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，

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代码如下

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#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]; }}

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?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.datAESCipher.exe InvAES outputAES.dat   KeyFile.dat outputAESP.datAESCipher.exe ECB ice.txt   KeyFile.dat outputECB.datAESCipher.exe InvECB outputECB.dat   KeyFile.dat outputECBP.dat

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?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