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AES的C++实现(128位密钥)作者：Veiz     发表时间：2006-06-19 

AES的C++实现(128位密钥)//  写了一个AES的C++实现，仅支持128位密钥， 写得匆忙，不够规范，仅供参考。

//    AES.h

#ifndef AES_H_

#define AES_H_

#include <bitset>

#include <utility>

using namespace std;

class AES{

public: 

typedef unsigned char    byte;

static const int KEY_SIZE = 16;    //    密钥长度为128位 

static const int N_ROUND = 11; 

byte plainText[16];    //    明文   

byte

state[16];    //    当前分组

byte cipherKey[16];    //    密钥   

byte roundKey[N_ROUND][16];    //轮密钥 

byte cipherText[16];    //密文 

byte SBox[16][16];    //    S盒 

byte InvSBox[16][16];    //    逆S盒 

void EncryptionProcess(); 

void DecryptionProcess();  

void Round(const int& round); 

void InvRound(const int& round); 

void FinalRound(); 

void InvFinalRound(); 

void KeyExpansion(); 

void AddRoundKey(const int& round);  

void SubBytes(); 

void InvSubBytes(); 

void ShiftRows(); 

void InvShiftRows(); 

void MixColumns(); 

void InvMixColumns(); 

void BuildSBox(); 

void BuildInvSBox(); 

void InitialState(const byte* text);   

void InitialCipherText(); 

void InitialplainText(); 

byte GFMultplyByte(const byte& left, const byte& right);

const byte* GFMultplyBytesMatrix(const byte* left, const byte* right);

public:

AES();

const byte* Cipher(const byte* text, const byte* key, const int& keySize);

const byte* InvCipher(const byte* text, const byte* key, const int& keySize);};

void AES::EncryptionProcess(){    //    加密过程

InitialState(plainText);   

KeyExpansion();    //    密钥扩展

AddRoundKey(0);    //    轮密钥加   

for(int i = 1; i < N_ROUND-1; ++i)   

{                   Round(i);    }   

FinalRound();    InitialCipherText();<p}

void AES:[s:3]ecryptionProcess(){    //    解密过程

InitialState(cipherText);

KeyExpansion(); 

InvFinalRound(); 

for(int i = N_ROUND-2; i > 0 ; --i)

{                   InvRound(i);    }

AddRoundKey(0); 

InitialplainText();}

void AES::Round(const int& round){    //    正常轮

SubBytes(); 

ShiftRows(); 

MixColumns(); 

AddRoundKey(round);       }

void AES::InvRound(const int& round){    //    正常轮的逆  

  AddRoundKey(round);      

InvMixColumns(); 

InvShiftRows(); 

InvSubBytes();           }

void AES::FinalRound(){    //    最后轮

SubBytes(); 

ShiftRows(); 

AddRoundKey(N_ROUND - 1);}

void AES::InvFinalRound(){    //    最后轮的逆 

AddRoundKey(N_ROUND - 1); 

InvShiftRows();

InvSubBytes();       }

void AES::KeyExpansion(){    //    密钥扩展

const byte rcon[N_ROUND][4] = {

{0x00, 0x00, 0x00, 0x00}, 

{0x01, 0x00, 0x00, 0x00}, 

{0x02, 0x00, 0x00, 0x00}, 

{0x04, 0x00, 0x00, 0x00},

{0x08, 0x00, 0x00, 0x00},

{0x10, 0x00, 0x00, 0x00},

{0x20, 0x00, 0x00, 0x00}, 

{0x40, 0x00, 0x00, 0x00}, 

{0x80, 0x00, 0x00, 0x00}, 

{0x1b, 0x00, 0x00, 0x00}, 

{0x36, 0x00, 0x00, 0x00} }; 

for(int i = 0; i < 16; ++i)        {

roundKey[0][i] = cipherKey[i];        }       

for(int i = 0; i < 4; ++i) 

{    //  roundKey[0][16]为cipherKey的转置矩阵

for(int j = 0; j < 4; ++j)            { 

roundKey[0][4*i + j] = cipherKey[4*j + i];            }        }

for(int roundIndex = 1;

roundIndex < N_ROUND;

++roundIndex)       

{            byte rotWord[4] = {0x00};     

rotWord[0] = roundKey[roundIndex - 1][3];

rotWord[1] = roundKey[roundIndex - 1][7]; 

rotWord[2] = roundKey[roundIndex - 1][11];

rotWord[3] = roundKey[roundIndex - 1][15]; 

std::swap<byte>(rotWord[0], rotWord[1]); 

std::swap<byte>(rotWord[1], rotWord[2]);

std::swap<byte>(rotWord[2], rotWord[3]);

for(int i = 0; i < 4; ++i)           

{                rotWord[i] = SBox[ rotWord[i] >> 4][ rotWord[i] & 0x0f ];                roundKey[roundIndex][4*i] = roundKey[roundIndex - 1][4*i] ^ rotWord[i] ^ rcon[roundIndex][i];            }            for(int j = 1; j < 4; ++j)            {                for(int i = 0; i < 4; ++i)                {                    roundKey[roundIndex][4*i + j] = roundKey[roundIndex - 1][4*i + j] ^ roundKey[roundIndex][4*i + j - 1];                }            }        }}

void AES::AddRoundKey(const int& round){    //    轮密钥加    for(int i = 0; i < 16; ++i)    {    //    利用当前分组state和第round组扩展密钥进行按位异或        state[i] ^= roundKey[round][i];    }}void AES::SubBytes(){    //    字节代换    for(int i = 0; i < 16; ++i)    {        state[i] = SBox[ state[i] >> 4][ state[i] & 0x0f ];    }}void AES::InvSubBytes(){    //    逆字节代换    for(int i = 0; i < 16; ++i)    {        state[i] = InvSBox[ state[i] >> 4][ state[i] & 0x0f ];    }}void AES::ShiftRows(){    //    行变换    //state第一行保持不变    // Do nothing.    //state第二行循环左移一个字节    std::swap<byte>(state[4], state[5]);    std::swap<byte>(state[5], state[6]);    std::swap<byte>(state[6], state[7]);           //state第三行循环左移两个字节    std::swap<byte>(state[8], state[10]);    std::swap<byte>(state[9], state[11]);    //state第三行循环左移三个字节    std::swap<byte>(state[14], state[15]);    std::swap<byte>(state[13], state[14]);    std::swap<byte>(state[12], state[13]);   }void AES::InvShiftRows(){    //    行变换反演    //state第一行保持不变    // Do nothing.    //state第二行循环右移一个字节    std::swap<byte>(state[6], state[7]);    std::swap<byte>(state[5], state[6]);    std::swap<byte>(state[4], state[5]);           //state第三行循环右移两个字节    std::swap<byte>(state[9], state[11]);    std::swap<byte>(state[8], state[10]);    //state第三行循环右移三个字节    std::swap<byte>(state[12], state[13]);    std::swap<byte>(state[13], state[14]);           std::swap<byte>(state[14], state[15]);   }void AES::MixColumns(){    //    列混淆    byte matrix[4][4] = {        {0x02, 0x03, 0x01, 0x01},        {0x01, 0x02, 0x03, 0x01},        {0x01, 0x01, 0x02, 0x03},        {0x03, 0x01, 0x01, 0x02}};        const byte* temp = GFMultplyBytesMatrix((byte*)matrix, state);        for(int i = 0; i < 16; ++i)        {            state[i] = temp[i];        }        delete[] temp;}void AES::InvMixColumns(){    //    列混淆反演    byte matrix[4][4] = {        {0x0e, 0x0b, 0x0d, 0x09},        {0x09, 0x0e, 0x0b, 0x0d},        {0x0d, 0x09, 0x0e, 0x0b},        {0x0b, 0x0d, 0x09, 0x0e} };        const byte* temp = GFMultplyBytesMatrix((byte*)matrix, state);        for(int i = 0; i < 16; ++i)        {            state[i] = temp[i];        }        delete[] temp;}void AES::BuildSBox(){    //    构建S盒    byte box[16][16] =    {        /*        0     1     2     3     4     5     6     7     8     9     a     b     c     d     e     f */        /*0*/  {0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76},        /*1*/  {0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0},        /*2*/  {0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15},        /*3*/  {0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75},        /*4*/  {0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84},        /*5*/  {0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf},        /*6*/  {0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8},        /*7*/  {0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2},        /*8*/  {0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73},        /*9*/  {0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb},        /*a*/  {0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79},        /*b*/  {0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08},        /*c*/  {0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a},        /*d*/  {0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e},        /*e*/  {0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf},        /*f*/  {0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16}    };    for(int i = 0; i < 16; ++i)    {        for(int j = 0; j < 16; ++j)        {            SBox[i][j] = box[i][j];        }    }}void AES::BuildInvSBox(){    //    构建逆S盒    byte box[16][16] =    {        /*        0     1     2     3     4     5     6     7     8     9     a     b     c     d     e     f */        /*0*/  {0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb},        /*1*/  {0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb},        /*2*/  {0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e},        /*3*/  {0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25},        /*4*/  {0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92},        /*5*/  {0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84},        /*6*/  {0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06},        /*7*/  {0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b},        /*8*/  {0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73},        /*9*/  {0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e},        /*a*/  {0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b},        /*b*/  {0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4},        /*c*/  {0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f},        /*d*/  {0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef},        /*e*/  {0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61},        /*f*/  {0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d}    };    for(int i = 0; i < 16; ++i)    {        for(int j = 0; j < 16; ++j)        {            InvSBox[i][j] = box[i][j];        }    }}void AES::InitialState(const byte* text){    //    state初始时候为明(密)文矩阵的转置矩阵    for(int i = 0; i < 4; ++i)    {    //转置text存放在state中        for(int j = 0; j < 4; ++j)        {            state[4*i + j] = text[4*j + i];        }    }}void AES::InitialCipherText(){    //    state被复制到输出矩阵中       for(int i = 0; i < 4; ++i)    {    //转置state存放在cipherText中        for(int j = 0; j < 4; ++j)        {            cipherText[4*i + j] = state[4*j + i];        }    }}void AES::InitialplainText(){    //    state被复制到输入矩阵中    for(int i = 0; i < 4; ++i)    {    //转置state存放在plainText中        for(int j = 0; j < 4; ++j)        {            plainText[4*i + j] = state[4*j + i];        }    }}AES::byte AES::GFMultplyByte(const byte& left, const byte& right){    //有限域GF(2^8)上的乘法    byte temp[8];    bitset<8> bits((unsigned long)right);    //把right化为8个二进制位存放在bits中    temp[0] = left;    for(int i = 1; i < 8; ++i)    {        if(temp[i-1] >= 0x80)    //若 (temp[i-1] 首位为"1"        {            temp[i] = temp[i-1] << 1;            temp[i] = temp[i] ^ 0x1b;    //与(00011011)异或        }        else        {            temp[i] = temp[i-1] << 1;        }    }    byte result = 0x00;    for(int i = 0; i < 8; ++i)    {        if(bits[i] == 1)        {            result ^= temp[i];        }    }    return result;}const AES::byte* AES::GFMultplyBytesMatrix(const byte* left, const byte* right){    //有限域GF(2^8)上的矩阵(4*4)乘法    AES::byte* result = new AES::byte[16];    for(int i = 0; i < 4; ++i)    {        for(int j = 0; j < 4; ++j)        {            result[4*i + j] = GFMultplyByte(left[4*i], right[j]);            for(int k = 1; k < 4; ++k)            {                result[4*i + j] ^= GFMultplyByte(left[4*i + k], right[4*k + j]);            }        }    }    return result;}AES::AES(){    BuildSBox();    BuildInvSBox();}const AES::byte* AES::Cipher(const byte* text, const byte* key, const int& keySize){    //    用key给text加密    for(int i = 0; i < 16; ++i)    {        plainText[i] = text[i];    }    for(int i = 0; i < keySize; ++i)    {        cipherKey[i] = key[i];    }    EncryptionProcess();    return cipherText;}const AES::byte* AES::InvCipher(const byte* text, const byte* key, const int& keySize){    //    用key给text解密    for(int i = 0; i < 16; ++i)    {        cipherText[i] = text[i];    }    for(int i = 0; i < keySize; ++i)    {        cipherKey[i] = key[i];    }    DecryptionProcess();    return plainText;}#endif /* AES_H_ *///    main.cpp#include <string>#include <fstream>#include <iostream>#include "AES.h"using namespace std;int main(int argc, char* argv[]){    const string USAGE = "Usage:    AES [-E | -D] destinationfile sourcefile keyfile ";    if(argc != 5)    {        cout << USAGE << endl;        return 1;    }    ifstream is(argv[3], ios::in | ios::binary);    if(!is)    {        cerr << "InputFileNotFoundException" << endl;        return 2;    }    ifstream ks(argv[4], ios::in | ios::binary);    if(!ks)    {        cerr << "KeyFileNotFoundException" << endl;        return 2;    }    AES aes;    const unsigned char *key = new unsigned char[16];    XXXXXad((char*)key, 16);    ofstream os(argv[2], ios:[s:6]ut | ios::binary);    if(strcmp(argv[1], "-E") == 0 || strcmp(argv[1], "-e") == 0)    {        const unsigned char* cipherText;        const unsigned char* plainText = new unsigned char[16];        while(XXXXXad((char*)plainText, 16))        {            cipherText = XXXXXXpher(plainText, key, 16);            os.write((const char*)cipherText, 16);        }       }    if(strcmp(argv[1], "-D") == 0 || strcmp(argv[1], "-d") == 0)    {        const unsigned char* plainText;        const unsigned char* cipherText = new unsigned char[16];        while(XXXXXad((char *)cipherText, 16))        {            plainText = XXXXXXvCipher(cipherText, key, 16);            os.write((const char*)plainText, 16);        }           delete[] cipherText;    }    delete[] key;    XXXXXose();    XXXXXose();    XXXXXose();    return 0;}
注：vckbase转来的，VC++8.0编译通不过