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使用AES加密算法

来源:互联网 作者:佚名 时间:2015-10-09 06:14
上几天大概了解了一下AES 算法 ,具体的 加密 算法 现在不想很清楚的了解,只是能够拿来用就好了。这里有份c++的AES。 Aes.h #include Windows.h //enum KeySize { Bits128, Bits192, Bits256 }; // key size, in bits, for construtor #define Bits128 16 #
上几天大概了解了一下AES算法,具体的加密算法现在不想很清楚的了解,只是能够拿来用就好了。这里有份c++的AES。
 
Aes.h
 

#include <Windows.h> 
//enum KeySize { Bits128, Bits192, Bits256 };  // key size, in bits, for construtor 
#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 
}; 
 
class Aes  // Advanced Encryption Standard 

public: 
~Aes(); 
Aes(); 
Aes(int keySize, unsigned char* keyBytes); 
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 
private: 
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); 
void AddRoundKey(int round);      //轮密钥加 
void SubBytes();                  //S盒字节代换 
void InvSubBytes();               //逆S盒字节代换 
void ShiftRows();                 //行移位 
void InvShiftRows(); 
void MixColumns();                //列混淆 
void InvMixColumns(); 
unsigned char gfmultby01(unsigned char b); 
unsigned char gfmultby02(unsigned char b); 
unsigned char gfmultby03(unsigned char b); 
unsigned char gfmultby09(unsigned char b); 
unsigned char gfmultby0b(unsigned char b); 
unsigned char gfmultby0d(unsigned char b); 
unsigned char gfmultby0e(unsigned char b); 
void KeyExpansion();              //密钥扩展 
unsigned char* SubWord(unsigned char* word);         //密钥S盒字代换 
unsigned char* RotWord(unsigned char* word);         //密钥移位 
//Dump(); 
//DumpKey(); 
//    DumpTwoByTwo(char* a); 
}; 
 
 
然后是Aes.cpp文件
 
[cpp] view plaincopyprint?
//#include "StdAfx.h"    //注意在此#include "Aes.h"不可以放在前面,否则出错, 
#include "Aes.h" 
Aes::~Aes() 

 

Aes::Aes() 

 

//////////////////////////////////////////////////////////////////////////////////////////////// 
//构造函数 
Aes::Aes(int keysize,unsigned char* keyBytes) 

SetNbNkNr(keysize);                         //设置密钥块数,轮数 
memcpy(key,keyBytes,keysize);                //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 

//////////////////////////////////////////////////////////////////////////////////////////////// 
void Aes::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; 


//////////////////////////////////////////////////////////////////////////////////////////////// 
void Aes::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 
 

//////////////////////////////////////////////////////////////////////////////////////////////// 
//密钥移位函数 
unsigned char* Aes::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* Aes::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; 
 

//////////////////////////////////////////////////////////////////////////////////////////////// 
//Aes加密函数 
void Aes::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]; 

 

//////////////////////////////////////////////////////////////////////////////////////////////// 
//Aes解密函数 
void Aes::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]; 


//////////////////////////////////////////////////////////////////////////////////////////////// 
//轮密钥加 
void Aes::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 Aes::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 Aes::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 Aes::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 


 

void Aes::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 Aes::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]) ); 

 

void Aes::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]) ); 


//////////////////////////////////////////////////////////////////////////////////////////////// 
unsigned char Aes::gfmultby01(unsigned char b) 

return b; 

unsigned char Aes::gfmultby02(unsigned char b) 

if (b < 0x80) 
return (unsigned char)(int)(b <<1); 
else 
return (unsigned char)( (int)(b << 1) ^ (int)(0x1b) ); 

 
unsigned char Aes::gfmultby03(unsigned char b) 

return (unsigned char) ( (int)gfmultby02(b) ^ (int)b ); 

 
unsigned char Aes::gfmultby09(unsigned char b) 

return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^ (int)b ); 

 
unsigned char Aes::gfmultby0b(unsigned char b) 

return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^ 
(int)gfmultby02(b) ^ (int)b ); 

 
unsigned char Aes::gfmultby0d(unsigned char b) 

return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^ 
(int)gfmultby02(gfmultby02(b)) ^ (int)(b) ); 

 
unsigned char Aes::gfmultby0e(unsigned char b) 

return (unsigned char)( (int)gfmultby02(gfmultby02(gfmultby02(b))) ^ 
(int)gfmultby02(gfmultby02(b)) ^(int)gfmultby02(b) ); 

//////////////////////////////////////////////////////////////////////////////////////////////// 
 
 
这里想说下Aes加密需要注意的地方。我们上面代码的时候,首先要传入密钥。
Aes(int keySize, unsigned char* keyBytes);
 
密钥的长度可以是128位, 192位,256位。对应分别是16个字节,24个字节和32个字节。
 
然后在加密和解密的时候,我们传入两个指针。
 
void Cipher(unsigned char* input, unsigned char* output);  // encipher 16-bit input
void InvCipher(unsigned char* input, unsigned char* output);  // decipher 16-bit input
 
注意每次都是传16位的。也就是说,如果你的数据字节很大,你必须把数据拆开来,拆成16个字节16个字节的进行加密
 
这里就产生一个问题:如果我们的数据是17个字节,那该怎么办呢?
 
这里我百度了一下采用以下这个方法:
 
 
 
如果要加密的字符串不够16位,输入字符串就要补位,比方说:
源输入:
abcdefg
补位后:
abcdefg999999999
 
源输入:
123456789
补位后:
1234567897777777
 
也就是说差几个字节补几个字节,补的字节就是ascii值从1 到15。
 
下面自己写了个测试程序来测试AES加密。在D盘目录下建立一个1.txt文件。输入17个字节的数据。运行下面的程序:
[cpp] view plaincopyprint?
#include "Aes.h" 
#include <stdio.h> 
 
//对文件的AES加密操作 
int FileCrypt(); 
//对文件的AES解密操作  www.2cto.com
int FileDeCrypt(); 
 
int main() 

FileCrypt(); 
FileDeCrypt(); 
return 0; 

 
int FileCrypt() 

//CreateFile获得文件内核句柄 
DWORD FileSize; 
HANDLE hFile = CreateFile(L"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  www.2cto.com
Aes aes(16, (unsigned char *)"1234567812345678"); 
//将缓存区里面的数据加密,放入新的缓存区里面 
HANDLE hNewFile = CreateFile(L"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 <=15; i++) 
Temp1[i] = Buff2[i + count]; 
aes.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; 

CloseHandle(hFile); 
CloseHandle(hNewFile); 
return 0; 

 
int FileDeCrypt() 

//CreateFile获得文件内核句柄 
DWORD FileSize; 
HANDLE hFile = CreateFile(L"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 
Aes aes(16, (unsigned char *)"1234567812345678"); 
//将缓存区里面的数据加密,放入新的缓存区里面 
HANDLE hNewFile = CreateFile(L"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 <=15; i++) 
Temp1[i] = Buff1[i + count]; 
aes.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; 


 
CloseHandle(hFile); 
CloseHandle(hNewFile); 
return 0; 

 
  
 摘自 MiibotreeFun
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