现代对称密码之AES算法Cpp源码
AES.h的源码如下:
#ifndef AES_H #define AES_H typedef unsigned char byte; struct word{ byte wordKey[4]; }; class AES{ public: AES(); void setCipherKey(byte key[]); void setPlainText(byte plain[]); void keyExpansion(byte key[],word w[]); word rotWord(word w); word subWord(word w); word wordXOR(word wl, word w2); //用于处理加密和解密的各函数 void encryption(word in[],word out[],word key[]); void processEncryption(); void addRoundKey (word in[],int round); void subByte(word in[]); void shiftRows(word in[]); void mixColumn(word in[]); byte GFMultiplyByte(byte L,byte R); //用于处理解密的各函数 void decryption(word in[],word out[],word key[]); void processDecryption(); void invShiftRows(word in[]); void invSubByte(word in[]); void invMixColumn(word in[]); void initRcon(); private: byte cipherKey[16]; word plainText[4]; word cipherText[4]; word deCipherText[4]; int Nb,Nk,Nr; word Rcon[11]; word wordKey[44]; static const byte SBox[16][16]; static const byte invSBox[16][16]; static const byte mixColumnMatrix[4][4]; static const byte invMixColumnMatrix[4][4]; }; #endif
AES.cpp的源码如下:
#include "AES.h" void AES::setPlainText(byte plain[]){ int i; for(i=0;i<16;i++){ plainText[i%4].wordKey[i/4]=plain[i]; } } void AES::setCipherKey(byte key[]){ int i; for(i=0;i<16;i++){ cipherKey[i]=key[i]; keyExpansion(cipherKey, wordKey); } } void AES::initRcon(){ int i,j; for(i=0;i<11;i++){ for(j=0;j<4;j++){ Rcon[i].wordKey[j]=0x0; } } Rcon[1].wordKey[0]=0x01; Rcon[2].wordKey[0]=0x02; Rcon[3].wordKey[0]=0x04; Rcon[4].wordKey[0]=0x08; Rcon[5].wordKey[0]=0x10; Rcon[6].wordKey[0]=0x20; Rcon[7].wordKey[0]=0x40; Rcon[8].wordKey[0]=0x80; Rcon[9].wordKey[0]=0x1b; Rcon[10].wordKey[0]=0x36; } const byte AES::mixColumnMatrix[4][4]={ {0x02, 0x03, 0x01, 0x01}, {0x01, 0x02, 0x03, 0x01}, {0x01, 0x01, 0x02, 0x03}, {0x03, 0x01, 0x01, 0x02} }; const byte AES::invMixColumnMatrix[4][4]={ {0x0e, 0x0b, 0x0d, 0x09}, {0x09, 0x0e, 0x0b, 0x0d}, {0x0d, 0x09, 0x0e, 0x0b}, {0x0b, 0x0d, 0x09, 0x0e} }; const byte AES::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} }; //初始化S盒逆 const byte AES::invSBox[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, 0x23, 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, 0xE9, 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, 0x9E, 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} }; void AES::keyExpansion(byte key[], word w[]){ int i=0; int j,k; word temp; while(i<Nk){ for(j=0;j<4;j++){ w[i].wordKey[j]=key[j+4*i]; } i++; } i=Nk; while(i<Nb*(Nr+1)){ temp=w[i-1]; if((i%Nk)==0){ temp=rotWord(temp); temp=subWord(temp); temp=wordXOR(temp, Rcon[i/Nk]); } else if(Nk>6 && (1%Nk)==4){//处理其他可能的情况 temp=subWord(temp); } w[i]=wordXOR(w[i-Nk], temp); i++; } word tempState[44]; for(i=0;i<11;i++){ for(j=0;j<4;j++){ for(k=0;k<4;k++){ tempState[j+i*4].wordKey[k]=w[k+i*4].wordKey[j]; } } } for (i=0;i<44;i++){ for(j=0;j<4;j++){ w[i].wordKey[j]=tempState[i].wordKey[j]; } } } word AES::rotWord(word w){ int i; word temp; for(i=0;i<4;i++){ temp.wordKey[(i+3)%4]=w.wordKey[i]; } return temp; } word AES::subWord(word w){ int i; byte L,R; for(i=0;i<4;i++){ L=w.wordKey[i]>>4; R=w.wordKey[i]&0x0F; w.wordKey[i]=SBox[L][R]; } return w; } word AES::wordXOR(word w1, word w2){ int i; word temp; for(i=0;i<4;i++){ temp.wordKey[i]=w1.wordKey[i]^w2.wordKey[i]; } return temp; } void AES::encryption(word in[],word out[],word key[]){ int i,j,k; for(i=0;i<4;i++){ for(j=0;j<4;j++){ out[i].wordKey[j]=in[i].wordKey[j]; } } addRoundKey(out,0); for(i=1;i<10;i++){ subByte(out); shiftRows(out); mixColumn(out); addRoundKey(out, i); } subByte(out); shiftRows(out); addRoundKey(out, 10); } void AES::subByte(word in[]){ int i,j; byte L,R; for(i=0;i<4;i++){ for(j=0;j<4;j++){ L=in[i].wordKey[j]>>4; R=in[i].wordKey[j]&0x0F; in[i].wordKey[j]=SBox[L][R]; } } } void AES::shiftRows(word in[]){ int i,j; word temp[4]; for(i=0;i<4;i++){ for(j=0;j<4;j++){ temp[i].wordKey[(j+(4-i))%4]=in[i].wordKey[j]; } } for(i=0;i<4;i++){ for(j=0;j<4;j++){ in[i].wordKey[j]=temp[i].wordKey[j]; } } } void AES::mixColumn (word in[]){ word result[4]; int i,j,k; for(i=0;i<4;i++){ for(j=0;j<4;j++){ result[i].wordKey[j]=GFMultiplyByte(mixColumnMatrix[i][0], in[0].wordKey[j]); for(k=1;k<4;k++){ result[i].wordKey[j]^=GFMultiplyByte(mixColumnMatrix[i][k], in[k].wordKey[j]); } } } for(i=0;i<4;i++){ for(j=0;j<4;j++){ in[i].wordKey[j]=result[i].wordKey[j]; } } } byte AES::GFMultiplyByte(byte L, byte R){ byte temp[8]; byte result=0x00; temp[0]=L; int i; for(i=1;i<8;i++){ if(temp[i-1]>=0x80){ temp[i]=(temp[i-1]<<1)^0x1b; } else{ temp[i]=temp[i-1]<<1; } } for(i=0;i<8;i++){ if(int((R>>i)&0x01)==1){ result^=temp[i]; } } return result; } void AES::addRoundKey(word in[], int round){ int i,j; for(i=0;i<4;i++){ for(j=0;j<4;j++){ in[i].wordKey[j]^= wordKey[i+4*round].wordKey[j]; } } } void AES::decryption(word in[], word out[], word key[]){ int i,j,k; for(i=0;i<4;i++){ for(j=0;j<4;j++){ out[i].wordKey[j]=in[i].wordKey[j]; } } addRoundKey(out,10); for(i=9;i>0;i--){ invShiftRows(out); invSubByte(out); addRoundKey(out, i); invMixColumn(out); } invShiftRows(out); invSubByte(out); addRoundKey(out,0); } void AES::invShiftRows(word in[]){ int i,j; word temp[4]; for(i=0;i<4;i++){ for(j=0;j<4;j++){ temp[i].wordKey[(j+i)%4]=in[i].wordKey[j]; } } for(i=0;i<4;i++){ for(j=0;j<4;j++){ in[i].wordKey[j]=temp[i].wordKey[j]; } } } void AES::invSubByte(word in[]){ int i,j; byte L,R; for(i=0;i<4;i++){ for(j=0;j<4;j++){ L=in[i].wordKey[j]>>4; R=in[i].wordKey[j]&0x0F; in[i].wordKey[j]=invSBox[L][R]; } } } void AES::invMixColumn(word in[]){ word result[4]; int i,j,k; for(i=0;i<4;i++){ for(j=0;j<4;j++){ result[i].wordKey[j]=GFMultiplyByte(invMixColumnMatrix[i][0], in[0].wordKey[j]); for(k=1;k<4;k++){ result[i].wordKey[j]^=GFMultiplyByte(invMixColumnMatrix[i][k], in[k].wordKey[i]); } } } for(i=0;i<4;i++){ for(j=0;j<4;j++){ in[i].wordKey[j] = result[i].wordKey[j]; } } }