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];
}
}
}

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