• AES密码加密


    AES加密

    TOC

    要求

    • 明文、密钥和向量都是通过文件输入,密文通过文件输出
    • 可以通过选择加密模式:CBC和EBC
    • 计算程序运行时间
    • 对于长度的不够的情况,在最后填充0来补足
    • 输出最后一块的加密结果

    分析

    • 对于文件的输入输出,主要就是用到了C语言的文件读入和读出
        ofstream is1(argv[3],ios::app);
        if (!is1)
        {
            cerr << "InputFileNotFoundException" << endl;
            return 2;
        }
    
        is1.write((char*)zero, 16);
        is1.close();
    
        ifstream is(argv[3], ios::in | ios::binary|ios::app);
        if (!is)
        {
            cerr << "InputFileNotFoundException" << endl;
            return 2;
        }
    
        ifstream ks(argv[4], ios::in | ios::binary);
        if (!ks)
        {
            cerr << "KeyFileNotFoundException" << endl;
            return 2;
        }
    • 在程序中供模式选择,并且根据选择来进行不同的处理
    cout << "please choose mode: " << endl;
    cin >> mode;</pre>
    • 为了方便处理不同工作模式下的要求,我在处理的时候把初始化向量和密钥分开放置在两个不同的文件内:key.txt和iv.txt
      这样的话,在EBC模式下就可以少读取一个文件。同时分开存放也比较方便。
    • 补0
      对于补0的情况,为了方便处理,在文件读取之前,先在文件末尾写入16个字节的0,在处理的时候,如果读到全零的情况就直接跳出。
      这样处理比较简单方便
    • 时间计算
      为了得到比较精准的结果,通过两种不同的时间函数来进行计算
    //定义变量
    clock_t start, finish;
    DWORD startt, finisht;
    
    //调用函数
    start = clock();
    startt = GetTickCount();</pre>
    
    
    //结果
    cout << "
    Time: " << ( finish - start ) << endl;
    cout << "
    Time: " << (finisht - startt) << endl;</pre>

    设计

    • 使用方式
      明文、密钥、初始化向量都写在文件中,文件名称通过命令行输入,对于命令行输入的参数有要求
    const string USAGE = "Usage:    AES [-E | -D] destinationfile sourcefile keyfile ";
    
    if (argc != 5)
    {
        cout << USAGE << endl;
        return 1;
    }
    • 对于补0的情况
      通过在文件中补0来完成,避免过多的对数组的操作
    const string USAGE = "Usage:    AES [-E | -D] destinationfile sourcefile keyfile ";

    结果

    默认参数设置

    • ECB模式

    上面命令行中显示的是最后一块的加密结果,完整 的加密结果如下:

    • CBC模式

      备注一下:
      我这里用到的是debug模式的结果,所以时间特别长。
      在实际用release在cmd中运行的时候,时间大概在3秒左右。



    和教员给的数据进行比较
    教员给的是Cipher.txt
    自己得到的是result.txt

    得到的结果完全相同,说明我的程序是正确的。

    补充说明

    当加密文件很短的时候,整个程序运行的时间很短,所以在程序中使用了两种方式来进行计时,但是还是会遇到两者相减为0的情况


    不过这个只是在加密明文很短的情况下,就是教员给的第一个样例是这样的,但是第二份样例中不是这样的。
    不过,当需要加密的内容很长的时候,需要的时间也是很长的,比如教员给的第二份样例,处理时间就很长,大概有

    代码

    使用方法

    参数:
    -E result.txt message.txt key.txt
    (命令行输入)

    程序在release文件夹中
    程序在选择CBC模式的时候读取iv.txt(程序内写死的)
    输出文件在release文件夹的result里面

    注意:
    在cmd中运行的时候,要进入当前文件夹,不然可能文件不能打开

    主文件

    #include <fstream>
    #include <iostream>
    #include <iomanip>
    #include "AES.h"
    #include <time.h>
    #include <windows.h>
    using namespace std;
    
    int main(int argc, char* argv[])
    {
        clock_t start, finish;
        DWORD startt, finisht;
    
        //命令行参数输入提醒
        const string USAGE = "Usage:    AES [-E | -D] destinationfile sourcefile keyfile ";
    
        //参数个数判断,并给出相应提示
        if (argc != 5)
        {
            cout << USAGE << endl;
            return 1;
        }
        const unsigned char zero[16] = { 0 };
    
        //在明文文件末尾加上16个0
        ofstream is1(argv[3],ios::app);
        if (!is1)
        {
            cerr << "InputFileNotFoundException" << endl;
            return 2;
        }
    
        is1.write((char*)zero, 16);
        is1.close();
    
        ifstream is(argv[3], ios::in | ios::binary|ios::app);
        if (!is)
        {
            cerr << "InputFileNotFoundException" << endl;
            return 2;
        }
    
        ifstream ks(argv[4], ios::in | ios::binary);
        if (!ks)
        {
            cerr << "KeyFileNotFoundException" << endl;
            return 2;
        }
    
        //创建类
        AES aes;
    
        //读密钥
        const unsigned char *key = new unsigned char[16];
        ks.read((char*)key, 16);
    
        //读明文
        ofstream os;
        os.open(argv[2], ios::out | ios::binary|ios::trunc);
    
        //模式选择
        int mode = 0;
        cout << "please choose mode: " << endl;
        cin >> mode;
        const unsigned char* cipherText = new unsigned char[16];
        unsigned char * lastcipher = new unsigned char[16];
        if (strcmp(argv[1], "-E") == 0 || strcmp(argv[1], "-e") == 0)
        {
            //ECB加密过程
            if (mode == 1) //ECB
            {
                const unsigned char* plainText = new unsigned char[16];
                //        memset((unsigned char*)plainText, 0, sizeof(plainText));
    
                //开始计时
                start = clock();
                startt = GetTickCount();
                while (is.read((char*)plainText, 16))
                {
                    //按块读取,并且判断是否是有效数据
                    if (!strcmp((char*)plainText, (char*)zero))
                    {
                        break;
                    }
                    //加密,将当前组的密文暂时存起来
                    cipherText = aes.Cipher(plainText, key, 16);
                    //将每一块的密文写入文件
                    os.write((char*)cipherText, 16);
                    if (!os.is_open())
                    {
                        cout << "Error" << endl;
                    }
                    memset((unsigned char*)plainText, 0, sizeof(plainText));
                }
    
                //计时结束
                finish = clock();
                finisht = GetTickCount();
            }
            //CBC模式
            else if (mode == 2)
            {
                //需要判断是不是以第一组加密,用first变量判断
                //
                const unsigned char* plainText = new unsigned char[16];
                const unsigned char* iv = new unsigned char[16];
                unsigned char *temp = new unsigned char[16];
                bool first = true;
                ifstream ivstream;
    
                //读取初始化向量
                ivstream.open("iv.txt", ios::in);
                ivstream.read((char*)iv, 16);
                memset((unsigned char*)plainText, 0, sizeof(plainText));
    
                //计时开始
                start = clock();
                startt = GetTickCount();
    
                //对于每一块进行加密
                while (is.read((char*)temp, 16))
                {
                    //判断是否是有效数据
                    if (!strcmp((char*)temp, (char*)zero))
                    {
                        break;
                    }
                    //第一组加密,要异或上初始化向量
                    if (first)
                    {
                        for (int i = 0; i < 16; i++)
                        {
                            temp[i] = temp[i] ^ iv[i];
                        }
                        first = false;
                    }
                    else
                    {
                        //以后每一组异或上一组得到的密文
    
                        for (int i = 0; i < 16; i++)
                        {
                            temp[i] = temp[i] ^ lastcipher[i];
                        }
    
                    }
                    plainText = temp;
                    cipherText = aes.Cipher(plainText, key, 16);
                    lastcipher = (unsigned char *)cipherText;
                    os.write((char*)cipherText,16);
                    if (!os.is_open())
                    {
                        cout << "Error" << endl;
                    }
                    //计时结束
                    finish = clock();
                    finisht = GetTickCount();
                }
    
            }
        }
        delete[] key;
    
        //输出最后一组的密文
        for (int i = 0; i < 16; i++)
        {
            cout << cipherText[i];
        }
        cout << endl;
    
        //文件关闭
        is.close();
        ks.close();
        os.close();
    
        //计算时间
        cout << "
    Time: " << ( finish - start ) << endl;
        cout << "
    Time: " << (finisht - startt) << endl;
    
        system("pause");
        return 0;
    }

    头文件

        #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();
        }
    
        void AES::DecryptionProcess()
        {    //    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_ */
    
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  • 原文地址:https://www.cnblogs.com/volva/p/11815079.html
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