最近对加密算法比较感兴趣，看见了大佬的博客，周末没啥事干，就跟着大佬的思路，自己尝试着手写，肝了一天，终于写出来了。没想到写这个，非但不枯燥，反而还很上头，活动活动思维还是挺好的。 https://blog.csdn.net/qq_28205153/article/details/55798628
暂时还没有添加注释，优化修改之类的，只是实现了加密，解密的功能，也没有扩展。测试方便，本人只写了加密内容为16字节。更长的内容，很容易就可以扩展了。
#ifndef MYAES_H #define MYAES_H #include <iostream> #include <vector> using namespace std; static int a = 5; static unsigned char sbox[16][16] = {{0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76}, {0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0}, {0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15}, {0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75}, {0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84}, {0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf}, {0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8}, {0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2}, {0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73}, {0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb}, {0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79}, {0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08}, {0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a}, {0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e}, {0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf}, {0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16}}; static unsigned char rsbox[16][16] = {{0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb}, {0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb}, {0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e}, {0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25}, {0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92}, {0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84}, {0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06}, {0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b}, {0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73}, {0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e}, {0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b}, {0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4}, {0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f}, {0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef}, {0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61}, {0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d}}; static unsigned char rcon[10][4] = { {0x01,0x0,0x0,0x0},{0x2,0x0,0x0,0x0},{0x4,0x0,0x0,0x0},{0x8,0x0,0x0,0x0},{0x10,0x0,0x0,0x0}, {0x20,0x0,0x0,0x0},{0x40,0x0,0x0,0x0},{0x80,0x0,0x0,0x0},{0x1b,0x0,0x0,0x0},{0x36,0x0,0x0,0x0} }; static unsigned char mixcol[4][4] = { {0x2,0x3,0x1,0x1},{0x1,0x2,0x3,0x1},{0x1,0x1,0x2,0x3},{0x3,0x1,0x1,0x2} // {0x02,0x03,0x01,0x01},{0x01,0x02,0x03,0x01},{0x01,0x01,0x02,0x03},{0x03,0x01,0x01,0x02} }; static unsigned char rmixcol[4][4] = { {0xe,0xb,0xd,0x9},{0x9,0xe,0xb,0xd},{0xd,0x9,0xe,0xb},{0xb,0xd,0x9,0xe} }; struct sixteen{ unsigned char s[4][4]; }; struct four{ unsigned char s[4]; }; class MyAES { public: MyAES(); unsigned char getSBox(char old) { char high = (old&0xf0)>>4; char low = (old&0x0f); return sbox[high][low]; // return sbox[(int)high][(int)low]; } unsigned char getRSBox(char old) { char high = (old&0xf0)>>4; char low = (old&0x0f); return rsbox[high][low]; // return sbox[(int)high][(int)low]; } sixteen rmoveX(sixteen st) { sixteen ne; for(int i=0;i<4;i++) { for(int j=3;j>=0;j--) { ne.s[i][j] = st.s[i][(j-i+4)%4]; cout<<"ne = "<<(int)ne.s[i][j]<<endl; } } for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { cout<<(int)ne.s[i][j]<<" "; } cout<<endl; } return ne; } sixteen moveX(sixteen old)//行移位 { cout<<"before hangyiwei"<<endl; for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { printf("%0x ",old.s[i][j]); } cout<<endl; } sixteen ne; for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { ne.s[i][j] = old.s[i][(j+i)%4]; // cout<<"ne = "<<(int)ne.s[i][j]<<endl; } } cout<<"after hangyiwei"<<endl; for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { printf("%0x ",ne.s[i][j]); } cout<<endl; } return ne; } void setKey(unsigned char* c)//反正只取前16字节，长度不够，暂未考虑 { int now = 0; for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { key.s[j][i] = (*c++); } } for(int i=0;i<4;i++)//前4个word { for(int j=0;j<4;j++) { mixWord[i].s[j] = key.s[j][i]; } } for(int i=4;i<44;i++)//后40个word { if(i%4!=0) { for(int j=0;j<4;j++) { mixWord[i].s[j] = mixWord[i-4].s[j]^mixWord[i-1].s[j]; } } else { four temp = mixWord[i-1]; for(int j=0;j<4;j++) { // printf("j = %d old = %0x\n",j,temp.s[j]); temp.s[j] = mixWord[i-1].s[(j+1)%4];//字循环 // printf("j = %d temp = %0x\n",j,temp.s[j]); temp.s[j] = getSBox(temp.s[j]);//字节代换 // printf("daihuan j = %d temp = %0x\n",j,temp.s[j]); // printf("lunzi %0x \n",rcon[((i%4)-1)][j]); temp.s[j] = temp.s[j]^rcon[(i/4-1)][j];//轮常量异或 // printf("ron j = %d temp = %0x\n",j,temp.s[j]); mixWord[i].s[j] = mixWord[i-4].s[j]^temp.s[j]; } } // break; } // cout<<"输出密钥 print "<<endl; // for(int i=0;i<8;i++) // { // for(int j=0;j<4;j++) // { //// cout<<(int)mixWord[i].s[j]<<" "; // printf("%0x ",mixWord[i].s[j]); // } // cout<<endl; // } } void setText(unsigned char* c)//反正只取前16字节，长度不够，暂未考虑 { for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { text.s[j][i] = (*c++); } } } void addRoundKey(int round) { for(int i=0;i<4;i++) { four temp = mixWord[round*4+i]; for(int j=0;j<4;j++) { text.s[j][i]^=temp.s[j]; } } } sixteen changeByte(sixteen old)//字节代换 { for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { old.s[i][j] = getSBox(old.s[i][j]); } } return old; } sixteen rchangeByte(sixteen old)//字节代换 { for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { old.s[i][j] = getRSBox(old.s[i][j]); } } return old; } char test(char a) { char first = (a&0x80)>>7; // cout<<"first = "<<(int)first<<endl; if(first==1) { a<<=1; a^=0x1b; } else { a <<=1; } // printf("%0x\n",a); return a; } char calcValue(unsigned char old,unsigned char value) { // printf("old = %0x,value = %0x\n",old,value); char total = old; char tempa; unsigned char begin = 0x80; vector<char> v; while (begin>0) { unsigned char temp = value&begin; // if(temp!=0) // printf("temp = %0x\n",temp); old = total; bool first = false; if(temp==1) { v.push_back(old); } while(temp>=2) { first = true; old = test(old); temp>>=1; } if(first) { // cout<<"size = "<<v.size()<<endl; // printf("old = %2x\n",old); v.push_back(old); } begin>>=1; } if(v.size()==0) { return total; } total = v[0]; for(int i=1;i<v.size();i++) { total^=v[i]; } return total; } char calc(unsigned char old[],int col) { // cout<<"col = "<<col<<endl; for(int i=0;i<4;i++) { printf("%2x ",mixcol[col][i]); } cout<<endl; for(int i=0;i<4;i++) { printf("%2x ",old[i]); } cout<<"=========="<<endl; for(int i=0;i<4;i++) { old[i] = calcValue(old[i],mixcol[col][i]); printf("old[%d] = %2x\n",i,old[i]); } return old[0]^old[1]^old[2]^old[3]; } char rcalc(unsigned char old[],int col) { // cout<<"col = "<<col<<endl; for(int i=0;i<4;i++) { printf("%2x ",rmixcol[col][i]); } cout<<endl; for(int i=0;i<4;i++) { printf("%2x ",old[i]); } cout<<"=========="<<endl; for(int i=0;i<4;i++) { old[i] = calcValue(old[i],rmixcol[col][i]); printf("old[%d] = %2x\n",i,old[i]); } return old[0]^old[1]^old[2]^old[3]; } sixteen mixCol(sixteen old) { sixteen temp; for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { unsigned char tmp[4]; tmp[0] = old.s[0][j]; tmp[1] = old.s[1][j]; tmp[2] = old.s[2][j]; tmp[3] = old.s[3][j]; // temp.s[i][j] = calc(old.s[j],i); temp.s[i][j] = calc(tmp,i); } } return temp; } sixteen rmixCol(sixteen old) { sixteen temp; for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { unsigned char tmp[4]; tmp[0] = old.s[0][j]; tmp[1] = old.s[1][j]; tmp[2] = old.s[2][j]; tmp[3] = old.s[3][j]; // temp.s[i][j] = calc(old.s[j],i); temp.s[i][j] = rcalc(tmp,i); } } return temp; } void encrypt() { addRoundKey(0); for(int i=1;i<10;i++) { text = changeByte(text);//字节代换 text = moveX(text);//行移位 // text.s[0][0] = 0xc9; // text.s[1][0] = 0x7a; // text.s[2][0] = 0x63; // text.s[3][0] = 0xb0; text = mixCol(text); addRoundKey(i);//轮密钥加 // return; } //第10轮 text = changeByte(text);//字节代换 text = moveX(text);//行移位 addRoundKey(10);//轮密钥加 cout<<"print total"<<endl; for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { printf("%0x ",text.s[i][j]); } cout<<endl; } } void decrypt() { addRoundKey(10); text = rmoveX(text); text = rchangeByte(text); for(int i=9;i>=1;i--) { addRoundKey(i); text = rmixCol(text); text = rmoveX(text); text = rchangeByte(text); } addRoundKey(0); cout<<"print total"<<endl; for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { printf("%0x ",text.s[i][j]); } cout<<endl; } } void addRoundKey2(int round) { for(int i=0;i<4;i++) { // four temp = mixWord[round*4+i]; four temp; temp.s[0] = rword[round].s[0][i]; temp.s[1] = rword[round].s[1][i]; temp.s[2] = rword[round].s[2][i]; temp.s[3] = rword[round].s[3][i]; for(int j=0;j<4;j++) { text.s[j][i]^=temp.s[j]; } } } void decrypt2() { for(int i=0;i<11;i++) { for(int j=0;j<4;j++) { for(int k=0;k<4;k++) { rword[i].s[k][j] = mixWord[4*i+j].s[k]; } } rword[i] = rmixCol(rword[i]); } addRoundKey(10); for(int i=9;i>=1;i--) { text = rchangeByte(text); text = rmoveX(text); text = rmixCol(text); addRoundKey2(i); } text = rchangeByte(text); text = rmoveX(text); addRoundKey(0); cout<<"print total"<<endl; for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { printf("%0x ",text.s[i][j]); } cout<<endl; } } private: sixteen text; sixteen key; four mixWord[44]; sixteen rword[11]; }; #endif // MYAES_H
本来想用Java写的，但是太久没用，基本的代码规范都忘了，尤其难以忍受的，就是必须一个字节有些太大了，必须加上（Byte）转换，太太太麻烦了。
C++其实也不太熟，从学计算机以来，就知道C非常的灵活，但是从来没有用过位操作，刚开始写着还不太熟，后来就感觉得心应手。越发觉得C语言是真的好用。
写这个算法倒不是为了干什么，真正要用的话，Java/php/openssl都有现成的，找起来很容易，就是C++实现的，网上也不难找。
主要的还是为了锻炼自己的能力吧，以前最头疼的就是看见那种很多位操作的算法，因为一窍不通，所以敬而远之。
现在用了将近500行才实现，后续应该可以优化得更加简洁，有时间，又有兴趣的时候干吧。
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