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1、实验二DES加密算法用C语言编写DES算法代码，代码如下：#include#include//明文IP置换坐标intDataIP[]={58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6,64,56,48,40,32,24,16,8,57,49,41,33,25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,13,5,63,55,47,39,31,2
2、3,15,7};charpreData[8];//用户输入的明文charpreKey[8];//用户输入的密钥intData64[64];//8个明文通过十进制转二进制得到的64bit明文intKey64[64];//8个密钥通过十进制转二进制得到的64bit密钥intDataTemp[64];//Data64[]通过IP置换得到的64bit明文，用于得到L0和R0intL0[32],R0[32];intflagDorK=0;//标志位，如果是1的时候表示明文，是0的时候表示密文//此段全局变量服务于段雪琦所写所用函数/
3、/PC_1置换坐标表intPC_1[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};//PC_2置换坐标表intPC_2[48]={14,17,11,24,1,5,3,28,15,6,21,10,23,19,12,4,26,8,16,7,27
4、,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};//迭代左移位数数组intlsi[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};//逆初始置换表IP^-1intIP_1_Table[64]={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
5、,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};intKeyOutBox[48]={0};//输出的子密钥数组intlsinumber=0;//用于记录是第i次加密，lsinumber等于i//sherry第二个函数所用//f操作中将R0扩展为48位的置换坐标表intfExpand48[48]={32,1,2,3,4,5,4,5,6,7,8,9,8,9,10,11,12,13,12,13,14
6、,15,16,17,16,17,18,19,20,21,20,21,22,23,24,25,24,25,26,27,28,29,28,29,30,31,32,31};//P变换置换坐标表intfPChange[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};//S盒置换坐标表intsBox[8][4][16]={{{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0
7、,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},{0,14,4,11,10,4,13,1,5,8,12,6,9,3,2,15},{13,8,10,1,3,15,4
8、,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
