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#include <iostream>
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#include <algorithm>
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#include <cstring>
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#include <cstdio>
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using namespace std;
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// 初始置换表
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const int TRANS_INIT[] = {
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58, 50, 42, 34, 26, 18, 10, 2,
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60, 52, 44, 36, 28, 20, 12, 4,
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62, 54, 46, 38, 30, 22, 14, 6,
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64, 56, 48, 40, 32, 24, 16, 8,
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57, 49, 41, 33, 25, 17, 9, 1,
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59, 51, 43, 35, 27, 19, 11, 3,
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61, 53, 45, 37, 29, 21, 13, 5,
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63, 55, 47, 39, 31, 23, 15, 7 };
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// 结尾置换表
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const int TRANS_END[] = {
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40, 8, 48, 16, 56, 24, 64, 32,
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39, 7, 47, 15, 55, 23, 63, 31,
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38, 6, 46, 14, 54, 22, 62, 30,
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37, 5, 45, 13, 53, 21, 61, 29,
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36, 4, 44, 12, 52, 20, 60, 28,
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35, 3, 43, 11, 51, 19, 59, 27,
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34, 2, 42, 10, 50, 18, 58, 26,
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33, 1, 41, 9, 49, 17, 57, 25 };
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// 密钥置换表：将64位密钥变成56位
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const int TRANS_64to56[] = {
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57, 49, 41, 33, 25, 17, 9,
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1, 58, 50, 42, 34, 26, 18,
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10, 2, 59, 51, 43, 35, 27,
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19, 11, 3, 60, 52, 44, 36,
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63, 55, 47, 39, 31, 23, 15,
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7, 62, 54, 46, 38, 30, 22,
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14, 6, 61, 53, 45, 37, 29,
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21, 13, 5, 28, 20, 12, 4 };
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// 压缩置换：将56位密钥压缩成48位子密钥
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const int TRANS_56to48[] = {
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14, 17, 11, 24, 1, 5,
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3, 28, 15, 6, 21, 10,
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23, 19, 12, 4, 26, 8,
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16, 7, 27, 20, 13, 2,
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41, 52, 31, 37, 47, 55,
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30, 40, 51, 45, 33, 48,
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44, 49, 39, 56, 34, 53,
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46, 42, 50, 36, 29, 32 };
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// 循环左移表
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const int SHIFT_TAB[] = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };
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// 扩展置换表：将32位扩展至48位
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const int EXPAND_32to48[] = { 32, 1, 2, 3, 4, 5,
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4, 5, 6, 7, 8, 9,
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8, 9, 10, 11, 12, 13,
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12, 13, 14, 15, 16, 17,
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16, 17, 18, 19, 20, 21,
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20, 21, 22, 23, 24, 25,
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24, 25, 26, 27, 28, 29,
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28, 29, 30, 31, 32, 1 };
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// S盒：每个S盒是4x16的置换表，6位->4位
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const int S_BOX[8][4][16] = {
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{
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{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7},
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{0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8},
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{4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0},
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{15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13}
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},
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{
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{15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10},
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{3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5},
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{0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15},
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{13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9}
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},
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{
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{10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8},
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{13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1},
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{13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7},
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{1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12}
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},
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{
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{7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15},
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{13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9},
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{10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4},
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{3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14}
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},
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{
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{2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9},
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{14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6},
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{4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14},
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{11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3}
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},
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{
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{12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11},
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{10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8},
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{9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6},
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{4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13}
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},
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{
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{4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1},
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{13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6},
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{1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2},
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{6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12}
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},
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{
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{13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7},
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{1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2},
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{7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8},
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{2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11}
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}
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};
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// 32位置换，32位 -> 32位
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const int TRANS_32to32[] = {
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16, 7, 20, 21,
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29, 12, 28, 17,
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1, 15, 23, 26,
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5, 18, 31, 10,
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2, 8, 24, 14,
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32, 27, 3, 9,
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19, 13, 30, 6,
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22, 11, 4, 25 };
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//输出数组内容
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template <typename T>
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void printarr(T* line,int len)
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{
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for (int i = 0; i < len; i++)
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{
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cout << line[i];
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}
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cout << endl;
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}
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//将密钥转化为64位二进制
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void SETKEY(const char Key_C[8], bool Key_B[64]) {
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for (int i = 0; i < 8; i++) {
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char c = Key_C[i];
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for (int j = 0; j < 8; j++) {
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Key_B[i * 8 + j] = (c >> (7 - j)) & 1;
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}
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}
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}
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//字节转化为bit
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void ByteToBit(bool* Outs, const char* In, int bits) {
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for (int i = 0; i < bits; i++) {
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char c = In[i];
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for (int j = 0; j < 8; j++) {
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Outs[i * 8 + j] = (c >> (7 - j)) & 1;
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}
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}
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}
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//bit转换为字节
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void BitToByte(char* Outs, const bool* In, int bits) {
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for (int i = 0; i < bits; i++) {
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char c = 0;
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for (int j = 0; j < 8; j++) {
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c |= (In[i * 8 + j] << (7 - j));
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}
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Outs[i] = (char)c;
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}
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}
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//循环左移的实现
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void CYCLELEFT(bool* In, int len, int loop) {
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bool* temp=new bool [len];
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for (int i = 0; i < len; i++) {
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temp[i] = In[(i + loop) % len];
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}
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//memcpy拷贝函数
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memcpy(In, temp, len * sizeof(bool));
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delete [] temp;
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}
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//生成每一轮的子密钥
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void Set_SubKey(bool subKey[16][48], bool Key[64]) {
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bool K_plus[56];
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//选择置换
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for (int i = 0; i < 56; i++) {
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K_plus[i] = Key[TRANS_64to56[i] - 1];
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}
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bool C[28], D[28];
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memcpy(C, K_plus, 28);
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memcpy(D, K_plus + 28, 28);
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for (int i = 0; i < 16; i++) {
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CYCLELEFT(C, 28, SHIFT_TAB[i]);
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CYCLELEFT(D, 28, SHIFT_TAB[i]);
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bool CD[56];
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memcpy(CD, C, 28);
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memcpy(CD + 28, D, 28);
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for (int j = 0; j < 48; j++) {
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subKey[i][j] = CD[TRANS_56to48[j] - 1];
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}
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}
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}
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//实现左半部分与轮函数结果的异或操作
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void XOR(bool* InA, const bool* InB, int len) {
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for (int i = 0; i < len; i++) {
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InA[i] ^= InB[i];
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}
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}
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//选择变换压缩S盒替代
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void S_BOXF(bool Out[32], const bool In[48]) {
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for (int i = 0; i < 8; i++) {
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int row = (bool)(In[i * 6] << 1) | In[i * 6 + 5];
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int col = (bool)(In[i * 6 + 1] << 3) | (In[i * 6 + 2] << 2) | (In[i * 6 + 3] << 1) | In[i * 6 + 4];
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int val = S_BOX[i][row][col];
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Out[i * 4] = (val >> 3) & 1;
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Out[i * 4 + 1] = (val >> 2) & 1;
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Out[i * 4 + 2] = (val >> 1) & 1;
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Out[i * 4 + 3] = val & 1;
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}
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}
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//轮函数F变换
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void F_FUNCTION(bool In[32], const bool Ki[48]) {
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bool expanded[48];
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for (int i = 0; i < 48; i++) {
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expanded[i] = In[EXPAND_32to48[i] - 1];
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}
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XOR(expanded, Ki, 48);
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bool s_out[32];
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S_BOXF(s_out, expanded);
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bool p_out[32];
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for (int i = 0; i < 32; i++) {
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p_out[i] = s_out[TRANS_32to32[i] - 1];
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}
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memcpy(In, p_out, 32);
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}
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//DES操作，type为1即加密，为0即解密
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void DES(char Out[8], char In[8], const bool subKey[16][48], bool Type) {
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bool data[64];
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ByteToBit(data, In, 8);
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bool ip_data[64];
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for (int i = 0; i < 64; i++) {
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ip_data[i] = data[TRANS_INIT[i] - 1];
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}
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bool L[32], R[32];
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memcpy(L, ip_data, 32);
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memcpy(R, ip_data + 32, 32);
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for (int round = 0; round < 16; round++) {
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bool tempR[32];
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memcpy(tempR, R, 32);
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F_FUNCTION(tempR, subKey[Type ? round : 15 - round]);
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XOR(tempR, L, 32);
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memcpy(L, R, 32);
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memcpy(R, tempR, 32);
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}
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bool RL[64];
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memcpy(RL, R, 32);
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memcpy(RL + 32, L, 32);
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bool result[64];
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for (int i = 0; i < 64; i++) {
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result[i] = RL[TRANS_END[i] - 1];
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}
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BitToByte(Out, result, 8);
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}
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int main()
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{
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char text[8], destext[8], newline[8],key[8];
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bool skey[64],stext[64],subkey[16][48],answer[64];
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cout << "请输入明文：";
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for (int i = 0; i < 8; i++)
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{
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cin >> text[i];
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}
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cout << "请输入密钥：";
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for (int i = 0; i < 8; i++)
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{
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cin >> key[i];
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}
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cout << "明文:";
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printarr(text, 8);
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cout << "密钥:";
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printarr(key, 8);
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cout << "明文二进制码：";
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ByteToBit(stext,text,8);
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printarr(stext, 64);
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SETKEY(key, skey);
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cout << "密钥二进制码：";
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printarr(skey, 64);
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Set_SubKey(subkey, skey);
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DES(destext, text, subkey, 1);
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ByteToBit(answer, destext, 8);
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cout << "密文为：";
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printarr(answer, 64);
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cout << "测试对刚加密的密文进行解密操作";
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DES(newline, destext, subkey, 0);
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cout << "解密结果为";
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printarr(newline, 8);
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} |
