpy(tmp,Ri,32);F_func(Ri,(*pSubKey)[i]);Xor(Ri,Li,32);memcpy(Li,tmp,32);}}else{for(inti=15;i=0;--i){memcpy(tmp,Li,32);F_func(Li,(*pSubKey)[i]);Xor(Li,Ri,32);memcpy(Ri,tmp,32);}}Transform(M,M,IPR_Table,64);BitToByte(Out,M,64);}voidSetSubKey(PSubKeypSubKey,constcharKey[8]){staticboolK[64],*KL=&K[0],*KR=&