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AES文件加密解密

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AES文件加密解密

[C/C++]代码

// AESstr.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "AESstr.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// The one and only application object

CWinApp theApp;

using namespace std;
#define Bits128    16  
#define Bits192    24  
#define Bits256    32  

static unsigned char AesSbox[16*16]=  
{// populate the Sbox matrix  
    /* 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  
};  

static unsigned char AesiSbox[16*16]=  
{  
    // populate the iSbox matrix  
    /* 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  
};  
static unsigned char AesRcon[11*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  
};  

    unsigned char State[4][4];  
    void Cipher(unsigned char* input, unsigned char* output);  // encipher 16-bit input  
    void InvCipher(unsigned char* input, unsigned char* output);  // decipher 16-bit input  
    int Nb;         // block size in 32-bit words.  Always 4 for AES.  (128 bits).  
    int Nk;         // key size in 32-bit words.  4, 6, 8.  (128, 192, 256 bits).  
    int Nr;         // number of rounds. 10, 12, 14.  

    unsigned char key[32];
    unsigned char w[16*15];

void SetNbNkNr(int keySize)  
{  
    Nb=4;  
    if(keySize=Bits128)  
    {  
        Nk=4;    //4*4字节,128位密钥,10轮加密  
        Nr=10;  
    }  
    else if(keySize=Bits192)  
    {  
        Nk=6;    //6*4字节,192位密钥,12轮加密  
        Nr=12;  
    }  
    else if(keySize=Bits256)  
    {  
        Nk=8;    //8*4字节,256位密钥,14轮加密  
        Nr=14;  
    }  
}  
////////////////////////////////////////////////////////////////////////////////////////////////  
//密钥移位函数  
unsigned char* RotWord(unsigned char* word)  
{  
    byte* temp = new byte[4];  
    temp[0] = word[1];  
    temp[1] = word[2];  
    temp[2] = word[3];  
    temp[3] = word[0];  
    return temp;  
}  
////////////////////////////////////////////////////////////////////////////////////////////////  
//密钥字代换函数  
unsigned char* SubWord(unsigned char* word)  
{  
    byte* temp = new byte[4];  
    for(int j=0;j<4;j++)  
    {  
        temp[j] = AesSbox[16*(word[j] >> 4)+(word[j] & 0x0f)];  //实际上也可以写成AesSbox[[j]];因为两者相等  
    }  
    return temp;  

}  
////////////////////////////////////////////////////////////////////////////////////////////////  
void KeyExpansion()  
{  
    int row;  
    memset(w,0,16*15);  
    for(row=0;row<Nk;row++)       //拷贝seed 密钥  
    {  
        w[4*row+0] =  key[4*row];  
        w[4*row+1] =  key[4*row+1];  
        w[4*row+2] =  key[4*row+2];  
        w[4*row+3] =  key[4*row+3];  
    }  
    byte* temp = new byte[4];  
    for(row=Nk;row<4*(Nr+1);row++)  
    {  
        temp[0]=w[4*row-4];     //当前列的前一列  
        temp[1]=w[4*row-3];  
        temp[2]=w[4*row-2];  
        temp[3]=w[4*row-1];  
        if(row%Nk==0)           //逢nk时,对当前列的前一列作特殊处理  
        {  
            temp=SubWord(RotWord(temp));   //先移位,再代换,最后和轮常量异或  
            temp[0] = (byte)( (int)temp[0] ^ (int) AesRcon[4*(row/Nk)+0] );  
            temp[1] = (byte)( (int)temp[1] ^ (int) AesRcon[4*(row/Nk)+1] );  
            temp[2] = (byte)( (int)temp[2] ^ (int) AesRcon[4*(row/Nk)+2] );  
            temp[3] = (byte)( (int)temp[3] ^ (int) AesRcon[4*(row/Nk)+3] );  
        }  
        else if ( Nk > 6 && (row % Nk == 4) )  //这个还没有搞清楚  
        {  
            temp = SubWord(temp);  
        }  

        // w[row] = w[row-Nk] xor temp  
        w[4*row+0] = (byte) ( (int) w[4*(row-Nk)+0] ^ (int)temp[0] );  
        w[4*row+1] = (byte) ( (int) w[4*(row-Nk)+1] ^ (int)temp[1] );  
        w[4*row+2] = (byte) ( (int) w[4*(row-Nk)+2] ^ (int)temp[2] );  
        w[4*row+3] = (byte) ( (int) w[4*(row-Nk)+3] ^ (int)temp[3] );  
    }  // for loop  

}  
////////////////////////////////////////////////////////////////////////////////////////////////  
//轮密钥加  
void AddRoundKey(int round)  
{  
    int i,j;  //i行 j列           //因为密钥w是一列一列排列的,即 k0 k4 k8 k12  
    for(j=0;j<4;j++)              //                              k1 k5 k9 k13  
    {                              //                              k2 k6 k10k14  
        for(i=0;i<4;i++)          //                              k3 k7 k11k15  
        {                          // 所以i行j列的下标是4*((round*4)+j)+i即16*round+4*j+i  
            State[i][j]=(unsigned char)((int)State[i][j]^(int)w[4*((round*4)+j)+i]);  
        }  
    }  
}  
////////////////////////////////////////////////////////////////////////////////////////////////  
//字节代换函数  
void SubBytes()                              //Page 103  
{  
    int i,j;  
    for(j=0;j<4;j++)  
    {  
        for(i=0;i<4;i++)  
        {  
            State[i][j]=AesSbox[State[i][j]];  
            //因为 16*(State[i][j]>>4)+State[i][j]&0x0f=State[i][j]  

        }  
    }  
}  
////////////////////////////////////////////////////////////////////////////////////////////////  
void ShiftRows()  
{  
    unsigned char temp[4*4];                                        //Page105  
    int i,j;  
    for(j=0;j<4;j++)  
    {  
        for(i=0;i<4;i++)  
        {  
            temp[4*i+j]=State[i][j];  
        }  
    }  
    for(i=1;i<4;i++)  
    {  
        for(j=0;j<4;j++)  
        {  
            if(i==1)State[i][j]=temp[4*i+(j+1)%4];                    //第一行左移1位  
            else if(i==2)State[i][j]=temp[4*i+(j+2)%4];                //第二行左移2位  
            else if(i==3)State[i][j]=temp[4*i+(j+3)%4];                //第三行左移3位  
        }  
    }  

}  
////////////////////////////////////////////////////////////////////////////////////////////////  
unsigned char gfmultby01(unsigned char b)  
{  
    return b;  
}  
unsigned char gfmultby02(unsigned char b)  
{  
    if (b < 0x80)  
        return (unsigned char)(int)(b <<1);  
    else  
        return (unsigned char)( (int)(b << 1) ^ (int)(0x1b) );  
}  

unsigned char gfmultby03(unsigned char b)  
{  
    return (unsigned char) ( (int)gfmultby02(b) ^ (int)b );  
}  

unsigned char gfmultby09(unsigned char b)  
{  
    return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^ (int)b );  
}  

unsigned char gfmultby0b(unsigned char b)  
{  
    return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^  
        (int)gfmultby02(b) ^ (int)b );  
}  

unsigned char gfmultby0d(unsigned char b)  
{  
    return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^  
        (int)gfmultby02(gfmultby02(b)) ^ (int)(b) );  
}  

unsigned char gfmultby0e(unsigned char b)  
{  
    return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^  
        (int)gfmultby02(gfmultby02(b)) ^(int)gfmultby02(b) );  
} 
////////////////////////////////////////////////////////////////////////////////////////////////  
void MixColumns()  
{  
    unsigned char temp[4*4];  
    int i,j;  
    for(j=0;j<4;j++)                                    //2 3 1 1  列混淆矩阵  Page107  
    {                                                    //1 2 3 1  
        for(i=0;i<4;i++)                                //1 1 2 3  
        {                                                //3 1 1 2  
            temp[4*i+j]=State[i][j];  
        }  
    }  
    for(j=0;j<4;j++)  
    {  
        State[0][j] = (unsigned char) ( (int)gfmultby02(temp[0+j]) ^ (int)gfmultby03(temp[4*1+j]) ^  
            (int)gfmultby01(temp[4*2+j]) ^ (int)gfmultby01(temp[4*3+j]) );  
        State[1][j] = (unsigned char) ( (int)gfmultby01(temp[0+j]) ^ (int)gfmultby02(temp[4*1+j]) ^  
            (int)gfmultby03(temp[4*2+j]) ^ (int)gfmultby01(temp[4*3+j]) );  
        State[2][j] = (unsigned char) ( (int)gfmultby01(temp[0+j]) ^ (int)gfmultby01(temp[4*1+j]) ^  
            (int)gfmultby02(temp[4*2+j]) ^ (int)gfmultby03(temp[4*3+j]) );  
        State[3][j] = (unsigned char) ( (int)gfmultby03(temp[0+j]) ^ (int)gfmultby01(temp[4*1+j]) ^  
            (int)gfmultby01(temp[4*2+j]) ^ (int)gfmultby02(temp[4*3+j]) );  
    }  

}  
////////////////////////////////////////////////////////////////////////////////////////////////  
//Aes加密函数  
void Cipher(unsigned char* input, unsigned char* output)  
{  
    int i;  
    memset(&State[0][0],0,16);  
    for(i=0;i<4*Nb;i++)                        //这里是先写列后写行的,即输入是一列一列的进来的  
    {  
        State[i%4][i/4]=input[i];                    //换成先写行后写列也是可以的,只要在输出时也是这样就可以了  
    }  
    AddRoundKey(0);                                    //轮密钥加  

    for (int round = 1; round <= (Nr - 1); round++)  // main round loop  
    {  
        SubBytes();                                    //字节代换  
        ShiftRows();                                //行移位  
        MixColumns();                                //列混淆  
        AddRoundKey(round);                            //轮密钥加  
    }  // main round loop  

    SubBytes();                                        //字节代换  
    ShiftRows();                                    //行移位  
    AddRoundKey(Nr);                                //轮密钥加  

    // output = state  
    for (i = 0; i < (4 * Nb); i++)  
    {  
        output[i] =  State[i % 4][ i / 4];  
    }  

}  
void InvShiftRows()  
{  
    unsigned char temp[4*4];  
    int i,j;  
    for(j=0;j<4;j++)  
    {  
        for(i=0;i<4;i++)  
        {  
            temp[4*i+j]=State[i][j];  
        }  
    }  
    for(i=1;i<4;i++)  
    {  
        for(j=0;j<4;j++)  
        {  
            //if(i==1)State[i][j]=temp[4*i+(j-1)%4];    在此犯了一个错误 -1%4=-1 而不是3,所以采用了下面再加一个4的做法  
            if(i==1)State[i][j]=temp[4*i+(j+3)%4];            //第一行右移1位 j-1+4=j+3  
            else if(i==2)State[i][j]=temp[4*i+(j+2)%4];        //第二行右移2位 j-2+4=j+2  
            else if(i==3)State[i][j]=temp[4*i+(j+1)%4];        //第三行右移3位 j-3+4=j+2  
        }  
    }  
}  
void InvSubBytes()  
{  
    int i,j;  
    for(j=0;j<4;j++)  
    {  
        for(i=0;i<4;i++)  
        {  
            State[i][j]=AesiSbox[State[i][j]]; //因为 16*(State[i][j]>>4)+State[i][j]&0x0f=State[i][j]  
        }  
    }  
}  
void InvMixColumns()  
{  
    unsigned char temp[4*4];  
    int i,j;  
    for (i = 0; i < 4; i++)  // copy State into temp[]  
    {  
        for (j = 0; j < 4; j++)                         //0e 0b 0d 09   逆变换矩阵 Page108  
        {                                                //09 0e 0b 0d  
            temp[4*i+j] =  State[i][j];                    //0d 09 0e 0b  
        }                                                //0b 0d 09 0e  
    }  

    for (j = 0; j < 4; j++)  
    {  
        State[0][j] = (unsigned char) ( (int)gfmultby0e(temp[j]) ^ (int)gfmultby0b(temp[4+j]) ^  
            (int)gfmultby0d(temp[4*2+j]) ^ (int)gfmultby09(temp[4*3+j]) );  
        State[1][j] = (unsigned char) ( (int)gfmultby09(temp[j]) ^ (int)gfmultby0e(temp[4+j]) ^  
            (int)gfmultby0b(temp[4*2+j]) ^ (int)gfmultby0d(temp[4*3+j]) );  
        State[2][j] = (unsigned char) ( (int)gfmultby0d(temp[j]) ^ (int)gfmultby09(temp[4+j]) ^  
            (int)gfmultby0e(temp[4*2+j]) ^ (int)gfmultby0b(temp[4*3+j]) );  
        State[3][j] = (unsigned char) ( (int)gfmultby0b(temp[j]) ^ (int)gfmultby0d(temp[4+j]) ^  
            (int)gfmultby09(temp[4*2+j]) ^ (int)gfmultby0e(temp[4*3+j]) );  
    }  
}  
////////////////////////////////////////////////////////////////////////////////////////////////  
//Aes解密函数  
void InvCipher(unsigned char* input,unsigned char* output)  
{  
    int i;  
    memset(&State[0][0],0,16);  
    for (i = 0; i < (4 * Nb); i++)  
    {  
        State[i % 4][ i / 4] = input[i];  
    }  

    AddRoundKey(Nr);  

    for (int round = Nr-1; round >= 1; round--)  // main round loop  
    {  
        InvShiftRows();  
        InvSubBytes();  
        AddRoundKey(round);  
        InvMixColumns();  
    }  // end main round loop for InvCipher  

    InvShiftRows();  
    InvSubBytes();  
    AddRoundKey(0);  

    // output = state  
    for (i = 0; i < (4 * Nb); i++)  
    {  
        output[i] =  State[i % 4][ i / 4];  
    }  
}  
int FileCrypt()  
{  
    //CreateFile获得文件内核句柄  
    DWORD FileSize;  
    HANDLE hFile = CreateFile("D:\\1.txt", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);  
    if (hFile == INVALID_HANDLE_VALUE)  
    {  
        printf("无效的句柄,尝试重新打开\n");  
    }  

    //获取文件大小  
    FileSize = GetFileSize(hFile, NULL);  
    if (FileSize == INVALID_FILE_SIZE)  
    {  
        printf("获取文件大小出错,请重新尝试\n");  
    }  

    //动态分配待加密字符串  
    char * Buff1 = (char*) malloc(sizeof(char) * FileSize);  
    memset(Buff1, 0, sizeof(Buff1));  
    BOOL b;  
    DWORD dwSizeOfRead = 0;  
    b = ReadFile(hFile, Buff1, FileSize, &dwSizeOfRead, NULL);  

    //读取文件内容  
    if ((dwSizeOfRead != FileSize) || (!b))  
    {  
        printf("读取文件出错\n");  
    }  

    //字符串补位操作  
    int add;  
    if (FileSize / 16 == 0)  
        add = 16;  
    else  
        add = 16 - FileSize % 16;  

    //动态分配补位后待加密字符串  
    char * Buff2 = (char*) malloc(sizeof(char) * (FileSize + add));  
    memset(Buff2, 0, sizeof(Buff2));  
    //进行补齐  
    for(int i = 0; i < FileSize + add; i++)  
    {  
        if(i < FileSize)  
            Buff2[i] = Buff1[i];  
        else  
            Buff2[i] = (char)add;  
    }  

    //加密操作  
    unsigned char* keyBytes=(unsigned char*)"1234567812345678";
    SetNbNkNr(16);                         //设置密钥块数,轮数  
    memcpy(key,keyBytes,16);                //字符串拷贝函数,把keyBytes的keysize个字符复制到key中  
    KeyExpansion();                                //密钥扩展,必须提前做的初始化  

    //将缓存区里面的数据加密,放入新的缓存区里面  
    HANDLE hNewFile = CreateFile("D:\\1(加密).txt", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);  
    DWORD count = 0;  
    char Temp1[16];  
    char Temp2[16];  
    while (count <= FileSize)  
    {  
        memset(Temp1, 0 ,sizeof(Temp1));  
        memset(Temp2, 0, sizeof(Temp2));  
        for (int i = 0; i <16; i++)  
            Temp1[i] = Buff2[i + count];  
        Cipher((unsigned char*)Temp1, (unsigned char*)Temp2);  
        //将新缓存区的数据写入新的文件里面  
        DWORD dwSizeOfWrite = 0;  
        WriteFile(hNewFile, Temp2, sizeof(Temp2), &dwSizeOfWrite, 0);  
        SetFilePointer(hNewFile, 0, NULL, FILE_END);  
        count +=16;  
    }  
    FlushFileBuffers(hNewFile);
    CloseHandle(hFile);  
    CloseHandle(hNewFile);  
    return 0;  
}  

int FileDeCrypt()  
{  
    //CreateFile获得文件内核句柄  
    DWORD FileSize;  
    HANDLE hFile = CreateFile("D:\\1(加密).txt", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);  
    if (hFile == INVALID_HANDLE_VALUE)  
    {  
        printf("无效的句柄,尝试重新打开\n");  
    }  

    //获取文件大小  
    FileSize = GetFileSize(hFile, NULL);  
    if (FileSize == INVALID_FILE_SIZE)  
    {  
        printf("获取文件大小出错,请重新尝试\n");  
        return 1;  
    }  
    if (FileSize % 16 != 0)  
    {  
        printf("加密文件大小有误,请检查加密文件");  
        return 1;  
    }  

    //动态分配内存  
    char* Buff1 = (char*)malloc(sizeof(char) * FileSize);  
    char* Buff2 = (char*)malloc(sizeof(char) * FileSize);  
    BOOL b;  
    DWORD dwSizeOfRead = 0;  
    b = ReadFile(hFile, Buff1, FileSize, &dwSizeOfRead, NULL);  
    //读取文件内容  
    if ((dwSizeOfRead != FileSize) || (!b))  
    {  
        printf("读取文件出错\n");  
        return 1;  
    }  
    //解密操作  
    unsigned char* keyBytes=(unsigned char*)"1234567812345678"; 
    SetNbNkNr(16);                         //设置密钥块数,轮数  
    memcpy(key,keyBytes,16);                //字符串拷贝函数,把keyBytes的keysize个字符复制到key中  
    KeyExpansion();                                //密钥扩展,必须提前做的初始化  

    //将缓存区里面的数据加密,放入新的缓存区里面  
    HANDLE hNewFile = CreateFile("D:\\1(解密).txt", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);  
    DWORD count = 0;  
    char Temp1[16];  
    char Temp2[16];  
    for (int j = 0; j < FileSize / 16; j++)  
    {  
        memset(Temp1, 0 ,sizeof(Temp1));  
        memset(Temp2, 0, sizeof(Temp2));  
        for (int i = 0; i <16; i++)  
            Temp1[i] = Buff1[i + count];  
        InvCipher((unsigned char*)Temp1, (unsigned char*)Temp2);  
        if (j == FileSize / 16 - 1) //最后一次写文件  
        {  
            int add = (int)Temp2[15];//获得最后一次要写入的16-add个字节  
            DWORD dwSizeOfWrite = 0;  
            WriteFile(hNewFile, Temp2, sizeof(char) * (16 - add), &dwSizeOfWrite, 0);  
            SetFilePointer(hNewFile, 0, NULL, FILE_END);  
        }  
        else  
        {  
            //将新缓存区的数据写入新的文件里面  
            DWORD dwSizeOfWrite = 0;  
            WriteFile(hNewFile, Temp2, sizeof(Temp2), &dwSizeOfWrite, 0);  
            SetFilePointer(hNewFile, 0, NULL, FILE_END);  
            count +=16;  
        }  
    }  
    FlushFileBuffers(hNewFile);
    CloseHandle(hFile);  
    CloseHandle(hNewFile);  
    return 0;  
}

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
    int nRetCode = 0;

    // initialize MFC and print and error on failure
    if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
    {
        // TODO: change error code to suit your needs
        cerr << _T("Fatal Error: MFC initialization failed") << endl;
        nRetCode = 1;
    }
    else
    {
        FileCrypt();
        FileDeCrypt();
    }

    return nRetCode;
}

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