46南昌大学计算机网络安全实验报告

-1-实验报告实验课程：计算机网络安全学生姓名：信念学号：1314LOVE专业班级：网络间谍088-2-目录一、实验一………………………………………………………3二、实验二………………………………………………………11三、实验三………………………………………………………23四、实验四………………………………………………………27-3-南昌大学实验报告一学生姓名：信念学号：1314LOVE专业班级：网络间谍088班实验类型：▥验证□综合□设计□创新实验日期:实验成绩：一、实验名称DES算法的实现二、实验目的通过用DES算法对实际的数据进行加密和解密来深刻了解DES的运行原理。三、实验基本原理和内容1.DES算法详述DES算法把64位的明文输入块变为64位的密文输出块，它所使用的密钥也是64位,其功能是把输入的64位数据块按位重新组合，并把输出分为L0、R0两部分，每部分各长32位，其置换规则见下表：58,50,12,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6,64,56,48,40,32,24,16,8,57,49,41,33,25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7,即将输入的第58位换到第一位，第50位换到第2位，……，依此类推，最后一位是原来的第7位。L0、R0则是换位输出后的两部分，L0是输出的左32位，R0是右32位，例：设置换前的输入值为D1D2D3……D64，则经过初始置换后的结果为：L0=D550……D8；R0=D57D49...D7。经过26次迭代运算后，得到L16、R16，将此作为输入，进行逆置换，即得到密文输出。逆置换正好是初始置的逆运算，例如，第1位经过初始置换后，处于第40位，而通过逆置换，又将第40位换回到第1位，其逆置换规则如下表所示：40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,5826,33,1,41,9,49,17,57,25,放大换位表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,单纯换位表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,在f（Ri,Ki）算法描述图中，S1,S2...S8为选择函数，其功能是把6bit数据变为4bit数据。下面给出选择函数Si（i=1,2......8）的功能表：选择函数Si-4-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,S2:15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5,0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15,13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9,S3:10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12,S4:7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14,S5:2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6,4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3,S6:12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13,S7:4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12,S8:13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11,四、主要仪器设备及耗材PC机一台五、实验步骤与结果1.运行程序2.加密过程（同时生成密文文档）3.解密过程（同时生成明文外部文档）-5-六、实验原代码//DES算法C++源代码：#includestdafx.h#includeDESTest.h#includeDESTestDlg.h#includeEncrypt.hvoidCDES::deskey（unsignedcharkey[8],Modemd）{registerintii,j,l,m,n;unsignedcharpc1m[56],pcr[56];unsignedlongkn[32];for（j=0;j56;j++）{l=pc1[j];m=l&07;pc1m[j]=（key[l3]&bytebit[m]）?1:0;}for（ii=0;ii16;ii++）{if（md==DECRYPT）m=（15-ii）1;elsem=ii1;n=m+1;kn[m]=kn[n]=0L;for（j=0;j28;j++）{l=j+totrot[ii];if（l28）pcr[j]=pc1m[l];elsepcr[j]=pc1m[l-28];}-6-for（j=28;j56;j++）{l=j+totrot[ii];if（l56）pcr[j]=pc1m[l];elsepcr[j]=pc1m[l-28];}for（j=0;j24;j++）{if（pcr[pc2[j]]）kn[m]|=bigbyte[j];if（pcr[pc2[j+24]]）kn[n]|=bigbyte[j];}}cookey（kn）;return;}voidCDES::cookey（registerunsignedlong*raw1）{registerunsignedlong*cook,*raw0;unsignedlongdough[32];registerinti;cook=dough;for（i=0;i16;i++,raw1++）{raw0=raw1++;*cook=（*raw0&0x00fc0000L）6;*cook|=（*raw0&0x00000fc0L）10;*cook|=（*raw1&0x00fc0000L）10;*cook++|=（*raw1&0x00000fc0L）6;*cook=（*raw0&0x0003f000L）12;*cook|=（*raw0&0x0000003fL）16;*cook|=（*raw1&0x0003f000L）4;*cook++|=（*raw1&0x0000003fL）;}usekey（dough）;return;-7-}voidCDES::usekey（registerunsignedlong*from）{registerunsignedlong*to,*endp;to=KnL,endp=&KnL[32];while（toendp）{*to++=*from++;}return;}voidCDES::scrunch（registerunsignedchar*outof,registerunsignedlong*into）{*into=（*outof++&0xffL）24;*into|=（*outof++&0xffL）16;*into|=（*outof++&0xffL）8;*into++|=（*outof++&0xffL）;*into=（*outof++&0xffL）24;*into|=（*outof++&0xffL）16;*into|=（*outof++&0xffL）8;*into|=（*outof&0xffL）;return;}voidCDES::unscrun（registerunsignedlong*outof,registerunsignedchar*into）{*into++=（*outof24）&0xffL;*into++=（*outof16）&0xffL;*into++=（*outof8）&0xffL;*into++=*outof++&0xffL;*into++=（*outof24）&0xffL;*into++=（*outof16）&0xffL;*into++=（*outof8）&0xffL;*into=*outof&0xffL;return;}voidCDES::desfunc（registerunsignedlong*block,registerunsignedlong*keys）{-8-registerunsignedlongfval,work,right,leftt;registerintround;leftt=block[0];right=block[1];work=（（leftt4）^right）&0x0f0f0f0fL;right^=work;leftt^=（work4）;work=（（leftt16）^right）&0x0000ffffL;right^=work;leftt^=（work16）;work=（（right2）^leftt）&0x33333333L;leftt^=work;right^=（work2）;work=（（right8）^leftt）&0x00ff00ffL;leftt^=work;right^=（work8）;right=（（right1）|（（right31）&1L））&0xffffffffL;work=（leftt^right）&0xaaaaaaaaL;leftt^=work;right^=work;leftt=（（leftt1）|（（leftt31）&1L））&0xffffffffL;for（round=0;ro