aes加密解密 crypto实现

   因为课程需要，我们要做一个aes的加密解密的小程序，其中核心部分我选择了crypto，但是这个的api又少又难懂，不过还是勉强写完了，

   其中包括了cbc，ecb两种连接方式的实现，支持128，192，256位密钥，明文长度不限，填充采用的是标准的（pkcs#5标准）如果明文最后一部分不满16个字节，缺4个字节，那么我在最后4个字节将会填入04,04,04,04，所以我的明文最后的数字范围从（1-16），这个特性将会影响我加密出来的最终结果，这时要特别注意的，

  

代码如下

 

#include <iostream>
using namespace std; 
#include <aes.h>
#include <modes.h>
#include <string>
#include <fstream>
using namespace std;
using namespace CryptoPP;
#pragma comment( lib, "cryptlib.lib" )
void AESBasicEncrypt(string input,string key,string output);
void AESBasicDecrypt(string input,string key,string output);
void AESCBCEncrypt(string input,string key,string iv,string output);
void AESCBCDecrypt(string input,string key,string iv,string output);
void  XorCharArray(unsigned char *a,unsigned char * b,int length);
int main(int argc,char *argv[])
{
  if(argc<2){
   cout<< "the parameters has some error"<<endl;
   system("pause");
   return 1;
  }
        //AES中使用的固定参数是以类AES中定义的enum数据类型出现的，而不是成员函数或变量
        //因此需要用::符号来索引
  string aes="AES";
  string ECB="ECB";
  string InvAES="InvAES";
  string CBC="CBC";
  string InvCBC="InvCBC";
  string InvECB="InvECB";
        cout << "AES Parameters: " << endl;
        cout << "Algorithm name : " << AES::StaticAlgorithmName() << endl;      
  cout << "Algorithm Type : " << argv[1] << endl;      
  if((argv[1]==aes||argv[1]==ECB)&&argc>=5){
   cout << "Algorithm InputText : " << argv[2] << endl;      
   cout << "Algorithm InputKey : " << argv[3] << endl;      
   cout << "Algorithm OutputText  : " << argv[4] << endl;  
   cout << "Block size     : " << AES::BLOCKSIZE * 8 << endl;
   AESBasicEncrypt(argv[2],argv[3],argv[4]);
   system("pause");
   return 0;
  }
  if(argv[1]==CBC&&argc>=6){
   cout << "Algorithm InputText : " << argv[2] << endl;      
   cout << "Algorithm InputKey : " << argv[3] << endl;     
   cout << "Algorithm IV : " << argv[4] << endl; 
   cout << "Algorithm OutputText  : " << argv[5] << endl;  
   cout << "Block size     : " << AES::BLOCKSIZE * 8 << endl;
   AESCBCEncrypt(argv[2],argv[3],argv[4],argv[5]);
   system("pause");
   return 0;
  }
  if(argv[1]==InvCBC&&argc>=6){
   cout << "Algorithm InputText : " << argv[2] << endl;      
   cout << "Algorithm InputKey : " << argv[3] << endl;     
   cout << "Algorithm IV : " << argv[4] << endl; 
   cout << "Algorithm OutputText  : " << argv[5] << endl;  
   cout << "Block size     : " << AES::BLOCKSIZE * 8 << endl;
   AESCBCDecrypt(argv[2],argv[3],argv[4],argv[5]);
   system("pause");
   return 0;
  }
  if((argv[1]==InvAES||argv[1]==InvECB)&&argc>=5){
   cout << "Algorithm InputText : " << argv[2] << endl;      
   cout << "Algorithm InputKey : " << argv[3] << endl;      
   cout << "Algorithm OutputText  : " << argv[4] << endl; 
   cout << "Block size     : " << AES::BLOCKSIZE * 8 << endl;
   AESBasicDecrypt(argv[2],argv[3],argv[4]);
   system("pause");
   return 0;
  }    
  cout<< "the parameters has some error"<<endl;
       
        
       
    
  system("pause");
        return 0;
}
void AESBasicEncrypt(string input,string key,string output){
 ifstream inputTextF;
 ifstream inputKeyF;
 ofstream outputF(output.c_str(),ofstream::binary);
 inputTextF.open(input.c_str(),ifstream::binary);
 AESEncryption aesEncryptor;
 char aesKey[32]={0};
 unsigned char aesKey2[32]={0};
 unsigned char aesText2[16]={0};
 char inputT[16]={0}; 
 unsigned char outBlock[AES::BLOCKSIZE]={0};                                
    unsigned char xorBlock[AES::BLOCKSIZE];                                 
    memset( xorBlock, 0, AES::BLOCKSIZE );                                  
 if(!inputTextF){
  cout<< "the "+input+" not found or error"<<endl;
  return ;
 }
 inputKeyF.open(key.c_str(),ifstream::binary); 
 if(!inputKeyF){
 cout<< "the "+key+" not found or error"<<endl;
  return ;
 }
 inputKeyF.read(aesKey,32);
 int  end_pos,endNum=0;   
    end_pos = inputKeyF.gcount(); 
 memcpy(aesKey2,aesKey,end_pos); 


 aesEncryptor.SetKey(aesKey2, end_pos );  
 cout << "key length : " << end_pos * 8 << endl;
     
 cout << "output encryption Text     : " << endl;
 while(!inputTextF.eof())
 { memset( inputT, 0, AES::BLOCKSIZE );
  inputTextF.read(inputT,16);
  endNum=inputTextF.gcount();
  if(endNum<16){
   for(int i=endNum;i<16;i++){
    inputT[i]=16-endNum;
   }
  }
  memcpy(aesText2,inputT,16);
  
  aesEncryptor.ProcessAndXorBlock( aesText2, xorBlock, outBlock );  
  
  for( int i=0; i<16; i++ ) {
   outputF<<outBlock[i];
  
                cout << hex << (int)outBlock[i] << " ";


 }
  outputF.flush();
 }
 inputTextF.close();
  inputTextF.clear();
  inputKeyF.close();
  inputKeyF.clear();
  outputF.close();
  outputF.clear();
 cout << endl;
}
void AESCBCEncrypt(string input,string key,string iv,string output){
 ifstream inputTextF;
 ifstream inputKeyF;
 ifstream ivF;
 ofstream outputF(output.c_str(),ofstream::binary);
 AESEncryption aesEncryptor;
 char aesKey[32]={0};
 unsigned char aesKey2[32]={0};
 char inputT[16]={0};
 unsigned char aesText2[16]={0};  
 unsigned char outBlock[AES::BLOCKSIZE]={0};                                
 char ivArray[16]={0};
 unsigned char ivArrayU[16]={0};
 unsigned char xorBlock[AES::BLOCKSIZE];                                 
    int end_pos=0,endNum=0;
 memset( xorBlock, 0, AES::BLOCKSIZE );                                  
 

 inputKeyF.open(key.c_str(),ifstream::binary); 
 if(!inputKeyF){
  cout<< "the "+key+" not found or error"<<endl;
       
  return ;
 }
 inputKeyF.read(aesKey,32);   
 end_pos = inputKeyF.gcount(); 
 memcpy(aesKey2,aesKey,end_pos); 
 aesEncryptor.SetKey(aesKey2, end_pos );  
 cout << " key length : " << end_pos * 8 << endl;
     
 ivF.open(iv.c_str(),ifstream::binary); 
 if(!ivF){
  cout<< "the "+iv+" not found or error"<<endl;
       
  return ;
 }
 ivF.read(ivArray,16);
 memcpy(ivArrayU,ivArray,16);
 ivF.close();

 inputTextF.open(input.c_str(),ifstream::binary); 
 if(!inputTextF){
  cout<< "the "+input+" not found or error"<<endl;
       
  return ;
 }
 cout << "output encryption Text     : " << endl;
 
 while(!inputTextF.eof())
 { memset( inputT, 0, AES::BLOCKSIZE );
  inputTextF.read(inputT,16);
  endNum=inputTextF.gcount();
  if(endNum<16){
   for(int i=endNum;i<16;i++){
    inputT[i]=16-endNum;
   }
  }
  memcpy(aesText2,inputT,16);
  XorCharArray(aesText2,ivArrayU,16);
  aesEncryptor.ProcessAndXorBlock( aesText2, xorBlock, outBlock );  
  memcpy(ivArrayU,outBlock,16);
  for( int i=0; i<16; i++ ) {
   outputF<<outBlock[i];
  
                cout << hex << (int)outBlock[i] << " ";


 }
  outputF.flush();
 }
 inputTextF.close();
  inputTextF.clear();
  inputKeyF.close();
  inputKeyF.clear();
  outputF.close();
  outputF.clear();
 cout << endl;
}
void AESCBCDecrypt(string input,string key,string iv,string output)
{
 ifstream inputTextF;
 ifstream inputKeyF;
 ifstream ivF;
 ofstream outputF(output.c_str(),ofstream::binary);
 inputTextF.open(input.c_str(),ifstream::binary);
  AESDecryption aesDecryptor;
 char aesKey[32]={0};
 unsigned char aesKey2[32]={0};
 unsigned char aesText2[16]={0};
 char inputT[16]={0}; 
 unsigned char outBlock[AES::BLOCKSIZE]={0};                                
 char ivArray[16]={0};
 unsigned char ivArrayU[16]={0}; 
    unsigned char xorBlock[AES::BLOCKSIZE];                                 
    memset( xorBlock, 0, AES::BLOCKSIZE );                                  
 
       

 if(!inputTextF){
  cout<< "the "+input+" not found or error"<<endl;
  return ;
 }
 inputKeyF.open(key.c_str(),ifstream::binary); 
 if(!inputKeyF){
  cout<< "the "+key+" not found or error"<<endl;
  return ;
 }
 inputKeyF.read(aesKey,32);
 int  end_pos,endNum;   
    end_pos = inputKeyF.gcount(); 
 memcpy(aesKey2,aesKey,end_pos);  

 
 aesDecryptor.SetKey(aesKey2, end_pos );  //设定密钥
 cout << " key length : " << end_pos * 8 << endl;
   
    ivF.open(iv.c_str(),ifstream::binary); 
 if(!ivF){
  cout<< "the "+iv+" not found or error"<<endl;
  return ;
 }
 ivF.read(ivArray,16);
 memcpy(ivArrayU,ivArray,16);
 ivF.close();

 memset( inputT, 0, AES::BLOCKSIZE );


 cout << "output Decryption Text     : " << endl;
 
 while(inputTextF.peek()!=EOF)
 { inputTextF.read(inputT,16);
  endNum=16;
  memcpy(aesText2,inputT,16);  
  aesDecryptor.ProcessAndXorBlock( aesText2, xorBlock, outBlock );  
  XorCharArray(outBlock,ivArrayU,16);
  //memcpy(xorBlock,outBlock,16);
  memcpy(ivArrayU,aesText2,16);
  
  
  if(inputTextF.peek()==EOF){
   endNum=16-outBlock[15];
  }
  for( int i=0; i<endNum; i++ ) {
   outputF<<outBlock[i];
  
                cout << hex << (int)outBlock[i] << " ";


 }
  cout<<endl;
  outputF.flush();
  memset( inputT, 0, AES::BLOCKSIZE );
 }
 inputTextF.close();
  inputTextF.clear();
  inputKeyF.close();
  inputKeyF.clear();
  outputF.close();
  outputF.clear();
 cout << endl;
}
void AESBasicDecrypt(string input,string key,string output)
{
 ifstream inputTextF;
 ifstream inputKeyF;
 ofstream outputF(output.c_str(),ofstream::binary);
 inputTextF.open(input.c_str(),ifstream::binary);
  AESDecryption aesDecryptor;
 char aesKey[32]={0};
 unsigned char aesKey2[32]={0};
 unsigned char aesText2[16]={0};
 char inputT[16]={0}; 
 unsigned char outBlock[AES::BLOCKSIZE]={0};                                
    unsigned char xorBlock[AES::BLOCKSIZE];                                 
    memset( xorBlock, 0, AES::BLOCKSIZE );                                  
 
       

 if(!inputTextF){
  cout<< "the "+input+" not found or error"<<endl;
  return ;
 }
 inputKeyF.open(key.c_str(),ifstream::binary); 
 if(!inputKeyF){
  cout<< "the "+key+" not found or error"<<endl;
  
  return ;
 }
 inputKeyF.read(aesKey,32);
 int  end_pos,endNum;   
    end_pos = inputKeyF.gcount(); 
 memcpy(aesKey2,aesKey,end_pos);  

 
 aesDecryptor.SetKey(aesKey2, end_pos );  //设定加密密钥
 cout << " key length : " << end_pos * 8 << endl;
   
     
 memset( inputT, 0, AES::BLOCKSIZE );
 cout << "output Decryption Text     : " << endl;
 
 while(inputTextF.peek()!=EOF)
 { inputTextF.read(inputT,16);
  endNum=16;
  memcpy(aesText2,inputT,16); 

  aesDecryptor.ProcessAndXorBlock( aesText2, xorBlock, outBlock );  //加密
  if(inputTextF.peek()==EOF){
   endNum=16-outBlock[15];
  }
  for( int i=0; i<endNum; i++ ) {
   outputF<<outBlock[i];
  
                cout << hex << (int)outBlock[i] << " ";


 }
  cout<<endl;
  outputF.flush();
  memset( inputT, 0, AES::BLOCKSIZE );
 }
 inputTextF.close();
  inputTextF.clear();
  inputKeyF.close();
  inputKeyF.clear();
  outputF.close();
  outputF.clear();
 cout << endl;
}
void  XorCharArray(unsigned char *a,unsigned char * b,int length){
 for(int i=0;i<length;i++){
  a[i]=a[i]^b[i];
 }
}

 
 代码质量很低，大家随便看看，此外参考了网上一些例子，用法如下

AESCipher.exe CBC ice.txt   KeyFile.dat iv.dat outputCBC.dat 
AESCipher.exe InvCBC outputCBC.dat    KeyFile.dat iv.dat outputCBCP.dat 
AESCipher.exe AES ice.txt   KeyFile.dat outputAES.dat
AESCipher.exe InvAES outputAES.dat   KeyFile.dat outputAESP.dat
AESCipher.exe ECB ice.txt   KeyFile.dat outputECB.dat
AESCipher.exe InvECB outputECB.dat   KeyFile.dat outputECBP.dat

 

 ice.txt是原文,keyFile.dat是密钥，outputXXX.dat是密文，ouputXXXP.dat是解密后的原文，源代码附件AES.rar里面有，其中的cryptlib是我利用vs2010生成的crpyto的lib，还有个测试打包的，大家都可以拿去看看