实验3 对称密码算法DES文档格式.docx

1、#define PLAIN_FILE_OPEN_ERROR -1 #define KEY_FILE_OPEN_ERROR -2 #define CIPHER_FILE_OPEN_ERROR -3 #define OK 1 typedef char ElemType; /初始置换表IP int IP_Table64 = 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, 56,48,40,32,24,16,8,0, 58,50,42,34,26,18,10,2

2、, 60,52,44,36,28,20,12,4, 62,54,46,38,30,22,14,6;/逆初始置换表IP-1 int IP_1_Table64 = 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, 32,0,40,8,48,16,56,24;/扩充置换表E 32-48int E_Table48 = 31

3、, 0, 1, 2, 3, 4, 3, 4, 5, 6, 7, 8, 7, 8,9,10,11,12, 11,12,13,14,15,16, 15,16,17,18,19,20, 19,20,21,22,23,24, 23,24,25,26,27,28, 27,28,29,30,31, 0;/置换函数P int P_Table32 = 15,6,19,20,28,11,27,16, 0,14,22,25,4,17,30,9, 1,7,23,13,31,26,2,8, 18,12,29,5,21,10,3,24;/S盒 int S8416 =/S1 14,4,13,1,2,15,11,8,3,1

4、0,6,12,5,9,0,7, 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,

5、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, 3,15,0,6,10,1,13,8,9,4,5,1

6、1,12,7,2,14, /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,

7、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

8、,13,15,3,5,8, 2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11;/置换选择1 int PC_156 = 56,48,40,32,24,16,8, 0,57,49,41,33,25,17, 9,1,58,50,42,34,26, 18,10,2,59,51,43,35, 62,54,46,38,30,22,14, 6,61,53,45,37,29,21, 13,5,60,52,44,36,28, 20,12,4,27,19,11,3;/置换选择2 int PC_248 = 13,16,10,23,0,4,2,27, 14,5,20,9,22,18,11,3

9、, 25,7,15,6,26,19,12,1, 40,51,30,36,46,54,29,39, 50,44,32,46,43,48,38,55, 33,52,45,41,49,35,28,31;/对左移次数的规定 int MOVE_TIMES16 = 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1;int ByteToBit（ElemType ch,ElemType bit8）;int BitToByte（ElemType bit8,ElemType *ch）;int Char8ToBit64（ElemType ch8,ElemType bit64）;int Bit64ToC

10、har8（ElemType bit64,ElemType ch8）;int DES_MakeSubKeys（ElemType key64,ElemType subKeys1648）;int DES_PC1_Transform（ElemType key64, ElemType tempbts56）;int DES_PC2_Transform（ElemType key56, ElemType tempbts48）;int DES_ROL（ElemType data56, int time）;int DES_IP_Transform（ElemType data64）;int DES_IP_1_Tra

11、nsform（ElemType data64）;int DES_E_Transform（ElemType data48）;int DES_P_Transform（ElemType data32）;int DES_SBOX（ElemType data48）;int DES_XOR（ElemType R48, ElemType L48,int count）; /异或操作int DES_Swap（ElemType left32,ElemType right32）; /交换 L分组与R分组交换.int DES_EncryptBlock（ElemType plainBlock8, ElemType su

12、bKeys1648, ElemType cipherBlock8）;int DES_DecryptBlock（ElemType cipherBlock8, ElemType subKeys1648, ElemType plainBlock8）;int DES_Encrypt（char *plainFile, char *keyStr,char *cipherFile）;int DES_Decrypt（char *cipherFile, char *keyStr,char *plainFile）;/字节转换成二进制int ByteToBit（ElemType ch, ElemType bit8）

13、 int cnt; for（cnt = 0;cnt cnt）&1; /右移cnt位,与1相与.将字节装入8位二进制数组中.倒序装入 /7=00000111,bit=11100000 /printf（%s,bit）; return 0; /二进制转换成字节 int BitToByte（ElemType bit8,ElemType *ch） *ch |= *（bit + cnt）cnt; / 为*（1）+*（10）+*（100）+0000+00000+0000000.=7 /将长度为8的字符串转为二进制位串 int Char8ToBit64（ElemType ch8,ElemType bit64）

14、 cnt ByteToBit（*（ch+cnt）,bit+（cnt3）; /cnt3即为cnt*8/将二进制位串转为长度为8的字符串 int Bit64ToChar8（ElemType bit64,ElemType ch8） memset（ch,0,8）; /以ch为起点的8位空间数组置0. BitToByte（bit+（cnt3）,ch+cnt）;/IP置换 int DES_IP_Transform（ElemType data64） ElemType temp64; 64; tempcnt = dataIP_Tablecnt; memcpy（data,temp,64）; /由temp所指内存

15、区域复制64个字节到data所指内存区域,与strcpy 同./IP逆置换 int DES_IP_1_Transform（ElemType data64） tempcnt = dataIP_1_Tablecnt; /由temp所指内存区域复制64个字节到data所指内存区域,与strcpy同/密钥置换1 pc-1int DES_PC1_Transform（ElemType key64, ElemType tempbts56） 56; tempbtscnt = keyPC_1cnt;/密钥置换2 pc-2int DES_PC2_Transform（ElemType key56, ElemType

16、 tempbts48） 48; tempbtscnt = keyPC_2cnt;/E扩展置换 int DES_E_Transform（ElemType data48） /这里data两种用处,故为48位极人臣 ElemType temp48; tempcnt = dataE_Tablecnt; /这里data下标最高为32. memcpy（data,temp,48）;/P置换 int DES_P_Transform（ElemType data32） ElemType temp32; 32; tempcnt = dataP_Tablecnt; memcpy（data,temp,32）;/循环左移

17、 /左右两边同时循环左移相同的位数./10010循环左移1位为00101,左移2位为01010int DES_ROL（ElemType data56, int times） ElemType temp56; /temp只保存将要循环到右边的位. /保存将要循环移动到右边的位 memcpy（temp,data,times）; /保存前28位的移位 memcpy（temp+times,data+28,times）; /保存后28位的移位极人臣 /前28位移动 memcpy（data,data+times,28-times）; /一般移位 memcpy（data+28-times,temp,time

18、s）; /循环位移动 /后28位移动 memcpy（data+28,data+28+times,28-times）; memcpy（data+56-times,temp+times,times）;/生成子密钥 int DES_MakeSubKeys（ElemType key64,ElemType subKeys1648） DES_PC1_Transform（key,temp）;/PC1置换 16; cnt+）/16轮跌代，产生16个子密钥 DES_ROL（temp,MOVE_TIMEScnt）;/Ci Di 左右两边,循环左移 DES_PC2_Transform（temp,subKeyscnt

19、）;/PC2置换，产生子密钥 /异或 int DES_XOR（ElemType R48, ElemType L48 ,int count） count; Rcnt = Lcnt; /异或即为模2加法/S盒置换 48=8*6 32=8*4int DES_SBOX（ElemType data48） int line,row,output; int cur1,cur2; cur1 = cnt*6; cur2 = cnt2; /计算在S盒中的行与列 b1b2b3b4b5b6 b1b2 /b3b4b5b6 line = （datacur11） + datacur1+5; row = （datacur1+

20、13） + （datacur1+22） + （datacur1+33; /取得output二进制倒数第4位为0还是1 datacur2+1 = （output&0X04） /output=7=0111 oxo4=0100 datacur2+2 = （output&0X02） /相&得到0100 右移2位得到1 datacur2+3 = output&0x01;/交换 L分组与R分组交换.int DES_Swap（ElemType left32, ElemType right32） memcpy（temp,left,32）; memcpy（left,right,32）; memcpy（right

21、,temp,32）;/加密单个分组 int DES_EncryptBlock（ElemType plainBlock8, ElemType subKeys1648, ElemType cipherBlock8） ElemType plainBits64; /明文比特 ElemType copyRight48; Char8ToBit64（plainBlock,plainBits）; /初始置换（IP置换） DES_IP_Transform（plainBits）; /16轮迭代 /将右半部分拷贝到数组中. memcpy（copyRight,plainBits+32,32）; /将右半部分进行扩展置

22、换，从32位扩展到48位 DES_E_Transform（copyRight）; /将右半部分与子密钥进行异或操作 DES_XOR（copyRight,subKeyscnt,48）; /异或结果进入S盒，输出32位结果 DES_SBOX（copyRight）; /P置换 DES_P_Transform（copyRight）; /将明文左半部分与右半部分进行异或 DES_XOR（plainBits,copyRight,32）; if（cnt != 15） /最终完成左右部的交换 DES_Swap（plainBits,plainBits+32）; /逆初始置换（IP1置换） DES_IP_1_Tr

23、ansform（plainBits）; Bit64ToChar8（plainBits,cipherBlock）;/解密单个分组 int DES_DecryptBlock（ElemType cipherBlock8, ElemType subKeys1648,ElemType plainBlock8） ElemType cipherBits64; Char8ToBit64（cipherBlock,cipherBits）; DES_IP_Transform（cipherBits）; for（cnt = 15; cnt = 0; cnt-） memcpy（copyRight,cipherBits+32,32）; /这里为什么还是右半部分? /将右半部分与子密钥进